I.D. word for this list. Will contain 777778.
Sync bits. Will contain 773408.
CSM STATE VECTOR and TIME. The LGC's latest calculated
state vector for the CSM in reference coordinates. The
coordinates may be either earth-centered or moon-centered; a zero
in bit 12 of flagword 8 (CMOONFLG) indicates earth-centered, a one
indicates moon-centered. Words 2-4 contain the position
components X, Y, Z scaled meters/229. Words 5-7
contain the velocity components X, Y, Z scaled
(meters/centisecond)/27. Word 8 contains the time
associated with the state vector scaled centimeters/228,
referenced to the computer clock. The scaling for position,
velocity and time is the same whether earth-centered or
moon-centered.
TALIGN. Time to which a landing site or LM state vector is referenced for the landing site and nominal IMU alignment orientations during P52 and P57. Scaled centiseconds/228, referenced to computer clock.
POSTORKU. Running sum of positive torque commands about control axis U (RCS on-time multiplied by the number of jets used). POSTORKU will, in time, overflow and subsequently increase once more from zero (overflow does not go into sign bit). The scaling is such as to preclude more than one overflow per downlink cycle (2 sec) thus making the change from one reading to the next unambiguous. Calculated every 0.1 second when DAP is running. Scaled jetseconds/32 (1 jetsecond is defined as 1 jet firing for 1 second).
NEGTORKU. Running sum (always positive) of negative torque about control axis U. Calculated every 0.1 second when DAP is running. Scaled jetseconds/32.
POSTORKV. Running sum of positive torque about control axis V. Calculated every 0.1 second when DAP is running. Scaled jetseconds/32.
RR RANGE (Raw Data). Treated as a 15-bit integer which is multiplied by either 9.38 for the low scale or by 75.04 for the high scale to convert to units of feet. a 1 in bit 3 of RADMODES indicates high scale. See page 2-98 for more complete description.
RR RANGE RATE (Raw Data). Treated as a 15-bit
integer. To convert to units of feet per second the
following computation is done:
(15-bit integer - 17000) × (-0.6278)A negative quantity indicates closing.
TIME OF EVENT. Contains the image of TIME2, TIME1 at the
time of the last significant event. Loaded in burn programs
with time of ignition and time of engine cutoff as they
occur. Loaded with abort initiation time in P70 and
P71. Scaled centiseconds/228.
REFSMMAT. Six elements of REFSMMAT, in the order R1C1,
R1C2, R1C3, R2C1,
R2C2, R2C3.
REFSMMAT is the 3 × 3 matrix used to convert from reference to
stable member coordinates. The remaining three components of
REFSMMAT may be computed as follows:
R3C1 = (R1C2) (R2C3) - (R1C3) (R2C2)
R3C2 = (R1C3) (R2C1) - (R1C1) (R2C3)
R3C3 = (R1C1) (R2C2) - (R1C2) (R2C1)
where R = Row and C = Column.
Calculated at the end of P51, prior to IMU coarse align in P52
for alignment options 1, 2 and 4, and in P57 for alignment
techniques 1 and 4. Each row is a half-unit vector.
AOT CODE. Bits 6-1 contain the octal identification number
of the celestial body being sighted.
Bits 9-7 contain the Detent Code as follows:
| 0 |
Optical System Calibration Code
|
Valid only in R52 |
|
| 1 |
is AOT Position 1 (left forward) |
AZ = -60° | EL = 45° |
| 2 |
is AOT Position 2 (forward) |
AZ = 0° | EL = 45° |
| 3 |
is AOT Position 3 (right forward) |
AZ = 60° | EL = 45° |
| 4 |
is AOT Position 4 (right rear) |
AZ = 120° | EL = 45° |
| 5 |
is AOT Position 5 (rear) |
AZ = 180° | EL = 45° |
| 6 |
is AOT Position 6 (left rear) |
AZ = -120° | EL = 45° |
| 7 |
Crew Optical Alignment Sight |
||
AOT CODE is the erasable storage for Display Nouns 70 and 71 in the routines AOTMARK (R53), Auto Optics Positioning (R52), and Star Acquisition (R59). AOTCODE is always equal to the data keyed in by the astronaut under Nouns 70 and 71 except during R59 where the detent code in bits 9-7 is computed to reflect the azimuth position code in R3 under the display V06 N79.
Garbage.
These words are known to vary by Luminary software version
| Version |
Description |
|---|---|
| Luminary 1 |
VGTIGs (X, Y, Z). Velocity-to-be-gained
at ignition. For external-ΔV type burns this is the
input ΔV rotated through half the calculated central angle
expected to be covered by the burn. Calculated once a
the beginning of each of P40, P41, and P42. In
reference coordinates, scaled (meters/centisecond)/27.
VGPREV (X, Y, Z) appears in the same location once Average G
has been turned on (TIG - 30 seconds). This is the
velocity-to-be-gained used by steering in P40 and P42, and
for display in P41. VGPREV is updated every 2 seconds
during the burn. In reference coordinates.
Scaled (meters/centisecond)/27. |
| Luminary 1A, 1B, 1C, 1D |
LANDING SITE VECTOR (X, Y, Z). Landing site in moon-fixed coordinates. "LAND" is initialized from this vector (RLS) at the start of P63. RLS is recomputed after landing by P68 and is computed by P57 if the landing site determination option is selected. Otherwise except perhaps by uplink, it does not change. Scaled meters/227. |
LR VELOCITIES (Raw Data). Landing radar beam velocities (X,
Y, Z). The data readout from the Landing Radar High Speed
Counter into LGC input counter 468. Always
contain the last values which were read, i.e., these registers are
never initialized. Each component read once per second
during R77. Each component read once per four seconds during
LR option of R04. Scaled (15-bit integer - 12288.2) × K
ft/sec where K = -0.6440 for Vx, K = 1.212 for Vy,
and K = -0.8668 for Vz.
These words are known to vary by Luminary software version.
| Version |
Description |
|---|---|
| Luminary 1, 1A |
|
| Luminary 1B, 1C, 1D, 1E |
VGTIGs (X, Y, Z). Velocity-to-be-gained at ignition. For external-ΔV type burns this is the input ΔV rotated through half the calculated central angle expected to be covered by the burn. Calculated once a the beginning of each of P40, P41, and P42. In reference coordinates, scaled (meters/centisecond)/27. VGPREV (X, Y, Z) appears in the same location once Average G has been turned on (TIG - 30 seconds). This is the velocity-to-be-gained used by steering in P40 and P42, and for display in P41. VGPREV is updated every 2 seconds during the burn. In reference coordinates. Scaled (meters/centisecond)/27. |
REDO COUNTER. Counter for hardware restarts. Set to
zero by keyboard freshstart (Verb 36). Incremented once per
hardware restart by restart program (GO PROG). Scaled 2-14.
FINAL DESIRED CDUs (X, Y, Z). The target attitude (desired
outer, inner and middle gimbal angles) for all coasting flight
automatic maneuvers and for the ISS coarse align loop. Also,
used in the FDAI attitude error display checkout routine
(V43). Computed as inputs to the coasting flight automatic
attitude maneuver routine (KALCMANU) and prior to or during
R60. Also computed whenever a coarse alignment is to be
made. The astronaut can load these quantities directly via
N22. The extended verbs V41N20, V43, V49, will request a
load of these angles. These registers are unsigned 15-bit
fractions. The quantities are scaled degrees/360
RSBBQ. Loaded with the setting of the BBANK and Superbank
when a hardware restart occurs.
RSBBQ + 1. Loaded with the setting of the Q-register when a
hardware restart occurs.
CURRENT BODY RATES (X, Y, Z). Estimated current rates about body axis. Calculated at the beginning of every DAP cycle every 0.1 sec. Zeroed at DAP start-up. Scaled (degrees/sec)/45. Expected range of ±10 degrees/sec but ±45 degrees/sec possible.
Garbage.
DAP INTERNAL DESIRED CDUs (X, Y, Z). Outer, inner and
middle intermediate desired gimbal angles. Steering commands
to DAP. Generated during a burn by guidance equations or
during an automatic maneuver. Calculated every 2 secs during
a PGNCS controlled burn (i.e., P40, P42). Updated every 0.1
sec by the DAP (using DELCDUs) during an automatic maneuver
(KALCMANU) and also during powered flight. These registers
are unsigned 15-bit fractions. Scaled degrees/360.
Garbage.
ACTUAL CDUs (X, Y, Z). The current outer, inner and middle
IMU gimbal angles. Automatically updated by the hardware
when the IMU is on. These registers are unsigned 15-bit
fractions. Scaled degrees/360.
ACTUAL RR TRUNNION CDU. RR trunnion angle CDU
counter. Defines the RR antenna position (along with shaft
angle). Updated from RR CDUs as trunnion angle
changes. This register is an unsigned 15-bit fraction.
Scaled degrees/360.
FLAGWORD 0. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
NEED2FLG. A 1 means display DAP rates
on FDAI needles. A 0 means needles will have either
mode 1 or mode 2 attitude error displays. Set 1 by
V60. Set 0 when V61 or V62 selected. Also set 0
when R60 selected. |
||||||
| 14 |
JSWITCH. Bit set 1 to indicate that
extrapolation of W-matrix is being carried out in orbital
integration routine. Bit set to 0 to indicate that the
state vector extrapolation is being carried out in orbital
integration routine. Bit would remain 0 until bit 1 of
flagword 3 becomes 1. |
||||||
| 13 |
MIDFLAG. Set to 1 in orbital
integration when magnitude of conic position vector is
greater than the constant RME when earth is primary body and
RMM when moon is primary body and set to 0 when magnitude is
less than these constants. In LUMINARY, these
constants are set to POSMAX; therefore MIDFLAG should never
be set to 1. If MIDFLAG were set to 1, integration
would attempt to include secondary body and solar
perturbations in the orbit. Since position vectors of
the moon and sun are needed, and these are not available in
LUMINARY, integration would be invalid and possibly
disastrous. |
||||||
| 12 |
MOONFLAG. Set as follows in orbital
integration when integrating the stored CSM and LM state
vectors: 1 indicates lunar orbit, 0 indicates earth
orbit. Also set to 0 or 1 in integration when
switching coordinate centers but this can't be done in
LUMINARY because logic is engaged by MIDFLAG = 1. Also
set to 0 (earth-orbit) or 1 (lunar-orbit) in P21, R31,
INITVEL, P32 thru P35, P72 thru P75 when specifying a state
vector to integrate and in P27, P76 when using integration
subroutines to store modified state vectors for systems use. |
||||||
| 11 |
P21FLAG. Bit set to 1 when base vectors
have been saved and indicates that integration is to be
performed from base vectors which were computed during
previous integration. Bit set to 0 when P21 is
established and on restarts. Setting the bit to 0
means that the base vectors have not been computed;
integration must operate to compute base vectors for use in
subsequent passes. Cleared in all software and
hardware restarts. |
||||||
| 10 |
FSPASFLG. Bit is set to 1 during P22 at
the point in the designate routine (R21) when the line of
sight is not in mode 2 coverage (the Predesignate routine is
necessary). A 1 indicates the first pass through the
Predesignate routine. Bit is reset to 0 when the line
of sight is inside mode 2 coverage; another line of sight
computation is done before continuous designation
starts. A 0 indicates that it is not the first pass
through the Predesignate routine. |
||||||
| 9 |
P25FLAG. A 1 means P25 is
operating. A 0 means P25 is not operating. Set
to 1 at the beginning of P25. Set to 0 by P63, V56,
Terminate Tracking, or by selection of P00. |
||||||
| 8 |
IMUSE. Set to 1 by P51 and R02.
Reset to 0 by P00, P06, IMU performance tests, Extended Verb
56 (if tracking is operating), and all new program
selections unless either RNDVZFLG or P25FLAG is 1. Bit is
examined by R47 and by the T4RUPT turn-on sequence to
determine whether to do IMU CDU Zero. If the bit is 1,
CDU Zero is bypassed. The effect of this is that CDU
Zero is not done in AGS Initialization or after a restart if
IMUSE is 1. |
||||||
| 7 |
RNDVZFLG. A 1 means P20 or P22 is
operating. A 0 means P20 or P22 is not
operating. Set to 1 at the beginning of P20 or
P22. Set to 0 by V56, Terminate Tracking, or by
selection of P00. Set to 0 by the ISS Service Routines
in T4RUPT if a change in the ISS operate discrete is
detected. Set to 0 by P06-Standby Program, P12, and
P63. |
||||||
| 6 |
RRNBSW. A 1 means RR target is in
nav-base coordinates. A 0 means RR target is in
stable-member coordinates. Set to 1 by V41 RR Coarse
Align. Set to 0 by LPS20.1 (subroutine of
P20/P22). Set to 0 by Stable Member Designate
Subroutine (used by R21 and R24 in P20/P22). |
||||||
| 5 |
LOKONSW. A 1 means radar lock-on is
desired in RR Designate. A 0 means radar lock-on is
not desired in RR Designate. Set to 1 by R21 RR
Designate Routine of P20/P22. Set to 1 by V41 RR
Coarse Align if the Lockon Option is selected. Set 0
by R26. Set 0 by V41 RR Coarse Align if the Continuous
Designate Option is selected. |
||||||
| 4 |
NEEDLFLG. Set to 1 by Verb 62 or R60
and reset to 0 by Verb 61 (or a fresh start). Used to
control the information presented on the FDAI attitude error
needles by the LM DAP. If bit is 1, the "total
attitude error" is displayed, defined as THETAD-CDU (THETAD
is the Noun 22 cells) rotated into pilot axes (P, Q,
R). The crew may use this display as a "fly to"
indicator when performing manual maneuvers to the attitude
specified by the gimbal angles in Noun 22. If the bit
is 0, the "autopilot following error" is displayed.
This is the same error which is used in controlling the
firing of the RCS jets and is provided as a monitor of the
LM DAP. |
||||||
| 3 |
FREEFLAG. Used as a temporary flag to
control the internal logic of the following
subroutines: R51, R54, P51, P57, and LSPOS. |
||||||
| 2 |
R10FLAG. Bit is set to 1 during ascent
(in P12, P70, and P71) to indicate that R10 only outputs
data to altitude and altitude rate meters. Bit reset
to 0 (initially and during descent) to indicate that R10
outputs data to the Forward and Lateral velocity
cross-pointers, in addition to the altitude and altitude
rate meters. Bit is checked in R10 (Landing Analog
Displays) in order to determine the type of output to
display. |
||||||
| 1 |
This bit is known to vary by Luminary
software version.
|
FLAGWORD 1. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
NJETSFLG. Used for thrust determination
in P41. Set in R03 (entered via V48) as follows:
set to 1 if bit 11 of DAPDATR1 is 0, indicating that 2-jet X
translation is specified; set to 0 if bit 11 of DAPDATR1 is
1, indicating 4-jet X translation. |
||||||
| 14 |
DIDFLAG. Bit is set to 1 in R10 to
indicate that R10 has performed initialization sequence on
the first pass, and inertial data is available for displays
on subsequent passes thru R10. Bit is reset to 0 in
R10, FRESH START, and RESTART to force R10 to perform
initialization sequence if the mode select switch is set at
PGNCS. Bit will remain at 0 when inertial data
displays are not desired. Bit is examined when the
mode select switch is set at PGNCS, indicating that the
astronaut requests inertial data displays. |
||||||
| 13 |
ERADFLAG. Used in lat-long
subroutine. For the earth, a 1 means compute Fischer
ellipsoid radius; a 0 means use fixed radius. For the
moon, a 1 means use fixed radius; a 0 means use RLS
(lunar land site radius) for lunar radius. Set to 0 or
1 by routines that use lat-long subroutine. |
||||||
| 12 |
RODFLAG. Bit is set to 1 on the first
pass thru P66 to designate continuation of algorithm without
reinitialization. A 1 indicates that the
rate-of-descent mode is in progress. If in P66, a 0
indicates that there has been a restart. Bit is set to
1 to check for restarts and fresh start. Bit is set to
1 only when the vertical guidance (landing phase) is in
effect, the SCSMODE is in attitude hold, and the ROD switch
has been activated. |
||||||
| 11 |
This bit is known to vary by Luminary
software version.
|
||||||
| 10 |
R61FLAG. Bit is set to 1 by UPFLAG at
the start of R61, to indicate that R61 is in
operation. Bit is reset to 0 by DOWNFLAG at the start
of R65, to indicate that R65 is in operation. Bit is
tested during R61, R65 to determine exit from these
routines. |
||||||
| 9 |
Not used. |
||||||
| 8 |
VEHUPFLG. A 1 means CSM state vector to
be corrected by Navigation. A 0 means LM state vector
to be corrected by Navigation. Set to 0 at the
beginning of P20. Set to 0 by V80 Update LM. Set
to 1 by V81 Update CSM. Set to 1 at the beginning of
P22. |
||||||
| 7 |
UPDATFLG. A 1 means updating of the
state vector by Navigation is allowed. A 0 means
updating of the state vector by Navigation is not
allowed. Set to 1 at the beginning of P20 or
P22. Set to 0 by V37 selection of a program other than
P20 or P22. Set to 1 by V37 selection of P20 or P22 if
either is already operating. Set to 0 by V56 Terminate
Tracking. Also set 0 by V34E response to a P20 display
(except V06N49). Set to 1 by Rendezvous Targeting
Programs (P32, P33, P34, P35 and P72 thru P75) during the
loading of input data and set to 0 by these programs when
starting the targeting computations. |
||||||
| 6 |
NOUPFLAG. A 1 means neither the CM nor
the LM state vector may be updated by Navigation. A 0
means either state vector may be updated (see bit 8 of this
flagword). Set to 1 by V95 Inhibit State Vector
Updating. Set to 0 by V80 Update LM V81 Update CSM. |
||||||
| 5 |
TRACKFLG. A 1 means tracking of CSM
allowed. A 0 means tracking of CSM not allowed.
Set to 1 at the beginning of P20 or P22. Set to 0 by
V37 selection of a program other than P20 or P22. Set
to 0 (if 1) by V56 Terminate Tracking. Also set 0 by
V34E response to a P20 display (except V06N49). Set to
1 by V37 selection of P20, P22, or P25, unless one of these
is already running. Set to 1 by all of the rendezvous
targeting programs (P32, P33, P34, P35, and P72 thru P76) at
the beginning of the targeting program. Set to 0 by
the IMU mode switching routines when the IMU is put in the
coarse align mode. |
||||||
| 4 |
This bit is known to vary by Luminary
software version.
|
||||||
| 3 |
SLOPESW. Set to 1 at the start of the
LAMBERT routine, and reset to 0 at the end of the first pass
through the internal LAMBERT iteration process
(specifically, inside the ITERATOR subroutine, which
calculates the increment to be added to the independent
variable for use on the next pass). The bit controls
the type of computation performed in the ITERATOR
subroutine. This bit is equivalent to the switch f3
of Section 5.5 of the GSOP. |
||||||
| 2 |
GUESSW. Set to 1 to indicate to the LAMBERT routine than an initial guess of the independent variable used in the internal LAMBERT iteration process is not available, thus forcing LAMBERT to start iterating from the mid-point of the range of the independent variable. The bit is set to 0 to indicate to LAMBERT than an initial guess is available; this will in general greatly reduce the number of iterations and the computation time inside LAMBERT. The Initial Velocity Subroutine INITVEL always sets the bit to 0 internally immediately after it calls LAMBERT. The bit is also set to 1 by INITVEL, but only when INITVEL is entered via a special entrance. This special entrance is used only by the Pre-TPI Maneuver Program P-34 or P74, the Pre-TPM Maneuver Program P-35 or P75, and the Lambert Aim-Point Maneuver Pre-Thrust Computation Routine. This bit is equivalent to the switch f1 of Section 5.5 of the GSOP. | ||||||
| 1 |
Not used. |
FLAGWORD 2. Bit assignments are as follows:
| Bit |
Meaning |
|---|---|
| 15 |
DRIFTFLG. Set to 1 to enable
free-flight gyro drift compensation and set to 0 to disable
compensation. Set to 0 if IMU caged and prior to the
IMU being coarse aligned and when Average-G program is
started. Set 0 for pulse torquing option of P52.
Set to 1 after IMU coarse alignment and upon termination of
Average-G. |
| 14 |
SRCHOPTN. A 1 means R24 RR Automatic
Search Routine used to lock on to CSM. A 0 means R24
not used to lock on. Set to 0 at beginning of P20 or
P22. Set to 1 at beginning of R24. Set to 0 (if
1) in P20 or P22 before going to R22 RR Data Read Routine. |
| 13 |
ACMODFLG. A 1 means Manual Radar
Acquisition Mode (R23) used to lock-on. A 0 means
Manual Radar Acquisition Mode (R23) not used to
lock-on. Set to 0 at beginning of P20 or P22.
Set to 1 upon return from R23 to P20 or P22 before going to
R22 RR Data Read Routine. |
| 12 |
LOSCMFLG. A 1 means line-of-sight being
computed during Radar Designate. A 0 means
line-of-sight not being computed. Set to 0 when RR
data good discrete (indicating lock-on) is received by the
Radar Designate Routine. Set to 1 at the start of R21
RR Designate Routine. Set to 0 at the end of R21 when
lock-on has been achieved. Set to 0 by V41N72
Designate, R24 Search Routine, and at the beginning of P20
or P22. Set to 1 by R29 when a new line-of-sight is
being computed. |
| 11 |
STEERSW. Bit is set to 1 in SERVICER
(P40 or P42) to indicate that cross-product steering
computations are to be performed and the result loaded into
communication cells with the DAP (if the MODE SELECT SWITCH
is in AUTO). Bit is set to 0 when time-to-go (for a
closed-loop guided burn, including predicted thrust decay)
first drops below 4 seconds, or if bit 7 of FLAGWRD7 = 0 and
the output of the accelerometers is below about 0.12 m/sec
(CSM-docked), 0.36 m/sec (DPS), or 3.08 m/sec (APS) (for the
2-second interval). Bit is set to 1 if the
accelerometer output goes above these thresholds (if bit 7
FLAGWRD7 = 0). *If bit is 0, only the
required velocity is updated (no derivation of time-to-go or
steering commands are performed). Bit is set to 1 in
SERVICER (P12, P63 thru P66) but it is not looked at in P12,
P66, and P70/P71. Set 0 in SERVICER in P12 and descent
programs. |
| 10 |
Not used. |
| 9 |
IMPULSW. Bit set to 1 when a countdown
to initiate engine (DPS or APS) cutoff is required (i.e. the
value of time-to-go is known and is not to be updated
further). The bit is set to 0 unconditionally at the
start of S40.13 (entered about 5 seconds before nominal
ignition, and comprising the "short burn test and time-to-go
predictor" routine), and is then set to 1 if it is concluded
that the predicted burn duration is to be less than 6
seconds. (For DPS burns, a thrust level of
approximately 10% is used.) The bit is set to 1 when
time-to-go (for "long" burns) is less than 4 seconds; it is
reset to 0 after being sensed (when the action to perform
the engine cutoff has been initiated, so as to avoid double
initiation). |
| 8 |
XDELVFLG. Set to 1 if an External Delta V burn is to be performed. Set to 0 if a Lambert burn is required. Set to 1 in P30 before N42 display. Set 1 by P72 and P73. For P34, P35, P74, and P75 — set to 0 in subroutine S34/35.2. For P32/P72 and P33/P73 set to 1 in subroutine ADVANCE. |
| 7 |
ETPIFLAG. A 1 means elevation angle
supplied for P34, P74-compute TPI. A 0 means no
elevation angle supplied for P34, P74-compute ELEV.
Set to 0 initially in P34, P74. After ELEV has been
input (V06N55), the bit is set to 1 if the ELEV input is
non-zero. |
| 6 |
FINALFLG. A 1 means last pass through
rendezvous program computation. A 0 means interim pass
through rendezvous program computation. Set to 0 by
subroutine SELECTMU which is called at the start of P32 thru
P35, and P72 thru P75 to perform initialization. Bit
is set to 1 by P30. Set to 1 by subroutine VN1645
(which is called to perform calculations and display Noun 45
data) upon receipt of proceed to Noun 45 if FINALFLG not
already set. |
| 5 |
AVFLAG. Set to 1 if LM is active
vehicle, set to 0 if CSM is active vehicle. Set to 1
in subroutine AVFLAGA which is called at the start of P32,
P33, P34 and P35 to indicate that the LM is the active
vehicle. Set to 1 in subroutine S40.9 and program
P42. Set to 0 in subroutine AVFLAGP which is called at
the start of P72, P73, P74 and P75. |
| 4 |
PFRATFLG. Set to 1 if an IMU
orientation matrix has been stored for the preferred IMU
alignment option. Set to 1 in P40, P41, and P42 after
computation of the "preferred IMU orientation" for engine
ignition. Bit is reset to 0 in P52 after completion of
coarse align and gyro torque coarse align, and at the end of
re-align routine R51. |
| 3 |
CALCMAN3. Set to 1 by the attitude maneuver routine (KALCMANU) to indicate that no gimbal lock avoidance (in going from the initial to final spacecraft attitude) is required. Since the checks for intermediate gimbal lock as well as the gimbal lock avoidance feature have been removed, the bit should be 1 after the first maneuver computation and remain so (the final middle gimbal angle, THETAD+2 is checked and must be less than about 70° for the maneuver to be carried out). |
| 2 |
CALCMAN2. A 1 means perform maneuver
starting procedure (in KALCMANU). A 0 means bypass
starting procedure. Set to 1 at the end of a large
attitude calculation of maneuver parameters and reset after
some computations concerning initial conditions for
generation of the commands have been completed. Bit
signifies that first iteration through the command
generation equations is being performed; depending on
phasing of the telemetry output with respect to the guidance
computations, the 1 setting may or may not be observed on
the downlink. |
| 1 |
NODOFLAG. Set to 1 by R47, |
FLAGWORD 3. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
POOHFLAG. Set to 1 in STATINIT 1 as P00
integration is started to bypass backwards integration
and perform check for 4 time-step criterion while P00
integration loop is going. Set to 0 in V37 logic. |
||||||
| 14 |
GLOKFAIL. Set to 1 when CALCGA detects
gimbal lock (alarm 401 occurs at the same time bit is
set). Tested in IMU performance tests; if 1, PIPA test
is done and GLOKFAIL is reset to 0. Also reset in R00. |
||||||
| 13 |
REFSMFLG. Set to 1 if a meaningful
REFSMMAT, reference to stable member matrix, is available,
i.e. the alignment of the IMU is known in inertial
(reference coordinate) space. Set to 1 after
computation of REFSMMAT in the IMU orientation determination
routine P51. Reset to 0 in the coarse align routine
R50 and set to 1 on completion of R50 and on completion of
gyro torque coarse align, after desired orientation is
stored in REFSMMAT. Reset to 0 in gravity vector
determination routine in P57. Reset to 0 in coarse
align routine IMUCOARS. Set to 1 after desired
orientation is stored in REFSMMAT after alignment is
completed in P57. |
||||||
| 12 |
LUNAFLAG. Used in lat-long
subroutine. A 1 means lunar lat-long. A 0 means
earth lat-long. Set to 0 or 1 by routines that call
lat-long subroutine. |
||||||
| 11 |
This bit is known to vary by Luminary
software version.
|
||||||
| 10 |
VFLAG. Used in automatic star selection
routine (R56) during IMU alignment program (P52). Set
to 1 to indicate that a pair of stars are not in the AOT
field-of-view. Set to 0 if pair of stars found.
Initially set to 1 at beginning of R56 and is used
temporarily for program control purposes. |
||||||
| 9 |
In all Luminary software versions, this bit
has the following interpretation: R04FLAG. Set
to 1 by Verb 63 entry to indicate R04 is running and set to
0 at the end of R04. Set to 0 by P20 or P22
selection. Set to 0 in R00 (V37). However, in Luminary 1, 1A, 1B, and 1C, it also has an additional secondary interpretation: READRFLG. Bit is set to 1 by R29 when RR lock-on has been achieved and the RR read cycle is starting. A 1 indicates that R29 is reading RR data. Bit is reset to 0 by R29 when exiting the RR read cycle because of a bad reading or the RR not in LGC mode. Bit is reset to 0 by software restart (V37), FRESH START, and hardware restart. A 0 indicates that R29 is not reading RR data. Bit is tested by the RR read cycle of R29 to determine if radar read is allowed. |
||||||
| 8 |
PRECIFLG. Set to 1 in the integration
routine on calls to CSMPREC, LEMPREC, INTEGRVS, and in P00
when integrating LM. Set to 0 when completing
integration and in P00 when integrating CSM. PRECIFLG
= 0 engages integral time step logic in integration when
major mode is 00. |
||||||
| 7 |
CULTFLAG. A 1 means star
occulted. A 0 means star not occulted. Used in
automatic star selection routine (R56) during the IMU
alignment program (P52). Set to 1 to indicate that the
particular star being checked lies too close to the computed
position of the Sun, Earth, or Moon. |
||||||
| 6 |
ORBWFLAG. Not used. Bit is not
set to 1 in LUMINARY. |
||||||
| 5 |
STATEFLG. Set to 1 if the permanent
state vector is to be updated by orbital integration.
Bit is checked after completion of integration (either CSM
or LM) and, if it is 1, it is reset to 0 and the appropriate
loading of permanent and downlink state vectors (either CSM
or LM) is accomplished. Also set to 0 after V96 if
QUITFLAG is 1. Set 0 by POODOO routine. Set to 1
if W-matrix integration overflows. Set to 1 for
periodic integration in P00 (LM and CSM) and to 0 if P00
integration not to be done (QUITFLAG = 1). Set to 1 in
P22 and P20 for integration to mark time and to cause
permanent integration on initial operation of P20 and P22. |
||||||
| 4 |
INTYPFLG. Set to 1 if conic
extrapolation to be done in orbital integration, set to 0
for precision extrapolation. |
||||||
| 3 |
VINTFLAG. Set to 1 if CSM state vector
to be integrated; set to 0 if LM state vector to be
integrated. Set internally in integration on calls via
CSMPREC (conic), LEMPREC (conic) and by callers of INTEGRV
and INTEGRVS. |
||||||
| 2 |
D6OR9FLG. Used by orbital integration
for W-Matrix integration: if bit is 1, 9 × 9 matrix is
integrated; if bit is 0, 6 × 6 matrix is integrated.
Set to 0 or 1 by P00 periodic integration, P20, P22 and
Average-G to coasting flight. |
||||||
| 1 |
DIMOFLAG. Used by orbital integration
for W-Matrix integration: if bit is 1, W-Matrix is to
be integrated; if bit is 0, no W-Matrix integration is to be
done. Set to 0 or 1 by P00 periodic integration, P20,
P22 and Average-G to coasting flight. |
FLAGWORD 4. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
MRKIDFLG. Set to 1 if a mark/extended verb
display is waiting for a response: it signifies that a
display of this type is in the "ENDIDLE" routine of the DSKY
package ("pinball"). |
||||||
| 14 |
PRIODFLG. Set to 1 if a priority display is
waiting for a response. It signifies that a display of
this type is in the "ENDIDLE" routine of the DSKY package. |
||||||
| 13 |
NRMIDFLG. Set to 1 if a normal display
(most of the displays in the program are in this category)
is waiting for a response: it signifies that a display of
this type is in the "ENDIDLE" routine of the DSKY package. |
||||||
| 12 |
This bit is known to vary by Luminary
software version.
|
||||||
| 11 |
MWAITFLG. Bit included in logic
assignments to permit function similar to bit 10 to be
applied to mark/extended verb displays. Bit is set to
1 if a mark/extended verb display is waiting to be
initiated. Set to 1 if a priority display is presently
on the DSKY. Bit is used in case a priority display
has been generated after an extended verb has passed the
lockout check, but before corresponding verb display. |
||||||
| 10 |
NWAITFLG. Set to 1 if a normal display
is waiting to be initiated (e.g. program attempts to
initiate a normal display when an extended verb or mark
display is occupying the DSKY). Helps give DSKY
sequence of crew-initiated display, crew-initiated monitor
display, priority display, interrupted mark/extended verb
display, interrupted normal display, and waiting normal
display. |
||||||
| 9 |
MRKNVFLG. Set to 1 if a mark/extended
verb display attempt found the display system busy (due to
crew or uplink use for a display, including an externally
initiated monitor display). Bit reset after
appropriate display initiated (following key release
response). |
||||||
| 8 |
NRMNVFLG. Set to 1 if a normal display
attempt found the display system busy (cf. bit 9). |
||||||
| 7 |
PRONVFLG. Set to 1 if a priority
display attempt found the display system busy (cf. bit 9). |
||||||
| 6 |
PINBRFLG. Set to 1 if it is concluded
that "interference" with the internally generated display
has taken place (e.g. an enter verb was used but the
associated noun was not that requested by the
program when the internally generated display was produced),
or if a termination for an extended verb/mark routine is
performed with bit 14 or bit 13 of this word = 1. Bit
reset to 0 upon successful conclusion of a priority or
normal display after having been used to bypass internal
checks that otherwise would cause a program abort. |
||||||
| 5 |
MRUPTFLG. Set to 1 if a mark/extended
verb display or display attempt has been interrupted by a
priority display. |
||||||
| 4 |
NRUPTFLG. Set to 1 if a normal display
or display attempt has been interrupted by a priority
display or by a mark/extended verb display. |
||||||
| 3 |
MKOVFLAG. Set to 1 briefly if a
mark/extended verb display is to interrupt a normal display
(used to control internal program branching, whereupon it is
reset to 0). |
||||||
| 2 |
Not used. |
||||||
| 1 |
XDSPFLAG. Set to 1 to indicate that a
mark display status exists. This will lock out normal
displays. |
FLAGWORD 5. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
DSKYFLAG. A 1 means displays sent to
DSKY. A 0 means no displays sent to DSKY. Set to
1 (if 0) by subroutine of the Keyrupt routine.
Subroutine of T4RUPT program branches according to DSKYFLAG
setting. |
||||||
| 14 |
This bit is known to vary by Luminary
software version.
|
||||||
| 13 |
SNUFFER. Bit is set to 1 to inhibit RCS
control about the U and V axes during unstaged powered
flight. Set to 0 by Verb 75. Set to 1 by Verb
65. |
||||||
| 12 |
NOTHROTL. Bit set to 0 in P40 to
indicate that the burn will last longer than 95 seconds at
approximately 10% thrust and that the engine should be
throttled to maximum in the number of centiseconds after
ignition indicated by the contents of ZOOMTIME. Bit
set to 1 unconditionally in S40.13 (time-to-go predictor)
and then reset to 0 if the predicted burn duration at 10%
thrust is greater than 95 seconds. Bit set to 0 in
P63. |
||||||
| 11 |
R77FLAG. Bit is set to 1 at the start
of R77 (in response to V78), if R77 operation is
permissible. Bit is reset to 0 at the end of R77 (in
response to V79), and by FRESH START (V36). Also set 0
by V37/software restarts or hardware restart. Bit is
checked in the RADAREAD routine: if bit is a 1 (R77 in
operation), no checks are made for data fails. Bit is
checked in RADSAMP (Radar Sampling Loop); if bit is a 1, the
portion of coding particular to R04 is bypassed. Bit
is checked at entry to both R04 and R77: if either is
selected while the bit is set to 1, an operator error will
be indicated. Bit is checked at entry to V40N72,
V41N72, and V59: if any one of these extended verbs is
called while the bit is set to 1, an operator error will be
indicated. |
||||||
| 10 |
RNGSCFLG. A 1 means a change has
occurred in the RR range scale discrete while reading the
range. A 0 means no change has occurred. Set to
0 at the beginning of each RR Read sequence in R22 RR Data
Read Routine. Set to 1 by the Radar Interrupt
Processor if the range scale discrete changes while reading
the range. |
||||||
| 9 |
DMENFLG. Set to 1 if the dimension of
the W-Matrix is 9 for measurement incorporation. Set
to 0 if the dimension of the W-Matrix is 6 for measurement
incorporation. Set to 1 by the Rendezvous Navigation
Routine. |
||||||
| 8 |
ZOOMFLAG. Set 1 at throttle up to
indicate throttle up and to start guidance. Reset 0 at
TIG-5 to prepare for throttle up. Tested at start of
landing guidance equations: if 0 do N63 display only; if 1
do landing guidance. |
||||||
| 7 |
ENGONFLG. Bit set to 1 just after the
DPS or APS engine is turned on (bit 13 of channel 11 set to
1 and bit 14 of channel set to 0), and reset to 0 when the
engine is turned off (bit 14 set 1 and bit 13 set to 0 in
channel 11). This happens in P12, P40, P42, P70, and
P71. Bit is set to 1 in P63 and reset to 0 in
P68. Bit is used when a restart occurs to determine
the proper setting for the channel bits. Engine is
turned off following ENTER response to V97. |
||||||
| 6 |
3AXISFLG. A 1 means maneuver specified
by three gimbal angles (Noun 22). A 0 means maneuver
specified by two vectors. Set to 1 prior to entering
R60 if the attitude maneuver to be made is specified by
three angles (Noun 22). If it is 0, the attitude is
specified by two vectors, the body fix vector (SCAXIS) and
the direction in which this is to be pointed
(POINTVSM). Another routine, VECPOINT, is used to
compute the corresponding desired gimbal angles (Noun
22). Reset to 0 before exit from R60. Most calls
to R60 require a VECPOINT solution (bit = 0). V49
(R62) uses the three gimbal angle option (bit = 1). |
||||||
| 5 |
AORBSFLG. A 1 means P-Axis couples 7,
15 and 8, 16 used. A 0 means P-Axis couples 4, 12 and
3, 11 used. |
||||||
| 4 |
NORRMON. Set to 1 if the gimbal monitor
function of the RR Monitor Routine, R25, is disabled; set to
0 if enabled. Set to 0 at the beginning of
P20/P22. Set to 1 at the beginning of RR Manual
Acquisition Routine (R23); set to 0 when exiting R23.
Set 1 by R26. Set to 1 by V41 RR Coarse Align if the
No Lockon Option is chosen. Set to 0 by V44 Terminate
Coarse Align Continuous Designate. Set 0 by
hardware/software restart or V37. |
||||||
| 3 |
SOLNSW. Set to 1 by the LAMBERT routine
if the routine could not accurately solve the problem with
which it was called (i.e., if sufficient convergence was not
achieved to the specified transfer time, or if the subtended
true anomaly difference between the two input position
vectors was less than about 1/2 minute of arc). Reset
to 0 by LAMBERT if a successful LAMBERT solution was
obtained. Set to 1 by the TIME-RADIUS Routine if this
routine was called with an orbit having an eccentricity less
than about 0.000004, and reset to 0 if the eccentricity was
greater than this value (regardless of what the specified
terminal radius is, and regardless of whether this radius
could be reached conically from the input state
vector). Thus, for TIME-RADIUS Routine, the resetting
of this bit to 0 does not necessarily imply a successful
TIME-RADIUS solution. This bit is never tested by any
of the mission programs. This bit is equivalent to the
switches f5 and f9 of Section 5.5 of
the GSOP. These two switches are represented by the
same bit in the AGC. |
||||||
| 2 |
MGLVFLAG. A 1 means local vertical
coordinates computed. A 0 means middle gimbal angle
computed. Set to 0 by subroutine SETMGA after
computation of the middle gimbal angle. Set to 1 by
subroutine GET.LVC after computation of local vertical
coordinates. |
||||||
| 1 |
RENDWFLG. Set to 1 to indicate that the
W-Matrix is valid and should not be re-diagonalized in
navigation (P20 or P22), set to 0 to indicate W-Matrix is
invalid. Set to 1 in P20 or P22, after initializing
the W-Matrix when state vector correction is being done and
RENDWFLG is initially set to 0. Set to 0 when
integration of the W-Matrix overflows. Set to 0
by V93. Bit is reset to 0 by V67 if new W-Matrix
initialization values have been loaded by V67. Set to
0 when state vectors are uplinked by P27. Set 0 in
P12. Used in P00 periodic state vector update, powered
flight to coasting flight transition routine (AVETOMID) and
P20 or P22 to determine if W-Matrix should be integrated to
maintain synchronization of state vectors and W-Matrix. |
FLAGWORD 6. Bit assignments are as follows:
| Bit |
Meaning |
|---|---|
| 15 |
S32.1F1. Used in P32, P72 to terminate
iteration if ΔVCSI exceeds 1000 ft/sec twice
during the iteration. Set to 0 at start of each
iteration loop. Set to 1 if |ΔVCSI|>1000
ft/sec and subsequent test of bit in case |ΔVCSI|>1000
ft/sec will terminate iterative loop. |
| 14 |
S32.1F2.
Controls first step size of iterative loop to establish two
points for Newton-Raphson iteration in P32, P72. Set
to 1 at start of each iterative loop. Set to 0 after
first step. |
| 13-12 |
S32.1F3A and S32.1F3B. Control setting of alarm codes during first iterative loop and control the 50 ft/sec steps utilized to establish the starting point of the second iterative loop in P32, P72. Bits set (0, 1) at start of first iterative loop to allow setting of the alarm codes. Set (0, 0) at start of second iterative loop until after first 50 ft/sec step is taken, when set (1, 1). Set (1, 0) after the angular error undergoes a sign change. |
| 11 |
Not used. |
| 10 |
GMBDRVSW. Bit used in "TRIMGIMB", a
subroutine called by R03 (entered via Verb 48) to indicate
that the trim gimbal has been driven to the correct position
in either pitch or roll (depending on which gets finished
first). Bit is unconditionally set to 0 at start of
"TRIMGIMB" and is checked at the conclusion of the roll
drive task and the pitch drive task; if the bit is 0
(indicating that the other task has not been completed yet)
it is set to 1 and the current task ended; if it is already
1 (indicating that the other task has already finished) a
return to routine 03 is initiated (via a NOVAC job call) and
the task ended. |
| 9 |
Not used. |
| 8 |
MUNFLAG. Bit is set to 1 at entry to
P12 and P63. Bit is reset to 0 at the termination of
SERVICER. Bit is checked by R25: if both AVEGFLAG and
MUNFLAG are set to 1, R25 exi |
| 7 |
Not used. |
| 6 |
REDFLAG. Bit is set to 1 by "proceed"
response to V06N64 in P64 to enable landing site
redesignation capability. Bit is reset to 0 at the
start of P63, P64 as initialization. Set 0 in P64 if
TREDES = 0. Bit is tested by P64 display routine to
determine whether to flash V06N64, and by redesignation
logic to determine whether to allow redesignations. |
| 5 |
Not used. |
| 4 |
Not used. |
| 3 |
NTARGFLG. A 1 means astronaut did
overwrite delta velocity. A 0 means astronaut did not
overwrite delta velocity. Set to 0 in subroutine
S34/35.5 (used by P34, P35, P74, and P75) initially before
displaying Noun 81. If the values for Noun 81 are
changed by the astronaut, NTARGFLG is set 1 after a PROCEED
response, and the new target vector is computed based on the
loaded Delta V (LV). |
| 2 |
AUXFLAG. Bit is set to 1 by SERVICER whenever the delta-V monitor is bypassed. When the delta-V monitor detects that the bit is a 1, the monitor knows that it must be on the first pass; the monitor then bypasses further activity and resets the bit to 0. A 0 indicates that the delta-V monitor is on the second or later pass and can perform its normal functions. The bit is used only by the delta-V monitor as a one-pass delay mechanism. |
| 1 |
ATTFLAG. Bit is set to 1 by REFMF
routine during the Lunar Surface Alignment Program P57 if
the REFSMMAT flag is set 1 and the Post Lunar Landing
Program P68, after LM Y and Z axis vectors are calculated in
moon-fixed coordinates and stored in YNBSAV and
ZNBSAV. Bit is reset to 0 by a FRESH START. If
align technique 0 or 1 is selected, alarm 701 will be
displayed if bit is zero and REFSMMAT is not
available. If align technique 2 or 3 is selected, the
INITALGN flag is clear and the alignment continues.
Bit is tested with each P57 alignment. |
FLAGWORD 7. Bit assignments are as follows:
| Bit |
Meaning |
|---|---|
| 15 |
ITSWICH. A 1 means a solution of TPI
time has not yet been reached. A 0 means a solution
for TPI time has been reached. Bit is reset to 0 in
P34, P74 if the TPI time is given and the elevation angle is
to be computed. Bit is set to 1 in P33, P34, P73, and
P74 when the elevation angle is given and TPI time is to be
computed. Bit is tested at SWCHCLR: if 1, it is
immediately set to 0 and control is transferred to INTLOOP
where the final solution for TPI time is reached; if 0, then
either the TPI time or the elevation angle is displayed
depending on the setting of ETPIFLAG. ITSWICH also
test at TESTY: if 1, the program looking for a solution for
TPI time; if 0, the computed elevation angle is stored. |
| 14 |
MANUFLAG. Not used. Bit is not
set to 1 in LUMINARY. |
| 13 |
IGNFLAG. Set to 1 in P12, P40, P41, P42
and P63 when nominal ignition time has arrived. If bit
is 1 when a "proceed" response is received to the V99
display, engine ignition is performed immediately. Set
to 0 5 seconds before scheduled ignition time or 5 seconds
before next attempt at engine ignition if the astronaut has
keyed in "enter" to the V97 engine fail display. In
the latter case P70 and P71 treat IGNFLAG in the same manner
as the above five programs. Also set to 0 at time
engine (DPS or APS) has been turned on. |
| 12 |
ASTNFLAG. Bit set to 1 in P12, P40,
P42, and P63 when crew authorization for ignition (a
"proceed" to the V99 display) is received. If bit 13
of this word is 1, engine ignition is performed
promptly. Bit is set to 0 at the same time that bit 13
is set to 0. The treatment of this bit for P70 and P71
following an "enter" to the V97 display, is the same as for
P12. |
| 11 |
SWANDISP. Bit is set to 1 in the Master
Ignition Routine at P63IGN and P12IGN portions of the
program to enable Landing Analog Displays (R10). The
mode select switch must be set to the PGNCS position n order
to display. Bit is reset to 0 at the termination of
SERVICER or on landing confirmation to suppress the Landing
Analog Displays. R10 can be executed at the rate of
four times per second, but data will not be displayed while
the bit is 0. The bit is examined immediately upon
entrance to the R10 routine. |
| 10 |
NORMSW. Set to 1 to specify to the LAMBERT routine that it is to use the unit normal vector (to the conic transfer plane) which is provided by the calling program; reset to 0 if LAMBERT is to calculate its own unit normal vector (by crossing the initial and final position vectors of the transfer). Set to 1 by the Initial Velocity Routine, INITVEL (the only routine which calls LAMBERT) whenever INITVEL is called with a (true or offset) target vector which lies inside "the cone"; reset to 0 by INITVEL whenever INITVEL is called with a (true or offset) target vector which lies outside "the cone". ("The cone" is a mathematically-defined cone whose vertex is the origin of coordinates, whose axis is the 180° transfer direction, and whose semi-cone angle is specified to INITVEL.) The semi-cone angle is set to 15° by P34, P35, P74 and P75 because active vehicle transfer angles between 165° and 195° are normally avoided in the targeting procedure. However, if a transfer angle falling within this 180° ± 15° sector is intentionally selected by one of the targeting programs (P34 or P74), or results from one of the maneuver programs (P35 or P75) during an intercept trajectory targeted for more than 180°, the Lambert Aim Point Maneuver Prethrust Routine increases the semi-cone angle to 45° so that active vehicle transfer angle will not change from inside to outside the cone angle during the powered maneuver. Such a condition is undesirable since the intercept trajectory would be retargeted during the powered maneuver. Likewise, if the initial transfer central angle falls outside the 15° semi-cone angle, the semi-cone angle is decreased to 10° to reduce the possibility of a transfer angle changing from outside to inside the cone during a powered maneuver. NORMSW should generally remain 0, unless transfers between 165° and 195° are intended. NORMSW is equivalent to the switch f2 of Section 5.5, and to the switch SR of Section 5.3.3. of the GSOP. |
| 9 |
RVSW. Set to 1 to indicate to the
TIME-THETA and TIME-RADIUS Routines that the only desired
output is the time required to transfer through the
specified transfer angle or to the specified radius
respectively, and set to 0 to indicate that the state vector
at the terminal point is desired in addition to the transfer
time. Set to both 1 and to 0 during the course of the
computations of each standard internal iteration in the
Pre-CSI Maneuver Program P32 or P72. Set to 0 by the
Pre-CDH Maneuver Program P33 or P73. Set to 1 by the
Pre-TPI Maneuver Program P34 or P74. The bit is
equivalent to the inverse of the switch f6 of
Section 5.5 of the GSOP. |
| 8 |
V67FLAG. Set to 0 whenever an extended
verb V67 is taken. The verb displays the RMS position,
velocity, and bias errors from the W-Matrix using a
V06N99. If the astronaut then changes these values,
the bit is set to 1. The bit is tested in the V67CALL
routine: a 1 means compute new initial W-Matrix values for
either rendezvous or lunar surface navigation; a 0 means do
not compute these values. |
| 7 |
IDLEFLAG. Bit set to 1 as part of a fresh start, and used if 0 to permit the Delta-V monitor computations to be performed by the Average-G loop. Bit is always set to 0 when engine is turned on in P12 and P63 (or in P70 and P71 if the astronaut has attempted to relight the engine following an engine failure). In P40 and P42 the bit is set to 0 at engine ignition if and only if bit 9 of flagword 2 is 0 (i.e., burn interval≥6 secs). The bit is set to a 1 in the following instances: 1) Whenever V37 is used to select a new program. 2) In P12, P40, P42, P70, and P71 when TGO is less than 4 seconds (i.e., when a waitlist task is set up to turn off the engine), and 3) when engine fail has been determined (i.e. when V97 appears on the DSKY). In addition the bit is set to 0 if an engine failure is detected and the astronaut keys in a "proceed" to the V97. The bit is set to 1 also if a "POODOO" type of abort occurs while Average-G is running. |
| 6 |
V37FLAG. Set to 1 by PREREAD (Average-G
initialization) to indicate that Average-G is running.
Bit is examined by R00 (Program Change Routine) to detect
Average-G activity and to wait for Average-G termination if
it is on. Reset to 0 by AVGEND after termination of
Average-G. |
| 5 |
AVEGFLAG. Set to 1 by PREREAD
(Average-G initialization) to indicate that Average-G is
desired. Bit is examined by READACCS (PIPA Read
Routine, cycling at 2-second intervals) to determine whether
to continue Average-G cycle. Reset to 0 by R00
(Program Change Routine) to indicate that Average-G should
terminate. |
| 4 |
UPLOCKFL. Set to 1 if a failure of the
CCC data
check is detected in processing an input from the uplink
receiver. The bit can be reset by sending an error
reset code via the uplink (the DSKY error reset key does not
reset the bit). While the bit is 1, all uplink
information except an error reset code is rejected by the
program. |
| 3 |
VERIFLAG. Bit whose value is
complemented when the final proceed entry is received in
P27, indicating that the uplink information is to be used. |
| 2 |
V82EMFLG. A 1 indicates moon
vicinity. A 0 indicates earth vicinity. Set to 1
or 0 by R30 according to whether state vectors are
moon-centered or earth-centered. Bit tested by SR30.1
when called by R30 to compute PERIGEE, APOGEE radius and
PERIGEE, APOGEE height above launch pad or lunar landing
site. |
| 1 |
TFFSW. Set to 1 in CALCTPER, cleared in
CALCTFF. When 1, indicates that present or last
computation was Time to Perigee for Noun 32. When 0,
indicates that present or last computation was Time to Free
Fall for Noun 44. In R30, Time to Perigee is computed
if perigee altitude is at least 300,000 feet above the earth
launch pad (Earth sphere) or at least 35,000 above the lunar
landing site (Moon sphere). Otherwise TFF is computed. |
FLAGWORD 8. Bit assignments are as follows:
| Bit |
Meaning |
|---|---|
| 15 |
RPQFLAG. Internal flag in integration
to indicate if primary body to secondary body position
vector (RPQ) was computed; 1 indicates RPQ not computed. |
| 14 |
Not used. |
| 13 |
NEWIFLG. Internal flag in
integration. Used to engage 4 time step only on the
first step of P00 integration; 1 means first step, 0 means
not first step. |
| 12 |
CMOONFLG. Indicates origin of
"permanent" CSM State Vector; 1 means lunar-centered, 0
means earth-centered. Always set to 0 or 1 depending
on MOONFLAG when permanently updating the CSM state vector. |
| 11 |
LMOONFLG. Indicates origin of
"permanent" LM State Vector; 1 means lunar-centered, 0 means
earth-centered. Always set to 0 or 1 depending on
MOONFLAG when permanently updating the LM state vector. |
| 10 |
FLUNDISP. Bit is set to 1 by R40
(Engine-fail routine) to suppress guidance displays that
P12, P63 thru |
| 9 |
Not used. |
| 8 |
SURFFLAG. Bit is set to 1 by P68.
Bit is reset to 0 by P12 when engine thrust is
detected. Bit is not altered by FRESH START. Bit
is checked by LEMCONIC, LEMPREC, and INTEGRV (when
integrating LM) integration routines; if set, these routines
call the Planetary Inertial Orientation subroutine to obtain
the LM state vector. Bit is checked by R31; if bit is
set to 1, R31 obtains LM state vectors by calling LEMPREC
rather than by calling a conic integration routine.
Bit is checked by V67 to determine whether the W-matrix is
being initialized for P20 or P22. Bit is checked by
P20 and P22 in common coding areas to determine if P20
or P22 is running. Bit is checked by the AOTMARK
routine to determine whether the mark taken is an in-flight
or a surface mark. Bit is checked by the P00
integration routine; if the bit is set to 1, the LM state
vectors are not updated. Bit is checked by SERVICER;
if the bit is set to 1, the LM mass is not altered by
MASSMON. Bit is checked by the LASTBIAS and
NBDONLY routines (IMU compensation routines for free-fall
and lunar surface operation): if the bit is set to 1, these
routines include acceleration-sensitive drift corrections;
whereas, if the bit is reset to 0, only
non-acceleration-sensitive drift corrections are made.
In addition, NBDONLY zeroes the pipas (after reading them)
if the bit is set to 1. P21 checks SURFFLAG to
determine whether LM is on the surface. Bit is checked
in V66 to see if LM is on lunar surface. |
| 7 |
INFINFLG. Set to 1 in the conic
TIME-THETA Routine to indicate that the routine was called
with a hyperbolic initial state vector and a true anomaly
transfer angle which was so large as to require a transfer
past the hyperbolic asymptote of the conic, which is
physically impossible. Set to 0 in TIME-THETA if a
valid physical solution is obtained. Set to 1 in the
conic TIME-RADIUS Routine to indicate that the routine was
called with a hyperbolic initial state vector, a desired
final radius, and a desired sign of the radial velocity of
the final radius (to indicate whether trajectory is to be
inbound or outbound here) which would require a transfer
past the hyperbolic asymptote of the conic. For
example, a spacecraft which is inbound can never return
inbound to a radius which is greater than its current
radius, and likewise a spacecraft which is outbound can
never return outbound to a radius which is less than its
current radius. Set to 0 in TIME-RADIUS if a valid
physical solution is obtained. Set to 1 during any one
(or several) of the internal LAMBERT iterations if the
intermediate solution arrived at on this particular internal
iteration required a transfer past a hyperbolic
asymptote. The LAMBERT routine senses such a situation
on the succeeding iteration and adjusts various parameters
in an attempt to obtain a valid solution. Set to 0 in
LAMBERT if the preceding internal iteration yielded a
physically realizable transfer. The bit is never
tested or set either way outside the conic
subroutines. The bit is equivalent to the switch f7
of Section 5.5 of the GSOP. |
| 6 |
ORDERSW. Never set to 1. Set to 0
as part of a fresh start. Used to control the type of
computation performed in the ITERATOR routine (part of the
conic subroutines). This bit is equivalent to the
switch f4 of Section 5.5 of the GSOP. |
| 5 |
APSESW. Set to 1 by the TIME-RADIUS
routine to indicate that the routine solved for the time
required to reach pericenter (or apocenter) rather than the
desired radius, because the desired radius input to the
routine was less than the pericenter radius (or was greater
than the apocenter radius, respectively). Set to 0 by
the TIME-RADIUS routine to indicate that the routine
attempted to solve for the time required to reach the
desired radius, since the desired radius input was greater
than pericenter radius and less than apocenter radius.
(Such a solution will be reached unless INFINFLG is set to
1.) This bit is equivalent to the switch f8
in Section 5.5 of the GSOP. |
| 4 |
COGAFLAG. Set to 1 by the TIME-THETA routine and the TIME-RADIUS routine if either of these routines was called with an initial state vector having a flight-path-angle (measured from local vertical) less than 1° 47.5' or greater than 178° 12.5'. Set to 0 in each of these routines if either was called with an initial state vector having a flight-path-angle between these two extremes. The bit is never tested or set either way outside the conic routines. |
| 3 |
Not used. |
| 2 |
INITALGN. Bit is set to 1 by P57
alignment to indicate than an initial alignment, technique
0, is being performed. The program will then branch to
the selected alignment technique, unless the selected
technique is 0. Bit is reset to 0 after completion of
the initial alignment to indicate that the final, selected
technique, alignment is to be performed. Bit is reset
to 0 if ATTFLAG is at 0. Bit is tested after each
initial alignment if the alignment technique is 1, 2, or 3. |
| 1 |
360SW. Used to indicate the type of
computation to be performed by the Universal Variable
Routine (a subroutine called by the LAMBERT, TIME-THETA, and
TIME-RADIUS routines). The bit is not of interest
outside these three conic routines and in fact is neither
tested nor set either way outside the Universal Variable
Routine itself. The bit is equivalent to the switch fW
of Fig. 5.10-4 of Section 5.5 of the GSOP. |
FLAGWORD 9. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
Not used. |
||||||
| 14 |
FLVR. Bit is set to 1 in P70, P71
initialization before throttling up the engine, and in P12
during initialization. A 1 indicates that the vertical
rise command overrides the computed guidance command. Bit is
reset to 0 when either the vertical rate is greater than 40
fps or the altitude is greater than 25 K ft. A 0
indicates that computed guidance commands may be used.
Bit is tested in Ascent Guidance Equations to determine
whether vertical rise is required. |
||||||
| 13 |
P7071FLG. Set 1 near the beginning of P70 and P71 to indicate that the ascent guidance equations are operating in abort mode (i.e. explicit targeting and no R29). Pad-loaded 0. Tested as follows: near the beginning of Ascent Guidance Equations, if 1 compute needed ZDOTD; in middle of Ascent Guidance Equations, if 1 compute estimated pericynthion radius (RP), in tipover segment of Ascent Guidance Equations, if 1 do not activate R29. | ||||||
| 12 |
FLPC. Bit is set to 1 in Ascent Guidance Equations when Time-to-go is less than 10 seconds. A 1 indicates that the pitch rate parameter is nulled, thereby releasing altitude control. Bit is assumed to be 0 in padload. A 0 indicates that the pitch rate parameter is a function of altitude and altitude rate. Bit is tested in guidance parameter computations. | ||||||
| 11 |
FLPI. Bit is set to 1 in P12 initialization (pre-launch computation) to use Ascent Guidance Equations as a subroutine. A 1 indicates that program sequence will return to P12. Bit is reset to 0 immediately upon return from Ascent Guidance Equations. A 0 indicates that normal Ascent Guidance operation will be continued (call FINDCDUW). Bit is tested in Ascent Guidance Equations before call to FINDCDUW. | ||||||
| 10 |
FLRCS. Bit is set to 1 when an engine cuts off while guidance is under control of Ascent Guidance Equations. A 1 indicates that the thrust-magnitude filter will be bypassed, and that the Ascent Guidance Equations will only be used to generate VGB. Bit is assumed to be 0 in padload. Bit is reset to 0 in P70, P71 initialization. A 0 indicates that the thrust-magnitude filter will be used (if ΔV is large enough), and that the normal mode of the guidance equations will be used. Bit is tested at the beginning of thrust-magnitude filter, and early in Ascent Guidance Equations. | ||||||
| 9 |
LETABORT. Bit is set to 1 in P63 after ignition, permitting the calling of the abort programs P70 and P71. Bit is rest to 0 during P68, prohibiting any subsequent call to P70 or P71. Bit is also reset to 0 after a TERMINATE or PROCEED response to the V16N85 display following injection, and at the beginning of P71. Bit is tested at the beginning of P70, P71. | ||||||
| 8 |
FLAP. This bit is examined by P71 in order to determine if it has been preceded by the P70 abort program. If P71 finds it set the abort will proceed using target initialization set up by P70. If P71 finds it reset then either P70 did not precede P71 or else the P70 target initialization had not been completed by the time P71 was selected. In this case, P71 performs the target initialization itself. P70 sets the bit to 1 when all target initialization is complete. P71 also sets the bit to 1 if it is required to do its own initialization but this has no real function. | ||||||
| 7 |
This bit is known to vary by Luminary
software version.
|
||||||
| 6 |
ROTFLAG. Bit is set to 1 by UPFLAG shortly after P70 or P71 is selected by pushbutton action or through DSKY entry. A 1 indicates that P70, P71 will force vehicle rotation in the preferred direction ("over-the-top" automatic attitude maneuver). If the LM altitude is less than 25K feet at the time of altitude check, the bit is reset to 0 when HDOT is greater than 40 fps (up). If the LM altitude is more than 25K feet at the time of altitude check, the bit is reset to 0 when the LM x-axis is within 90° of the desired LM x-axis, or the present LM x-axis is within 30° of the local vertical (up). A 0 indicates that P70, P71 will not force vehicle rotation in the preferred direction (vehicle rotation completed or the conditions stated above have been satisfied). The bit is used for branching during ABORT and/or ABORT STAGE ascent guidance. | ||||||
| 5 |
QUITFLAG. Set to 1 by extended Verb 96
(which then exits to P00) to indicate that integration
should be discontinued. Bit is examined by integration
routines which exit if the bit is 1. P00 state vector
integration is not performed if the bit is 1. Reset to
0 in P00 if it was found to be 1. Normal integration
processes resume as soon as a new program is selected via
V37. |
||||||
| 4 |
This bit is known to vary by Luminary
software version.
|
||||||
| 3 |
MID1FLAG. Bit set 1 to indicate that
MIDTOAV1 called integration. |
||||||
| 2 |
MIDAVFLG. Bit set 1 to indicate that integration was called by MIDTOAV1 or MIDTOAV2 (R41). Bit set 1 engages R41 logic. | ||||||
| 1 |
AVEMIDSW. Set to 1 to indicate that
synchronization of state vectors and W-Matrix is in progress
in the transition from powered flight to coasting flight and
that the powered flight state vector should not be
overwritten until the synchronization is completed. |
FLAGWORD 10. Bit assignments are as follows:
| Bit |
Meaning |
||||||
|---|---|---|---|---|---|---|---|
| 15 |
Not used. |
||||||
| 14 |
INTFLAG. A 1 indicates that some
program or routine has called INTSTALL and is presumably in
the process of integrating. Other programs calling
INTSTALL will wait until this bit is reset to 0. A 0
indicates that no program or routine is currently using
integration. Set 1 by INTSTALL. Set 0 by
INTWAKE. A hardware or software restart sets this bit
to 0. |
||||||
| 13 |
APSFLAG. Bit is set to 1 by the
astronaut in R03 (V48). Bit is set to 1 when entering
P68 (touchdown) or P71 (APS abort). Bit is also set 1
by P42. A 1 indicates that LM has staged or that it is
on the lunar surface. Bit is reset to 0 before launch
or by the astronaut in R03 (V48). A 0 indicates that
the descent stage is attached and that the LM is not on the
lunar surface. Bit is the only indicator of state and
is not changed by FRESH START. Bit is used in the
autopilot and in burn programs. |
||||||
| 12 |
Not used. |
||||||
| 11 |
Not used. |
||||||
| 10 |
Not used. |
||||||
| 9 |
Not used. |
||||||
| 8 |
Not used. |
||||||
| 7 |
REINTFLG. A 1 indicates that the
routine currently using INTSTALL is to be restarted. A
0 indicates that no restartable integration is in
progress. Programs which have restart points during
integration set this bit to 1. INTWAKE sets this bit
to 0. Bit is untouched by hardware restarts thus
retaining INTSTALL for restartable programs. |
||||||
| 6 |
Not used. |
||||||
| 5 |
Not used. | ||||||
| 4 |
Not used. | ||||||
| 3 |
Not used. | ||||||
| 2 |
This bit is known to vary by Luminary
software version.
|
||||||
| 1 |
This bit is known to vary by Luminary
software version.
|
FLAGWORD 11. Flagword 11 is used to control the operation
of R12, the Descent State Vector Update routine. Therefore,
its contents are only used during the programs P63 thru P66.
During all other programs, bit 15 is set, bits 14 thru 1 are
reset, and the contents of flagword 11 should be 400008.
The exception, bit 8, which can be set and reset by extended verb
57 and reset by extended verb 58, is normally switched during R12.
Flagword 11 is initialized to 400008 by R00, R11 (when
an abort is requested), and by a fresh start. Also set to
400008 whenever a POODOO abort occurs when Average-G is
running.
| Bit |
Meaning |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 |
LRBYPASS. Bit is reset to 0 by P63 to
permit R12 operation. R09, the "R10, R11, R12 service
monitor", checks LRBYPASS and when it is 0, R12 is
entered. When the bit is set to 1, R09 bypasses
R12. This bit is set to 1 by R00 (V37) or by an abort
(R11), insuring that R12 will be off when either P12, P70,
or P71 is called. |
||||||||||
| 14 |
This bit is known to vary by Luminary
software version.
|
||||||||||
| 13 |
This bit is known to vary by Luminary
software version.
|
||||||||||
| 12 |
VXINH. If the Z velocity component
fails to pass the data reasonability test, the bit is set to
1 and the X velocity component is not updated with landing
radar data. If the next velocity sample to pass the
reasonability test is not an X component, the bit is reset
to 0 and the data is accepted; X component data will be
rejected, and then the bit will be reset to 0. This
process prevents updating with questionable data caused by
cross lobe lock-up on the X component. |
||||||||||
| 11 |
PSTHIGAT. Bit is initially reset to
0. Bit is set to 1 when the criteria for repositioning
the landing radar antenna are first met, and indicates that
the antenna should be either repositioning or in position 2.
Bit remains set for the duration of the landing. |
||||||||||
| 10 |
NOLRREAD. Bit is set to 1 when PSTHIGAT
is set to 1, to prevent reading the landing radar while the
antenna is repositioning. Bit is reset to 0 after the
antenna achieves position 2 and allows further
readings. If the antenna does not achieve position 2,
and the astronaut chooses to proceed without R12 (i.e. V34E
response to flashing V05N09 alarm 00523), the bit will
remain set to 1 and therefore inhibit landing radar reading. |
||||||||||
| 9 |
XORFLG. Bit is set to 1 when the LM
estimated altitude first falls below 30K feet. At this
point, R12 inhibits X axis override in the digital
autopilot. Bit remains set to 1 for the duration of
the landing. Its purpose is to prevent R12 from
inhibiting X axis override. |
||||||||||
| 8 |
LRINH. This bit is initially reset to 0
by R00 allowing the landing radar data to be read and tested
but not incorporated into the state vector. The bit
may be set to 1 via extended verb 57, permitting landing
radar data incorporation into the state vector. It is
reset to 0 via extended verb 58. Bit may be reset to 0
after it has been set to 1 in V57. |
||||||||||
| 7 |
VELDATA. Bit is set to 1 by the landing
radar velocity read routine after a valid reading has been
made. A 1 indicates that a landing radar velocity
reading has been made and that the data is available.
Bit is reset to 0 by R12 after the data is used. Bit
has a limited value on the downlink because it is set and
reset at least once during a two second interval; and, due
to the fact that the downlink reads this bit at the same
point during each pass, it may read exactly the same (either
always set or always reset) on each pass. |
||||||||||
| 6 |
This bit is known to vary by Luminary
software version.
|
||||||||||
| 5 |
This bit is known to vary by Luminary
software version.
|
||||||||||
| 4 |
RNGEDATA. Bit is set to 1 by the
landing radar altitude read routine after a valid reading
has been made. A 1 indicates that a landing radar
altitude reading has been made and that data is
available. Bit is reset to 0 by R12 after the data is
used. Bit has a limited value on the downlink because
it is set and reset at least once during a two second
interval; and, due to the fact that the downlink reads this
bit at the same point during each pass, it may read exactly
the same (either always set or always reset) on each pass. |
||||||||||
| 3 |
This bit is known to vary by Luminary
software version.
|
||||||||||
| 2 |
VFLSHFLG. Bit is set to 1 when two or
more of the last four landing radar velocity readings
(including the current reading) have failed the landing
radar velocity data reasonability test. When bit is
set to 1, the landing radar velocity fail light will be
flashed by R09. Bit is reset to 0 when a velocity
reading passes the reasonability test. |
||||||||||
| 1 |
HFLSHFLG. Bit is set to 1 when two or more of the last four landing radar altitude readings (including the current reading) have failed the landing radar altitude data reasonability test. When bit is set to 1, the landing radar altitude fail light will be flashed by R09. Bit is reset to 0 when an altitude reading passes the reasonability test. |
DSPTABs. The eleven registers, DSPTAB through DSPTAB+10D,
indicate the status of the DSKY displays. If bit 15 through
12 are 0001, the next 11 bits will indicate the actual status of
the DSKY displays; if bits 15 through 12 are 1110, the next 11
bits indicate the "ones" complement of the status to which the LGC
will command the DSKY display. Bits 11-1 of DSPTAB+0 through
DSPTAB+10D are decoded as follows:
| Bit Assignments |
||||||
|---|---|---|---|---|---|---|
| DSPTAB Register |
|
Downlink Word No. |
|
Bit 11 |
Bits 10-6 |
Bits 5-1 |
| DSPTAB+0 |
45a |
-R3S |
R3D4 |
R3D5 |
||
| DSPTAB+1 | 45b |
+R3S |
R3D2 |
R3D3 |
||
| DSPTAB+2 | 46a |
R2D5 |
R3D1 |
|||
| DSPTAB+3 | 46b |
-R2S |
R2D3 |
R2D4 |
||
| DSPTAB+4 | 47a |
+R2S |
R2D1 |
R2D2 |
||
| DSPTAB+5 | 47b |
-R1S |
R1D4 |
R1D5 |
||
| DSPTAB+6 | 48a |
+R1S |
R1D2 |
R1D3 |
||
| DSPTAB+7 | 48b |
R1D1 |
||||
| DSPTAB+8D | 49a |
ND1 |
ND2 |
|||
| DSPTAB+9D | 49b |
VD1 |
VD2 |
|||
| DSPTAB+10D | 50a |
MD1 |
MD2 |
|||
R3D1 stands for digit one of the third register and VD1 stand for the first digit of the verb display, etc. For the right character of a pair, bit 5 is the MSB with bit 1 the LSB. For the left character of a pair, the MSB is bit 10 with bit 6 the LSB. Bit 11 of some of the DSPTABs contains discrete information, a one indicating that the discrete is on. For example, a one in bit 11 of DSPTAB+1 indicates that R3 has a plus sign. If the sign bits associated with a given register are both zeros, then the content of that particular register is octal; if either of the bits is set, the register content is decimal data.
The five bit codes associated with the digits are as follows:
|
|
MSB |
LSB |
|||
| 0 |
1 |
0 |
1 |
0 |
1 |
| 1 |
0 |
0 |
0 |
1 |
1 |
| 2 |
1 |
1 |
0 |
0 |
1 |
| 3 |
1 |
1 |
0 |
1 |
1 |
| 4 |
0 |
1 |
1 |
1 |
1 |
| 5 |
1 |
1 |
1 |
1 |
0 |
| 6 |
1 |
1 |
1 |
0 |
0 |
| 7 |
1 |
0 |
0 |
1 |
1 |
| 8 |
1 |
1 |
1 |
0 |
1 |
| 9 |
1 |
1 |
1 |
1 |
1 |
| Blank |
0 |
0 |
0 |
0 |
0 |
The following is a diagram of the DSKY face showing positions of the different digits:
Program
┌───────┬───────┐ │ MD1 │ MD2 │ └───────┴───────┘
Verb Noun
┌───────┬───────┐ ┌───────┬───────┐ │ VD1 │ VD2 │ │ ND1 │ ND2 │ └───────┴───────┘ └───────┴───────┘
Register 1
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R1D1 │ R1D2 │ R1D3 │ R1D4 │ R1D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
Register 2
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R2D1 │ R2D2 │ R2D3 │ R2D4 │ R2D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
Register 3
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R3D1 │ R3D2 │ R3D3 │ R3D4 │ R3D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
DSPTAB+11D. This register drives relays for the display
lights. The bit assignments are:
| Bit |
Assignment |
||||||
|---|---|---|---|---|---|---|---|
| 1 |
This bit differs by Lunar Module software
version.
|
||||||
| 2 |
This bit differs by Lunar Module software
version.
|
||||||
| 3 |
Landing Radar Velocity Fail |
||||||
| 4 |
No Attitude |
||||||
| 5 |
Landing Radar Altitude Fail |
||||||
| 6 |
Gimbal Lock |
||||||
| 7 |
|||||||
| 8 |
Tracker |
||||||
| 9 |
Program Caution |
If bits 15 through 12 of DSPTAB+11D are 1000, the last 11 bits
indicate the state to which the LGC will command the relays; if
bits 15 through 12 are 0000, the last 11 bits indicate the actual
state of the relays. A one indicates that the discrete is
on.
TIME2, TIME1. Double precision word indicating ground
elapsed time. Used for all timing while LGC is on.
Zeroed at liftoff (by crew procedure), increment by one bit per
centisecond. May be updated by V55 (R33), V25N36, V70 (P27),
or V73 (P27). Scaled centiseconds/228.
LM STATE VECTOR and TIME. The LGC's latest calculated state
vector for the LM in reference coordinates. The coordinates
may be either earth-centered or moon-centered; a zero in bit 11 of
flagword 8 (LMOONFLG) indicates earth-centered, a one indicates
moon-centered. Words 52-54 contain the position components
X, Y, Z scaled meters/229. Words 55-57 contain
the velocity components X, Y, Z scaled (meters/centisecond)/27.
Word 58 contains the time associated with the state vector scaled
centiseconds/228, referenced to the computer
clock. The scaling for position, velocity and time is the
same whether earth-centered or moon-centered. These
parameters are calculated whenever the LM state vector is
permanently extrapolated or changed as follows:
DESIRED BODY RATES (X, Y, Z). Desired automatic maneuver rates about body axes as given to the DAP. Calculated at the beginning of an automatic coasting flight maneuver (KALCMANU) and zeroed at the end. Recomputed every 2 seconds in powered flight when steering (FINDCDUW) is enabled. Scaled (radians/sec)/(π/4). Range is ±10 degrees/sec.
Garbage.
These downlink items are known to differ somewhat by Luminary
software version.
| Version |
Description |
||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Luminary 1, 1A, 1B, and 1C |
CADRFLSHs. A set of three single-precision erasable memory cells used to retain return address information from the display interface routine. CADRFLSH contains the FCADR of the last priority display request, CADRFLSH+1 the FCADR of the last mark/extended verb display, and CADRFLSH+2 contains the FCADR for the last normal display. Octal quantities. | ||||||||||||||||||||||||||||||||||||||||||||
| Luminary 1D |
As for CHAN77 (Channel 77): A computer output
channel, the individual bits of which are used to indicate
the source of a hardware restart. The channel is
initialized to 0 by a V36E (request fresh start).
The channel will be zeroed by the final V33E on a P27
state vector uplink and also by a crew or ground
V21N10E77EE. Should a hardware restart occur, one of
the bits in the channel should be set to 1 indicating the
source. If multiple restarts occur, more than one
bit could possibly be left set afterwards (i.e., if they
were different types). Many restarts of the same
type would leave just one bit set with the software REDO
COUNTER indicating the number. The bit definitions
are:
Note that a restart due to oscillator fail is not shown in this channel. |
||||||||||||||||||||||||||||||||||||||||||||
| Luminary 1E |
As for CHANBKUP: A single-precision erasable memory
cell used to bypass logic check of channel 30, bits 1, 4,
and 5. Displayed as R2 of NOUN 46 in R03.
|
FAILREG's, a set of three single-precision cells used to retain
alarm pattern code information. They are all reset to 0 by a
fresh start. FAILREG and FAILREG+1 are also reset to 0 by
use of the "ERROR RESET" keycode. FAILREG contains the first
alarm code received after the "ERROR RESET", FAILREG+1 contains
the second, and FAILREG+2 will always contain the most recent
alarm code. Octal quantities.
RADMODES. A flagword associated with radar modes. A
fresh start sets bits 7 and 2 to 1, sets bit 6 to the value of bit
6 of channel 33, and sets all other bits to 0.
| Bit |
Meaning |
|---|---|
| 15 |
CDESFLAG. Continuous Designate. A 1
means that commands are issued by the LGC to the Rendezvous
Radar without checking to see if lock-on is achieved.
A 0 indicates that the LGC checks for lock-on when
designating the antenna. Set to 1 by selection of the
continuous designate option of Verb 41, RR Coarse Align, and
RR Automatic Search Routine (R24). Set 0 by Verb 56
(Terminate Tracking), Verb 37 selection of P00, Verb 44
(Terminate RR Coarse Align), by answering the display (V16
N80) of R24, and by RR Monitor Routine (R25) if the RR mode
changes from LGC to manual or off, i.e., if the RR auto mode
discrete (Bit 2 of channel 33) changes from 0 to 1.
Also set 0 at the start of P20, P22, and P12. |
| 14 |
REMODFLG. Remode. A 1 means that a
change in the antenna mode has been requested or is in
progress. A 0 indicates that no remode is
requested. Set to 1 when the Radar Designate Routines
(R21, R24, Verb 41) determine that a designate may be
performed after a remode has been done, and by R21 when on
the lunar surface (in P22). Set to 0 by the remode
subroutine at the end of remoding and by Verb 56 or a Verb
37 request for another program and by R25 when the RR
auto-mode discrete changes from 0 to 1. Set to 1
by R29 before it calls the remode routine. |
| 13 |
RCDU0FLG. RR CDU Zero. A 1 means that
the RR CDUs are being zeroed. A 0 means that they are
not being zeroed. A 1 inhibits an RR CDU fail from
lighting the tracker fail light. Set to 1 by R25 when
the RR auto-mode discrete changes from off/manual to on, and
by Verb 40 with Noun 72. Set to 0 by the RR zero
subroutine at the end of the CDU zero, by Verb 56 or a Verb
37 request for another program and by a change in the RR
auto-mode discrete from 0 to 1. |
| 12 |
ANTENFLG. RR antenna mode. A zero means
the antenna is in Mode I, a 1 indicates Mode II. The
bit is set to the appropriate value by the RR turn-on
sequence in R25 after an RR CDU zero, by the remode
subroutine at the conclusion of a remode, and by a Verb 37
request for a new program. |
| 11 |
REPOSMON. Monitor Reposition. A 1 means
that an RR reposition is taking place. A 0 means that
no reposition is taking place. A 1 inhibits further
checking of the antenna gimbal limits by R25. When a
designate is possible and about to begin, a 1 in this bit
delays the designate until the reposition is
completed. If this bit is set to 1 during a designate
operation, the designate is terminated with an error return
(503 alarm). Set to 1 by the RR Monitor Routine (R25)
when it detects the antenna gimbal angles outside the limits
for the present mode. Set to 0 by the Reposition
Routine at the end of the reposition, by Verb 56 or a Verb
37 request for another program and by R25 when the RR
auto-mode discrete changes from on to off/manual. Set
to 1 at the start of antenna prepositioning in R29, set to 0
at the end of antenna prepositioning in R29. |
| 10 |
DESIGFLG. Designate. A 1 means that an
RR designate has been requested or is in progress. A 0
indicates that a designate has not been requested nor is one
in progress. Set to 1 at the start of a designate by
R21, R24 or verb 41. Set to 0 by Verb 44, by R21 when
the designate is completed, by R24 when the V16 N80 display
is answered, and by Verb 56. Set to 0 by SERVICER if
R29 if not allowed. Set to 0 by R29 when lock-on is
achieved in R29. Set to 0 by R29 before calling the
remode routine. Set to 1 at the beginning of R29 if
previously 0. Set to 0 by a Verb 37 request for a
program if R29 had been requested. Also set 0 at the
start of P20, P22 and P12. |
| 9 |
ALTSCALE. Landing Radar Altitude Scale.
A 1 means that the landing radar altitude reading is on the
high scale. A 0 means low scale. Set to the
value in channel 33 bit 9 by R04 and R77 and each time the
LR altitude is read. |
| 8 |
LRVELFLG. Landing Radar Velocity Data
Fail. A 1 means that landing radar velocity data could
not be read successfully. Set to the value in channel
33 bit 8 each time landing radar velocity data is
read. Set to 0 by pressing the error reset button on
the DSKY and by a lamp test. |
| 7 |
RCDUFAIL. No RR CDU Fail. A 1 means
that an RR CDU fail has not occurred. A 0 means one
has occurred. Set to the value in channel 30 bit 7
whenever the RR CDU fail discrete changes. Set to 1 by
an IMU turn-on sequence. Set to 1 by a fresh start or
a hardware restart. |
| 6 |
LRPOSFLG. Landing Radar Position. A 1
indicates LR position 2. A 0 indicates position
1. Set to 1 by Verb 59. Set to value of bit 6 of
channel 33 at start of R04/R77. Also set 1 by
R12. |
| 5 |
LRALTFLG. Landing Radar Altitude Data Fail. A 1 means that LR altitude data could not be read successfully. Set to the value in channel 33 bit 5 each time LR altitude data is read. Set to 0 by pressing the error reset button on the DSKY and by a lamp test. |
| 4 |
RRDATAFL. RR Data Fail. A 1 means that
RR data could not be read successfully. Set to the
value in channel 33 bit 4 each time RR data is read.
Set to 0 by pressing the error reset button on the DSKY, and
by a lamp test. |
| 3 |
RRRSFLAG. RR Range Scale. A 1 indicates
the RR range reading is on the high scale. A 0
indicates low scale. Set to the value in channel 33
bit 3 by R22 prior to reading RR range, and also set by R22
when a scale change is detected. Set to value of bit 3
of channel 33 at start of R04/R77. |
| 2 |
AUTOMODE. RR Auto Mode. A 1 means that
RR is not in the auto mode; i.e., the RR auto mode discrete
is not present. A 0 means the RR is in the auto
mode. Set to the appropriate value by R25 when a
change occurs in the RR auto mode discrete (channel 33 bit
2). Set to 1 by an IMU turn-on sequence. Set to
1 by a fresh start or hardware restart. |
| 1 |
TURNONFL. RR Turn-On. A 1 indicates
than an RR turn-on sequence (zero the RR CDUs and establish
the antenna mode) is in progress. A 0 means that no RR
turn-on sequence is in progress. Set to 1 by R25 when
the RR auto mode discrete changes from off/manual to
auto. Set to 0 at the termination of the turn-on
sequence. |
DAPBOOLS. A flagword associated with the DAP. A fresh
start sets DAPBOOLS to 213228.
| Bit |
Name |
1 Meaning |
0 Meaning |
|---|---|---|---|
| 15 |
PULSES, PULSEFLG |
Minimum impulse command mode. |
Not in minimum impulse command mode. |
| 14 |
USEQRJTS, USEQRFLG |
Gimbal unusable. Use jets only. |
Gimbal may be used. |
| 13 |
CSMDOCKED, CSMDKFLG |
CSM-DOCKED (Use backup DAP) |
CSM not docked. |
| 12 |
OURRCBIT, OURRCFLG |
Still in rate command |
Not in rate command. |
| 11 |
ACC4OR2X, ACC4-2FL |
4-Jet X-Axis translation requested |
2-Jet X-Axis translation requested. |
| 10 |
AORBTRAN, AORBTFLG |
B-System for X-translation |
A-System for X-translation. |
| 9 |
LPDPHASE (XOVINHIB), XOVINFLG |
In LPD Phase (X-Axis override locked out). |
Not in LPD Phase. |
| 8 |
DRIFTBIT, DRIFTDFL |
Assume zero offset. Drifting Flight. |
Offset acceleration likely (DPS, APS). |
| 7 |
RHCSCALE, RHCSCFLG |
Normal RHC scaling requested. |
Fine RHC scaling requested. |
| 6 |
ULLAGER, ULLAGFLG |
Internal Ullage request |
No internal ullage request. |
| 5-4 |
DBSL2FLG, DBSELECT, DBSELFLG |
These bits are used
together to indicate astronaut-chosen deadband (5°, 1° or
0.3°). |
|
| 3 |
ACCSOKAY, ACCOKFLG |
Computed accelerations probably correct. |
Computed accelerations probably incorrect. |
| 2-1 |
AUTORATE2, AUTORATE1 (AUTR2FLG, AUTR1FLG) |
These bits are used
together to indicate astronaut-chosen KALCMANU maneuver
rates. |
|
OGC, IGC, MGC. The X, Y, and Z gyro torquing angles computed in CALCGTA in P52, P57; counted down as gyros are torqued. During coarse align in CALCGA in P52, P57 the desired gimbal angles. Scaled degrees/360.
STAR IDs. 68a contains the star I.D. for the sighting
vector in words 69-71. 68b contains the star I.D. for the
sighting vector in words 72-74. Set during PICAPAR and after
astronaut changes star number. These I.D.s will be the LGC
catalogue number (Refer to Control Data section of this GSOP)
multiplied by six. Scaled 2-14.
STAR SIGHTING VECTOR 1 (STARSAV1). During P52, P51 and
Technique 2 of P57 STARSAV1 contains the 1st optics sighting
vector. During Technique 0 of P57 it contains the Y
spacecraft axis and the gravity vector during techniques 1 and
3. In stable member coordinates. Scaled 2-1.
These words are known to vary by Luminary software version.
| Version |
Description |
|---|---|
| Luminary 1, 1A, 1B, 1C |
|
| Luminary 1D, 1E |
|
ACTUAL RR SHAFT CDU. RR shaft angle CDU counter.
Defines RR antenna position (along with trunnion angle).
Updated from RR CDUs as shaft angle changes. This register
is an unsigned 15-bit fraction. The quantity is scaled
degrees/360.
LM MASS. Current mass of the LM. First part of Noun
47. A buffered quantity that is determined by MASS (and
CSMMASS when desired). Pad-loaded. Can also be loaded
by crew via R03 (Verb 48 — DAP Data Load); R03 then determines
MASS on the basis of LEMMASS (and CSMMASS when docked). The
1/ACCS Routine, which is called every 2 seconds during powered
flight, determines LEMMASS from MASS (MASS is decremented as a
function of acceleration). Scaled kilograms/216.
CSM MASS. Current mass of the CSM. Used in the computation of the RCS and GTS control authorities when the LM is docked to the CSM. Second half of Noun 47. Pad-loaded. Can also be loaded by crew via R03 (Verb 48 — DAP Data Load). Scaled kilograms/216.
IMODES30. A flagword which monitors IMU conditions.
Set to 374118 by a fresh start. A restart sets
bits 14, 13, 12, 11, 10 to 1, sets bits 15, 8, 7, 6, 2 to 0 and
preserves bits 9, 5, 4, 3, 1. Updated every 0.48 second by
T4RUPT program.
| Bit |
Meaning |
|---|---|
| 15 |
Value of bit 15 of channel 30. A 0
indicates stable member temperature within design limits. |
| 14 |
Value of bit 14 of channel 30. A 0
indicates ISS has been turned on or commanded to be turned
on. Bit is set 1 by a fresh start or a restart. |
| 13 |
Value of bit 13 of channel 30. A 0
indicates an IMU fail indication has been produced. If
this bit becomes 0 while bit 4 of this word is also 0, bit 1
of channel 11 (ISS warning) is set 1. |
| 12 |
Value of bit 12 of channel 30. A 0
indicates IMU CDU fail indication has been produced.
If this bit becomes 0 while bit 3 of this word is also 0,
bit 1 of channel 11 (ISS warning) is set 1. |
| 11 |
Value of bit 11 of channel 30. A 0
indicates an IMU cage command has been generated by the
crew. |
| 10 |
Value of bit 13 of channel 33. A 0
indicates a PIPA fail indication has been produced.
This bit has the same value as bit 13 of IMODES33. Set
1 if an error reset key code is received (DSKY or
uplink). If this bit becomes 0 while bit 1 of this
word is also 0, bit 1 of channel 11 (ISS warning) is set 1. |
| 9 |
Value of bit 9 of channel 30. A 0
indicates IMU turned on and operating with no
malfunctions. If bit becomes 1 while IMUSE (bit 8 of
flagword 0) is 1, alarm 02148 will be generated. |
| 8 |
Used to control sequencing of IMU
turn-on. Set 1 if bit 7 of this word is 1 and reset
zero 0.48 second later, before the IMU turn-on sequencing is
started. Used to achieve a 0.48-second wait before
acting on IMU turn-on information. |
| 7 |
Used to control sequencing of IMU turn-on,
set 1 based on values of bits 14, 9 and 2 of this
word. Reset zero 0.48 second later. Can be set 1
if ISS initialization requested since last fresh start, IMU
turn-off, or turn-on delay complete. |
| 6 |
A 1 indicates that IMU initialization is
being carried out. Set 1 during turn-on sequence, if a
cage command is received, or if IMU zeroing is done in
T4RUPT. Set 0 about 10.56 seconds after cage command
removed, 10.56 seconds after start of zeroing in T4RUPT, or
about 100 seconds after start of turn-on sequence. If
bit is 1, verb 37 input will not be processed (alarm 15208
will be generated). If bit is 1, an error exit will be
forced from the internal IMU routines. |
| 5 |
Set to 1 to inhibit the generation of alarm
02128 if a PIPA fail signal occurs. Not
used unless bit 1 of this word is 1. Set 1 during IMU
turn-on sequence and reset 0 about 4 seconds after bit 6 is
reset 0. (If bit 10 of this word is 0, an alarm will
be generated when Average-G is stopped regardless of the
value of bit 5.) |
| 4 |
Set to 1 to inhibit generation of an ISS
warning based on receipt of an IMU fail signal. Reset
0 when bit 6 is set 0. Set 1 when IMU coarse align
started and set 0 about 5.12 seconds after mode change to
fine align. Set 1 for 10.56 seconds when IMU CDU zero
commanded. |
| 3 |
Set to 1 to inhibit generation of an ISS
warning based on receipt of an IMU fail signal. Set 1
when bit 6 of this word is set 1 and set 0 when bit 6 is set
0. Also set 1 for 10.56 seconds when IMU CDU zero is
commanded separate from T4RUPT package (by V40N20 or
prelaunch or IMU tests). |
| 2 |
Set to 1 to indicate failure of the IMU
turn-on delay sequence (alarm 02078 will also be
generated). |
| 1 |
Set to 1 to inhibit generation of an ISS
warning based on receipt of a PIPA fail signal. Bit
set 1 when bit 6 of this word is set 1. Bit set 0 when
Average-G started and set 1 when Average-G ends. |
IMODES33. A flagword which monitors various channel 32,
channel 33, and IMU conditions. Also monitors Verb 35 "lamp
test". Set to 160408 by a fresh start. Set to
160008 + the contents of bit 6 by a restart. An
error reset key code sets bits 13, 12, and 11 to 1 and does not
affect other bits. Updated every 0.48 second by T4RUPT
program except for bit 14 which is updated every 0.12 second.
| Bit |
Meaning |
|---|---|
| 15 |
Not used. |
| 14 |
Value of bit 14 of channel 32. A 0
indicates Proceed Key depressed. A change from a 1 to
a 0 will cause a job to be established that has the same
program logic effect as Verb 33. It should be noted
that in the case of a response to a V21, V22 and V23, the
logic for a Proceed is not the same as for a V33E. |
| 13 |
Value of bit 13 of channel 33. A 0
indicates a PIPA fail signal. This bit has the same
value as bit 10 of IMODES30. |
| 12 |
Value of bit 12 of channel 33. A 0
indicates downlink end pulse rate greater than 100
pps. If this bit changes from 1 to 0, alarm 11058
is generated. |
| 11 |
Value of bit 11 of channel 33. A 0
indicates uplink rate greater than 6.4K pps. If this
bit changes from 1 to 0, alarm 11068 is
generated. |
| 10 |
Not used. |
| 9 |
Not used. |
| 8 |
Set to 1 when R10 routine is initialized
during the powered descent trajectory. A 1 in this bit
causes the display inertial data discrete to be sent to the
RR CDUs (bit 8 set in channel 12) and the RR error counter
to be enabled (bit 2 set in channel 12). A 0 in this
bit causes the display inertial data discrete to be removed
from the RR CDUs and the RR error counter to be disabled if
R10 was terminated during the descent trajectory.
However, if R10 was terminated and/or restarted while in
ascent bits 2 and 8 of channel 12 are left unchanged. |
| 7 |
A switch employed in R10 for alternate
computations of altitude rate and altitude (bit 2 of channel
14 tells which is which). A 0 forces a program branch
to compute and display altitude rate; bit is then set to 1
to compute and display altitude on next pass thru R10.
Bit then set 0, etc. |
| 6 |
Set to 1 to indicate that IMU should not be
used for vehicle attitude information. Bit checked
every 0.1 second by autopilot. Bit set 1 the same time
as bit 6 of IMODES30 and also when bit 4 of IMODES30 is set
1 (for IMU zeroing external to T4RUPT and for IMU coarse
align). Bit set 0 if IMU fine align routine is
performed. Bit set 1 if IMU turned off. |
| 5 |
Set to 1 in IMU zeroing routine external to
T4RUPT (by V40N20 or prelaunch or IMU tests). Remains
set to 1 for an interval of about 10.56 seconds while
zeroing taking place. Bit 6 of this word is set to 1
at the same time as bit 5. |
| 4 |
Not used. |
| 3 |
Not used. |
| 2 |
Not used. |
| 1 |
Set to 1 when Verb 35 "lamp test" is
received. Reset to 0 about 5 seconds later. A 1
inhibits resetting of lights to 0 in T4RUPT during lamp
test. |
CURRENT BODY RATES (X, Y, Z). Estimated current rates about
body axis. Calculated at the beginning of every DAP cycle
every 0.1 sec. Zeroed at DAP start-up. Scaled
(degrees/sec)/45. Expected range of ±10 degrees/sec but ±45
degrees/sec is possible.
Garbage.
DAP INTERNAL DESIRED CDUs (X, Y, Z). Outer, inner and
middle intermediate desired gimbal angles. Steering commands
to DAP. Generated during a burn by guidance equations or
during an automatic maneuver. Calculated every 2 secs during
a PGNCS controlled burn (i.e., P40, P42). Updated every 0.1
sec by the DAP (using DELCDUs) during an automatic maneuver
(KALCMANU) and also during powered flight. These registers
are unsigned 15-bit fractions. Scaled degrees/360.
Garbage.
ACTUAL CDUs (X, Y, Z). The current outer, inner and middle
IMU gimbal angles. Automatically updated by the hardware
when the IMU is on. These registers are unsigned 15-bit
fractions. Scaled degrees/360.
ACTUAL RR TRUNNION CDU. RR trunnion angle CDU
counter. Defines the RR antenna position (along with shaft
angle). Updated from RR CDUs as trunnion angle
changes. This register is an unsigned 15-bit fraction.
Scaled degrees/360.
These words are known to differ by Luminary software version.
| Version |
Description |
| Luminary 1, 1A, 1B, 1C, 1D |
Y, Z MOMENT OFFSETS. Calculated angular acceleration about Y and Z body axes due to the fact that the main engine is not exactly aligned with the center of gravity. During powered flight these are calculated every 0.1 second at the beginning of the DAP cycle; otherwise these are zeroed in every DAP cycle. Also zeroed at discrete times, such as fresh start and engine off. Scaled (degrees/second2)/90. Expected range is ±35 degrees/second2. |
| Luminary 1E |
CH5MASK, CH6MASK. Flagwords whose bits correspond to the bits of channel 5 and channel 6 respectively. Only bits 1-8 are used. When a bit is set, the autopilot regards the corresponding jet as being disabled. The bits are set and cleared either automatically in response to changes in the LGC Thruster Pair Command Switches (channel 32/bits 1-8), or manually via the DSKY. |
POSTORKP. Running sum of positive torque about control axis P. Calculated every 0.1 second when DAP is running. Scaled jetseconds/32.
NEGTORKP. Running sum (always positive) of negative torque
about control axis P. Calculated every 0.1 second when DAP
is running. Scaled jetseconds/32.
CHANNEL 11. Output channel. Bits are used to control
engine on/off and for display parameter quantities. Set 0 by
a fresh start. A restart zeroes all output channels by
hardware means. The program associated with restart or
processing of a V37 program change preserves the value of bits 14,
13, and 1 and sets remaining bits to 0. A restart then sets
bit 13 to 1 if ENGONFLG (bit 7 of flagword 5) is 1 and sets bit 14
to 1 if ENGONFLG is 0.
| Bit |
Meaning |
|---|---|
| 15 |
Not used. |
| 14-13 |
Engine on-off.
A 1 in bit 14 and a 0 in bit 13 turns off the descent
(ascent) engine. A 0 in bit 14 and a 1 in bit 13 turns
on the descent (ascent) engine. All other combinations
are ignored. |
| 12-11 |
Not used. |
| 10 |
Caution Reset signal (for display system
lights). A 1 indicates an Error Reset Key code (uplink
or DSKY) has been received. |
| 9 |
Used in hybrid simulation only. |
| 8 |
Not used |
| 7 |
Operator Error Light. Set to 0 when an
Error Reset Key code (uplink or DSKY) is received. Set
to 1 if various procedures (mainly DSKY, such as illegal
noun/verb combinations) are not performed properly. |
| 6 |
Flash verb and noun lights. Set 1 to
indicate that an operator action is required. |
| 5 |
Key Release light. Set 1 if program
desires to use display system but external (DSKY or uplink)
use of it is being made. Also would be set to 1 if an
internal or externally initiated monitor display (e.g. verb
16) had been started and then some DSKY button (except error
reset) was depressed. (It is lit if a request for
operator response has been initiated and crew does not
respond directly to it, but instead displays something
else.) Set 0 by key release keyboard input, and upon
other instances (such as processing of an extended verb, or
at the end of a V37 request) when display system is released
by the internal program. |
| 4 |
Temperature Caution light. A 0
indicates stable member temperature within design limits. |
| 3 |
Uplink Activity light. A 1 indicates an
uplink interrupt has been received. Reset 0 when an
error reset key code is received, a key release key code is
received, or at the end of P27 (based on receipt of a
"proceed" or "terminate" response). |
| 2 |
Computer Activity light. A 0 indicates
no active "jobs" are to be performed. Normally 0
during P00 except during the periodic state vector update or
gyro compensation. Bit is not set 1 if a "task" is
performed, but retains its previous value. |
| 1 |
ISS Warning light. A 1 indicates an IMU
fail indication or an IMU CDU fail indication or a PIPA fail
indication has been received. Setting of this bit may
be inhibited (see bits 4, 3, and 1 of IMODES30). |
CHANNEL 12. Output channel. Bits are used for control
of the rendezvous radar and IMU CDUs. Set 0 by a fresh
start. A restart preserves bits 14, 12, 11, 10, 9, 6, 5, 4
and sets remaining bits to 0. Set 0 by a hardware restart.
| Bit |
Meaning |
|---|---|
| 15 |
ISS turn-on delay complete. Set 1 at
end of 90 second ISS turn-on delay and rest 0 about 10.24
seconds later. |
| 14 |
Rendezvous radar enable. A 1 in this
bit enables rendezvous radar range and angle trackers to
acquire target (lock on). Set 1 when rendezvous radar
antenna is within 0.5° of target. |
| 13 |
Landing radar position command. If this
bit is set 1 and the antenna position switch is in LGC
position, the LR antenna will move to position 2
(Hover). Removing the discrete will not return the
antenna to position 1. |
| 12* | Minus roll gimbal trim. A 1 in this bit
will cause the descent engine to rotate positively about the
+Z axis causing the vehicle to rotate negatively about the
+Z axis if the engine is thrusting. *This bit will issue commands of opposite polarity to the names. (Missile vs gimbal polarity problem). |
| 11* |
Plus roll gimbal trim. A 1 in this bit
will cause the descent engine to rotate negatively about the
+Z axis causing the vehicle to rotate positively about the
+Z axis if the engine is thrusting. *This bit will issue commands of opposite polarity to the names. (Missile vs gimbal polarity problem). |
| 10* |
Minus pitch gimbal trim. A 1 in this
bit will cause the descent engine to rotate positively about
the +Y axis causing the vehicle to rotate negatively about
the +Y axis if the engine is thrusting. *This bit will issue commands of opposite polarity to the names. (Missile vs gimbal polarity problem). |
| 9 |
Plus pitch gimbal trim. A 1 in this bit
will cause the descent engine to rotate negatively about the
+Y axis causing the vehicle to rotate positively about the
+Y axis if the engine is thrusting. *This bit will issue commands of opposite polarity to the names. (Missile vs gimbal polarity problem). |
| 8 |
Display inertial data. A 1 in this bit
commands the rendezvous radar CDU DACs to switch to the
forward and lateral velocity meters during landing. |
| 7 |
Not used. |
| 6 |
Enable IMU CDU error counters. Set to 1
during coarse align of IMU, and in order to permit output of
error information to the FDAI attitude error needles (bit is
set to 0 on initialization pass, then set to 1; the third
pass is the first one with output to needles). |
| 5 |
Zero IMU CDUs. A 1 in this bit permits
the IMU CDUs to be zeroed. Bit set 1 at the same time
as bit 4 of this channel when bit 6 of IMODES30 is set to 1
(IMU initialization) and reset 0 about 10.24 seconds before
bit 6 of IMODES30 is reset 0. |
| 4 |
Enable IMU coarse align. Set 1 to
specify IMU coarse align. Also set 1 if middle gimbal
angle exceeds 85°. |
| 3 |
Not used. |
| 2 |
Enable rendezvous radar error counter.
A 1 in this bit during designate causes error counter to be
loaded with appropriate rate commands to drive
antenna. If display inertial data bit (bit 8 of this
channel) is 1, a 1 enables error counter for driving
inertial velocity display meter. |
| 1 |
Zero rendezvous radar CDUs. A 1 in this
bit zeroes the CDUs. |
CHANNEL 13. Output channel. Bits are used for various
purposes. Set 0 by a fresh start. A restart or V37
sets bit 12 to 1, preserves bits 15-13 and 7-5 and sets remaining
bits to 0. Set 0 by a hardware restart.
| Bit |
Meaning |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 |
When this bit is set 1, an internal computer
clock (TIME6) may be counted down at a 1600 pps rate.
This clock is used to control jet on-times. Bit is
reset to 0 by auto-pilot when no timed firings are being
commanded. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 |
Used in association with program interrupt
#10. Should always appear as 0. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 13 |
Used in association with program interrupt #10. Should always appear as 0. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 |
Used in association with program interrupt #10. Should always appear as 0. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 11 |
Enable standby. Set 1 at end of P06 to
enable the "PRO" button to put the computer into a period of
low power operation. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 10 |
Test DSKY lights. Set 0 if an error
reset keycode is received. Set 1 (for about 5 seconds)
if a V35 input received. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 9 |
Start "read" of rotational hand
controller. A 1 in this bit (together with a 1 in bit
8) starts a sequence which allows all the hand controller
angles to be read into the counters. Bit reset 0 when
hand controllers are read. Should not be set
more than 30 times/sec. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 8 |
Rotational hand controller counter
enable. A 1 in this bit allows the hand controller
counters to receive inputs. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 7 |
Telemetry word order code bit. Will
have a value of 1 (0 for words 1 and 51 only) when channel
is telemetered. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 6 |
Block inputs to uplink register. Not
set by program. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5 |
Not used. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 |
Radar activity. A 1 in this bit starts
a sequence which reads the rendezvous radar or landing radar
parameter selected by bits 3-1. Bit set 0 when
sequence is finished, and a radar rupt is generated by the
hardware. |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3-1 |
These three bits
select the radar parameter to be read as follows:
|
CHANNEL 14. Output channel. Bits are used for control of
computer counter registers. Set 0 by fresh start. A
restart or V37 preserves bit 6 and sets remaining bits to 0.
Caging command zeroes bits 15-6. Set 0 by a hardware reset.
| Bit |
Meaning |
||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 |
A 1 in this bit causes output pulses from
register used to drive X-axis IMU CDU error counter.
(IMU X-axis coarse align mode or error needles for yaw axis
in FDAI mode). |
||||||||||||||||
| 14 |
A 1 in this bit causes output pulses from
register used to drive Y-axis IMU CDU error counter.
(IMU Y-axis coarse align mode or error needles for pitch
axis in FDAI mode). |
||||||||||||||||
| 13 |
A 1 in this bit causes output pulses from register used to drive Z-axis IMU CDU error counter. (IMU Z-axis coarse align mode or error needles for roll axis in FDAI mode). | ||||||||||||||||
| 12 |
A 1 in this bit causes output pulses from the
register used to drive rendezvous radar trunnion or lateral
horizontal velocity meter depending on the mode of
operation. Reset 0 after counter register reduced to 0
(3200 pps). |
||||||||||||||||
| 11 |
A 1 in this bit causes output pulses from the register used to drive radar shaft or forward velocity meter depending on the mode of operation. Reset 0 after counter register reduced to 0 (3200 pps). | ||||||||||||||||
| 10 |
A 1 in this bit generates gyro torquing
pulses. Set 1 when pulse torquing of gyros performed
(for IMU compensation or for pulse torquing in P52 or P57
following acceptance of V06N93 display and for ENTR to 000138
checklist). Also set 1 in P57 following coarse
alignment after the N22 display. Reset 0 when required
number of pulses have been produced. |
||||||||||||||||
| 9 |
A 1 in this bit indicates negative gyro
torquing required (otherwise, torquing is positive).
Reset 0 after completion of routine. |
||||||||||||||||
| 8-7 |
These bits indicate the axis for gyro
compensation (in the sequence Y, Z, X for inner, middle,
outer). Program resets to 002 when
finished.
|
||||||||||||||||
| 6 |
A 1 in this bit enables gyro torquing power
supply. Set 1 at beginning of routine to generate gyro
torquing pulses; remains 1 unless a fresh start done or a
caging command. |
||||||||||||||||
| 5 |
Not used. |
||||||||||||||||
| 4 |
Thrust drive activity. A 1 in this bit
causes output engine pulses from the register used to
throttle the engine. Bit reset 0 after counter
register reduced to 0 (3200 pps). |
||||||||||||||||
| 3 |
Altitude meter activity. A 1 in this
bit causes the contents of the altitude counter to be
shifted out serially to either the altitude rate meter or
the altitude meter depending on the setting of bit 2.
Bit reset 0 after shifting is completed. |
||||||||||||||||
| 2 |
Altitude rate select. A 1 in this bit
causes the contents of the altitude counter register to be
shifted out to the altitude rate meter. If this bit is
0 the contents will be shifted out to the altitude meter
when bit 3 is set 1. This bit should alternatively be
set 1 and 0 for smooth meter driving. |
||||||||||||||||
| 1 |
Not used. |
| NOTE: |
For channel 30, the logic is inverted, i.e.,
0 is considered "set" and 1 is considered "cleared." |
CHANNEL 30. Input channel. Bits are used for various
purposes.
| Bit |
Meaning |
|---|---|
| 15 |
A 0 indicates stable member temperature
within design limits. |
| 14 |
A 0 indicates ISS has been turned on or
commanded to be turned on. |
| 13 |
A 0 indicates an IMU fail indication has been
produced. |
| 12 |
A 0 indicates an IMU CDU fail indication has
been produced. |
| 11 |
A 0 indicates an IMU cage command has been
generated by the crew. |
| 10 |
A 0 indicates G&N system is in control of
S/C. |
| 9 |
A 0 indicates IMU turned on and operating
with no malfunctions. |
| 8 |
Not used. |
| 7 |
A 0 indicates a rendezvous radar CDU fail
indication has been produced. |
| 6 |
A 0 indicates a display of inertial data
signal has been produced. |
| 5 |
A 0 indicates an auto throttle control signal
has been produced. |
| 4 |
A 0 indicates an abort stage signal has been
produced (abort with ascent stage). |
| 3 |
A 0 indicates an engine armed signal has been
produced. |
| 2 |
A 0 indicates a stage verify signal has been produced (descent stage attached). |
| 1 |
A 0 indicates an abort signal has been
produced (abort with descent stage). |
| NOTE: |
For channel 30, the logic is inverted, i.e.,
0 is considered "set" and 1 is considered "cleared." |
CHANNEL 31. Inputs from crew control devices, used by DAP.
| Bit |
Meaning |
|---|---|
| 15 |
A 0 indicates an attitude control out detent
signal has been produced (from attitude control assembly). |
| 14 |
A 0 indicates auto stabilization mode has
been selected. |
| 13 |
A 0 indicates attitude hold mode has been
selected. |
| 12 |
A 0 indicates translation in -Z direction has
been commanded. |
| 11 |
A 0 indicates translation in +Z direction has been commanded. |
| 10 |
A 0 indicates translation in -Y direction has been commanded. |
| 9 |
A 0 indicates translation in +Y direction has been commanded. |
| 8 |
A 0 indicates translation in -X direction has been commanded. |
| 7 |
A 0 indicates translation in +X direction has been commanded. |
| 6 |
A 0 indicates rotation in negative roll
direction (minimum impulse), or a negative azimuth direction
has been commanded. |
| 5 |
A 0 indicates rotation in positive roll
direction (minimum impulse), or a positive azimuth direction
has been commanded. |
| 4 |
A 0 indicates rotation in negative yaw direction (minimum impulse) has been commanded. |
| 3 |
A 0 indicates rotation in positive yaw direction (minimum impulse) has been commanded. |
| 2 |
A 0 indicates rotation in negative pitch direction (minimum impulse) has been commanded, or a negative elevation direction has been commanded. |
| 1 |
A 0 indicates rotation in positive pitch direction (minimum impulse) has been commanded, or a positive elevation direction has been commanded. |
| NOTE: |
For channel 30, the logic is inverted, i.e.,
0 is considered "set" and 1 is considered "cleared." |
CHANNEL 32. Input channel. Additional crew input to
DAP, etc.
| Bit |
Meaning |
|---|---|
| 15 |
Not used. |
| 14 |
A 0 indicates "proceed key" is depressed. |
| 13 |
Not used. |
| 12 |
Not used. |
| 11 |
Not used. |
| 10 |
A 0 indicates an apparent gimbal fail signal
has been produced. |
| 9 |
A 0 indicates a gimbal off signal has been
produced. |
| 8 |
A 0 indicates a thruster 10&11 fail
signal has been produced. |
| 7 |
A 0 indicates a thruster 9&12 fail signal
has been produced. |
| 6 |
A 0 indicates a thruster 13&15 fail signal has been produced. |
| 5 |
A 0 indicates a thruster 14&16 fail signal has been produced. |
| 4 |
A 0 indicates a thruster 6&7 fail signal has been produced. |
| 3 |
A 0 indicates a thruster 1&3 fail signal has been produced. |
| 2 |
A 0 indicates a thruster 5&8 fail signal has been produced. |
| 1 |
A 0 indicates a thruster 2&4 fail signal has been produced. |
| NOTE: |
For channel 30, the logic is inverted, i.e.,
0 is considered "set" and 1 is considered "cleared." |
CHANNEL 33. Input channel. Bits are used for hardware
status and command information. Bits 15-11 are "flip-flop"
bits (reset by a channel "write" command). They are reset in
the T4RUPT loop every 0.48 second. They are also reset by a
restart.
| Bit |
Meaning |
|---|---|
| 15 |
A 0 indicates the LGC oscillator has stopped. |
| 14 |
A 0 indicates repeated presence of the
following alarms: restart, counter fail, voltage fail
(standby mode), and scaler double alarm. An alarm test
will also turn it on. |
| 13 |
A 0 indicates one of the following: no
pulses have arrived from a PIPA during a 312.5 μsec. period;
both a + and a - pulse occurred simultaneously; only + (-)
pulses occurred for a period greater than 1.28 seconds. |
| 12 |
A 0 indicates downlink end pulses occurred at
a rate greater than 100 pps. |
| 11 |
A 0 indicates uplink rate is greater than
6.4K pps. |
| 10 |
This bit is always 1 since the block uplink
signal is wired in accept position. |
| 9 |
A 0 indicates a landing radar range low scale
signal has been produced. |
| 8 |
A 0 indicates a landing velocity good signal has been produced. |
| 7 |
A 0 indicates a landing radar position #2 signal has been produced. |
| 6 |
A 0 indicates a landing radar position #1 signal has been produced. |
| 5 |
A 0 indicates a landing radar range data good signal has been produced. |
| 4 |
A 0 indicates a rendezvous radar data good
signal has been produced. |
| 3 |
A 0 indicates a rendezvous radar range low
scale signal has been produced. |
| 2 |
A 0 indicates a rendezvous radar power on
auto signal has been produced. |
| 1 |
Not used. |
DSPTABs. The eleven registers, DSPTAB through DSPTAB+10D,
indicate the status of the DSKY displays. If bit 15 through
12 are 0001, the next 11 bits will indicate the actual status of
the DSKY displays; if bits 15 through 12 are 1110, the next 11
bits indicate the "ones" complement of the status to which the LGC
will command the DSKY display. Bits 11-1 of DSPTAB+0 through
DSPTAB+10D are decoded as follows:
| Bit Assignments |
||||||
|---|---|---|---|---|---|---|
| DSPTAB Register |
|
Downlink Word No. |
|
Bit 11 |
Bits 10-6 |
Bits 5-1 |
| DSPTAB+0 |
45a |
-R3S |
R3D4 |
R3D5 |
||
| DSPTAB+1 | 45b |
+R3S |
R3D2 |
R3D3 |
||
| DSPTAB+2 | 46a |
R2D5 |
R3D1 |
|||
| DSPTAB+3 | 46b |
-R2S |
R2D3 |
R2D4 |
||
| DSPTAB+4 | 47a |
+R2S |
R2D1 |
R2D2 |
||
| DSPTAB+5 | 47b |
-R1S |
R1D4 |
R1D5 |
||
| DSPTAB+6 | 48a |
+R1S |
R1D2 |
R1D3 |
||
| DSPTAB+7 | 48b |
R1D1 |
||||
| DSPTAB+8D | 49a |
ND1 |
ND2 |
|||
| DSPTAB+9D | 49b |
VD1 |
VD2 |
|||
| DSPTAB+10D | 50a |
MD1 |
MD2 |
|||
R3D1 stands for digit one of the third register and VD1 stand for the first digit of the verb display, etc. For the right character of a pair, bit 5 is the MSB with bit 1 the LSB. For the left character of a pair, the MSB is bit 10 with bit 6 the LSB. Bit 11 of some of the DSPTABs contains discrete information, a one indicating that the discrete is on. For example, a one in bit 11 of DSPTAB+1 indicates that R3 has a plus sign. If the sign bits associated with a given register are both zeros, then the content of that particular register is octal; if either of the bits is set, the register content is decimal data.
The five bit codes associated with the digits are as follows:
|
|
MSB |
LSB |
|||
| 0 |
1 |
0 |
1 |
0 |
1 |
| 1 |
0 |
0 |
0 |
1 |
1 |
| 2 |
1 |
1 |
0 |
0 |
1 |
| 3 |
1 |
1 |
0 |
1 |
1 |
| 4 |
0 |
1 |
1 |
1 |
1 |
| 5 |
1 |
1 |
1 |
1 |
0 |
| 6 |
1 |
1 |
1 |
0 |
0 |
| 7 |
1 |
0 |
0 |
1 |
1 |
| 8 |
1 |
1 |
1 |
0 |
1 |
| 9 |
1 |
1 |
1 |
1 |
1 |
| Blank |
0 |
0 |
0 |
0 |
0 |
The following is a diagram of the DSKY face showing positions of the different digits:
Program
┌───────┬───────┐ │ MD1 │ MD2 │ └───────┴───────┘
Verb Noun
┌───────┬───────┐ ┌───────┬───────┐ │ VD1 │ VD2 │ │ ND1 │ ND2 │ └───────┴───────┘ └───────┴───────┘
Register 1
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R1D1 │ R1D2 │ R1D3 │ R1D4 │ R1D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
Register 2
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R2D1 │ R2D2 │ R2D3 │ R2D4 │ R2D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
Register 3
┌───────┬───────┬───────┬───────┬───────┬───────┐ │ ± │ R3D1 │ R3D2 │ R3D3 │ R3D4 │ R3D5 │ └───────┴───────┴───────┴───────┴───────┴───────┘
DSPTAB+11D. This register drives relays for the display
lights. The bit assignments are:
| Bit |
Assignment |
||||||
|---|---|---|---|---|---|---|---|
| 1 |
This bit differs by Lunar Module software
version.
|
||||||
| 2 |
This bit differs by Lunar Module software
version.
|
||||||
| 3 |
Landing Radar Velocity Fail |
||||||
| 4 |
No Attitude |
||||||
| 5 |
Landing Radar Altitude Fail |
||||||
| 6 |
Gimbal Lock |
||||||
| 7 |
|||||||
| 8 |
Tracker |
||||||
| 9 |
Program Caution |