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|  MIL-D-70789A (AR)
APPENDIX E
30.5 Status Characters
The presence of a "1" in any of the bit positions indicates that the mode or
condition listed below exists. The conditions which cause setting or
resetting of the bits are described in Table 30.5. At turn-on, all STATUS
bit positions, except S1/7, shall be reset to "0". Each bit position shall
not be set to "1" until the specified set condition is encountered.
S1 Character
BIT POSITION
MODE OR CONDITION
7
DRU In Startup Mode.
6
Spare.
5
DRU In Normal Align Or Stored Heading Align mode.
4
DRV In Survey Mode.
3
DRU In Exclusive ZUPT Mode.
2
Zero-Velocity Stop Request.
1
Position Update Request.
0
Auxiliary Bus Control Is Inhibited.
S2 Character
BIT POSITION
MODE OR CONDITION
7
Zero-Velocity Update In Progress.
6
Position Update In Progress.
5
The DRU, VMS, Or VHS Drive Has Malfunctioned.
4
Pointing Device In Travel Lock.
3
Shot Detect.
2
DRU In Stored Beading Align Mode.
1
DRU Alert.
0
Spare.
199
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