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|  MIL-D-70789A (AR)
APPENDIX C
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30.3.9 Command: SHUTDOWN
From: Prime System To: DRU
This command requests the DRU to store position data in a non
Function:
VOLATILE memory before power is removed. Alert Data bit 7 of character D3
shall be set and the request ignored if the vehicle is moving when the
command is received. ALERT bit 0 of character D2 shall be set if the
vehicle is moving while the ShUTDOWN command is being processed.
Current position, attitudes, and any other data which are necessary to
resume normal operation when power is turned on, shall be stored prior to
removing power. If power control is enabled the SHUTDOWN Command also shall
cause the DRU to be deenergized. The time to complete storage of data
shall not exceed 4.5 sec beginning with receipt of the first bit of the
command.
DRU Response:
STATUS DATA Message
commAND STRUCTURE
SEQUENCE
DATA
ERROR DET. CODE
COMMAND
CHARACTERS(E)
FLAG(F) NUMBER(N) CODE(C)
FLAG(F)
CHARACTERS
01111110
XXX
01111130
NONE
16 Bits
11110
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30.3.10 Command:
OUT OF TRAVEL LOCK
Prime System TO: DRU
From:
Function: This command tells the DRU that the pointing device is about to
leave travel lock.
DRU Response:
STATUS DATA Message
COMMAND STRUCTURE
ERROR DET. CODE
SEQUENCE
DATA
COMMAND
CHARACTERS
FLAG(F)
FLAG(F)
NUMBER(N)
CODE(C)
CHARACTERS(D)
D1
16 Bits
01111110
01111110
XXX
10100
Number of Data Characters: 1
D1 Binary
Data Format:
Command Subcode
D1 Character (8 bits)
Value: 6
170
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