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|  MIL-D-70789A (AR)
APPENDIX C
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STORED BEADING SHUTDOWN
30.3.16 Command:
From: Prime System To: DRU
Function: This command requests the DRU to store position and attitude data
in non-volatile memory before power is removed and to automatically enter
the Stored Heading Align mode at the next power on. ALERT D3/7 shall be set
and the request ignore if the vehicle is moving when the command is
received. ALERT D2/0 shall be set If the vehicle is moving while the STORED
BEADING SHUTDOWN command is being processed. Alert D3/4 shall be set and the
request ignored if a STORED HEADING SHUTDOWN command is received prior
to completing a normal Align or accumulating a total of 15 minutes
stationary time after starting a Stored Heading Align.
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 STORED HEADING SHUTDOWN command
also shall cause the DRU to be deenergized. The time to complete storage
data shall not exceed 4.5 seconds beginning with receipt of the first bit
the command.
DRU Response:
STATUS DATA Message
COMMAND STRUCTURE
DATA
ERROR DET. CODE
SEQUENCE COMMAND
FLAG(F)
CHARACTERS(E)
FLAG(F) NUMBER(N) CODE(C)
CHARACTERS(D)
16 Bits
01111110
D1
01111110
XXX
10100
Number of Data Characters: 1
Data Format:
Unsigned Binary
Command Subcode
D1 Character (8 bits)
Value: 15
174
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