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|  MIL-D-70789A (AR)
c.
After the DRU is able to respond to comands
(3.5.3.1.1.9),Auxiliary Bus control shall be enabled if the
ENABLE AUXILIARY BUS CONTROL command is received on the Main Bus.
In which case, STATUS bit S1/0 shall be reset on both data buses.
Once Auxiliary Bus control is enabled, it shall be
d.
inhibited if the INHIBIT AUXILIARY BUS CONTROL comand
received on the Main Bus. In which case, STATUS bit S1/0 shall
be set on both data buses.
When Auxiliary Bus control is inhibited the Auxiliary
e.
Bus shall respond only to the following commands:
RETURN TRAVEL LOCK DATA
(1)
RETURN ATTITUDE DATA
(2)
RETURN CONFIGURATION DATA
(3)
RETURN STATUS
(4)
RETURN NAVIGATION DATA
(5)
RETURN ALIGN TIME TO GO DATA
(6)
RETURN ALERT DATA
(7)
RETURN BIT DATA
(8)
RETURN POINTING DEVICE RATE DATA
(9}
RETURN POSITION DATA
(10)
RETURN POINTING DEVICE ATTITUDE DATE
(11)
RETURN POINTING DEVICE BORESIGHT
(12)
RETURN EXPMED
STATUS
(13)
RETURN SURVEY QUALITY
(14)
RETURN VEHICLE BORESIGHT
(15)
RETURN GEODETIC DATA
(16)
COMMAND ASSIGNED TO SUPPLIER (Optional)
(17)
OVERRIDE ALERT
(18)
When Auxiliary Bus control is inhibited, receipt of an OVERRIDE
ALERT command on the Auxiliary Bus shall reset only those ALERT
DATA bits specific to the Auxiliary Bus.
If any other comand is received over the Auxiliary Bus while
control is inhibited, the DRU shall send a STATUS DATA message,
with status bit S2/1 set, over the Auxiliary Bus. Bit 1 in
character D5 of the Alert Data, described in 30.4.6, shall be
set.
When Auxiliary Bus control is enabled the Auxiliary
f.
Bus shall respond to all commands except INHIBIT and ENABLE
AUXILIARY BUS CONTROL. Should either of those commande be
received, the Auxiliary Bus shall indicate an ALERT in a STATUS
DATA message and bit 1 of Alert Data character D5 shall be set.
35
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