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| MIL-D-70789A (AR)
If either the Travel Lock Discrete or Travel Lock Commands
Configuration Flag is set (3.5.8.8), the DRU shall determine
whether the pointing device is in or out of travel lock by the
travel lock discrete (3.5.4.5} or by the IN TRAVEL LOCK command
and OUT OF' TRAVEL LOCK command.
When the travel lock discrete is a logic "1" or on receipt of the
OUT OF TRAVEL LOCK command, which will be issued just prior to
the pointing device leaving travel lock, the DRU shall:
a.
Freeze vehicle attitudes.
Freeze and store travel lock pointing device
b.
references (azimuth and pitch) in terms of the appropriate
Orientation (1 or 2).
Reset bit 4 of STATUS character S2.
c.
d.
Enter the Exclusive ZUPT Mode.
If the vehicle moves, set bit 0 of ALERT DATA
e.
character D3.
When the Travel Lock Discrete is a logic "1" at DRU turnon, the
DRU shall:
a.
Reset STATUS S2/4 (Pointing Device in Travel Lock).
b.
Enter the Exclusive ZUPT Mode.
If the vehicle moves, set ALERT DATA D3/0 (Motion
c.
with Pointing Device out of Travel Lock).
In this situation, vehicle attitudes and travel lock pointing
device azimuth and pitch references may be set to any value
within the allowable ranges. These parameters are not valid
since the orientation of the pointing device in the travel lock
position is unknown.
When the travel lock discrete transitions to a logic "O" or on
receipt of the IN TRAVEL LOCK command, which will be issued after
the pointing device is clamped to the vehicle chassis, the DRU
shall:
Provide present vehicle attitudes.
a.
Provide present pointing device azimuth asnd pitch for
b.
travel lock reference.
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