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|  MIL-D-70789A (AR)
3.5.4.5 Travel lock discrete. If the Configuration
Definition Flag for travel lock discrete (3.5.8.8c) is set, the
DRU shall use the travel lock discrete to determine whether the
pointing device is in or out of travel lock. When the discrete
signal to the DRU is a logic "0", the pointing device shall be
considered to be in travek lock. When the discrete signal to the
DRU is a logic "1", the pointing device shall be considered to be
out of travel lock.
3.5.4.6 Odometer interface. The DRU shall utilize odometer
pulses representing incremental distance traveled in forward and
reverse directions by the vehicle on which the DRU is mounted.
Both the forward and backward direction pulses are nominally
scaled to represent 0.165 feet per pulse. The pulses are
800 + 60 micro-seconds in width and the frequency of the pulses
varies from 0 to 711 pulses/second for a forward or backward
speed of 0 to 80 miles per hour.
The DRU shall generate discrete test commands which will direct
the VMS to perform BIT.
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