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MIL-D-70789A (AR)
q.
Orientation 2 to orientation 1 direction of traverse.
This flag, used in conjunction with the "Orientation 2 Based on
Pointing-Device Attitude" and "Orientation 2-1 Based on Pointing
w
Device  Pitch/Roll flags, controls whether the DRU transitions
from orientation 2 to orientation 1 as the selected angle (pitch
or roll) either increases or decreases as it crosses the 2-1
Threshold Angle.
When set to "11", this flag indicates that the DRU shall
transition from Orientation 2 to Orientation 1 when the direction
of traverse causes the absolute value of the angle to increase as
it crosses the 2-1 Threshold Angle.
When set to "00", this flag indicates that the DRU shall
transition from Orientation 2 to Orientation 1 when the direction
of traverse causes the absolute value of the angle to decrease as
it crosses the 2-1 Threshold angle.
When set to "01", this flag indicates that the DRU shall
transition from Orientation 2 to Orientation 1 when the direction
of  traverse  causes  the  angle  to  numerically  increase  as  it
crosses the 2-1 Threshold-Angle.
When set to "10", this flag indicates that the DRU shall
transition from Orientation 2 to Orientation 1 when the direction
of traverse causes the angle to numerically decrease as it
crosses the 2-1 Threshold Angle.
r. Orientation 2 based on Pointing device attitude.
When set, the DRU shall transition between Orientation 1 and
Orientation 2 as the selected angle (pitch/roll) either increases
or decreases as it crosses the respective Threshold Angle.
When reset, the DRU shall not transition between Orientation 1
and Orientation 2 as a function of pointing device pitch or roll.
3.5.8.9  Configuration selection. The DRU shall identify the
configuration data to be used by the configuration code number
programmed for the four configuration discretes on J1. An open
circuit shall indicate a logic "0". A connection to signal
ground shall indicate a logic "1". The discrete input circuits
shall require external drivers to source or sink no more than 2.0
milliamperes. The DRU shall contain 15 sets (configuration code
numbers 0 through 14) of permanently stored configuration data.
When configuration code 15 is selected, the DRU shall accept and
use configuration data loaded using an ACCEPT CONFIGURATION DATA
Command. The DRU shall maintain a Configuration Data Present
48

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