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|  MIL-D-70789A (AR)
APPENDIX D
D- Character, Data Update
Bit Set
DRU Spheroid Change. Due to a position update during Normal Align
7
the DRU Spheroid was changed from what was in storage.
DRU Hemisphere/Zone Change. Due to a position update the DRU
6
hemisphere or zone was changed.
BCU Parameter Change. A present position update command caused the
5
BCU hemisphere, Spheroid, or Zone to change.
4
Altitude Update Rejected. During Survey the DRU rejected this
update because the magnitude of the closure error exceeded 50 meters
plus the DRU 12-Sigma altitude error estimate. During Normal Align
the DRU rejected this update because it iS out of the allowable
range.
Horizontal Position Update Rejected. During survey the DRU rejected
3
this. update because the magnitude of the closure error exceeded 150
meters plus the DRU 12-sigma error estimate for horizontal position.
During Normal Align the DRU rejected this update because it is out
of the allovable range.
2
Spare.
Altitude Update Excessive. This bit set indicates the magnitude of
1
the closure error exceeds 5 meters plus the DRLl 3-sigma altitude
error estimate.
0
Horizontal Position Update Excessive. This bit set indicates the
magnitude Of the update closure error exceeds 10 meters plus the DRU
3-sigma error estimate for horizontal position.
D5 Character, Communication
Bit Set
Invalid Upon Request. Attempt to enter update data when the DRU
7
cannot accept it.
Invalid Mode Request. DRU can recognize request but it cannot
6
respond at this time.
5
Invalid Data Request. Data requested is not currently available.
4
Pointing Device Boresight Angles Not Present. The DRU did not
receive the Pointing Device boresight angles or for an unknown
reason the stored Pointing Device boresight angles were erased.
Configuration Data Not Present. The DRU did not receive the
3
configuration data or for an unknown reason the stored data was
erased.
Invalid Data Received. Data received was outside the allowable
2
range.
Invalid Command Received.
An invalid command was received on the
1
Auxiliary Data BUS.
0
Undefined Command Received. An unrecognized command has been
received.
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