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|  MIL-D-70789A (AR)
APPENDIX D
**************************************************************************
TRAVEL LOCK DATA
30.4.8 Message:
From: DRU To:
Prime System
Number of Data Characters: 12
Data Format:
Binary 2's Complement
MESSAGE STRUCTURE
ECHO
STATUS
ERROR DET.
FLAG(F)
S1, S2
SEQ#(N)
IDENTIFIER(I)
DATA(D)
CODE (E) FLAG(F)
01111110
XXX
16 Bits
D1-D12
00011
16 bits 01111110
The pointing device geodetic Azimuth or grid azimuth and pointing device
pitch angles representing the travel lock position are stored in memory. If
the pointing device is moved from travel lock the reference data is used for
returning to the travel lock position.
D1, D2 Characters. (16 bits, unsigned binary)
Pointing Device Geodetic
Range:
0 to 6399.9 mils
Azimuth or Grid Azimuth
Resolution: 0.1 mil
D3,
D4
Characters (15 bits)
Pointing Device Pitch
Range:
-1600 mils to +1600 mils
Resolution: 0.1 mil
D5, D6 Characters (16 bits, unsigned binary)
Travel Lock Pointing
Range:
Device Geodetic or Grid
0 to 6,399.9 mils
Resolution: 0.1 mil
Azimuth Reference
D7, D8 Characters (15 bits)
Travel Lock Pointing
Range:
Device Pitch Reference
-1600 to +1600 mils
Resolution: 0.1 mil
Pointing Device Azimuth Rate
D9, D10 Characters (16 bits)
Range:
-5898.24 to +5898.06 mils/see*
Resolution: 0.18 mil/second
D11, D12 Characters (16 bits)
Pointing Device Pitch Rate
Range:
-5898.24 to +5898.06 mils/see*
Resolution: 0.18 mil/second
* For rates outside of the range, the output value shall be fixed at
-5898.24 for negative rates and +5898.06 for positive rates.
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