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|  MIL-D-70789A (AR)
APPENDIX D
30.4 Definition of Data Messages
Ranges for data which have defined or absolute limits are given as the
defined limits. Ranges for data which have no particular defined boundaries
are given as the limits set by the data word size. Data words for some
parameters include partial least significant bytes. Since the values of the
unused bits are not specified, the positive numerical limit will
fractionally increase if all bits in the byte are read.
**************************************************************************
30.4.1
Message:
POINTING DEVICE RATE DATE
From: DRU To:
Prime System
Number of Data Characters: 6
Data Format:
Binary 2's Complement
<MESSAGE STRUCTURE
ERROR DET.
ECHO
STATUS
DATA(D)
CODE (E) FLAG(F)
FLAG(F)
SEQ#(N) IDENTIFIER(I) S1,S2
16
bits
01111110
01111110 XXX
16 Bits DI-D6
01011
The angular rate of DRU Azimuth, Pitch and Roll are contained in the six
characters of the data.
Pointing Device
D1, D2 Characters (16 bits)
Azimuth Rate
Range:
-3276.8 to +3276.7 roils/second*
Resolution: 0.1 roil/second
Pointing Device
D3, D4 Characters (16 bits)
Pitch (Elevation Angle)
-3276.0 to +3276.7 nils/second*
Range:
Rate
Resolution: 0.1 roil/second
Pointing Device
D5, D6 Characters (16 bits)
Roll Rate
Ranges
-3276.0 to +3276.7 nils/second*
Resolution: 0.1 roil/second
* For rates outside the data range, the value shall be fixed at +3276.7
for positive rates and -3276.8 for negative rates.
178
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