A.4
DATA TRANSFER FORMATS
A.4.1
Position Format
Position values are represented in the Scaled Binary Coded Angle (SBCA) format. The equiva-
lent weight of any bit in degrees is given by the formula:
360 / 2^N, where N = bit number (MSB = bit 1)
This gives the following bit weightings:
MSB: (bit 1) 180 degrees
(bit 2) 90 degrees
(bit 3) 45 degrees
(bit 4) 22.5 degrees
........
(bit 16) 0.00549 degrees
SBCA values are represented as a 16-bit hexadecimal number. For example:
Hexadecimal Value
Position
8000H
180 deg
1000H
22.5 deg
0001H
0.00549 deg
C000H
-90 (270) deg
3862 Autotrack Controller
A-46
REMOTE INTERFACE COMMANDS
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