1775 IMU Technical Manual
13
Data Output Signal Processing
Figure 12: Status Byte Format
NOTE: In addition to this general status information, an extended built-in
test (BIT) may be initiated by entering the “?bit” or “?bit,2” command.
(Extended BIT data is also output whenever the IMU is first powered on.) The
extended BIT provides six bytes of diagnostic data. The 1775 IMU records
and reports stored BIT history as an optional diagnostic aid. For more
information, refer to “Appendix C: Electrical Signaling ICD” on page 31.
Figure 13: CRC Format
NOTE: The 32-bit CRC used for message data verification ensures the data
received (or transmitted) is valid.
Function Bit # Notes
Gyro X status 0 (LSB) 1 = Valid data, 0 = Invalid data
Gyro Y status 1 1 = Valid data, 0 = Invalid data
Gyro Z status 2 1 = Valid data, 0 = Invalid data
Reserved 3 Always 0
Accelerometer X status 4 1 = Valid data, 0 = Invalid data
Accelerometer Y status 5 1 = Valid data, 0 = Invalid data
Accelerometer Z status 6 1 = Valid data, 0 = Invalid data
Reserved 7 Always 0
Parameter Value
Width 32
Poly 0x04C11DB7
Reflect In False
XOR In 0xFFFFFFFF
Reflect Out False
XOR Out 0
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