Moog Crossbow GNAV540 - Manual (Page 70)

age 70 GNAV540 User Manual
7430‐0808‐01 Rev. B
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calibrationRequest Description
calibration command.
0x000E Write magnetic calibration. The unit will write the parameters to
EEPROM and then send a calibration response.
Calibrate Acknowledgement Response
Table 27 Calibrate WC ACK Response
Calibrate (‘WC’ = 0x5743)
Preamble Packet Type Length Payload Termination
0x5555 0x5743 0x02
The unit will send this packet in response to a calibrate request if the procedure can be performed or initiated.
Table 28 WC Payload
WC Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 calibrationRequest U2 — — The requested calibration task
Calibration Completed Parameters Response
Table 29 Calibration Completed
Calibrate Completed (‘CC’ = 0x4343)
Preamble Packet Type Length Payload Termination
0x5555 0x4343 0x08
The unit sends this packet after a calibration has been completed. Currently, there is only one message of this type
sent after a magnetic calibration has been completed (with or without automatic termination) and the parameters
have been calculated. The calibrationRequest field will be 0x000B or 0x000C.
Table 30 CC Payload Contents
CC Payload Contents
Byte
ffset O
Name Format Scaling Units Description
0 calibrationRequest U2 — — The requested calibration task
2 xHardIron I2 2/2^16 G The x hard iron bias
4 yHardIron I2 2/2^16 G The y hard iron bias
6 softIronScaleRatio U2 2/2^16 — The scaling ratio between the x
and y axis