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DataAndConfigurationMessages / 74ExternalAuxiliaryChannels

External auxiliary channel

Channel Number74
Total Length5 bytes
ChannelData1Data2Data3Checksum

Sensor location = Data1

  1. External Auxiliary channel 1 - (Throttle Position)
  2. External Auxiliary channel 2 - (Lambda 1 Short Term Trim)
  3. External Auxiliary channel 3 - (Lambda 2 Short Term Trim)
  4. External Auxiliary channel 4 - (Lambda 1 Long Term Trim)
  5. External Auxiliary channel 5 - (Lambda 2 Long Term Trim)
  6. External Auxiliary channel 6 - (Fuel Inj 1 Pulse Width)
  7. External Auxiliary channel 7 - (Fuel Inj 2 Pulse Width)
  8. External Auxiliary channel 8 - (Fuel Inj 3 Pulse Width)
  9. External Auxiliary channel 9 - (Fuel Inj 4 Pulse Width)
  10. External Auxiliary channel 10 - (Fuel Inj 5 Pulse Width)
  11. External Auxiliary channel 11 - (Fuel Inj 6 Pulse Width)
  12. External Auxiliary channel 12 - (Fuel Inj 7 Pulse Width)
  13. External Auxiliary channel 13 - (Fuel Inj 8 Pulse Width)
  14. External Auxiliary channel 14 - (Fuel Inj 1 Cut Level)
  15. External Auxiliary channel 15 - (Fuel Inj 2 Cut Level)
  16. External Auxiliary channel 16 - (Fuel Inj 3 Cut Level)
  17. External Auxiliary channel 17 - (Fuel Inj 4 Cut Level)
  18. External Auxiliary channel 18 - (Fuel Inj 5 Cut Level)
  19. External Auxiliary channel 19 - (Fuel Inj 6 Cut Level)
  20. External Auxiliary channel 20 - (Fuel Inj 7 Cut Level)
  21. External Auxiliary channel 21 - (Fuel Inj 8 Cut Level)
  22. External Auxiliary channel 22 - (Ignition Cut Level)
  23. External Auxiliary channel 23 - (ISBV 1 Open)
  24. External Auxiliary channel 24 - (ISBV 2 Open)
  25. External Auxiliary channel 25 - (Nitrous)
  26. External Auxiliary channel 26 - (Auxiliary 1)
  27. External Auxiliary channel 27 - (Auxiliary 2)
  28. External Auxiliary channel 28 - (Auxiliary 3)
  29. External Auxiliary channel 29 - (Auxiliary 4)
  30. External Auxiliary channel 30 - (Fuel Aux Temp Comp)
  31. External Auxiliary channel 31 - (Fuel Aux Volt Comp)

Data has a resolution of 0.1 and a range of -3276.8 to 3276.7

If Data3 & 0x80 = 1, Output = - (65536- (Data2 + Data3 x 2^8))/10
Else Output = (Data2 + Data3 x 2^8)/10

The following external auxiliary data channels are output by the SPEEDBOX, SPEEDBOX-INS and/or GPS2.

  • External auxiliary channel 17: GNSS observables status (GPS2 only)
    Each 4 bits of this message indicate the number of good observables (in the range 0..15) being generated by the unit's internal GNSS receiver for each of 4 GNSS constellation/frequency combinations as indicated below:
    bits 0..3: Number of GPS L1 good observables
    bits 4..7: Number of GPS L2 good observables
    bits 8..11: Number of GLONASS L1 good observables
    bits 12..15: Number of GLONASS L2 good observables


  • External auxiliary channel 18: Incoming corrections observables status (GPS2 only)
    Each 4 bits of this message indicate the number of good observables (in the range 0..15) received as incoming correction data for each of 4 GNSS constellation/frequency combinations as indicated below:
    bits 0..3: Number of GPS L1 good observables
    bits 4..7: Number of GPS L2 good observables
    bits 8..11: Number of GLONASS L1 good observables
    bits 12..15: Number of GLONASS L2 good observables


  • External auxiliary channel 19: RTCM incoming corrections status (GPS2 only)
    A bit-field where each set bit indicates that that message has been received at least once since the last output of this message. The messages indicated by each bit are:
    bit 0: rtcm v3 message 1001
    bit 1: rtcm v3 message 1002
    bit 2: rtcm v3 message 1003
    bit 3: rtcm v3 message 1004
    bit 4: rtcm v3 message 1005
    bit 5: rtcm v3 message 1006
    bit 6: rtcm v3 message 1007
    bit 7: rtcm v3 message 1008
    bit 8: rtcm v3 message 1009
    bit 9: rtcm v3 message 1010
    bit 10: rtcm v3 message 1011
    bit 11: rtcm v3 message 1012
    bit 12: Any other rtcm v3 message not listed above
    bit 13: Any rtcm v2 message
    bit 14: Reserved
    bit 15: Reserved


  • External auxiliary channel 20: INS overall accuracy (SPEEDBOX-INS only)
    INS overall accuracy [%]


  • External auxiliary channel 21: Output offset forward
    Forward output offset in cm. +ve for forward, -ve for backward.


  • External auxiliary channel 22: Output offset right
    Right output offset in cm. +ve for right, -ve for left.


  • External auxiliary channel 23: Output offset down
    Down (below) output offset in cm. +ve for down, -ve for up.


  • External auxiliary channel 24: Combined speed accuracy (SPEEDBOX-INS only)
    spd_acc [ms/s] * 100


  • External auxiliary channel 25: Yaw accuracy (SPEEDBOX-INS only)
    yaw_acc [degrees] * 100


  • External auxiliary channel 26: GPS status
GPS Status codes:
0: GPS module not detected
1: Searching for satellites
2: Insufficient satellites
3: Solution aborted
4: Solution failed
5: Exceeded maximum speed or altitude
6: Unused
7: Unused
8: Unused
9: Unused
10: Lock: Position but no speed
11: Lock: Doppler speed and position
12: Lock: Carrier speed and position
20: External solution: No lock
21: External solution: Standalone (autonomous) solution
22: External solution: Solution corrected with WAAS/SBAS
23: External solution: Code differential (DGPS) solution
24: External solution: Phase differential (RTK) solution with float ambiguities
25: External solution: Phase differential (RTK) solution with integer ambiguities


  • External auxiliary channel 27: INS convergence (SPEEDBOX-INS only)
    0->99%, INS not converged, convergence progress from 0.05 to 0.01 kf_convergence.
    100%, INS converged.


  • External auxiliary channel 28: Number of satellites (module 1)
    Number of satellites


  • External auxiliary channel 29: Number of satellites (module 2)
    Number of satellites


  • External auxiliary channel 30: Trigger input state
    trigger state (0 or 1)
    The state of the external trigger, note that this is only provided as a convenience for testing the operation of the trigger - do not use for timing.


  • External auxiliary channel 31: acb_convergence (SPEEDBOX-INS only)
    acb_convergence * 10000
    This is the current error weighting for brake distance, this is used by the RT run processor software
Page last modified on December 08, 2016, at 05:06 PM