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XACS — Over Speed Counter

Reads or sets the over-speed counter and its speed threshold. The counter accumulates every second the vehicle travels above the configured threshold.

Format​

  • Query counter value: >QXACSV<
  • Set counter value: >SXACSV{BBBBBBBBB}<
  • Query threshold: >QXACST<
  • Set threshold: >SXACST{TTTT}<
  • Response (value): >RXACSV{BBBBBBBBB}<
  • Response (threshold): >RXACST{TTTT}<
FieldDescription
VFlag — selects the counter value
TFlag — selects the speed threshold
BBBBBBBBBCounter value in seconds (9 digits, zero-padded)
TTTTSpeed threshold in mph × 10 (4 digits). Example: 0550 = 55.0 mph

Examples​

Query current over-speed counter value:

>QXACSV<
>RXACSV000001909<

1909 seconds spent above the speed threshold.

Set the over-speed counter to 10458 seconds:

>SXACSV000010458<

Set the speed threshold to 55 mph:

>SXACST0550<

Query the current speed threshold:

>QXACST<
>RXACST0550<
  • Extended tag CS reports the counter value in position messages.

Defaults and Limits​

  • Counter value field uses 9 digits and threshold uses 4 digits.
  • Threshold is interpreted as mph x10.
  • Default values are implementation-defined (persistent counter + threshold state).