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XAICHA — Harsh Forward Acceleration Threshold

Configures the acceleration threshold used to detect harsh forward acceleration events (signal F40). The threshold is the X-axis acceleration magnitude in milli-g (mg) that must be exceeded to raise the event.

Format​

  • Query: >QXAICHA<
  • Set: >SXAICHA{VALUE}<
  • Reset to default: >SXAICHA<
FieldDescription
VALUEThreshold magnitude in mg (unsigned integer)

Response​

>RXAICHA{VALUE}<

Examples​

>QXAICHA<       →  >RXAICHA260<
>SXAICHA400<    →  >RXAICHA400<
>SXAICHA<       →  >RXAICHA260<  (reset to default)
  • F40 — Harsh forward acceleration (alignment gated)

Notes​

  • A lower value increases sensitivity (events trigger sooner); a higher value reduces false positives.
  • All driving-behaviour signals require IMU axis alignment to be complete (see XAICAR).
  • Sending >SXAICHA< without a value resets the threshold to its factory default.
  • Out-of-range values are rejected.
  • The threshold is persisted across reboots.

Defaults and Limits​

  • Default value: 260 mg.
  • Valid range: 10 to 2000 mg.