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CommandsGeneralContextCXIGN

CXIGN Command - Ignition Mode

Configures the IGN variable operation, maintaining its function according to the physical input sensing, or virtualizing its logical state. Also allows adjusting the stabilization (debounce) times for validating ignition turn-on and turn-off.

What is it for?

Use caseDescription
🔌 Simplified installationDetect ignition by voltage
🛠️ No physical connectionVirtualize IGN in portable applications
📊 Force stateManually set IGN for testing
⚡ By power supplyUse battery voltage as indicator
⏱️ Filter noiseTune turn-on / turn-off stabilization times

Description

This command allows:

  • Maintain normal operation according to the physical ignition input
  • Manually set its value to a predetermined state
  • Adapt its operation to the device’s external power supply voltage
  • Release the IN07 input in manual mode, so it can be used for another purpose
  • Configure stabilization times (ton and toff) to avoid false positives from intermittent signals

The voltage mode allows dispensing with the electrical connection for ignition sensing.

Commands

Configure

SCXIGNa[,ton[,toff]]

Query

QCXIGN

Response

RCXIGNa,ton,toff

Parameters

Mode (a)

ValueDescription
0Normal (default). According to physical ignition input
1Manual, allowing state setting through SS command
2By voltage (according to main power supply)
3Manual releasing IN07 (allows using IN07 for another purpose)

Stabilization times (ton, toff)

ParameterFunctionRangeDefault
tonTime the signal must remain active to confirm IGN ON1 to 9999100 (10 s)
toffTime the signal must remain inactive to confirm IGN OFF1 to 9999100 (10 s)

ton and toff are expressed in units of 100 ms (e.g. ton=50 equals 5 s). Both are optional: if omitted, previously configured values are kept.

Voltage thresholds (mode 2)

In mode 2 the device decides IGN by comparing the supply voltage against two thresholds with hysteresis. By default it picks them automatically according to the detected electrical family:

Family (automatic)IGN ON aboveIGN OFF below
12 V car (voltage ≤ 17 V)13.3 V12.9 V
24 V truck (voltage > 17 V)25.4 V24.7 V

Since v1.09.26 the thresholds can be set manually with the V suffix, for vehicles whose charging ranges don’t match the automatic ones (smart alternators, AGM/LiFePO4 batteries, machinery).

Configure manual thresholds

>SCXIGNV1,138,131<   // enable: IGN ON above 13.8 V, OFF below 13.1 V
>SCXIGNV0<           // disable: back to automatic thresholds
ParameterDescriptionRange
onTurn-on threshold, in tenths of a volt (138 = 13.8 V)80–320
offTurn-off threshold, in tenths of a volt (131 = 13.1 V)80–320

Validation: on must be greater than off — the difference between them is the hysteresis that prevents oscillations. With manual thresholds active, the automatic 12/24 V family selection is bypassed. The configuration persists across restarts.

Query thresholds and current voltage

>QCXIGNV<
>RCXIGNV1,138,131,128<
FieldDescription
1st1 = manual thresholds, 0 = automatic
2nd / 3rdEffective ON / OFF thresholds (in automatic mode, shows the ones in use)
4thVoltage measured at that moment, in tenths of a volt

The first three fields of the response mirror the set command: the query response can be sent back as-is as a set.

  1. With the engine off: >QCXIGNV< and note the voltage in the last field (e.g. 126)
  2. With the engine running: >QCXIGNV< and note it (e.g. 143)
  3. Choose two cut points inside that band, with margin at both ends: >SCXIGNV1,138,131<

The last-field voltage is the same —and in the same unit— as the V field of the reports: the procedure can also be done remotely by looking at the platform history.

Examples

Manual mode with fixed IGN

>SCXIGN1<
>SSSIGN11<

Manual operation mode is set, then the IGN value is fixed = 1 (regardless of the case).

Configure custom times

>SCXIGN0,50,150<

Normal mode (physical input), with ton = 5 s and toff = 15 s. Useful when a slower turn-off is desired to capture post-ignition events.

Change only the turn-on time

>SCXIGN0,200<

Normal mode, ton = 20 s; toff keeps its previously configured value.

Query current configuration

>QCXIGN<
>RCXIGN0,100,100<

Tune thresholds on a vehicle with shifted ranges

>SCXIGN2<              // ignition by voltage
>QCXIGNV<              // engine off -> RCXIGNV0,133,129,126
>QCXIGNV<              // engine running -> RCXIGNV0,133,129,143
>SCXIGNV1,138,131<     // cut points inside the measured band
>RCXIGNV1,138,131,143<

Compatibility

💾Firmware v1.14.00
SPLegacy
ULLegacy
MTLegacy
C3Legacy
C5Legacy
💾Firmware v1.00.00
SP-IOT
SM-IOT
ZE-IOT
SCXIGNV thresholds since v1.09.26

Version availability:

  • Mode 3 (Manual releasing IN07): available from firmware v1.09.15.
  • Timing parameters ton and toff: available from firmware v1.09.17.
  • Configurable voltage thresholds (SCXIGNV / QCXIGNV): available from firmware v1.09.26 (IoT line).

On earlier versions, only SCXIGN<a> with a between 0 and 2 is accepted.

See Also

Last updated
CXCELDEBCXRF