VL Command - Speed Limits

Configure up to 16 independent speed limits that generate signals when exceeded.

What is it for?

🚗 Speed control — Monitor that vehicles do not exceed established limits
📊 Driving analysis — Record speeding events
🛡️ Road safety — Alert in real time about dangerous speed
📋 Regulatory compliance — Document adherence to legal limits
💰 Fuel savings — Identify high-speed driving

Command Summary

Action	Command	Description
Configure	`SVLaaubbbbcddd`	Define limit with all parameters
Query	`QVLaa`	Get configuration of a limit
Response	`RVLaaubbbbcddd`	Response format

Parameters

Field	Description	Values
aa	Limit index	`00`-`15` (16 available limits)
u	Status (Enable)	`E` = Enabled, `D` = Disabled
bbbb	Speed in km/h	`0000`-`9999`
c	Evaluation filter	`0` = No filter (default), `1` = GPS filtered (per CXCQ Command)
ddd	Tenths of second for signal stabilization	`000`-`999` (>= v1.09.07)

The GPS filter (c=1) smooths speed readings per the CXCQ Command, reducing false alarms from momentary fluctuations. The stabilization time (ddd) indicates the tenths of seconds the speed must exceed the limit before activating the signal (available since v1.09.07).

Associated Signals

Signals	Description
`VL00` - `VL15`	Activated when corresponding limit is exceeded

Examples

Basic 50 km/h limit


>SVL00E00500010<
// Limit 00: Enabled, 50 km/h, no filter, 10 tenths (1s) stabilization

80 km/h limit with GPS filter


>SVL01E00801020<
// Limit 01: Enabled, 80 km/h, GPS filtered, 20 tenths (2s) stabilization

Highway limit 120 km/h


>SVL02E01201030<
// Limit 02: Enabled, 120 km/h, GPS filtered, 30 tenths (3s) stabilization

Query configuration


>QVL00<
// Response: RVL00E00500010

Disable a limit


>SVL00D00500010<
// Keeps configuration but deactivates the limit

Use in Event Rules

SMS alert for speeding


>SRL80E;TRG=VL00+;ACC={GSMS Speed violation: >50km/h| GGPXXL}<
// Send SMS when exceeding 50 km/h

Periodic report while exceeding limit


>STD05 E 00060 00000<  // 60-second timer
>SRL81E;TRG=TD05+;CND=VL01;ACC={GGPXXL}<
// Report every 60s while exceeding limit 01

Zone-based speed system


// Urban zone: 50 km/h
>SVL00E00501020<
>SRL82E;TRG=VL00+;CND=RG00;ACC={GSMS Speed violation in urban zone}<
 
// School zone: 30 km/h
>SVL01E00301030<
>SRL83E;TRG=VL01+;CND=RG01;ACC={GSMS ALERT: Speed violation in school zone!}<

Speed event counter


>SRL84E;TRG=VL00+;ACC={SOUT00 1}<
// Increment counter each time limit is exceeded

To avoid false alarms, use the GPS filter (c=1) and a stabilization time of at least 20 tenths of a second (ddd>=020) for low limits.

Compatibility

💾Firmware:v1.00.00

SPLegacy

ULLegacy

MTLegacy

C3Legacy

C5Legacy

SP-IOT

SM-IOT

ZE-IOT