MVT Command — Movement Thresholds

Movement and vibration detection with 12 configurable thresholds per axis.

What is it for?

Use case	Description
🔒 Anti-theft system	Detect when the vehicle is moved without authorization
📳 Vibration detection	Identify tampering or towing attempts
🚛 Cargo monitoring	Alert sudden movements in freight transport
⚠️ Directional alarms	Differentiate movement by axis (forward, lateral, vertical)

Description

Configures movement detection thresholds based on accelerometer readings. Allows defining 12 independent thresholds for the 3 axes (X, Y, Z) in their positive and negative directions. Generates MVXP, MVXN, MVYP, MVYN, MVZP, MVZN signals as triggers.

Features

12 configurable thresholds
X, Y, Z axes (positive/negative each)
Differential detection of movement
Independent signals per axis and direction
Ideal for anti-theft and movement detection

Commands

Configure deltas


SMVTaabbbbccccdddd

Parameters:

aa: Instance index (00-03, there are 4 instances)
bbbb: X-axis delta, 4 digits
cccc: Y-axis delta, 4 digits
dddd: Z-axis delta, 4 digits

The command always carries 14 digits after SMVT. If any is missing, the device answers CMDERR.


// Instance 00, delta 0150 on all three axes
>SMVT00015001500150<

Query deltas


QMVTaa


>QMVT00<

The values are deltas: the change between one accelerometer reading and the previous one, not the absolute acceleration. They use the same scale as the calibrated values returned by QAC.

MVT Signals

Available edges

Signal	Activation	Description
`MVXP+`	X-axis positive exceeded threshold	Forward longitudinal acceleration
`MVXP-`	X-axis positive below threshold	Returned to rest
`MVXN+`	X-axis negative exceeded threshold	Backward longitudinal acceleration
`MVXN-`	X-axis negative below threshold	Returned to rest
`MVYP+`	Y-axis positive exceeded threshold	Left lateral acceleration
`MVYP-`	Y-axis positive below threshold	Returned to rest
`MVYN+`	Y-axis negative exceeded threshold	Right lateral acceleration
`MVYN-`	Y-axis negative below threshold	Returned to rest
`MVZP+`	Z-axis positive exceeded threshold	Upward vertical acceleration
`MVZP-`	Z-axis positive below threshold	Returned to rest
`MVZN+`	Z-axis negative exceeded threshold	Downward vertical acceleration
`MVZN-`	Z-axis negative below threshold	Returned to rest

All edges have positive (+) and negative (-) versions for detecting start and end of movement.

Compatibility

💾Firmware v1.08.00

SPLegacy

ULLegacy

💾Firmware v1.00.00

SP-IOT

SM-IOT