TOW (Tow Alarm Detection)

The AT@TOW command is used to configure the tow alarm parameters. When the tow alarm event is detected, the terminal will generate and send the report carrying Record 13H to the backend server.

The judgment of towing events depends on the motion detection. For the motion detection, please refer to the AT@GSENSOR command.

Example:
AT@TOW=gv500cna,,1,1,10,,,,,012F$
+ACK:TOW,123456789012345,8203,3,0,,012F,20210407101530,1234$
AT@TOW?gv500cna,,0C37$
+QRY:TOW,123456789012345,8203,3,0,1,1,,1,1,10,,,,,0C37,20210407101530,1234$

Parts	Fields	Length (Byte)	Range/Format	Default
Head	Header	3	AT@	AT@
	Command Word	3	TOW	TOW
	Leading Symbol	1	=	=
	Password	8-16		gv500cna
Body	Reserved	0
	Mode	1	0-1	0
	Fake Tow Delay	<=2	0-10 (minutes)	1
	GNSS Lost to Tow	<=2	5-15 (minutes)	10
	Reserved	0
	Reserved	0
	Reserved	0
	Reserved	0
Tail	Sequence Number	4	0000-FFFF (‘0’-‘9’, ‘A’-‘F’)
	Tail	1	$	$

• Mode

  Enable/disable tow alarm detection.

  • 0 - Disable the tow alarm.

  • 1 - Enable the tow alarm.

• Fake Tow Delay

  A time parameter to measure whether the terminal is in fake tow state.

  In the engine off state, if the terminal detects the motion status lasts for a 'Fake Tow Delay' duration, it is considered to be a fake tow state.

• GNSS Lost to Tow

  A time parameter to measure whether the device is considered being towed when GNSS lost during the terminal is in fake tow state.

  In fake tow state, the terminal will further confirm whether it is a real tow according to the GNSS positioning information. In this process, if the GNSS lost signal for ‘GNSS Lost to Tow’ minutes, it is considered to be a real tow.