Tow Alert Parameters (TOWP)
A tow alert (i.e. report with REASON bit set indicating tow alert event) is generated
whenever movement is detected whilst the vehicle ignition is off. This scenario is
detected using a number of different sources, including GPS speed, GPS location,
accelerometer and mechanical tremble/motion sensor. The sensitivity of tow alert
detection can be changed using the TOWP command, as follows:
$TOWP,<distance_metres>,<speed_kmh>,<speed_seconds>,<motion_sensitivity>,
<trembler_sensitivity>
Field
Description
Range
<distance_metres>
GPS distance moved from
last STOP location
0
disable
100 – 65535 default=500m
<speed_kmh>
GPS speed detected.
Must exceed this threshold
for the time in the
<speed_seconds>
0
disable
20 – 65535 default=50kmh
<speed_seconds>
time for which the speed
must be above the
threshold in the field
<speed_kmh>
1 – 65535
default=10 sec
<motion_sensitivity>
accelerometer based
motion detection
sensitivity
0
disable
1 – 10
(1=most sensitive,
10=least sensitive,
default=5)
<trembler_sensitivity> Mechanical tremble sensor
sensitivity
0
disable
1 – 10
(1=most sensitive,
10=least sensitive
default=5)
