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 and accelerometer based motion sensor.
The sensitivity of tow alert detection can be changed by editing the various decision thresholds
using the TOWP command. The format of the command is as follows
$TOWP,<distance_metres>,<speed_kmh>,<speed_seconds>,<motion_sensitivity>,
<trembler_sensitivity>
Field
Description
Range
<distance_metres>
distance travelled from the
last ignition off position that
will trigger a tow alert
0
disables distance check
100–65535 default=500
<speed_kmh>
speed threshold to trigger a
tow alert. The speed must
exceed the threshold for the
time in the
<speed_seconds> field to
trigger an alert.
0
disables speed check
20 – 65535 default=50
<speed_seconds>
time for which the speed
must be above the threshold
in the field <speed_kmh> to
trigger a tow alert.
1– 65535
default=10
<motion_sensitivity>
accelerometer based motion
detection sensitivity for
triggering a tow alert.
0
disables accelerometer
based motion detection
1 – 10
(1=most sensitive,
10=least sensitive,
default=5)
<trembler_sensitivity> Tremble sensor based
motion detection sensitivity
for triggering a tow alert.
0
disables trembler based
detection
1 – 10
(1=most sensitive,
10=least sensitive
default=5)