Geofences (GEOF)
Device based geofences can be configured with the GEOF command, which has 5 arguments as
follows:
$GEOF,<index>,<type>,<radius>,<latitude>,<longitude>
Field
Description
Range
<index>
geofence index
1 - 100
<type>
geofence type
0
disabled
1
alarm on entry
2
alarm on exit
3
alarm on entry &
exit
<radius>
geofence radius in metres
20 - 65535
<latitude>
geofence latitude, WGS84 decimal degrees
-90.0 to +90.0
<longitude>
geofence longitude, WGS84 decimal degrees
-180.0 to +180.0
Entering the command with index argument only will echo back the existing geofence settings.
Acceleration and Deceleration Maximum Thresholds (ACMX & DCMX)
Report events can be triggered on specified thresholds of acceleration and deceleration (i.e.
braking). ACMX specifies the acceleration threshold in m/s/s * 10, integer format. DCMX
specifies the deceleration threshold in m/s/s * 10, integer format.
Example:
$ACMX,35
set accel threshold at 3.5 m/s/s
$DCMX,45
set decel threshold at 4.5 m/s/s
Cornering Maximum Thresholds (ACMY & DCMY)
Report events can be triggered on specified thresholds of cornering force. ACMY and DCMY
specify the cornering threshold in m/s/s * 10, integer format.
Example:
$ACMY,35
set cornering accel threshold at 3.5 m/s/s
$DCMY,45
set cornering decel threshold at 4.5 m/s/s
Collision Event Threshold (COLN)
This parameter defines the acceleration/deceleration threshold (on any axis) to be classified as a
collision event. COLN specifies the threshold in m/s/s * 10, integer format.
Device Orientation (ORTN)
This parameter defines the AT240 installation orientation in order to allow corrections to be
applied to the accelerometer X/Y data to ensure data is correctly orientated with the vehicle axis.
When ORTN is specified correctly (as per the table below) X data will correspond to vehicle
acceleration and deceleration and Y will correspond to cornering forces (+ve Y corresponding to a
left turn and -ve Y for right hand turns).
ORTN
AT240 Installation Position
Data Corrections Applied
0
unspecified
No X/Y orientation corrections applied
1
connector facing to vehicle LHS
No X/Y orientation corrections applied
2
connector facing to vehicle rear
X/Y swapped & X axis sign inversion
3
connector facing to vehicle RHS
Both X and Y axes sign inversions
4
connector facing to vehicle front
X/Y swapped & Y axis sign inversion
