GS-818 GPS/GSM/GPRS Vehicle Tracker User Manual
38 Copyright © 2011 San Jose Technology, Inc. All Rights Reserved.
Over Speed Detection
GPS receivers calculate the speed using algorithms in the Kalman filter. Most receivers compute speed by a combination
of movement per unit time and computing the Doppler shift in the pseudo range signals from the satellites.
GS-818 provides Over Speed Detection. User can also set up detection time for wrong Over Speed report prevention.
It will send an Over Speed report when GPS data shows the speed is over the defined speed limit. This command allows
the user to define the Over Speed detection time and speed limit in order to trigger the event.
Setup format
:
#
「
User Name
」
,
「
Password
」
,
「
Function Code
」
,
「
Enable/Disable
」
,
「
Speed Limit km/hr
」
,
「
Detection
Time
」
,
「
Buffer Time
」
*
Command: #username,0000,overspeed,1,60,5,25*
Table: Over Speed Detection Setup Format Description
Table: Over Speed Detection Setup Response Description
SMS Text
Description
#
Start sign.
username
Default user name of the device.
If you have changed the username, please use the updated one.
0000
Default password.
If you have changed the password, please use the updated one.
overspeed
Mode ‘overspeed’ defines over speed setup mode
1 Enable Over Speed Detection
0/1
0 Disable Over Speed Detection
60
Speed Limit in km/hr. In this case, it is 60km/hr
5
Over Speed Detection Time. In this case, the device will send an Over Speed report when it
keeps over speed for more than 5s.
25
Buffer Time to start the next over speed detection. In this case, if an over speed report is
sent, the device will wait for 25s and then detect if the speed exceeds the limit.
*
End sign.
Situation
Response
Success
username, Overspeed setup OK.
Incorrect function code
username, Overspeed setup fail.