GS-818 GPS/GSM/GPRS Vehicle Tracker User Manual
48 Copyright © 2011 San Jose Technology, Inc. All Rights Reserved.
Jamming Detection
Generally, GPS jammer (signal blocker) is illegal radio frequency transmitter that is designed to block, jam, or interfere
with authorized radio communications.
Jamming technology generally does not identify desirable and undesirable communications. A jammer can block all radio
communications on any device that operates on radio frequencies within its range by emitting radio frequency waves that
interfere with the targeted device communications.
The jamming alarm is also able to be cleared for new detection if the previous detection is misjudged.
For example, entering the SMS command as the following allows user to enable or disable jamming detection function.
Setup format: #
「
User Name
」
,
「
Password
」
,
「
JD
」
,
「
Enable/Disable
」
*
Command: #username,0000,JD,1*
Table: Jamming Setup Format Description
Table: Jamming 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.
JD
Mode “JD” defines the jamming detection function.
0 Disable jamming detection.
1 Enable jamming detection. (default value)
0/1/clear
clear Clear the jamming alarm and start new detection
*
End sign.
Situation
Response
Setup Succeeds
username, JD setup OK.
Incorrect function code
username, JD setup fail.
