Specifications

GMT00 @Track Air Interface Protocol
TRACGMT100AN001 – 60 –
3.2.23. Jamming Detection
The command AT+GTJDC is used to configure the parameter for jamming detection. When the
detection condition is matched, the device will report +RESP:GTJDR event message to the
backend server.
 AT+GTJDC=
Example:
AT+GTJDC=gmt100,1,10,40,,,,,1,1,15,5,,0016$
Parameter
Length(byte)
Range/Format
Default
Password
4 – 6
'0' – '9' 'a' – 'z' 'A' – 'Z'
gmt100
Mode
1
0|1
0
Signal Threshold
<=3
0 – 255
10
C1 Threshold
<=3
0 – 255
40
Reserved
0
Reserved
0
Reserved
0
Reserved
0
Output ID
1
0 – 2
0
Output Status
1
0|1
Duration
<=3
0～255(×100ms)
0
Toggle Times
<=3
0 – 255
0
Reserved
0
Serial Number
4
0000 – FFFF
Tail Character
1
$
$
 <Mode>: Working mode.
 0: Disable this function.
 1: Enable this function.
 <Signal Threshold>, <C1 Threshold>: The built-in jamming detection algorithm uses these
two parameters to judge whether the device is currently being jammed. The smaller the
parameter, the more sensitive.
The acknowledgment message of AT+GTJDC command:
 +ACK:GTJDC,
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