GTM-204M-4G Series User’s Manual v1.1
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3.3 LED Indicators
There are two LED indicators to help users to judge the various conditions of
GTM-204M-4G. The description is as follows
：
A. PWR(Red)
：
The PWR LED can indicate the status of Power module.
Power normal
Power fail
Always ON
Always OFF
B. 4G (Green)
：
The modem LED can indicate the status of GSM module.
4G module normal
4G module fail
Data transmission
ON 2 sec and OFF 1 sec
OFF
or
ON 1 sec and OFF 2
sec
Blinking per 0.2 sec
4G module normal
4G module fail
1
2
3
4
5
6
7
ON
OFF
Time(sec)
ON
OFF
Time(sec)
1
2
3
4
5
6
7
