User's Manual GSM Terminal GT340
Device Description
3.3 LED indicators
LEDs on the front panel indicate the presence of the power supply voltage and activity of the
GSM network.
Following table describes device status depending on LED PWR presentation:
Name
State
Presentation
Description
PWR
(green)
Device is OFF
Continuously OFF
Device is ON
Continuously ON
Following table describes GSM status depending on LED GSM presentation:
Name
State
Presentation
Description
GSM
(red)
No network coverage,
not registered
Continuously OFF
Registered home
2G network
Cyclically High for 100 ms, Low for 2 s
Registered roaming
2G network
Cyclically High for 100 ms, Low for
100 ms, High for 100 ms, Low for 2 s
Voice or data 2G
call enabled
Continuously ON
IMPORTANT:
It is necessary to insert a SIM card and attach GSM antenna to enable
GSM LED to light up. Built-in GSM module has general purpose pin for driving LED GSM.
By default this pin is set for network status indication. If for some reason the LED does not
light, check and if necessary set the function using the AT command “ AT+UGPIOC=16,2
↲ ”.
Save setting to non volatile memory using AT command “ AT&W
↲ ”.
Turn off device by issuing
↲
command “ AT+CPWROFF ”, to safely save parameters in NVM (Non Volatile Memory).
Please refer to the “u-blox AT Commands Manual” for more details about AT commands.
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