User's Manual GSM Terminal GT340
Troubleshooting
6 Troubleshooting
6.1 The PWR LED does not light
Check if the voltage of power supply is in the range of 8-30V DC
Check if the power connector is properly inserted
Check if the power supply polarity is not reversed
6.2 The GSM LED does not light
Check if valid micro SIM card has been inserted properly
Check if the SIM card has been locked (refer to AT+CPIN command in chapter 4.1.2)
Check if the external antenna has been connected properly to the terminal
Check if the network coverage is available
Check if the GSM LED is properly mapped (refer to AT+UGPIOC command in
chapters 3.3 and 4.1.2)
6.3 The terminal does not respond
Check if the RS232 cable has been connected properly
Check if the terminal program has proper setting. Factory default of GT340 is:
- Auto baud rate detection (issue “ AT
↲
” in uppercase to adjust baud rate of the GT340)
- 8 data bits
- no parity bit
- 1 stop bit
- RTS/CTS hardware control
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