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Chapter 8

Troubleshooting

8.1 The modem’s LED does not light

– Check if the modem has been properly connected to a 5-32V power supply

– Check if the power connector is properly inserted

– Check the fuse in the power cord

8.2 The modem’s LED lights but does not blink long time after power up

– Check if a valid SIM card has been properly inserted

– Check if the SIM card has been locked (refer to AT+CPIN command in AT command guide)

– Check if the external power has been properly connected to the modem

– Check if the network coverage is available

– Make sure that the CTS and DTR pins of the serial port are not connected together

8.3 The modem does not respond to the terminal program

– Check if the RS232 cable has been properly connected

– Check if your program has proper settings. Factory setting of the modem is:

• 115200 bps

• 8 data bits

• No parity bit

• 1 stop bit

8.4 No voice could be heard for the modem’s speaker output when a call

is answered

– Make sure a voice call has been made (refer to AT command guide)

– Enter the AR+SPEAKER=2 command

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Maestro 100 Spezifikationen Seite 31