Chapter 4 – Troubleshooting and Frequently Asked Questions
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Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide
How do I make an Internet connection to my dial-up ISP?
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Make sure you have CSD service.
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Create a dial-up connection to the ISP’s access number, then use your account username and password and
choose the wireless modem as the device.
How does faxing work?
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GPRS modems support Class 1 and Class 2 Group 3 faxing.
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You need fax services setup on your account. You should receive a separate phone number for fax just like
voice and data, and you must call the fax number for the modem to receive a fax.
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You also need fax software (we do not have working software). WinFax Version 10 has been tested with
success.
I can’t make outgoing calls. I just receive a NO CARRIER response.
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Make sure the antenna is connected and SIM is inserted correctly.
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Check signal and registration: ‘AT+CSQ’ (10-31 is good), ‘AT+CREG?’ (0,1 is registered & 0,5 is roaming).
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Check NO CARRIER reason with ‘AT+CEER’. Look up error code in Reference Guide.
The modem will not answer.
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To have modem autoanswer, set modem with ‘ATS0=1’ and ‘AT&W’ to store the setting.
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Send ‘ATA’ to the modem once the RING is indicated on the terminal screen.
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You may need to set modem to ignore DTR, ‘AT&D0’, if you aren’t providing DTR.
I am trying to make a GPRS connection using a Windows dial-up session. It connects and then immediately disconnects.
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Make sure the APN is configured in the modem correctly (The APN is provided by the provider).
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Check the APN with ‘AT+CGDCONT?’ To make sure it is correct.
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If no APN is inserted, then insert the correct APN using the command ‘AT+CGDCONT=1,”IP”,”<APN>”’ with
HyperTerminal or add it into the “Extra Initialization Commands:” in the modem’s properties.
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Make sure the APN is correct for your account.
When I try to establish a GPRS connection using Windows dial-up I get an error: “Hardware Failure”.
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Check the modem to make sure it is installed and can be queried in the modem’s properties.
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Make sure the com port is not being held by another application. Look for the TR light indication. If it is on,
most likely another application is holding on to the port.
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Make sure the dial-up connections maximum speed matches the modem’s properties maximum port speed.
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Try rebooting the PC.
What is the maximum amount of characters I can use to send an SMS message?
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Supports up to 160 characters maximum.
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In PDU mode using 7-bit, the modem still supports 160 characters, but in 8-bit the modem supports only 70
characters.
After changing the +CNMI, +CSCA, or +CSMP command values, the modem doesn’t store them.
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When changing these command values, you must use the +CSAS command to store the changes.
