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Chapter 4 – Troubleshooting and Frequently Asked Questions
40 Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide
I am trying to make a GPRS connection using a Windows dial-up session. It connects and then
immediately disconnects.
● Make sure the APN is configured in the modem correctly (The APN is provided by the provider).
● Check the APN with ‘AT+CGDCONT?’ To make sure it is correct.
● 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.
● 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”.
● Check the modem to make sure it is installed and can be queried in the modem’s properties.
● 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 onto the port.
● Make sure the dial-up connections maximum speed matches the modem’s properties maximum
port speed.
● Try rebooting the PC.
What is the maximum amount of characters I can use to send an SMS message?
● Supports up to 160 characters maximum.
● In PDU mode using 7-bit, the modem still supports 160 characters, but in 8-bit the modem will
support only 70 characters.
After changing the +CNMI, +CSCA, or +CSMP command values, the modem doesn’t store them.
● When changing these command values, you must use the +CSAS command to store the changes.
How do I send an SMS message to an email account?
● When sending an SMS message to an email account, you must use a designated routing number that
will tell the SMS server to route your message to an email account. Here are the numbers that we
are aware of at this time:
AT&T = “0000”
T-Mobile = “500”
Here is an example of how to send an SMS message to an email account:
AT+CMGS=”0000”
> email@multitech.com My message goes here. <ctrl +Z>