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Chapter 5 – Troubleshooting
MT5634ZLX, MT5634ZLXI, MT5634ZLX/FE User Guide 27
The Software Does Not Control the Modem Properly or Cannot Detect the Modem
• Cause: The software may not have been set up correctly.
Solution: Check the initialization string and dial string.
• Cause: Some TSRs (programs that stay in memory after they are loaded) may conflict with the
communications software.
Solution: Try starting your computer without loading any TSRs.
Doubled Characters on the Screen
• Cause: Both the modem and the software have the echo feature turned on.
Solution: Since only one needs an echo, turn the software echo feature off.
• Cause: The remote modem is echoing your typed characters.
Solution: Type ATE1 then Enter at the command line. Then turn off the software echo
feature.
No Text Appears on the Screen in Data Mode
• Cause: The remote modem is not echoing your typed characters.
Solution: Type ATE0 and press Enter at the command line. Then turn the software echo feature
on.
• Cause: Your software may not be set to use Full Duplex or the remote modem may not be set to
use Full Duplex either.
• Cause: The remote modem may be waiting for you to type a command before it replies with text.
No Text Appears on the Screen When in Command Mode
Solution: If you can’t see the typed characters, then type ATE1 then press Enter.
The Modem Does Not Dial a Phone Number After AT Dial Command Execution
• Cause: If you are using touch tone dialing on a phone line that requires pulse dialing, then it may
not work.
Solution: Use ATDT in place of ATDP.
Communications Software Dials, But Fails
• Cause: Make sure the software-dialing prefix is ATDT.
• Cause: Make sure the software and modem are set to the same COMx port.
• Cause: The modem may not have hung up the phone line since the last call.
Solution: Change to Command mode and type ATH then press Enter.
The Modem Connects with Some Modems, But Not Others
• Cause: The remote modem may not support data compression or error correction, which might
cause it to take too long to negotiate a link.
Solution: You might try changing the way the modem negotiates by using the AT&Qn, ATNn,
and ATS37=n commands. It might be best to start with AT&Q0N1.