Motorola SM56 ∙ The modem does not respond to AT commands, Select If You Have a Hardware Conflict

∙You cannot enter tone selections successfully when calling tone-driven applications

1. When dialing a remote system that requires you to enter selections using the telephone keys,

such as a voice-mail	depot or bank-account information provider, you can lengthen the
duration of the tones your modem sends, so that the		remote system can detect them better.
To adjust DTMF tone length, use the AT+VTDn command, where n specifies			the tone
duration.

∙The modem does not respond to AT commands

1.Ensure that your communications software is configured to use the same COM port as the modem's COM port.

2.Reset modem parameters to default options by entering AT&F; then re-enter custom options.

3.SM56 builds after Build 50 require setting the S46 register to 23 before AT&T1 will perform the Local Analog Loopback (LAL) hardware test.

∙The modem responds to commands, but they do not appear on the screen

Ensure that the local display echo option is enabled by entering ATE1.

∙You've installed a new peripheral device; now the modem does not work

1.In the Windows desktop tray, select Start.

2.Select Help. The Windows Help Topics window appears.

3.Select the Contents tab.

4.Select If You Have a Hardware Conflict.

5.A series of troubleshooting actions appears. Follow the appropriate sequence.

∙You hear feedback (noise) from the PC sound system (Data/Fax/Speakerphone modems)

1.Position the speakers at least three feet (1 M) away from the microphone.

2.Ensure that the speakers are facing away from the microphone.

3.Turn down the speaker volume.