applications
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+VTD
n
command, where
n
specifies the tone duration. Check the SM56 online
Help (via the SM56 Helper application on the Windows Desktop Tray) for a list of supported AT
Commands.
•
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.
•
The modem responds to commands, but they do not appear on the screen
1. Usually this is because the local echo is turn OFF. Turn it on by issuing ATE1 and hit <Enter>.
•
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.
•
The modem connects; then meaningless characters appear
This is usually caused by Error correction turned off. To correct:
1. Open the
Control Panel.
Double click the
Modems
icon.
2. Click on the COM port that the
Motorola SM56...Modem
is installed on
3. Click on
Properties
.
4. Select
Connection
.
5. Click on
Advanced
.
6. Check the
Use Error Control-Required to Connect
box.
•
The modem cannot connect; the Error Control option is selected
The modem may be connecting at a rate higher than appropriate for the line conditions.
1. Use the AT%B command to limit the maximum connection rate. (For a list of AT commands,
refer to the on-line
User's Guide
.)
2. Lower the rate, using AT commands, until the problem is corrected. You can add AT commands
