Multitech MT5634ZBA-USB Betriebsanweisung PDF herunterladen (Seite 27)

Chapter 7 – Troubleshooting

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide (S000286G) 27

Data Is Being Lost

• If you are using data compression and a high speed serial port, set the serial port baud rate to two to six times

the data rate.

• Make sure the flow control method you selected in software matches the method selected in the modem.

• Try entering the I11 command or the &V command in command mode to display information about the last

connection, making a screen print of the connection statistics, and checking for parameters that might be

unacceptable.

There Are Garbage Characters on the Monitor

• Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have

connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.

• You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again; you

might get a better connection the second time.

• At speeds above 2400 bps, the remote modem might not use the same transmission or error correction

standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error

correction, however, line noise can cause garbage characters.)

• Try entering the I11 command or the &V command in command mode to display information about the last

connection, making a screen print of the connection statistics, and checking for parameters that might be

unacceptable.

The Modem Doesn’t Work with Caller ID

• Caller ID information is transmitted between the first and second rings, so if autoanswer is turned off (S0=0) or if

the modem is set to answer after only one ring (S0=1), the modem will not receive Caller ID information. Check

your initialization string, and if necessary change it to set the modem to answer after the second ring (S0=2).

• Make sure that you have Caller ID service from your telephone company.

NOTE: The modem supports US Bellcore standard caller ID only.

Fax and Data Software Can’t Run at the Same

Time

• Communication devices can be accessed by only one application at a time. In Windows 2000 and higher, you

can have data and fax communication applications open at the same time, but they cannot use the same

modem at the same time.

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Multitech MT5634ZBA-USB Betriebsanweisung Seite 27