Multi-Tech Systems MT5600BL User Manual download pdf (Page 89)

8 Solving Problems

Data Is Being Lost

If you are using data compression and a high speed serial port, set the serial port

baud rate to four times the data rate.

Your UART might not be reliable at serial port speeds over 9600 bps or 19,200

bps. Turn off data compression, reset your serial port speed to a lower rate, or

replace your serial port with a faster one.

Make sure the flow control method you selected in software matches the method

selected in the modem. If you are using the modem with a Macintosh, you might

have the wrong cable for hardware flow control.

If you are running under Windows 3.1 and have a 16550AFN UART, you might

need to turn on the 16550’s data buffers and/or replace the Windows serial driv-

er, COMM.DRV.

Try entering the &V1 command 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 transmis-

sion 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 &V1 command 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 ini-

tialization 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.

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Multi-Tech Systems MT5600BL User Manual Page 89