Multi-Tech Systems ISIHP-2U - Manual (Page 146)

Troubleshooting
146 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
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The terminal adapter cannot connect when answering
• Autoanswer may be disabled. Turn on autoanswer in your data
communications program, or send the command ATS0=1 to your TA
in terminal mode.
Note: To accept calls while DTR is low, configure the TA to ignore DTR by
entering AT&D0<cr>. Configured this way, the TA accepts calls while DTR
is low. Otherwise the TA rejects incoming calls until DTR is high while the
calls come in.
File transfer appears slower than it should
• If you have a Universal Asynchronous Receiver/Transmitter (UART)
that is compromising data throughputs, we recommend you replace it
with a special I/O card.
• If you are running under Windows 3.1 and have a 16550AFN UART,
you must replace the Windows serial driver, COMM.DRV, to take
full advantage of the UART’s speed.
• Check the serial port baud rate in your communications software and
make sure it is set as high as your UART allows.
Data is being lost
• Your UART may not be reliable at serial port speeds over 9600 bps
or 19,200 bps. Reset your serial port speed to a lower rate or replace
your serial port with a faster one.
• Check the serial port baud rate in your communications software, and
make sure it is set as high as your UART allows.
• Make sure the flow control method you selected in software matches
the method selected in the TA.
There are garbage characters on the monitor
• Your computer and the remote computer may be set to different
parities. Check with the remote system with which you are
communicating and set your communications software to use the
same parity as the remote system. communicating and set your
communications software to use the same parity as the remote
communicating and set your communications software to use the
same parity as the remote system.