Multi-Tech Systems ISIHP-4SD Terminal adapter cannot connect when answering, Data is being lost

Troubleshooting

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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.

146 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD