Multi-Tech Systems ISIHP-4U, ISIHP-4SD manual Terminal adapter does not respond to commands

Troubleshooting

This chapter covers common problems you may have with your ISIHP and how to solve them. The ISIHP was thoroughly tested at the factory before shipping. If you are unable to connect successfully, or if you experience data loss or garbled characters, during connecting, it is possible the modem or terminal adapter is defective. However, it is more likely that the source of your problem lies elsewhere. Always make sure all hardware is connected properly. Then review the common problems listed in this chapter for recommendations on what to change or do. Problems you may encounter include the following:

•The TA/modem does not respond to commands.

•The TA/modem dials but cannot make a connection.

•You can place data calls but not voice calls, or vice versa.

•You cannot place two simultaneous data calls.

•The TA/modem disconnects while online.

•The TA/modem cannot connect when answering.

•File transfer appears slower than it should be.

•Data is being lost

•There are garbage characters on the monitor

If you experience problems, please check the following possibilities before calling Tech Support (see Chapter 6).

The terminal adapter does not respond to commands

•Make sure you issue commands from the data communications software, either automatically or manually, in terminal mode. (You cannot send commands to the TA/modem from the DOS prompt.)

•Make sure you are in terminal mode in your data communications program; then type AT and press ENTER. If you get an OK response, your connections are good and the problem likely is in your phonebook entry or session settings.

•If you don’t get an OK, the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications programs connect to the COM port automatically. Some connect when the software loads and remain connected until the program ends. Others, like MultiExpress Terminal, can

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