US Robotics COURIER Instrukcja Użytkownika Pobierz pdf (Strona 178)

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U.S. Robotics I-modem Command Reference

Troubleshooting • Page 15-4

The I-modem wonÕt dial

Check your communications softwareÕs manual to Þnd out which Data Terminal Ready

(DTR) setting it requires. You may need to change the DTR setting at the I-modem. If so,

see Chapter 6, Controlling EIA-232 Signaling

Hear ringing, but the I-modem wonÕt answer

¥ Check your communications softwareÕs manual to Þnd out what DTR operations your

software requires. Also, for external I-modems, look at the TR LED to make sure your

terminal or computer is sending a DTR signal via the EIA-232 interface.

¥ Send ATI4 to the I-modem and check that S0 is set to a value higher than 0.

¥ Set &F and S0=1, then try again.

The I-modem acts as though a data link has been established, but no call was

received,

Carrier Detect (CD) may be overridden (with &C0), but your system may require that the

override be turned OFF (with &C1). Review your communications software manual to see

what CD operations are required.

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