User`s manual

U.S. Robotics I-modem Command Reference

Testing • Page 14-11

tal loopback mode. If you are using an external I-modem, the MR status light ßashes

during this operation.

5. Type a short message. It will be looped back to your I-modem by the remote device and

to your screen for veriÞcation. (The remote user will not see your data.)

6. Send the escape code, +++, and then ATS16=0 to end the test.

If you issue an invalid command, the I-modem sends an ERROR message. If you set

If you wish to resume data transmission with the remote device, add the O command

after the ATS16=0 string to return online. If you do this, bear in mind that error control

is disabled. Because error control is negotiated during the connection sequence, its sta-

tus cannot be changed until the I-modem is back on hook and in Command mode

7. Send AT&M4, unless you used a reset command (ATZ or ATZ!).

Testing Using a Built-in Test Pattern (S16=4)

Starting Testing That Uses the Test Pattern

The test pattern is available at all speeds. At 300 bps, the I-modem's serial port rate must

be Þxed (&B1) and the link rate Þxed at 300 bps (&N1). At rates over 9600 bps, just set

the I-modem for a Þxed serial port rate (&B1).