User`s manual

U.S. Robotics I-modem Command Reference
Analog Synchronous Applications • Page 16-9
commands are no longer necessary and are ignored. For dialing instructions, refer to the
manual included with your communications software.
Hanging Up
Since the I-modem cannot accept commands once it is connected in synchronous mode,
you cannot use the ATH (hang-up) command or the +++ escape code.
The only way for the I-modem to disconnect is to drop its Data Terminal Ready (DTR)
signal. Either power off the I-modem or use your communications software (check the
software userÕs manual for instructions).
Returning to Asynchronous Mode
Once you've completed a synchronous session, you can switch back to asynchronous
mode by ßipping DIP switch
1 OFF and then ON. The I-modem cannot switch between
synchronous and asynchronous modes while a call is connected.
V.25bis Reference
Note The commands and result codes described in this section are sent and rec-
ognized by your V.25bis communications software. You are not expected to
send them to the I-modem the way you do with AT commands.