User`s manual

U.S. Robotics I-modem Command Reference
Analog Synchronous Applications • Page 16-8
Note Due to the nature of synchronous dial-up, the I-modem auto-answers only
on the third or fourth ring.
6. Set the I-modem to enter clear-channel synchronous mode.
Example: AT*V2=4&W <Enter>
Alternatively, you can combine all the previous commands into a compound command,
like this:
AT&M7&N10%N10X1S0=1*V2=4&W <Enter>
This tells the I-modem to use the HDLC protocol
for dialing, an ofßine clock speed and
connection rate of 19200 bps, display extended result codes, auto-answer incoming
calls, enter clear-channel synchronous mode, and write these settings to NVRAM
.
7. Set DIP switch
1 ON and then power the I-modem OFF, and then ON. Setting DIP
switch 1 ON causes the I-modem to read the settings you just made from NVRAM,
enabling synchronous operation.
Dialing Using V.25bis
Your communications software, which must support V.25bis, handles the dialing. Once the
synchronous connection is made and the I-modem is in synchronous mode, V.25bis