3Com Courier, Reference

Page: 129 / 204

Dial Using V.25 bis Software 16-7
Alternatively, you can combine all the previous commands into a
compound command, like this:
AT&M7&N10%N10X1S0=1&W
This tells the modem to use the HDLC protocol for dialing, an offline
clock speed and connection rate of 19200 bps, display extended result
codes, auto answer incoming calls, and write these settings to NVRAM.
6
Set DIP switch 10 OFF and then power the modem OFF, and then ON.
Setting DIP switch 10 OFF causes the modem to read the settings you just
made from NVRAM, enabling synchronous operation.
Dialing Using V.25 bis Your communications software, which must support V.25
bis
, handles the
dialing. Once the synchronous connection is made and the modem is in
synchronous mode, V.2
bis commands are no longer necessary and are
ignored. For dialing instructions, refer to the manual included with your
communications software.
Hanging Up Since your 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 modem to disconnect is to drop its Data Terminal
Ready (DTR) signal. Either power off the Courier V.Everything modem or
use your communications software (check the software user’s manual for
instructions).
Returning to
Asynchronous Mode
Once you've completed a synchronous session, you can switch back to
asynchronous mode by flipping DIP switch 10 ON and then turning the
power of the Courier V.Everything modem back on. The Courier
V.Everything modem cannot switch between synchronous an
asynchronous modes while a call is connected