6-10 Netopia ISDN Modem User’s Guide
About autobaud
Autobaud automatically detects your computer’s serial port current
data rate, up to 115.2 Kbps (autobaud does not support 230.4
Kbps transmissions).
To set the baud rate to the maximum speed of 230.4 Kbps, first
make sure your computer’s serial port and your communications
software support 230.4 Kbps transmission speed. Then send the
following command to the Netopia ISDN Modem: AT $B 230400.
Change the setting of your application program to 230400 bps. If
you are using a Macintosh computer, start up the ISDN Setup
application and set the baud rate to 230.4 Kbps. (For more
information, see the “Configuration using a Macintosh computer”
section on page 5-2.)
If you are using the Windows configuration program, autobaud must
be enabled to access the Netopia ISDN Modem configuration dialog
box. If the baud rate is set to a specific rate (such as 230.4 Kbps),
you will not be able to access the configuration dialog box.
Before you set the ISDN modem to a specific baud rate, make sure
the configuration dialog box parameters are set correctly. To return
to autobaud mode, set the baud rate of your communications
program to the baud rate you defined for the ISDN modem and then
send the following AT command: AT$B0. This sets the ISDN modem
to autobaud. If you are still unable to access the configuration
dialog box, press and hold down the “a” key on the keyboard and
press the RESET key on the back of the ISDN modem. Hold the “a”
key down until the ISDN modem comes back on line and then
release the key.