3Com 56k User Manual page 25

Select this serial rate (sometimes called the "port
rate") in any communications software you use.
If this is your UART Select this serial rate
16550 115.2 or 57.6 Kbps
16450 38.4 Kbps
8250 19.2 Kbps
DO NOT select a 28,800, 14,400, or 12,000 bps
serial port rate if offered. Your modem will NOT work
correctly with any of these settings. Fix or lock the
serial port (baud) rate. If it is referred to as autobaud,
select OFF.
Congratulations!
You are now ready to start using your
3Com U.S. Robotics Message Modem
Software Installation
21