US Robotics Sportster Flash x2 User Manual page 30

The problem may be with the modem you first tried to call.
If your modem doesn't connect at 2400 bps with a 2400 bps
modem,
· The remote modem might be an older 2400 bps modem that
does not support error control. Disable error control with the
following command: AT&M0<Enter>
· Try connecting with the remote modem again.
· When the call is finished, remember to reset the modem:
ATZ<Enter>
During data transfer...
If your screen displays random or garbage characters,
· Set your software to the same word length, parity, and Stop bits
as the remote modem.
· Make sure that your software and modem are set to the same
flow control setting and to either a fixed or variable serial port
rate.
· Type the following command to load the template that enables
hardware flow control as well as other optimal settings.
AT&F1<Enter>
· Disable any Terminate and Stay Resident (TSR) programs
running in the background.
If your communications software is reporting many Cyclic
Redundancy Check (CRC) errors and low Characters Per Second
(CPS),
· You might have a bad phone line. Place the call again. The
phone company routes calls differently each time you call.
· Type the following command to load the template that enables
hardware flow control as well as other optimal settings:
AT&F1<Enter>
· Lower the serial port rate in your communications software to
38,400 bps or 19,200 bps.
· Try a different file transfer protocol (do not use Xmodem if other
protocols are available). Disable any Terminate and Stay
Resident (TSR) programs running in the background.
26 Sportster Flash x2 - User's Guide