Belkin P73213-A User Manual page 15

Certain serial mice may not function properly through
the ExpressBus
The most important part about making sure a serial device will
work on your computer is to be certain that you have the
correct serial cable. External modems require a straight-through
cable, while serial printers require a crossed cable.
Connecting serial devices to the ExpressBus
to indicate to the software the correct serial port. For instance,
when installing an external modem, be sure to select the "Serial
on USB" port as shown below:
USB Serial Port
™ Plus Serial Port.
14
™ Plus requires you