Visioneer PaperPort MX User Manual page 29

An internal remote device adapter (IRDA), common in laptop
computers, might be set to act as this COM port causing it to be
disabled. See your laptop computer's owner's manual for information
about how to disable the IRDA and re-enable the external COM port.
The port itself may be faulty or disabled. Refer to your computer
owner's manual for the steps to determine if the port is enabled. If your
computer has another port available, try using it instead.
The address Windows sets for the COM port may be incorrect. To see
the address that Windows 3.1 sets for the COM port, open the Control
Panel, select Ports and then Settings. To see the address that Windows
95 sets for the COM port, open the Control Panel, select System, then
Device Manager, and Ports (COM & LPT). Note the COM port
address, and then compare it with the hardware address. The two should
be the same. You can find the hardware address for Windows 3.1 using
its Microsoft System Diagnostics (MSD) program. Quit Windows, then
type MSD at the DOS prompt. Click OK to continue, then select
COM Ports to see the hardware addresses. MSD is not supplied with
Windows 95. Contact your computer dealer for assistance.
The internal modem is using the same port as your scanner.
An internal modem acts as another COM port. To avoid a conflict,
determine which COM ports are currently installed in your computer.
Then be sure that the new serial card is not configured to add a COM port
that is already installed. For example:
If your computer has COM1 and COM4 and an internal modem on
COM2, then configure the first port on the serial card to be COM3 and
disable the second port.
If your computer has COM1 and COM2 and an internal modem on
COM3, then disable the first port on the serial card and configure the
second port to be COM4.
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