Troubleshooting 51
THE “COM PORT IS EITHER IN USE OR UNAVAILABLE” OR “PORT NOT
OPEN” ERROR MESSAGE APPEARS.
An incorrect Interrupt Request Line (IRQ) may be assigned to the
COM port. Most computers have pre-assigned an IRQ# to each
COM#. These include the following:
■COM1 and IRQ4
■COM2 and IRQ3
■COM3 and IRQ4
■COM4 and IRQ3
If PC Card Services has assigned different combinations for the
COM port and IRQ, you must reassign these numbers accordingly.
To reassign your COM port and IRQ, use PC Card Services or the
appropriate settings utility for your operating system.
THERE IS A POSSIBLE CONFLICT BETWEEN THE PC CARD AND YOUR SERIAL
MOUSE.
Perform the following test:
1. Remove your Netopia ISDN PC Card from your PC Card slot
and re-insert it.
2. Activate a terminal emulation program.
3. Enter $Xmit. Press Enter until the PC Card responds with the
following display:
NetopiaCard Xmit test: Enter to start, Enter to stop
4. Press Enter again. The card will continuously transmit this
line:
ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijkl
To check if there is a conflict with the mouse, move the mouse
around during the Xmit test. If this causes the transmission to
stop or display meaningless characters on your screen, there is
probably a conflict, and the mouse driver must be removed or
reconfigured to another IRQ.