Error opening comports / comport(1)

[Belinda Frick]

Check the following:

You may have another instance of PABX3 that is already
running or another program has the COM port open.

Close the other program or other PABX3 and try again.

Multiple Windows logins on the PC can also cause this error.
ALSO SEE: PABX3 is not receiving data

Using the wrong port number, can cause this error. Check which port
numbers are available.
ALSO SEE: How do I check for the port number to use?

Make sure that you are using a serial cable (9 or 25 pin).

Check that your serial cable is wired correctly.

If the PC is running in safe mode, then all the comports
will be locked.