Hello,
If you can use Hyperterminal as in the below steps to find & open the port then FaxMan Jr should be able to detect the port and use it. If these steps fail then the configuration is incorrect and Faxman jr wont be able to use the port.
Open Hyperterminal
1st Dialog: Give the session some name: "foo"
2nd Dialog: Connect using the COM port NOT the modem name
3rd Dialog: Accept all the default settings.
Once you are in the terminal window, type "AT" and hit ENTER.
Do you get an OK back? If so, the FaxMan should be able to detect and use this port. If not, review A. and B. above.