This option will request the IFT2000 to send a 'Port Test' string.  This string will be displayed in the window of the form as it is received.  If the serial port is correctly configured and connected to the IFT2000, the string returned should be identical to the text displayed in blue letters on the form.  If no string is returned, try checking the computer serial port with some other device which is known to be working, or, check the serial cable. The cable IS NOT a NULL modem cable. See section 3.3.d of the IFT2000 operator's manual for correct wiring, or order a SSC-1 serial cable from your dealer.