Graphtec says that the usb port in my machine will not work no matter what i do. he suggested I buy a usb to serial port cable. I ran out to Tiger Direct and purchased this although the packaging says usbto db25 female paralel printer cable. It looks correct and hooks up right, but I dont have it connected via the paralel port but the serial port which seems to fit the cable.... who knows any of this stuff. My mind is melting ...it's been many years since I had to deal with serial or paralel.