I've been working with the Cablemax FTDI USB a RS-232/RS-422/RS-485 converter. I'll try again but with an old computer with serial port. I only want to make an hoistway scan and check some faults, will work If use a normal serial cable (db9) and then a conector to db25? I don't have the orange cable, but I think that cable only is neccesary for the door adjustment.