I cant seem to get any communication going between my computer and machine (control is cnc 88HS) Ive tried the test plug it shows the cnc is working right and a test of the cable also shows no problems. Im using bobcad V20 and my settings are 7 even 1- XON/XOFF@ 2400 baud. I have a cable that came with the machine its got some king of board and switch on it I dont know whats its for. Any help would be appreciated.