NCLink shows port 3 being the only one that it accepts.I assume port 3 then is the serial port as no other port option will work. If I try any other port I get an error code and told to try another port. When I use port 3 I get info on baud:9600 ,bits:7,parity:even, start at computer setting , flow control setting and a message of "Ready to send!" It then shows send activity when I hit start but it shows that even if the DB25 cable is disconnected. WTH? I get a "waiting for machine" message when trying to send program from machine to nc program. I assume that shows I have no connection with the control.