i am saving the serial port for future printer app. but what i am trying to to do connect to the three pin connecter on channel 1. I am already connecting to he 8 pin round unit of channel 1, but to use that one i have have the panel door open. Termial i mentioned has a 9 pin, a RJ45, and and outlet in it. I wish to connect the 5/04 to the terminal (mounted on the outside of panel) so then i can connect to the plc from outside the panel. Also trying to do this without purchasing any special cables.