I have the Furuno nmea data converter and I am trying to figure out what to do with the eight leads coming from it aside from the three that are already connected together. My NMEA output port from my radar and its connector has 5 pins. Two are Data out, one is data in, one is data common and one is NC. Can you tell me which leads to attach and what to do with the other leads. I attached the diagrams that came with both equipment.