I think I figured this out by looking at the connectors on the back of the RFX. These are just hardwired connectors which have very tiny screws that you hard wire directly to it by tightening down the screws to form a clamp on the wire.

To do video sensing, I found a box called a Clear Blue Video Sensor model VS-A which you feed a composite video signal to. It also has one of these crazy little phoeinix connectors coming out the back of it which I am assuming you hard wire to the 9600. The video sensor does differentiate between +,-; although the 9600 does not. I am assuming it does not matter for the 9600 other wise they would have labled it.