If someone psots the pertinent info from the casablance manual/spec on its wiring needs for RS232 I am sure someone can help.

Okay some one posted it. First of all if you want to understand what is going on go to my web site (see my profile) and pull down the document called Pronto PRO communications.

The Pronto extenders only use three pins. Ground, Transmit and receive.

The Theta document shows that certain pins need to be jumpered (electrically tied together) on its side, so just wiring three wires end to end will not work.

The Theta document states which pins are transmit and which are receive. The rule is that the transmit pin (2 or 3) on side A must go tro the Receive (2 or 3) pin on side B, and the receive pin (2 or 3) on side A must go to the transmit (2 or 3) pin on side B. The ground pin (5) is always wired straight through. THE ABOVE RULE ALWAYS HOLDS!!!
The Theta doc states which pin is Transmit and which is receive on their side. I do not use the RFX units so I am not sure of their pinouts, but I am sure it is documented.