I've used rti with an elan system 6. Similar scenario I believe to integrating with Russ CAV66. Each port out needs to be two wire spliced into each zoned keypad ir/ground wires. I used a 66 telephone punch block to keep my splices clean and organized. One of my rti outputs I ran to a xantech ir connecting block first so i had enough other outputs to run my other equipment that didn't need ir routing. Much easier to hook up with rs-232 if you can figure out the programming.