curiousB

Newbie here.. Helping my brother with an upgrade to his pool. He has an inground spa/pool using a Jandy Aqualink RS control system. We upgraded the system to add in the iAqualink capability so he can control the system from his smart phone or the internet. Since his system was REV K firmware the install required a new logic board and the iAqualink module (WiFi). The new board brought the system Firmware to Rev R and everything works great. The iAqualink is pretty cool for anyone on the fence thinking about it. Anyway through this process we obviously have a spare controller card with vintage Rev K firmware. I am wondering if we can re-purpose that controller PCB to configure it to do the function of a 7306+ Auxiliary Power Center w/micro Controller so it can control a secondary Auxiliary Power center with another bank of relays/contactors. You see he only has one more unused Aux relay open. With the ability to control the system remotely (iAqualink) it really starts opening up other items to control in the yard/house (landscape lighting zones to name just one). I chatted with Zodiac customer support but I was told a controller board cannot be an auxiliary controller yet in a manual they show these W1 and W2 jumper (Aqualink Doc 6919 page 18) settings to do exactly that. So I am a little confused. My questions then are: Can the controller card be turned from a master to slave for an auxiliary power center (APC) by setting the jumpers on it? If so can a Rev K be used for the lesser auxiliary controller function and still be compatible with the REV R system controller? My thinking is the lesser functionality of a Auxiliary controller is to just communicate over the bus and control relay state. The prime controller has most of the system smarts. I was thinking that lower functionality in REV K as a APC controller might be fully compatible with new Rev R firmware in the main controller. The person said our primary system could not support beyond Aux 8 anyway so even if we bought a fully kitted out and new APC it wouldn't work?!! This seemed odd to me as the APCs are precisely for this, to expand control beyond the first controller. Can't you add at least two APCs to a system to expand to Aux 8, 9, 10, .... Aux 23, 24. Does the APC communicate over the 4 wire controller bus as the control pad (Grn, Yel, Blk, Red) wires? Are all devices just in parallel (or daisy chained) and some type of protocol runs over this bus? Anyway any guidance would be appreciated. Thinking we can get another few Aux relays equipped for not too much $$$.