I want a Konnected alarm panel (conversion, not running in parallel with the legacy alarm system) and I have about 17 sensors that I want to wire to separate zones. I assume that means I need an add-on board, connect it to the expansion connector on the Alarm Panel Pro, and then it’ll advertise all 18 zones or whatever to Home Assistant. But I can’t find any documentation that explains it. Is this how it works? Which products should I buy?
We do not have an expansion connector. The add-on board and Alarm Panel Pro board do not physically connect to each other. Each board operates independently, has it’s own IP address on the network, and reports its zones to HA.
Yes, to achieve 18 zones you could use one Alarm Panel Pro board and one 6-zone Add-on board, however they do not physically connect to each other (they can share a power supply if desired). All 18 zones would report into Home Assistant, and then you can use the Manual Alarm Control Panel component or Alarmo (3rd-party component) to build an alarm system using those 18 zones (and any other 3rd-party sensors) in HA.
Note that in this setup, the 6 zones that are driven via the Add-on board would connect via WiFi, not Ethernet.
Hi Nate, thanks for the quick reply! 
Okay, so if I wanted to stick with Ethernet (not WiFi) then I guess I’d need two Alarm Panel Pro’s. What are the two “expansion ports for interface module(s)” on the Alarm Panel Pro (Konnected Alarm Panel Pro 12-Zone Interface Kit) for then?
That’s correct, you would need two Pros to have all zones on Ethernet.
The ports are for connecting to our Interface Module, when used in-parallel with a traditional alarm system. this does not create more zones, it only allows the zones to be redirected through an interface module.