I have successfully connected up the Konnected board to the 4 zones of my existing old NX-4, and can see the zone status change in SmartThings as I walk around the house. Cool!
Now, it would be great to be alerted if an alarm goes off. The NX-4 does not seem to have a dedicated alarm output pin to hook up to, however it has auxiliary outputs that are used to drive the siren and the strobe.
The alarm system install manual attached, page 36/37 has board details if anyone would like a look