Thanks for the reply. It included just fine (admin console and module status indicator show that it's included), but then nothing. I tried with a second module - same problem. Tried excluding then including as a latched output (for bench testing) and still the same issues - nothing. It seems like it's not getting along with the ISY (v.5.0.11B). Sometimes I can write and read a parameter with no problem. Other times it gets hung up. I tried a Restore and I get "PLATFORM_ERRORS--7". When I do a query on the sensor (with nothing connected) or the switch, I either get no response or a "Request Failed" error. I haven't seen this anywhere in the documentation, but an input isn't required for output operation, is it?