I have often said we have virtually 100% reliability with our X10 system. Our controller issues hundreds of commands a day, and it is very rare that we note that something is not in the expected state. Last night was one of those.
Our landscape lights normally switch on at deep dusk and off at 10:30 PM. Last night I saw them switch off just before 9:00 PM. Since we were having a rare heavy rain here, I thought the GFI powering the transformer might have tripped. That was not the culprit.
I looked at the Ocelot log, and noted an unexpected X10 OFF command for the landscape lights. Since that uses a different housecode from the interior lighting that can be controlled manually, only the Ocelot or a Leviton 16400 are able to issue that command. So, it was not the cat stepping on a Palmpad. It couldn't have been my XTB-IIR because that is now on my workbench being used as a test bed for the forthcoming firmware upgrade. (I’m currently using my prototype XTB to boost the Ocelot’s PSC05 output.)
Checking the X10 activity map, there are no unusual devices that might indicate X10 is in use at a nearby home. So, I have to chalk this one up to an unexplained X10 event, possibly due to the powerline noise that I described previously. I am anxiously waiting to see if this occurs again so I can hopefully track it to its source.
Jeff