I have a large complex house (600 amp power, 11 switchboards). I have most X10 signals with multiple transceivers (several for each house code A, B, C - I also have bridges and repeaters on each of the 3 main services). A switch could not be activated easily, so this second CM15A with house code P is used to send a macro for codes A and B. I just set up a separate file on AHP and plugged the USB into it, programmed it and just plugged it into the AC outlet near the complex switch on the same phase of that panel. So far no problem when using several CM15A.
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