Please forgive me, but I haven't really done X10 stuff since the year 2000 or so, and internet searches don't turn up what I need.
I just discovered my Powerhouse TM751's will bridge signal from one leg of my house to the other, and now I can actually use X10 stuff for more than the one or two things on the leg that Indigo is plugged into.
I am pretty dang sure that back in the day with XTENsion, I could send commands to the transceivers on my system. They only have letter address though, not a Number & Letter address.
Do they only respond to ALL ON/OFF commands, or what? How can Indigo command them?
Edit: Found and tried the "Use whole house code" option, and that didn't do anything.