In any case, what my installer did was steal a four conductor speaker wire that was in the vicinity for some yet to be installed speakers. Low voltage installers have no formal training on electrical codes and concepts, they just know hey + to +, – to -, we got us some serialz woohoo. It doesn’t mention that RS485 could present a very serious issue with ground differential if it’s being wired to a device with both grounds connected together, or between devices with a dissimilar ground, which is very possible given the use case would often involve pool and/or sprinkler equipment, which could be in an adjacent building. It’s just like hey, plug your serial crap in using our pin-outs and you’re good to go. combined with the lack of meaningful guidance from the home automation vendor Elan Nortek Security & Control LLC, maker of the Elan G! system my home uses. This was likely the fault of my A/V installer having no clue about electricity, serial comms, etc. I recently had a power surge come through my Pentair IntelliTouch-based pool control system, destroying its control board, and unfortunately destroying the control module of my home automation system on the other side of a serial connection into it.
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