We're not using the Art Mode off command at all, just kicking it back to HDMI on both TV's. The other TV works as expected with On/Off etc.
Why wouldn't Samsung just have two separate buttons? Whatever. That does emulate the remote where a short power press turns on art mode and a long press turns the TV fully off. That IR On command drives the TV straight to art mode, then we have to flip it to HDMI to watch TV.
The one that won't turn back on we ended up sticking a blinker on it just for power on, an annoying fix but it is working. It's possibly a setting in the TV, but once Covid-19 struck I never went back to the house and had to depend on the other guys still going on site for info and setup. One of them will not turn on after being turned off via 232. Art Mode Off - \x08\x22\x0B\x0B\x0E\x00\xB2 Now that being said, the two TV's on site act differently.
