Not trying to rain on anyone's RS232 parade here , but I do feel that some times we all try to crack a walnut with a sledgehammer just because we feel its the more professional approach...

We have installed many, many, Samsungs (European) and spent a LOT of time with RS232. We worked out that we needed TTL level converters in some instances and not in others, we worked out that some commands seemed to need carriage returns and not others, and that adding CRs to some commands would lock out the port for short time, we worked out that we couldn't find commands for numbers or a reliable one for smart hub, and that some input commands were just different between models. We worked out that there was no meaningful feedback that could be used, so 2-way comms were worthless, and that some sets just wouldn't power on after being turned off (presumably due to the service port being powered down although we couldn't find any menu that allowed us to change that). We also worked out that the total lack of any reward programmatically did not justify the time spent dicking around with it!

Ultimately we worked out that the most comprehensive and reliable means of control was in fact IR. All of the commands are there including discrete input power and smart hub. Volume works smoothly, and with the numbers being available we could program preset stations.

On top of that in 95% of cases we found we could actually install the emitter out of sight on the back of the case, and with a drop of hot glue it would stay there indefinitely.

So it may be worth re-evaluating whether it really is imperative to go to RS232?

Just saying...no doubt the flaming will now begin in earnest ;-)

Merry Christmas!!