I finished setting up my LG rs232 tv last night and it took a while to get into working order. Fortunately LG is really good about giving their serial port settings and commands in their product manuals free from their site.
My model is a 60PV250.
Using template LG>Plasma/LCD/Projectors>232 controlled [newer models]
I had to assign this to my CORE and not to The core/hybrid
specified com method was /ttyS0
changed a few commands to match the manual, 01 and 00 were swapped for power on, [k][a] for
changed the delay between commands, I noticed the tv only taking a few or the first command when a sequence was sent
removed some commands for tuner control as my setup has this device as end of the line display only. I do not pull any video back off its tuners