I thought I would answer my own post since I have now had time to interact with the LCD's and figure out the protocol information. The ethernet protocol to control the sets is the same as the RS232 protocol; however, the port used to control them is port 9761. I don't know how they came up with or selected that port, but I was able to figure it out using a combination of LG's software that comes with the LCD and Wireshark. Anyway, I hope someone else finds this information useful.