LG Serial Control TVs
From LinuxMCE
See Also: LG 42LB5D
Leave the TV set to ID 1, which is the factory default, and use a cross over cable. Then it is plug and play.
The manual explaining the protocol can be found here on page 73: http://us.lge.com/download/product/file/1000002412/20LS7D_manual.pdf