LG M4720C Owner's Manual page 59

RS-232C
Transmission / Receiving Protocol
01. Power(Command : a)
To control Power On / Off of the Set.
Transmission
Data 0 : Power Off
Acknowledgement
To show the status of Power On / Off.
Transmission
Acknowledgement
Data 0 : Power Off
02. Input Select (Command : b) (Main Picture Input)
To select input source for the Set.
You can also select an input source using the INPUT
button on the remote control.
Transmission
Data 2 : AV
4 : Component
7 : RGB (PC)
8 : HDMI (DTV)
9 : HDMI (PC)
Acknowledgement
Data 2 : AV
4 : Component
7 : RGB (PC)
8 : HDMI (DTV)
9 : HDMI (PC)
Controlling the Multiple Product
1 : Power On
1 : Power On
A5