LG M4720C Owner's Manual page 62

RS-232C
Transmission / Receiving Protocol
07. Contrast(Command : g)
To adjust screen contrast.
You can also adjust the contrast in the Picture menu.
Transmission
Data Min : 00H to Max : 64H
Acknowledgement
Refer to 'Real data mapping' page A7.
*
08. Brightness(Command : h)
To adjust screen brightness.
You can also adjust the brightness in the Picture menu.
Transmission
Data Min : 00H to Max : 64H
* Refer to 'Real data mapping' as shown below.
Acknowledgement
Refer to 'Real data mapping' page A7.
*
Controlling the Multiple Product
A8
A8