LG M4225C Owner's Manual page 65

RS-232C
Transmission / Receiving Protocol
11. Sharpness(Command : k) (Video Timing only)
To adjust the screen Sharpness.
You can also adjust the sharpness in the Picture menu.
Transmission
Data Min : 00H to Max : 64H
(Hexadecimal code)
Refer to 'Real data mapping' page A7.
*
Acknowledgement
Data Min : 00H to Max : 64H
12. OSD Select(Command : l)
To control OSD on/off to the set.
Transmission
Data 0 : OSD Off
Acknowledgement
Data 0 : OSD Off
13. Remote Lock /Key Lock (Command : m)
To control Remote Lock on/off to the set.
This function, when controlling RS-232C, locks the remote control and the local keys.
Transmission
Data 0 : Off 1 : On
Acknowledgement
Data 0 : Off 1 : On
Controlling the Multiple Product
1 : OSD On
1 : OSD On
A10