HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 73)

08. Brightness (Command: h)
To adjust screen brightness. You can also adjust the brightness in the Picture menu.
Transmission
[k][h][][Set ID][][Data][Cr]
[Data] Min: 00H to Max: 64H
Refer to “Real data mapping” as shown below.
Acknowledgement
[h][][Set ID][][OK][Data][x]
Real data mapping 0: Step 0
:
A: Step 10
:
F: Step 15
10: Step 16
:
64: Step 100
09. Color (Command: i) (Video Timing only)
To adjust the screen color. You can also adjust the color in the Picture menu.
Transmission
[k][i][][Set ID][][Data][Cr]
[Data] Min: 00H to Max: 64H
(Hexadecimal code)
ENWW Transmission/Receiving Protocol 65