HP LD4730 and LD4730G LCD Ultraslim Bezel Digital Signage Displays Command Reference Guide

Transmission
[j][a][][Set ID][][Data][Cr]
[Data] 0: Local dimming off
1: Local dimming on
Acknowledgement
[a][][Set ID][][OK][Data][x]
05. Backlight (Command: m g)
To control the brightness of the backlight.
Transmission
[m][g][][Set ID][][Data][Cr]
[Data] Min: 00H to Max: 64H
Acknowledgement
[g][][Set ID][][OK][Data][x]
06. Volume Control (Command: k f)
To adjust Volume.
Transmission
[k][f][][Set ID][][Data][Cr]
[Data] Min: 00H to Max: 64H
(Hexadecimal code)
Acknowledgement
[f][][Set ID][][OK][Data][x]
ENWW Transmission/Receiving Protocol 7