HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 77)

This function, when controlling RS-232C, locks the remote control and the local keys.
Transmission
[k][m][][Set ID][][Data][Cr]
[Data] 0: Off
1: On
Acknowledgement
[m][][Set ID][][OK][Data][x]
[Data] 0: Off
1: On
14. Balance (Command: t)
To adjust the sound balance.
Transmission
[k][t][][Set ID][][Data][Cr]
[Data] Min: 00H to Max: 64H
(Hexadecimal code)
00H: Step L50
64H: Step R50
Acknowledgement
[t][][Set ID][][OK][Data][x]
[Data] Min: 00H to Max: 64H
00H: Step 0 to L50
64H: Step 100 to R50
ENWW Transmission/Receiving Protocol 69