HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 69)

02. Input Select (Command: b) (Main Picture Input)
To select input source for the Set.
You can also select an input source using the INPUT button on the remote control.
Transmission
[k][b][][Set ID][][Data][Cr]
[Data] 7: RGB (PC)
8: HDMI/DVI (HD-DVD)
9: HDMI (PC)
A: DisplayPort (HD-DVD)
B: DisplayPort (PC)
Acknowledgement
[b][][Set ID][][OK][Data][x]
[Data] 7: RGB (PC)
8: HDMI/DVI (HD-DVD)
9: HDMI (PC)
A: DisplayPort (HD-DVD)
B: DisplayPort (PC)
ENWW Transmission/Receiving Protocol 61