LG M4714C-BA Owner's Manual

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Controlling the Multiple Product
RS-232C
A26
43. S/W Version (Command : f z) 
Check the software version. 
Transmission
[f][z][][Set ID][][Data][Cr]
Data FFH : Read
Acknowledgement
[z][][Set ID][][OK/NG][Data][x]
Transmission / Receiving Protocol
44. Input Select (Command : x b) 
To select input source for the Set.
Transmission
[x][b][ ][Set ID][ ][Data][Cr]
Data  20H : AV
40H : Component 1         
41H : Component 2         
60H : RGB (PC)                 
90H : HDMI/DVI (DTV)
A0H : HDMI/DVI (PC)
Acknowledgement
[b][ ][Set ID][ ][OK][Data][x]
Data  20H : AV
40H : Component 1         
41H : Component 2         
60H : RGB (PC)                 
90H : HDMI/DVI (DTV)
A0H : HDMI/DVI (PC)