HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 85)

Data
(Hex) MODE
04 Sport
05 Game
Acknowledgement
[y][][Set ID][][OK/NG][Data][x]
29. Fan Fault check (Command: d w )
To check the Fan fault of the display.
Transmission
[d][w][][Set ID][][Data][x]
[Data] Data is always FF (in Hex)
Data ff: Read Status
Acknowledgement
[w][][Set ID][][OK/NG][Data][x]
[Data] [Data] is the status value of the Fan fault.
0: Fan fault
1: Fan OK
2: N/A (Not Available)
30. Elapsed time return (Command: d l)
To read the elapsed time.
Transmission
[d][l][][Set ID][][Data][x]
ENWW Transmission/Receiving Protocol 77