HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 86)

[Data] Data is always FF (in Hex)
Acknowledgement
[l][][Set ID][][OK/NG][Data][x]
[Data] The data means used hours.
(Hexadecimal code)
31. Temperature value (Command: d n)
To read the inside temperature value.
Transmission
[d][n][][Set ID][][Data][x]
[Data] Data is always FF (in Hex)
Acknowledgement
[n][][Set ID][][OK/NG][Data][x]
[Data] The data is 1 byte long in Hexadecimal.
32. Lamp fault Check (Command: d p)
To check lamp fault.
Transmission
[d][p][][Set ID][][Data][x]
[Data] Data is always FF (in Hex)
Acknowledgement
78 Appendix C Command reference ENWW