HP LD4730 and LD4730G LCD Ultraslim Bezel Digital Signage Displays Command Reference Guide

Transmission
[v][d][][Set ID][][Data][x]
[Data] A text string up to 64 characters long.
Acknowledgement
[d][][Set ID][][OK/NG][Data][x]
30. Operating time (Command: d l)
To read the hours of operating time.
Transmission
[d][l][][Set ID][][Data][x]
[Data] Data is always FF (in Hex)
Acknowledgement
[l][][Set ID][][OK/NG][Data][x]
[Data] The data means used hours.
(Hexadecimal code)
31. Thermal value (Command: d n)
To read the inside temperature.
Transmission
[d][n][][Set ID][][Data][x]
[Data] Data is always FF (in Hex)
Acknowledgement
ENWW Transmission/Receiving Protocol 17