HP LD4220tm and LD4720tm Digital Signage Touch Displays

[Data] 0: Off
1: (static level 1)
2: (static level 2)
3: (static level 3)
Acknowledgement
[I][][Set ID][][OK/NG][Data][x]
46. Power Indicator (Command: f o)
To set the LED for Power Indicator
Transmission
[f][o][][Set ID][][Data][Cr]
[Data] 0: Off
1: On
Acknowledgement
[o][][Set ID][][OK/NG][Data][x]
47. Serial no. Check (Command: f y)
To read the serial numbers
Transmission
[f][y][][Set ID][][Data][Cr]
[Data] Data FF (to read the serial numbers)
Acknowledgement
[y][][Set ID][][OK/NG][Data1]to[Data13][x]
[Data] The data format is ASCII Code.
ENWW Transmission/Receiving Protocol 89