HP LD4245tm 41.92-inch Interactive LED Digital Signage Display - Manual (Page 93)

NOTE: During USB operations such as EMF, all commands except Power(k a) and Key(m c) are
not executed and treated as NG.
Transmission / Receiving protocol
Transmission
[Command1][Command2][ ][Set ID][ ][Data][Cr]
* [Command1]: First command to control the set.
* [Command2]: Second command to control the set.
* [Set ID]: Set ID with which you want to communicate. Enter [Set ID] = ‘00(0x00’ to communicate
with all sets regardless of their Set ID numbers.
* [Data]: Information passed to the set.
* [Data1]: Information passed to the set.
* [Data2]: Information passed to the set.
* [Data3]: Information passed to the set.
* [Cr]: Carriage Return. ASCII code ‘0x0D’.
* [ ]: ASCII code space ‘0x20’
Acknowledgement
[Command2][ ][Set ID][ ][OK/NG][Data][x]
* When the product receives data normally, it sends an acknowledgement (ACK) in the format above.
If data is in read mode, it indicates the data that shows the current status. If data is in read mode, it
simply indicates the data that is sent from the computer.
* If a command is sent with Set ID '00' (=0x00), the data is reflected to all display and they do send an
acknowledgement (ACK).
* If the data value 'FF' is sent in control mode via RS-232C, the current setting value of a function can
be checked (only for some functions).
* Some commands are not supported depending on the model.
01. Power (Command: k a)
To control the Power On/Off the display.
Transmission
[k][a][ ][Set ID][ ][Data][Cr]
Data
00 : Power off
01 : Power on
Acknowledgement
[a][ ][Set ID][ ][OK/NG][Data][x]
Transmission / Receiving protocol 83