LG BH5F-M 86" 4K UHD Ultra-Stretch Digital Signage Commercial Monitor - Manual (Page 109)

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Transmission/Reception Protocol
Transmission
(Command1)(Command2)( )(Set ID)( )(Data)(Cr)
* (Command1): This command is used to identify between the adjustment setting or the user adjustment modes.
* (Command2): This command is used to control the monitor.
* (Set ID): Used for selecting a set you want to control. A unique Set ID can be assigned to each set ranging from 1 to
1000 (01H to 3E8H) under Settings in the OSD menu. Selecting '00H' for Set ID allows the simultaneous
control of all connected monitors. (The maximum value may differ depending on the model.)
* (Data): Transmits command data. Data count may increase depending on the command.
* (Cr): Carriage Return. This parameter corresponds to '0 x 0D' in ASCII code.
* ( ): White Space. This parameter corresponds to '0 x 20' in ASCII code.
Acknowledgment
(Command2)( )(Set ID)( )(OK/NG)(Data)(x)
* The product transmits an ACK (acknowledgment) based on this format when receiving normal data. At this point,
if the data is FF, it indicates the present status data. If the data is in data write mode, it returns the data of the PC
computer.
* If a command is sent with Set ID '00' (=0 x 00), the data is reflected to all monitors and they do not send an
acknowledgment (ACK).
* If you send "FF" as the value of the data in control mode via RS-232C, you can check the value currently set for the
relevant feature (not applicable to some features).
* Some commands may not be supported on some models.