User`s manual

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13.2 Auto Brightness Parameter Write
Send Auto Brightness Parameters from Host( PC or Primary Monitor) to Slave (Secondary) Monitors.
1) Write Parameters from PC to Monitor.
Header Message Check code Delimiter
SOH-'0'-'*'-'0'-'A'-'0'-'8' STX-'C'-'2'-'2'-'2'–[VAL
_H]-[VAL_L]-ETX
BCC CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'*' (2Ah): Monitor ID
(Use ‘*’ as “ALL” for Broadcasting of parameter)
'0' (30h): Message sender is the controller
'A' (41h): Message type is "Command"
'0'-'8'(30h, 38h): Message length.
Message
STX (02h): Start of Message
'C' -'2' -'2' -'2' (43h,32h,32h,32h): Auto Brightness Parameter Write command
VAL_H–VAL_L: Auto Brightness setting parameter
bit0: LIGHT FROM BACK (1:Yes,0:No)
bit1: BACK WALL (1:Near,0:Far)
bit2: FRONT SENSOR (1:On,0:Off)
bit3: BACK SENSOR (1:On,0:Off)
bit4:Saturation(1:On,0:Off)
bit5:Video Detect(1:On,0:Off)
bit6-7:Not used
VAL_H: ASCII code of bit4-7of data
VAL_L: ASCII code of bit0-3 of data
Example) If Bit0 =1, Bit1 =1 and the other bits =0 (00000011b),
then VAL_H='0'(0x30) and VAL_L='3'(0x33).
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.
Delimiter
CR (0Dh): End of packet
2) Reply from Monitor to PC.
Basically, No need reply because it is broadcasting request.
[only for reference if the write command is done with certain destination ID]
Header Message Check code Delimiter
SOH-'0'-'0'-'A'-'B'-'0' -'A' STX-'C'-'3'-'2'-'2'-[RES]-[RES]-[VAL_H]
-[VAL_L]–ETX
BCC CR
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
'A' (41h): Monitor ID
'B' (42h): Message type is "Command reply "
'0' -'A' (30h, 41h): Message length.
Message
STX (02h): Start of Message
'C'-'3'-'2' -'2' (41h, 33h, 32h,32h): Auto Brightness Parameter Write reply Command
RES: Result code('0'-'0'(30h, 30h):Normal,
、 '0'-'1'(30h, 31h):Abnormal)
VAL_H-VAL_L: Auto Brightness setting parameter
bit0: LIGHT FROM BACK (1:Yes,0:No)
bit1: BACK WALL (1:Near,0:Far)
bit2: FRONT SENSOR (1:On,0:Off)
bit3: BACK SENSOR (1:On,0:Off)