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13.2 Auto Brightness Parameter Write
Send AutoBrightness 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: AutoBrightness 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 and 1 =1 and the other bits =0, (00000011)
VAL_H='0'(0x30) 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'(30h)-'0'(30h):Normal,
、
'0'(30h)-'1'(31h):Abnormal)
VAL_H-VAL_L: AutoBrightness setting parameter
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5 “Check code” for a BCC calculation.