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NEC MultiSync V422 Control Manual Page 21

External control.
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CR (0Dh): End of packet
Step 3. The controller request the monitor to change the Backlight setting
Header
SOH-'0'-Monitor ID-'0'-'E'-'0'-'A'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID of which you want to change a setting.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h): Message sender is the controller.
'E' (45h): Message Type is "Set parameter command".
'0'-'A' (30h, 41h): Message length is 10 bytes.
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Operation code page number is 0.
'1'-'0' (31h, 30h): Operation code is 10h (in the page 0).
'0'-'0'-'5'-'0' (30h, 30h, 35h, 30h): Set Backlight setting 80(0050h).
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
Step 4. The monitor replies with a message for confirmation.
Header
SOH-'0'-'0'- Monitor ID -'F'-'1'-'2'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller.
Monitor ID: Indicate a replying Monitor ID.
Ex.) When this byte is set to 'A', the replying Monitor ID is '1'.
'F' (46h): Message Type is "Set parameter reply".
'1'-'2' (31h, 32h): Message length is 18 bytes.
Message
STX (02h): Start of Message
'0'-'0' (30h, 30h): Result code. No error.
'0'-'0' (30h, 30h): Operation code page number is 0.
'1'-'0' (31h, 30h): Operation code is 10h (in the page 0).
'0'-'0' (30h, 30h): This operation is "Set parameter" type.
'0'-'0'-'6'-'4' (30h, 30h, 36h, 34h): Backlight max value is 100(0064h).
'0'-'0'-'5'-'0' (30h, 30h, 35h, 30h): Received a Backlight setting was 80(0050h) .
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
Repeat Step 1 and Step 2, if you need to check the Backlight setting. (Recommended)
Step 5. Request the monitor to store the Backlight setting. (Save Current Settings Command)
Message
STX-'0'-'0'-'1'-'0'-'0'-'0'-'5'-'0'-ETX
Message
STX-'0'-'0'-'0'-'0'-'1'-'0'—'0'-'0'-'0'
-'0'-'6'-'4'-'0'-'0'-'5'-'0'-ETX
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Check
Delimiter
code
BCC
CR
Check code
Delimiter
BCC
CR

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