NEC LCD3215 - MultiSync - 32" LCD Flat Panel Display Control Manual page 11

Delimiter
CR (0Dh): End of packet
Step 2. The monitor replies with current Brightness setting and capability to support this operation.
Header
SOH-'0'-'0'-'A'-'D'-'1'-'2'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
'A' (41h): Monitor ID
LCD3215/LCD4215 must be ASCII 'A' (41h).
'D' (44h): Message Type is "Get 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): Brightness max value is 100(0064h)
'0'-'0'-'3'-'2' (30h, 30h, 33h, 32h): Current Brightness setting is 50(0032h) as 50 %
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 3. The controller request the monitor to change the Brightness setting
Header
SOH-'0'-'A'-'0'-'E'-'0'-'A'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'A' (41h): Monitor ID
LCD3215/LCD4215 must be ASCII 'A' (41h).
'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 Brightness setting 80(0050h) as 80 %
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.
Message
STX-'0'-'0'-'0'-'0'-'1'-'0'-'0'-'0'
-'0'-'0'-'6'-'4'-'0'-'0'-'3'-'2'-ETX
Message
STX-'0'-'0'-'1'-'0'-'0'-'0'-'5'-'0'-ETX
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Check code Delimiter
BCC CR
Check
Delimiter
code
BCC CR