NEC LCD3215 - MultiSync - 32" LCD Flat Panel Display Control Manual page 29

'A' (41h): Monitor ID
LCD3215/LCD4215 must be ASCII 'A' (41h).
'B' (42h): Message type is "Command reply "
N-N: Message length.
Note.) The maximum data length that can be written to the monitor at a time is 32bytes.
Ex.) The byte data 20h is encoded as ASCII characters '2' and '0' (34h and 30h).
Message
STX (02h): Start of Message
'A'-'1' (41h, 31h): Application Test Report reply command
ST: Result of self-tests
00:Normal
70:Analog 3.3V abnormality
71:Analog 12V abnormality
72:Analog 5V abnormality
73:Audio amplifier +12V abnormality
80:Cooling fan-1 abnormality
81:Cooling fan-2 abnormality

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
12. Serial No. & Model Name Read
12.1 Serial No. Read
This command is used in order to read a serial No..
1) The controller requests the monitor to read a serial No.
Header
SOH-'0'-'A'-'0'-'A'-'0'-'6'
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
'A' (41h): Message type is "Command"
'0'-'6'(30h, 36h): Message length.
Message
STX (02h): Start of Message
'C'-'2'-'1'-'6' (43h, 32h, 31h, 36h): Serial No. command
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) The monitor replies a data for confirmation.
Header
SOH-'0'-'0'-'A'-'B'-N-N
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller
The byte data 70 is encoded as ASCII characters '7' and '0' (37h and 30h).
STX-'C'-'3'-'1'-'6'-
Data(0)-Data(1)---Data(n)-ETX
Message
STX-'C'-'2'-'1'-'6'-ETX
Message
(29/37)
Check code
Delimiter
BCC CR
Check code Delimiter
BCC CR