NEC LCD4020-BK-AV - 40IN LCD 1200:1 1366X768 60HZ Dvi-d 8MS Manual page 29

70: Standby-power digital +3.3V abnormality
71: Standby-power +5V abnormality
72: Main-power panel +12V abnormality
73: Main-power +2.5V abnormality
74: Main-power +1.8V abnormality
75: Standby-power analog +3.3V abnormality
76: Main-power analog +3.3V abnormality
77: Main-power digital +3.3V abnormality
78: Power-good signal +4.2V abnormality
80: Cooling fan-1 abnormality
81: Cooling fan-2 abnormality
82: Cooling fan-3 abnormality
90: Inverter 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 number.
1) The controller requests the monitor to read a serial number.
Header
SOH-'0'-Monitor ID-'0'-'A'-'0'-'6'
Header
SOH (01h): Start Of Header
'0' (30h): Reserved
Monitor ID: Specify the Monitor ID which you want to get serial number.
Ex.) If Monitor ID is '1', specify 'A'.
'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 the serial No. data to the controller.
Header
SOH-'0'-'0'-Monitor ID-'B'-N-N
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'.
'B' (42h): Message type is "Command reply".
N-N: Message length
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
(29/40)
Check code Delimiter
BCC CR
Check code Delimiter
BCC CR