NEC RS-232C manual Self diagnosis, Self-diagnosis status read

11. Self diagnosis

11.1 Self-diagnosis status read

This command is used in order to read the Self-diagnosis status.

1) The controller requests the monitor to read Self-diagnosis status.

	Header	Message	Check code	Delimiter
SOH-'0'-Monitor ID-'0'-'A'-'0'-'4'		STX-'B'-'1'-ETX	BCC	CR
Header
SOH	(01h): Start of Header
'0'	(30h): Reserved

Monitor ID: Specify the Monitor ID which you want to get status. Ex.) If Monitor ID is '1', specify 'A'.

'0' (30h): Message sender is the controller.

'A' (41h): Message type is "Command".

'0'-'4'(30h, 34h): Message length

Message

STX (02h): Start of Message

'B'-'1' (42h, 31h): Self-diagnosis 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 result of the self-diagnosis.

Header	Message	Check code	Delimiter
SOH-'0'-'0'-Monitor ID-'B'-N-N	STX-'A'-'1'-	BCC	CR

ST(0)-ST(1) --------ST(n)-ETX

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

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 '0'-'0'(30h, 30h):00: Normal

'7'-'0'(37h, 30h):70: Standby-power +3.3V abnormality

'7'-'1'(37h, 31h):71: Standby-power +5V abnormality

'7'-'2'(37h, 32h):72: Panel-power +12V abnormality

'7'-'8'(37h, 38h):78: Inverter power/Option slot2 power +24V Abnormality

'8'-'0'(38h, 30h):80: Cooling fan-1 abnormality

'8'-'1'(38h, 31h):81: Cooling fan-2 abnormality ('8'-'2'(38h, 32h):82: Cooling fan-3 abnormality) '9'-'0'(39h, 30h):90: Inverter abnormality '9'-'1'(39h, 31h):91: LED Backlight abnormality 'A'-'0'(41h, 30h):A0: Temperature abnormality – shutdown

'A'-'1'(41h, 31h):A1: Temperature abnormality – half brightness

'A'-'2'(41h, 32h):A2: SENSOR reached at the temperature that the user had specified.

'B'-'0'(42h, 30h):B0: No signal

'C'-'0'(43h, 30h):C0: Option board abnormality

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