NEC UN552S External Controls - Page 83
Self diagnosis
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13. Self diagnosis 13.1 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 Delimiter code SOH-'0'-Monitor ID- STX-'B'-'1'-ETX BCC CR '0'-'A'-'0'-'4' 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 4.3 "Check code" for a BCC calculation. Delimiter CR (0Dh): End of packet 2) The monitor replies a result of the self-diagnosis. Header Message SOH-'0'-'0'-Monitor ID- STX-'A'-'1'- 'B'-N-N ST(0)-ST(1) --------ST(n)-ETX Check code BCC Delimiter CR 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'-'1'(39h, 31h):91: LED Backlight abnormality 'A'-'0'(41h, 30h):A0: Temperature abnormality - shutdown 'A'-'1'(41h, 31h):A1: Temperature abnormality - half brightness (83/145)