NEC LCD4620-2-IT LCD4020/4620/5220/6520, M40/M46 external control commands - Page 28

'0'-'6'(30h, 36h): Program No.7 EN: Enable /Disable '0'-'0'(30h, 30h): Disable '0'-'1'(30h, 31h): Enable 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 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 SOH-'0'-Monitor ID-'0'-'A'-'0'-'4' STX-'B'-'1'-ETX BCC Delimiter 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 SOH-'0'-'0'-Monitor ID-'B'-N-N Message STX-'A'-'1'ST(0)-ST(1) --------ST(n)-ETX Check code Delimiter BCC 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 00: Normal (28/40)