NEC LCD Monitor Manual 

Also see for LCD Monitor: Control guide

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NEC LCD Monitor Manual  Manual pdf 123 page image

(123/137)22.2 Security Enable WriteThis command is used in order to write the setting of Security Enable.1) The controller requests the monitor to set Security password.Header Message Check code DelimiterSOH-'0'-Monitor ID-'0'-'A'-'1'-'C'STX-'C'-'A'-'0'-'C'-'0'-'1'-ENA-‘0’-‘0’-PWD1-…-PWD8-ETXBCC CRHeaderSOH (01h): Start of Header'0' (30h): ReservedMonitor ID: Specify the Monitor ID of which you want to change a setting.Ex.) If Monitor ID is '1', specify 'A'.'0' (30h): Message sender is the controller.'A' (41h): Message type is "Command".'1'-'C'(31h,43h): Message length (28byte)MessageSTX (02h): Start of Message'C'-'A'-'0'-'C' (43h, 41h, 30h, 43h): Security Password Command'0'-'1' (30h, 31h): Enable WriteENA: Enable/Disable00h (30h, 30h): Disable01h (30h, 31h): Enable'0'-'0' (30h, 30h): ReservedPWD1 – PWD8: Password dataETX (03h): End of MessageCheck codeBCC: Block Check CodeRefer to the section 4.5 “Check code” for a BCC calculation.DelimiterCR (0Dh): End of packet2) The monitor replies a written in result.Header Message Check code DelimiterSOH-'0'-'0'-Monitor ID-'B'-'0'-'A'STX-'C'-'B'-'0'-'C'-'0'-'1'-ST-ETX BCC CRHeaderSOH (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’, replying monitor’s ID is ‘1’.'B' (42h): Message type is "Command reply".'0'-'A'(30h,41h): Message length (10byte)MessageSTX (02h): Start of Message'C'-'B'-'0'-'C' (43h, 42h, 30h, 43h): Security password Reply Command'0'-'1' (30h, 31h): Enable WriteST: Error Status00h: No Error01h: ErrorETX (03h): End of Message