NEC X981UHD External Control Codes - Page 116
Security Enable
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21. Security Enable 21.1 Security Enable Read This command is used in order to read the Security Enable. 1) The controller requests the monitor to read Security Enable Header SOH-'0'-Monitor ID'0'-'A'-'0'-'8' Message STX-'C'-'A'-'0'-'C'-'0'-'2'-ETX Check code BCC Delimiter CR Header SOH (01h): Start of Header '0' (30h): Reserved Monitor 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". '0'-'8'(30h, 38h): Message length (8byte) Message STX (02h): Start of Message 'C'-'A'-'0'-'C' (43h, 41h, 30h, 43h): Security password Command '0'-'2' (30h, 32h): Enable Read 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 Security Enable to the controller. Header SOH-'0'-'0'-Monitor ID'B'-'0'-'A' Message STX-'C'-'B'-'0'-'C'-'0'-'2'-EN-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', replying monitor's ID is '1'. 'B' (42h): Message type is "Command reply". '0'-'A'(30h,41h): Message length (10byte) Message STX (02h): Start of Message 'C'-'B'-'0'-'C'-'0'-'2' (43h, 42h, 30h, 41h, 30h, 32h): Get Security Enable Disable Reply EN: SECURE MODE 00h (30h, 30h): OFF 01h (30h, 31h): START-UP LOCK 02h (30h, 32h): CONTROL LOCK 03h (30h, 33h): BOTH LOCK ETX (03h): End of Message Check code BCC: Block Check Code (116/130)