NEC UN552S External Controls - Page 89
Security Lock
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15. Security Lock 15.1 Security Lock Control This command sets the condition of security lock function to "LOCK" or "UNLOCK". If security pass codes 1st to 4th are matched with monitor resisted pass codes, then this command is executed, and reply no error status and a new condition. If codes aren't matched with them then setting isn't changed, and reply error status and a current condition. If the monitor receives this command while waiting for Pass codes inputs, then it only checks Pass cords (and releases image muting if Pass codes are OK) and doesn't apply "EN" parameter. 1) The controller requests the monitor to set the condition of security lock. Header Message Check Delimiter code SOH-'0'-MonitorID- STX-'C'-'2'-'1'-'D'- BCC CR '0'-'A'-'1'-'0' EN-P1-P2-P3-P4-ETX 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". '1'-'0'(31h, 30h): Message length Message STX (02h): Start of Message 'C'-'2'-'1'-'D' (43h, 32h, 31h, 44h): Security Lock Control command EN-P1-P2-P3-P4: Lock condition control data EN: Enable /Disable '0'-'0'(30h, 30h): Disable '0'-'1'(30h, 31h): Enable P1: Security Pass code 1st '0'-'0'(30h, 30h): "0" | '0'-'9'(30h, 39h): "9" P2: Security Pass code 2nd '0'-'0'(30h, 30h): "0" | '0'-'9'(30h, 39h): "9" P3: Security Pass code 3rd '0'-'0'(30h, 30h): "0" | '0'-'9'(30h, 39h): "9" P4: Security Pass code 4th '0'-'0'(30h, 30h): "0" | '0'-'9'(30h, 39h): "9" 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 (89/145)