NEC UN552S External Controls - Page 90
EN: Enable /Disable Current condition
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2) The monitor replies the result to the controller. Header Message SOH-'0'-'0'-Monitor ID'B'-'0'-'A' STX-'C'-'3'-'1'-'D'ST-EN-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". '0'-'A'(30h, 41h): Message length Message STX (02h): Start of Message 'C'-'3'-'1'-'D' (43h, 33h, 31h, 44h): Security Lock Control reply command ST-EN: Lock condition result data ST: Status '0'-'0'(30h, 30h): No error '0'-'1'(30h, 31h): Error EN: Enable /Disable (Current condition) '0'-'0'(30h, 30h): Disable '0'-'1'(30h, 31h): START-UP LOCK (Enable) '0'-'2'(30h, 32h): CONTROL LOCK '0'-'3'(30h, 33h): BOTH LOCK 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 (90/145)