NEC UN552S External Controls - Page 72
SOH 01h: Start of Header
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3) The controller requests the monitor to write Enable/Disable Schedule. Header Message Check code SOH-'0'-Monitor ID- STX-'C'-'2'-'3'-'F'-PG-EN-ETX BCC '0'-'A'-'0'-'A' 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'-'A'(30h, 41h): Message length Message STX (02h): Start of Message 'C'-'2'-'3'-'F' (43h, 32h, 33h, 46h): Enable/Disable Schedule writes command PG: Program No. '0'-'0'(30h, 30h): Program No.1 | '1'-'D'(31h, 44h): Program No.30 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 4.3 "Check code" for a BCC calculation. Delimiter CR (0Dh): End of packet 4) The monitor replies a data for confirmation. Header Message SOH-'0'-'0'-Monitor ID'B'-'0'-'C' STX-'C'-'3'-'3'-'F'-ST-PG-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'-'C' (30h, 43h): Message length Message STX (02h): Start of Message 'C'-'3'-'3'-'F' (43h, 33h, 33h, 46h): Enable/Disable Schedule writes reply command ST: Error status '0'-'0'(30h, 30h): No error '0'-'1'(30h, 31h): Error PG: Program No. '0'-'0'(30h, 30h): Program No.1 | '1'-'D'(31h, 44h): Program No.30 EN: Enable /Disable '0'-'0'(30h, 30h): Disable '0'-'1'(30h, 31h): Enable ETX (03h): End of Message (72/145)