NEC UN552S External Controls - Page 74

11. Holiday read and write 11.1 Holiday Read This command is used in order to read the setting of Holiday. 1) The controller requests the monitor to reply with the Date & Time. Header Message Check code SOH-'0'-Monitor ID- STX-'C'-'A'-'1'-'9'-'0'-'0'- BCC '0'-'A'-'0'-'A' PG-ETX Delimiter CR Header SOH (01h): Start of Header '0' (30h): Reserved Monitor ID: Specify the Monitor ID of which you want to get status. 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'-'A'-'1'-'9' (43h, 41h, 31h, 39h): '0'-'0' (30h, 30h): read request PG: Program No. '0'-'0'(30h, 30h): Program No.1 | '3'-'1'(33h, 31h): Program No.50 ETX (03h): End of Message Holiday command 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 Date & Time to the controller. Header SOH-'0'-'0'-Monitor ID- 'B'-'1'-'A' Message STX-'C'-'B'-'1'-'9'-'0'-'0'-STPG-TP-YEAR-MONTH-DAY-WEEK NOWEEK-EMON-EDAY-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', the replying Monitor ID is '1'. 'B' (42h): Message type is "Command reply" '1'-'8'(31h, 38h): Message length Message STX (02h): Start of Message 'C'-'B'-'1'-'9' (43h, 42h, 31h, 39h): '0'-'0' (30h, 30h): read request ST: Status '0'-'0'(30h, 30h): No error '0'-'1'(30h, 31h): Error PG: Program No. '0'-'0'(30h, 30h): Program No.1 | '3'-'1'(33h, 31h): Program No.50 Holiday reply command (74/145)