NEC UN552S External Controls - Page 79

12. Weekend read and write 12.1 Weekend Read This command is used in order to read the setting of Weekend. 1) The controller requests the monitor to reply with the Date & Time. Header Message Check code SOH-'0'-Monitor ID- STX-'C'-'A'-'1'-'A'-'0'-'0'-ETX BCC '0'-'A'-'0'-'8' 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'-'8'(30h, 38h): Message length Message STX (02h): Start of Message 'C'-'A'-'1'-'A' (43h, 41h, 31h, 41h): '0'-'0' (30h, 30h): read request ETX (03h): End of Message Weekend 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'-'0'-'C' Message STX-'C'-'B'-'1'-'A'-'0'-'0'-ST- WEEK-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" '0'-'C'(30h, 43h): Message length Message STX (02h): Start of Message 'C'-'B'-'1'-'A' (43h, 42h, 31h, 41h): Weekend reply '0'-'0' (30h, 30h): read request ST: Status '0'-'0'(30h, 30h): No error '0'-'1'(30h, 31h): Error WEEK: Weekend '0'-'0'(30h, 30h): None bit assignment of a day of the week. bit0: Monday bit1: Tuesday bit2: Wednesday bit3: Thursday bit4: Friday bit5: Saturday bit6: Sunday command (79/145)