NEC LCD3215 External Control Guide - Page 23

10.Schedule read and write 10.1 Schedule Read This command is used in order to read the setting of the Schedule. 1) The controller requests the monitor to read Schedule Header Message Check code SOH-'0'-'A'-'0'-'A'-'0'-'8' STX-'C'-'2'-'1'-'3'-PG-ETX BCC Delimiter CR Header SOH (01h): Start Of Header '0' (30h): Reserved 'A' (41h): Monitor ID LCD3215/LCD4215 must be ASCII 'A' (41h). '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'-'2'-'1'-'3' (43h, 32h, 31h, 33h): Schedule read request command PG: Program No.  The data must be ASCII characters strings. ETX (03h): End of Message Check code BCC: Block Check Code Refer to the section 4.5 "Check code" for a BCC calculation. Delimiter CR (0Dh): End of packet 2) The monitor replies Schedule to the controller. Header SOH-'0'-'0'-'A'-'B'-'1'-'6' Message STX-'C'-'3'-'1'-'3'-PG-ON HOURS-ON MIN-OFF HOURS-OFF Min-INPUT-WD-FL-ETX Check code BCC Delimiter CR Header SOH (01h): Start of Header '0' (30h): Reserved '0' (30h): Message receiver is the controller 'A' (41h): Monitor ID LCD3215/LCD4215 must be ASCII 'A' (41h). 'B' (42h): Message type is "Command reply" '1'-'6'(31h, 36h): Message length Message STX (02h): Start of Message 'C'-'3'-'1'-'3' (43h, 33h, 31h, 33h): Schedule read reply command PG-ON HOURS-ON MIN-OFF HOURS-OFF MIN-INPUT-WD-FL: Schedule data PG: Program No. '0'-'0'(30h, 30h): Program No.1 | '0'-'6'(30h, 36h): Program No.7 ON_HOUR: Turn on time (hour) '0'-'0'(30h, 30h): 00 | '1'-'7'(31h, 37h): 23 (=17h) '1'-'8'(31h, 38h): ON timer isn't set. ON_MIN: Turn on time (minute) '0'-'0'(30h, 30h): 0 | '3'-'B'(33h, 42h): 59 '3'-'C'(33h, 43h): On timer isn't set. (23/37)