Delimiter

CR (0Dh): End of packet

2) The monitor replies a data for confirmation.

Header

Message

Check code

Delimiter

SOH-'0'-'0'-Monitor ID-'B'-'1'-'6'

STX-'C'-'3'-'1'-'2'-ST-YY-MM-DD-WW-HH-MN

BCC

CR

-DS-ETX

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'-'6'(31h, 36h): Message length

Message

STX (02h): Start of Message

'C'-'3'-'1'-'2' (43h, 33h, 31h, 32h): Date & Time write reply command

ST: Date & Time Status command '0'-'0'(30h, 30h): No error '0'-'1'(30h, 31h): Error

'YY'-'MM'-'DD'-'WW'-'HH'-'MN'-'DS': Date & Time data YY: Year (offset 2000)

'0'-'0'(30h, 30h): 2000

'6'-'3'(36h, 33h): 2099 (99 = 63h)

MM: Month

'0'-'1'(30h, 31h): January

'0'-'C'(30h, 43h): December

DD: Day

'0'-'1'(30h, 31h): 1

'1'-'E'(31h, 45h): 30(=1Eh)

'1'-'F'(31h, 46h): 31(=1Fh)

WW: weekdays

'0'-'0'(30h, 30h): Sunday

'0'-'1'(30h, 31h): Monday

'0'-'2'(30h, 32h): Tuesday

'0'-'3'(30h, 33h): Wednesday

'0'-'4'(30h, 34h): Thursday

'0'-'5'(30h, 35h): Friday

'0'-'6'(30h, 36h): Saturday

HH: Hours '0'-'0'(30h, 30h): 0

'1'-'7'(31h, 37h): 23 (=17h)

MN: Minutes '0'-'0'(30h, 30h): 0

'3'-'B' (33h, 42h): 59 (=3Bh)

DS: Daylight saving (Summer time) '0'-'0'(30h, 30h): NO '0'-'1'(30h, 31h): YES

ETX (03h): End of Message

Check code

BCC: Block Check Code

Refer to the section 4.5 “Check code” for a BCC calculation.

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NEC RS-232C manual Check code Delimiter