Bit Name Description Comment
0-14 Reserved Coding to requirement
15 R Send antenna 0 = Standard antenna / 1 = Reserve antenna
16 A1 Announcement 1 1 = Next hour a Daylight Saving Time (DST) change occurs
17 Z1 Time Zone bit 1 0 = Winter / 1 = Summer (DST)
18 Z2 Time Zone bit 2 0 = Summer / 1 = Winter (usually the opposite of Z1)
19 A2 Announcement 2 1 = Next hour an extra second is inserted (leap-second)
20 S Startbit Always 1, startbit coded time information
21-27 Minutes 7 bit, BCD, LSB first (00...59)
28 P1 Parity bit 1 Even parity for all received bits from the minutes
29-34 Hours 6 bit,BCD, LSB first (00...23)
35 P2 Parity bit 2 Even parity for all received bits from the hours
36-41 Day of the month 6 bit, BCD, LSB first (01...31)
42-44 Day of the week 3 bit, BCD, LSB first (1 = Monday...7 = Sunday)
45-49 Month 5 bit, BCD, LSB first (01...12)
50-57 Year 8 bit, BCD, LSB first (00...99)
58 P3 Parity bit 3 Even parity for all received bits from the date Taken from the PDF file the ONLY info relating to the data output pins:
Serial Output
This port can be used for connecting external units, like. digital displays.
Available information:
Actual year
Actual month
Actual day
Actual day of the week
Actual hour [12h]
Actual AM/PM
Actual minute
Actual second
The transmition always happens on the begining of every hour, at
HH:00.00,500 and takes 44 ms.
Additional transmitions will happen after „first receive“, „forced receive“ und „auto
receive“ and after any correction of the hands was necessary.
Specification Date: 09.03.2005
MSF RC_wallclockDO_Specification
2.7.1. Format of data
Nr. Describtion Format Numbers Explanation
1 daylow BCD 00 - 31 Lower byte of actual day
2 dayhigh BCD 00 - 31 High byte of actual day
3 dayofweek HEX 1 - 7 Day of the week, 1 = monday
4 month HEX 1 - 12 Actual month, 1 = January
5 yearlow HEX 00 - 63 Actual year, 14H = xx20
6 yearhigh HEX 00 - 63 Actual year, 14H = xx20
7 minutelow BCD 0 - 9 Actual minute, 0 - 9
8 minutehigh BCD 0 - 5 Actual minute, 10 -50, 0xxx = AM, 1xxx = PM
9 hour HEX 0 - 11 Actual hour
10 secondlow BCD 0 - 9 Actual second, 0 - 9
11 secondhigh BCD 0 - 5 Actual second, 10 -50
The transmition is serial, sychronized to a clock-frequency of 1 kHz. The clock frequency is
also available on the port.
Timing diagram:
clock pin … 1
data pin ... 2
First nibble Second nibble Third nibble Fourth nibble ...
daylow = 0101B =5 dayhigh = 0010H =2 dayofw. = 0011H =3 month = 1011H =11 ...
Beispiel: 25. Nov. Mittwoch
Example: Nov. 25th WednesdayYou're rightYour MSF receiver appears to also have a built-in decoder like this:
https://www.electro-tech-online.com...83374_MSF20RC_wallclockDO_Specification-1.pdf
So now it looks like it is outputting the time data in a proprietary serial protocol - not the raw MSF time codes that are documented.
Looking at the data sheet, it uses 1khz clock pulses to sync the data bits.
Just as the clock pulse goes from high to low would be a good time to sample the data pin.
A low = 1 and High=0. As it arrives serially so you will need to shift the bits into 4 bit nibbles and in some cases as the values are in hex and others it is in bcd so you may need to convert between hex - bcd depending on what you want to do with the data.
I don't know how you would do it all in Basic as I rarely use it, I prefer asm.
