Difference between revisions of "Protocol decoder:Dcf77"

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| id              = dcf77
| id              = dcf77
| name            = DCF77 time protocol
| name            = DCF77 time protocol
| description    = European longwave time signal (77.5kHz carrier signal)
| description    = European longwave time signal (77.5&nbsp;kHz carrier signal)
| status          = supported
| status          = supported
| license        = GPLv2+
| license        = GPLv2+
Line 11: Line 11:
| probes          = DATA
| probes          = DATA
| optional_probes = &mdash;
| optional_probes = &mdash;
| options        = &mdash;
}}
}}


The '''dcf77''' protocol decoder supports the [http://en.wikipedia.org/wiki/DCF77 DCF77] european longwave time signal (77.5kHz carrier signal).
The '''dcf77''' protocol decoder supports the [http://en.wikipedia.org/wiki/DCF77 DCF77] European longwave time signal (77.5&nbsp;kHz carrier signal).


== Hardware ==
== Hardware ==
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=== DCF77 on the Pollin DCF1 module ===
=== DCF77 on the Pollin DCF1 module ===


The [http://sigrok.org/gitweb/?p=sigrok-dumps.git;a=tree;f=dcf77/pollin_dcf1_module dcf77/pollin_dcf1_module] directory in sigrok-dumps contains a set of example captures of a DCF77 signal. The hardware used for receiving the signal is a [http://www.pollin.de/shop/dt/NTQ5OTgxOTk-/Bausaetze_Module/Module/DCF_Empfangsmodul_DCF1.html Pollin DCF1] module (3.3V supply). The Pollin order number for the module is 810 054.
The [http://sigrok.org/gitweb/?p=sigrok-dumps.git;a=tree;f=dcf77/pollin_dcf1_module dcf77/pollin_dcf1_module] directory in sigrok-dumps contains a set of example captures of a DCF77 signal. The hardware used for receiving the signal is a [http://www.pollin.de/shop/dt/NTQ5OTgxOTk-/Bausaetze_Module/Module/DCF_Empfangsmodul_DCF1.html Pollin DCF1] module (3.3&nbsp;V supply). The Pollin order number for the module is 810 054.


The dumps were made January 9, 2012 in the evening/night. Only the dcf77_480s_pon_interrupted.sr dump was made January 10, 2012 in the evening.
The dumps were made January 9, 2012 in the evening/night. Only the dcf77_480s_pon_interrupted.sr dump was made January 10, 2012 in the evening.


The logic analyzer used was a [[Saleae Logic]] (at 1MHz).
The logic analyzer used was a [[Saleae Logic]] (at 1&nbsp;MHz).


'''Probe setup:'''
'''Probe setup:'''

Latest revision as of 17:35, 25 April 2015

dcf77
Pollin dcf1 dcf77 module device top.jpg
Name DCF77 time protocol
Description European longwave time signal (77.5 kHz carrier signal)
Status supported
License GPLv2+
Source code decoders/dcf77
Input logic
Output dcf77
Probes DATA
Optional probes —
Options —

The dcf77 protocol decoder supports the DCF77 European longwave time signal (77.5 kHz carrier signal).

Hardware

DCF77 on the Pollin DCF1 module

The dcf77/pollin_dcf1_module directory in sigrok-dumps contains a set of example captures of a DCF77 signal. The hardware used for receiving the signal is a Pollin DCF1 module (3.3 V supply). The Pollin order number for the module is 810 054.

The dumps were made January 9, 2012 in the evening/night. Only the dcf77_480s_pon_interrupted.sr dump was made January 10, 2012 in the evening.

The logic analyzer used was a Saleae Logic (at 1 MHz).

Probe setup:

Probe DCF1 module
1 (black) PON
2 (brown) DATA

Photos:

  • Pollin dcf1 dcf77 module device top.jpg
  • Pollin dcf1 dcf77 module device bottom.jpg
  • Pollin dcf1 dcf77 module probe setup.jpg
  • Pollin dcf1 dcf77 module probing1.jpg
  • Pollin dcf1 dcf77 module probing2.jpg
  • Pollin dcf1 dcf77 module probing3.jpg

Protocol

Time code interpretation (taken from Wikipedia)

The time is represented in binary-coded decimal (BCD). It represents civil time, including summer time adjustments. The time transmitted is the time of the following minute; e.g. during December 31 23:59, the transmitted time encodes January 1 00:00.

Bit Weight Meaning Bit Weight Meaning Bit Weight Meaning
PM AM PM AM PM AM
:00 1 M Start of minute. Always 0. :20 S Start of encoded time. Always 1. :40 10 Day of month (continued)
:01 1 Civil warning bits, provided by the
Bundesamt für Bevölkerungsschutz
und Katastrophenwarnung (Federal Office
of Civil protection and Disaster Relief).
Also contains weather broadcasts. 		:21 1 Minutes
00–59 		:41 20
:02 1 :22 2 :42 1 Day of week
Monday=1, Sunday=7
:03 1 :23 4 :43 2
:04 1 :24 8 :44 4
:05 1 :25 10 :45 1 Month number
01–12
:06 1 :26 20 :46 2
:07 1 :27 40 :47 4
:08 1 :28 P1 Even parity over minute bits 21–28. :48 8
:09 1 :29 1 Hours
0–23 		:49 10
:10 0 :30 2 :50 1 Year within century
00–99
:11 0 :31 4 :51 2
:12 0 :32 8 :52 4
:13 0 :33 10 :53 8
:14 0 :34 20 :54 10
:15 R Call bit: abnormal transmitter operation.
Previously: backup antenna in use. 		:35 P2 Even parity over hour bits 29–35. :55 20
:16 A1 Summer time announcement.
Set during hour before change. 		:36 1 Day of month.
01–31 		:56 40
:17 Z1 Set to 1 when CEST is in effect. :37 2 :57 80
:18 Z2 Set to 1 when CET is in effect. :38 4 :58 P3 Even parity over date bits 36–58.
:19 A2 Leap second announcement.
Set during hour before leap second. 		:39 8 :59 0 Minute mark: no amplitude modulation.

Resources

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