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Article #1230Re: ELV PC Funkuhr DCF 98 PC software? Source? Protocol?
From: Frank-Christian Kruegel
Date: Wed, 02 Jan 2002 12:36
Date: Wed, 02 Jan 2002 12:36
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On Sun, 30 Dec 2001 09:03:58 GMT, "Werner Van den Eede" <W.VandenEede@Pandora.be> wrote: >Does anybody have more information on the protocol in use by this serial >DCF77 clock? It comes with PCDCFDOS.EXE but no sourcecode ... the >documentation states it uses 9600, even parity, 2 stopbits and 8 databits, >but the connector has 4 wires connected and it does not work with TX, RX and >GROUND only ... after some experimenting I cannot find how it works, how the >PC initiates the communication with the clock, somehow it depends on this >4th wire ... > >I'd like to make it work from within a C(++) module ... Maybe you are better off buying a standard serial DCF77 receiver that connects to RxD and uses control lines (CTS/DTR) for power supply. The DCF signal is fed directly into the UARTs RxD line. With the baud rate set to 50 you can decode ones and zeroes character by character (each character is excatly one bit) and combine them to a complete DCF data set. I'd suggest not using that ELV thing because most of these "intelligent" gadgets don't allow you a _precise_ syncronisation to the radio signal. For the standard serial receivers there is plenty of source code. Just look at the ntp 4 source code, which is the standard time synchronisation software for Unix. Mit freundlichen Gr��en Dipl.-Ing. Frank-Christian Kr�gel IstDa Kommunikationssysteme
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X-Google-Language: ENGLISH,ASCII X-Google-Thread: 112d1e,1334ddaed6735dcb X-Google-Attributes: gid112d1e,public X-Google-Thread: 112e71,1334ddaed6735dcb X-Google-Attributes: gid112e71,public X-Google-Thread: ff242,1334ddaed6735dcb X-Google-Attributes: gidff242,public X-Google-Thread: 115730,1334ddaed6735dcb X-Google-Attributes: gid115730,public X-Google-Thread: 1118be,1334ddaed6735dcb X-Google-Attributes: gid1118be,public X-Google-ArrivalTime: 2002-01-02 08:28:26 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news1.google.com!newsfeed.stanford.edu!headwall.stanford.edu!hub1.nntpserver.com!newsfeed01.sul.t-online.de!t-online.de!newsfeed.hanau.net!uucp.gnuu.de!ultra1.intern.istda.com!newsun.intern.istda.com!not-for-mail From: Frank-Christian Kruegel <fchk@istda.com> Newsgroups: be.science.electronics,de.sci.electronics,sci.electronics.components,sci.electronics.design,sci.electronics.equipment Subject: Re: ELV PC Funkuhr DCF 98 PC software? Source? Protocol? Date: Wed, 02 Jan 2002 13:36:02 +0100 Organization: istda Lines: 30 Message-ID: <3c32fc75.241540977@newsun.intern.istda.com> References: <2MAX7.8134$rt4.1080@afrodite.telenet-ops.be> NNTP-Posting-Host: terabyte.intern.istda.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: newsun.intern.istda.com 1009974962 14257 192.168.235.32 (2 Jan 2002 12:36:02 GMT) X-Complaints-To: usenet@newsun.intern.istda.com NNTP-Posting-Date: 2 Jan 2002 12:36:02 GMT X-Newsreader: Forte Agent 1.8/32.548