[time-nuts] Generate 1 PPS signal on serial port

Eugen eugen at lavabit.com
Tue Aug 6 15:49:30 UTC 2013


On Tue, 6 Aug 2013 13:07:28 +0000
"Mark C. Stephens" <marks at non-stop.com.au> wrote:

> I am not really sure what you are trying to do either..
> 
> If you are trying to tee the output of a GPS, make a Y cable and
> connect TxD from GPS and DCD to each end (as PPS and NMEA are
> broadcast or one way if you like) once the receiver has been
> configured. You will have timenuts having strokes if you try and do
> it in software!
> 
> However if you are hell bent on generating PPS in software somehow
> (please let me know you plan? - curious) Use
> http://www.curioustech.net/xport.html Been around for years and its
> pretty good and free to boot.
> 
> Or am I still looking at your problem from the wrong end?
> 
> Personally, I am moving my NTP server to the parallel port shortly.
> 
> 
> --marki
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> On Behalf Of Eugen Sent: Tuesday, 6 August 2013 10:32 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Generate 1 PPS signal on serial port
> 
> > Marki the "smart" search engine came back with:
> > 
> > Prof David Mills: http://www.eecis.udel.edu/~mills/ntp/html/pps.html
> > Pulse-Per-Second (PPS) Signal Interfacing Hardware:
> > http://www.vk2hmc.net/blog/?p=583
> > 
> > If using Linux you need kernel version > 2.6.39.4 or version 3
> > kernel as the PPS interface is now included in the kernel. Unless
> > of course, low latency and jitter is not an issue for you ;) You
> > can use either parallel or serial PPS.
> > 
> > For windows see http://www.davehart.net/ for binaries.
> > David Taylor pretty much covers it here:
> > http://www.satsignal.eu/ntp/NTP-on-Windows-Vista.html
> 
> Thanks, but I need it the other way: the PC itself should generate the
> 1 PPS signal without an external reference, except the network
> connection to NTP servers. It's more of a software problem.
> 
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No, I don't use a GPS or other synchronization hardware. The PC uses
only network communication with NTP, and the PC itself should output an
1 PPS signal on a port serial / parallel. 

I want to analyze the 1 PPS signal generated by the PC and the
synchronization process or to compare two 1 PPS signals generated by
different computers. 




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