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

[Mark C. Stephens]

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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