[time-nuts] RS 232

[Mark C. Stephens]

Hi Hal, according to ntp.org the parallel port is also usable for PPS:
http://www.eecis.udel.edu/~mills/ntp/html/pps.html

Also, Take a look at this gentleman's page (Chrome will translate):
http://www.finetune.co.jp/~lyuka/interests/radio/gps/
there is quite a difference between the amount of jitter between the two interfaces!

But, you know at the end of the Day, 
Anything over Ethernet network will slowly take apart the carefully built NTP server you built with its precision time source anyway :)

Looking around, PPS over TTY is better supported and easier to interface.

Where do we draw the line and say, enough is enough?!



-marki



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Hal Murray
Sent: Friday, 26 July 2013 9:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RS 232


john at miles.io said:
> Agreed, nobody should be using RS232 for anything nowadays.

RS232 works much better for capturing PPS timing.


Another advantage of RS232 over USB is that the configuration is stable when things get unplugged and replugged, or powered off, or ...  Of course, that's a disadvantage if your program wants to know when the gizmo got unplugged.

--
These are my opinions.  I hate spam.



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