[time-nuts] Precision Time Protocol – Windows 10 implementation

[David J Taylor]

From: Adam Kumiszcza

It will be connected via a short cable (1,5 m or less) to one computer. The
second will join much later, I will worry about splitting the signal then.
Other computers would be in different rooms, so I would need another time
source.
My question was rather if stacking another board with serial port on it
would be a good idea. I'm thinking of using PPS signal there directly via
GPIO. And maybe NMEA, too.

Cheers,
Adam
=================================

Adam,

You may be unable to stack another board on top, but that depends on the 
boards, of course.  I would suggest using the network connection between the 
computers (with the Internet as a backup) for getting the coarse seconds. 
You then need to know what voltage level is required on the second computer 
for its serial connections - +/- 12 V or TTL levels.  If it's a standard 
serial port on the computer, use a RS232-TTL converter just to connect the 
PPS line to the DCD pin (1 on a DB9 connector).  No need to the TX/RX lines, 
just ground and PPS.

I had hoped that someone else on the group who had real-world experience of 
distributing PPS might chip in....

Cheers,
David
-- 
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
Twitter: @gm8arv