[time-nuts] NTP/1-PPS/RS232 question
David J Taylor
david-taylor at blueyonder.co.uk
Mon Aug 19 08:29:54 UTC 2013
From: Hal Murray
> Yes, this is right. But watch the polarity. It is easy to get it wrong.
> In RS-232 the controls pins are different from the data pins.
The reference implementation of ntpd can accept either polarity.
It's one of the fudge options.
=====================
Although, IIRC from discussions with Dave Hart, the Windows port can only
accept the normal positive-going signal on the DCD line. The devices I've
tested all have positive going signals. Pulse width is typically 100 or 200
milliseconds, with a few receivers giving a much shorter pulse.
Cheers,
David
--
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Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
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