Hi everybody!
I am a newbie and am wondering what options there are for exchanging time
on a more basic level than NTP or PTP (that is for situations when a
full network stack is too complex).
For now I have found:
NMEA (probably ZDA only)
IRIG timecode (this is rather complex, I would rather have a
full network stack than IRIG?)
SMPTE timecode (this too?)
Are there any other obvious candidates I missed? How did e.g.
HP atomic clocks tell their time to connected devices before
there was the NTP protocol? Did they output NMEA or something
else? Did they emit IRIG directly?
I want to create an Arduino based clock that tells time to a computer
it is linked too. For exact seconds alignment I want to use a PPS signal,
but I need a means to tell the computer about second numbers, hours etc.
too.
Of course I could invent a serial protocol, but I suppose if I invented a
text based serial protocol, it would probably end up looking very
similar in structure to NMEA ZDA sentences.
*Is* NMEA the most practical time protocol at the 1 second level
(that is when a PPS pulse takes care of second alignment?) or should
I use something else if I am free to design stuff clean slate?
TIA
/ralph
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