[time-nuts] NTP/1-PPS/RS232 question

[Hal Murray]

holrum at hotmail.com said:
> The 1PPS signal is normally low and pulses high for 100 milliseconds.  The
> RS-232 adapter board that I built feeds this into an RS-232 transmitter chip
> (MAX3232),  so on the interface connector CD will be at +V and pulse down to
> -V.  Is this what stock NTP likes? 

There is a fudge option to select either rising or falling edge.  The default 
is rising edge, so you will need to turn on flag2.  Check the page for the 
driver you are going to use.



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