[ntp:questions] Fwd: Re: NetBSD GPS/PPS using 4.2.6p3

A C agcarver+ntp at acarver.net
Fri Aug 26 07:36:58 UTC 2011

On 8/25/2011 23:30, David J Taylor wrote:
> "A C" <agcarver+ntp at acarver.net> wrote in message
> news:4E56AF25.8080800 at acarver.net...
> []
>> I am willing to try anything so I gave it a shot but it didn't work. I
>> still get a "kern PPS no signal" message if NMEA and PPS are both
>> enabled. Using PPS alone with /dev/pps1 pointing to /dev/dtyb works
>> fine. So there's still some type of contention going on.
>> I'll still have to put a serial monitor on the line and try to figure
>> out what is being transmitted towards the GPS when the PPS driver is
>> active.
> I noticed that when updating from ntpd 4.2.7p97 to ntpd 4.2.7p206, I
> noticed that the newer
> version is sending some RS-232 data to the GPS soon after the PPS signal
> has
> started. I filed a bug report about this:
> http://bugs.ntp.org/show_bug.cgi?id=1999
> I don't know whether it's related to your issue, though, as I'm seeing
> this on Windows.

I'll have to go back and see if I can count the bytes but first glance 
seems to show at least 64 bytes.  I'm half tempted to say it's actually 
a packet of some type (TCP or UDP with a data payload?) being spat out 
the serial port.  I say this because the front part of the data is 
almost always the same and only the last portion seems to change a 
little at a time (like a counter).

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