[ntp:questions] Fwd: Re: NetBSD GPS/PPS using 4.2.6p3
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
> 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
> started. I filed a bug report about this:
> 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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