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

Steve Kostecke kostecke at ntp.org
Fri Aug 26 12:20:54 UTC 2011

On 2011-08-26, David J Taylor <david-taylor at blueyonder.co.uk> wrote:

> "A C" <agcarver+ntp at acarver.net> wrote:
>> 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

http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html states:

"The driver will send a $PMOTG,RMC,000*1D<cr><lf> comand each poll
interval. This is not needed on most GPS receivers because they
automatically send $GPRMC every second, but helps a Motorola GPS
receiver that is otherwise silent. NMEA devices ignore commands they do
not understand."

Searching for "PMOTG", using the doc.ntp.org search facility, reveals that
the same text is present on:


So this is not a new addition to ntp-dev.

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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