[ntp:questions] Assistance with PPS on Windows

Ken Link klink at numberzero.org
Wed May 4 19:11:16 UTC 2011

Cool program. We've got a physical adapter that does the same thing.
We're using DB9-to-RJ45 adapters throughout our serial network and it
appears I'm not using the correct RJ45-to-DB9 adapter to move the PPS
signal to the DCD pin. I'll post back when I make the right adapter
and get a chance to test again.

That would probably explain why ntpd is seeing a 413279.091756s offset, huh.


On Wed, May 4, 2011 at 9:56 AM, David J Taylor
<david-taylor at blueyonder.co.uk.invalid> wrote:
> []
>> The problem is we cannot get NTP to sync to the PPS output. The PPS
>> source shows up in “ntpq –p” however it has 0 reach. System B is
>> synced to System A and is a stable Stratum 2 server at the moment.
>> MbgMon on System B shows the PPS output on the card is active. The
>> IRIG signal is 100% and shows it is synced. I’ve installed the
>> serialpps driver, rebooted and verified it was loaded in the Device
>> Manager, set the PPSAPI_DLLS global environment variable
>> appropriately, etc.
>> Any suggestions on how to troubleshoot this?
>> Thanks,
>> Ken
> Ken, Dave Hart is the expert in the PPS on Windows.  Could I suggest that
> you at least check that the pulses are being seen by checking with my Serial
> Port LEDs program?
>  http://www.satsignal.eu/software/net.htm#SerialPortLEDs
> With NTP not running (as only one device can access the COM port), see
> whether there are brief white flashes on the DCD line.
> Cheers,
> David
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