[ntp:questions] help with setting up NTP on windows with a USB GPS

Dave Hart davehart at gmail.com
Mon Nov 30 16:08:56 UTC 2009


On Nov 30, 3:25 pm, jack <j.jack.w... at gmail.com> wrote:
> I tried the serial port on my B&B serial board and the 1PPS signal is
> not detected. I don't how how serialpps.sys sees the signal and am
> thinking the DCD signal is not sent over the PCI bus.

serialpps.sys is a very lightly modified serial.sys.  DCD transitions
trigger an interrupt and the driver looks at the "modem status
register" bits from the UART to determine whether DCD is asserted or
not.

I doubt there's a custom driver involved, so serialpps.sys hijacking
serial.sys's role should be handling it.  I suppose it's possible the
card doesn't wire the DCD pin through to the UART but I hope that's
unlikely.

Cheers,
Dave Hart




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