thanks David

Yes it works fine with the SerialPortLEDs. The DCD blinks in that software.
In my GPS engine the PPS length is 100msec.

The problem is that when I start the NTP, I only can see the NMEA driver 
working. No PPS is recognized by the NTP.

As I mentioned above I have already installed SerialPPS, 
serialpps-ppsapi-provider.dll, ...

1- Is 100ms enough to trig the NTPd?
2- Any precautions in using win_server_2008/64?
3- Shall the PPS be seen in ntp status (ntp-q) even when no PPS is connected to 
DCD pin? ("only server 127.127.22.1" is written in ntp.conf and SerialPPS is 
installed)

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