"jack" <> wrote in message news:b15dd4f8-2611-4e3f-9ace-ad21c5f78...@f20g2000vbl.googlegroups.com... > RGB: > > 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. > > jack
Jack, Dave Hart is obviously the man who knows most about this, but my understanding is that the DCD transition should create a hardware interrupt, which then creates a software interrupt, which serialpp.sys handles and notes the time of the transition, which the DLL/ntpd.exe can later retrieve. Even without the special serialpps.sys and DLL, ntpd.exe can note the time of the transition, only just not as accurately. We're talking microsecond-level differences here. I suspect that you may find an option to enable or disable DCD. You seem to have other COM-port issues from your next post. Cheers, David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
