"David J Taylor" <[email protected]> writes:
>Richard B. Gilbert wrote: >[] >> I think your best help/advice will come from another GPS18LVC user. >I described my own simple setup here: > http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm >but it's not Linux, and I don't feel competent enough to give "advice". >It seems likely that the wrong edge is being detected, so why not try >reversing the polarity? I only use the: 127.127.20.1 reference clock, >with GPS configured in the kernel. The other problem is that the the voltage levels might be wrong. A serial port is supposed to be -12V to 12V, not the 0-5V that the PPS line on the garmin delivers. Now some serial ports are OK with the 0-5V but that is pretty unusual. YOu either need a voltage converter, or you need to use the parallel port instead, which takes 0-5V. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
