On Tue, 30 Dec 2008 17:14:52 GMT, Unruh <[email protected]> wrote:
>"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. What you are proposing is contrary to almost everything I've read about hooking up this unit. -- George, Ginger/The Beast Kasica(8/1/88-3/19/01, 1/17/02- ), Rosie(9/1/07- ), Merlin/MR. Tibbs(8/1/90-5/24/06, 2/10/08- ), Nazarene(6/1/99-1/28/08) Jackson, WI USA [email protected] http://www.netwrx1.com/georgek ICQ #12862186 ("`-''-/").___..--''"`-._ `6_ 6 ) `-. ( ).`-.__.`) (_Y_.)' ._ ) `._ `. ``-..-' _..`--'_..-_/ /--'_.' ,' (il),-'' (li),' ((!.-' _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
