"David Lord" <> wrote in message news:[email protected]... > David J Taylor wrote: [] >> If the Garmin can deliver +/-5V, it should certainly drive almost any >> reasonable RS-232 port. It sounds as if your USB converter has a lower > > I doubt now that I tried with the Garmin on the server (possibly > tried on eeepc but not yet sorted the data). I'd had <16...@50% > from MSF/SHM/PPS via serial, then just after that noted failure > to get useful result via usb-serial, no better than 10ms. I don't > have figures handy for MSF without PPS via serial. Outputs for > MSF/DCF77 are current sinks to 0V, Conrad pulldown for MSF and a > BC337 on my PPS module. > > David
It seems odd that the GPS18x has "near RS-232" levels on the TX data, but not the PPS/DCD line. Perhaps it's just that line which needs a boost? I've driven a few mA into an LED direct from the PPS line, so perhaps it's more pulled up to +5V (current limited) than a current pull-down to 0V (which should be towards -5V/-12V in any case). Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
