Hi A direct port might be a +/- 100 ns sort of thing most of the time and a +/-10 us thing every so often under some OS’s. Most desktop operating systems are not designed to prioritize random pin interrupts. A dirt cheap MCU coded with a few (hundred) lines of assembly code may be a better option than a typical desktop. Complicating this further is the degree to which some OS’s can be directly or indirectly optimized. Install *this* package and it all goes nuts. Install that package and not much happens ….
Bob > On Feb 13, 2017, at 11:07 AM, Ruslan Nabioullin <rnabioul...@gmail.com> wrote: > > Hi, generally speaking, what are the performance differences between the > following: 1. direct RS-232 (i.e., what I believe is a standard PCI card > offering RS-232---essentially UARTs interfaced more-or-less directly to the > PCI bus); 2. RS-232 via USB; 3. PPS decoding PCI cards (which might also have > an IRIG input or even an onboard GNSS receiver). > > Thanks in advance, > Ruslan > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
