[time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards
albertson.chris at gmail.com
Tue Feb 14 12:33:44 EST 2017
Here is a something that could work. It has a real serial port and you
could add more ethernet controllers, uses very little power and cost only
There are other boards like this that use the same J1900 CPU. I'm
thinking about using this as th machine tool (milling machine) controller.
On Tue, Feb 14, 2017 at 4:26 AM, Bob Camp <kb8tq at n1k.org> wrote:
> 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
> 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
> Complicating this further is the degree to which some OS’s can be directly
> indirectly optimized. Install *this* package and it all goes nuts. Install
> that package
> and not much happens ….
> > On Feb 13, 2017, at 11:07 AM, Ruslan Nabioullin <rnabioullin at gmail.com>
> > 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
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Redondo Beach, California
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