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    SubjectRe: [PATCH] Documentation about RS485 serial communications
    On Tue, Nov 16, 2010 at 10:28 AM, Grant Edwards
    <grant.b.edwards@gmail.com> wrote:
    > On 2010-11-16, Matt Schulte <matts@commtech-fastcom.com> wrote:
    >> On Tue, Nov 16, 2010 at 8:30 AM, Pavel Machek <pavel@ucw.cz> wrote:
    >>> Hi!
    >>>
    >>>> Documentation about RS485 serial communications
    >>>
    >>> I have seen hardware (kontron pmc-6l) that was capable of switching
    >>> between RS232, RS485 and one other standard by software.
    >>>
    >>> Is such hw common? If so, should we have standard interface?
    >>
    >> In my opinion this type of card is not that common.  Generally
    >> speaking the achievable baud rates for this type of multi-protocol
    >> card are very limited because of limitations of the transceiver chips.
    >
    > I'm curious which selectable interface cards you're talking about that
    > are slow?  The ones I'm familiar with generally support baud rates up
    > to either 460K bps or 921K bps
    >
    >> It seems that most of the time people would rather have a faster
    >> serial port than one that does several different voltages.
    >
    > Where did you find a selectable interface serial card that couldn't
    > support high baud rates?

    In my world 460kbps for an RS422 card is slow. RS422 cards generally
    push multi megabit/s rates.

    Matt Schulte
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