Re: [PATCH] Documentation about RS485 serial communications

[Grant Edwards <grant.b.edwards@gmail.com>]

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?

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