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SubjectRe: [PATCH] Documentation about RS485 serial communications
On Tue, Nov 16, 2010 at 10:28 AM, Grant Edwards
<> wrote:
> On 2010-11-16, Matt Schulte <> wrote:
>> On Tue, Nov 16, 2010 at 8:30 AM, Pavel Machek <> 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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