linux-kernel - Re: [PATCH] Documentation about RS485 serial communications

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Date:	Tue, 16 Nov 2010 12:41:14 -0600
From:	Matt Schulte <matts@...mtech-fastcom.com>
To:	Grant Edwards <grant.b.edwards@...il.com>
Cc:	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation about RS485 serial communications

On Tue, Nov 16, 2010 at 10:28 AM, Grant Edwards
<grant.b.edwards@...il.com> wrote:
> On 2010-11-16, Matt Schulte <matts@...mtech-fastcom.com> wrote:
>> On Tue, Nov 16, 2010 at 8:30 AM, Pavel Machek <pavel@....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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