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

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Message-ID: <20101116172013.102e06a6@lxorguk.ukuu.org.uk>
Date:	Tue, 16 Nov 2010 17:20:13 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matt Schulte <matts@...mtech-fastcom.com>
Cc:	Pavel Machek <pavel@....cz>,
	Claudio Scordino <claudio@...dence.eu.com>,
	Greg KH <gregkh@...e.de>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-serial@...r.kernel.org,
	Grant Edwards <grant.b.edwards@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation about RS485 serial communications

On Tue, 16 Nov 2010 10:13:22 -0600
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.
>  It seems that most of the time people would rather have a faster
> serial port than one that does several different voltages

If there are two types in common use then thats enough to say we should
have a common interface IMHO
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