[PATCH] Documentation about RS485 serial communications

[Alan Cox]

On Tue, 16 Nov 2010 10:13:22 -0600
Matt Schulte <matts at commtech-fastcom.com> wrote:

> On Tue, Nov 16, 2010 at 8:30 AM, Pavel Machek <pavel at 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.
>  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