On Tue, Nov 16, 2010 at 10:28 AM, Grant Edwards <grant.b.edwards@xxxxxxxxx> wrote: > On 2010-11-16, Matt Schulte <matts@xxxxxxxxxxxxxxxxxxxx> wrote: >> On Tue, Nov 16, 2010 at 8:30 AM, Pavel Machek <pavel@xxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
