Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754743Ab0KPQUA (ORCPT ); Tue, 16 Nov 2010 11:20:00 -0500 Received: from mail-vw0-f46.google.com ([209.85.212.46]:37170 "EHLO mail-vw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754441Ab0KPQT6 (ORCPT ); Tue, 16 Nov 2010 11:19:58 -0500 MIME-Version: 1.0 In-Reply-To: <20101116143016.GB6527@ucw.cz> References: <20100408111310.524f7354@lxorguk.ukuu.org.uk> <4CBD8EE4.5040808@evidence.eu.com> <201010191727.53314.alexander.stein@systec-electronic.com> <4CC418A9.6090602@evidence.eu.com> <4CDA630F.4060903@atmel.com> <20101110172842.GC12371@suse.de> <4CDBC3EC.6020707@evidence.eu.com> <20101116143016.GB6527@ucw.cz> From: Matt Schulte Date: Tue, 16 Nov 2010 10:13:22 -0600 Message-ID: Subject: Re: [PATCH] Documentation about RS485 serial communications To: Pavel Machek Cc: Claudio Scordino , Greg KH , Nicolas Ferre , linux-serial@vger.kernel.org, Grant Edwards , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alan Cox Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 909 Lines: 22 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. It seems that most of the time people would rather have a faster serial port than one that does several different voltages. Matt Schulte -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/