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From: Matt Schulte <matts@commtech-fastcom.com>
To: Grant Edwards <grant.b.edwards@gmail.com>
Cc: linux-serial@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Documentation about RS485 serial communications
Date: Tue, 16 Nov 2010 12:41:14 -0600	[thread overview]
Message-ID: <AANLkTimio1aBh5w616eSikW+dujV-G8_pu-AT=B5e-7Y@mail.gmail.com> (raw)
In-Reply-To: <ibubf5$ev$1@dough.gmane.org>

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

  parent reply	other threads:[~2010-11-16 18:41 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-29  7:16 [PATCH] atmel_serial: Atmel RS485 support v2 Claudio Scordino
2010-03-29 19:44 ` Ryan Mallon
2010-03-30  9:07   ` Claudio Scordino
2010-03-30 19:37     ` Ryan Mallon
2010-04-08  7:58       ` Claudio Scordino
2010-04-08  9:01         ` Russell King - ARM Linux
2010-04-08 10:13         ` Alan Cox
2010-04-08 13:16           ` Claudio Scordino
2010-04-08 13:42             ` Alan Cox
2010-05-26 13:18             ` Nicolas Ferre
2010-05-27  8:37               ` Claudio Scordino
2010-05-27  9:57                 ` Nicolas Ferre
2010-05-27 10:29                   ` Wolfram Sang
2010-05-28 15:05                     ` Claudio Scordino
2010-08-11  9:26                     ` [PATCH] Documentation about RS485 serial communications Claudio Scordino
2010-08-11 10:02                       ` Philippe De Muyter
2010-08-11 15:32                       ` Randy Dunlap
2010-08-11 19:58                         ` Claudio Scordino
2010-08-14 12:50                         ` Claudio Scordino
2010-08-15 22:02                           ` Randy Dunlap
2010-08-15 22:19                             ` Russell King - ARM Linux
2010-10-19 12:28                               ` Claudio Scordino
2010-10-19 14:29                                 ` Grant Edwards
2010-10-19 15:27                                   ` Alexander Stein
     [not found]                                     ` <i9kk4o$svc$1@dough.gmane.org>
2010-10-20  8:00                                       ` Alexander Stein
2010-10-20 18:56                                         ` Alan Cox
2010-10-24 11:29                                       ` Claudio Scordino
2010-11-10  9:17                                         ` Nicolas Ferre
2010-11-10 17:28                                           ` Greg KH
2010-11-11 10:22                                             ` Claudio Scordino
2010-11-16 14:30                                               ` Pavel Machek
2010-11-16 15:28                                                 ` Alexander Stein
2010-11-16 16:13                                                 ` Matt Schulte
2010-11-16 17:20                                                   ` Alan Cox
2010-11-16 18:03                                                     ` Grant Edwards
2010-11-16 20:04                                                       ` Alan Cox
2010-11-30 19:19                                                         ` Pavel Machek
     [not found]                                                   ` <ibubf5$ev$1@dough.gmane.org>
2010-11-16 18:41                                                     ` Matt Schulte [this message]
2010-05-28  9:42                   ` [PATCH] atmel_serial: Atmel RS485 support v2 Haavard Skinnemoen
2010-05-28 13:54                     ` [PATCH] MAINTAINERS: some Atmel drivers change maintainer Nicolas Ferre
2010-05-28 13:31                       ` Haavard Skinnemoen
2010-06-11  7:23                       ` Nicolas Ferre
2010-08-11 20:20 [PATCH] Documentation about RS485 serial communications Randy Dunlap

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