Linux Serial subsystem development
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From: Gerald Emig <gme@emig-software.de>
To: linux-serial@vger.kernel.org
Subject: Re: RS485 communication
Date: Sun, 16 Mar 2003 19:23:31 +0100	[thread overview]
Message-ID: <20030316192331.104a4151.gme@emig-software.de> (raw)
In-Reply-To: <1047811906.22070.44.camel@imladris.demon.co.uk>


Hi all,


RS485 (like RS232-C) is simply an electrical
specification, and nothing else. No protocol at all; surely there are
"proprietary" ones depending on device manufacturers. If I'm
totally wrong please correct me.

There are several protocols that use RS485. Samples are Profibus,
SIEMENS MPI, ISDN, EIB and many others (maybe even CAN), and they are
all different.
Most of these protocols use some master - slave conceptuation, but this
is not allways necessary; best example for the opposite is good old
ethernet.

So if we talk about this stuff and keep in mind the goal of
the initiator of this discussion, fact is that a protocol must be used
when we have more than two devices, either an existing or a new one. 

Problem: which protocol ???
And it seems to me that this is the real point to be discussed: there is
no such protocol (designed for RS485 bus systems) available, right ?



Gerald Emig


  reply	other threads:[~2003-03-16 18:24 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-13 16:56 RS485 communicatio Ed Vance
2003-03-13 17:46 ` Richard B. Johnson
2003-03-13 22:54 ` RS485 communication Robert White
2003-03-13 23:30   ` Chris Fowler
2003-03-15  8:07     ` Robert White
2003-03-15 15:42       ` Chris Fowler
2003-03-15 12:46     ` David Woodhouse
2003-03-16  0:56       ` Alan Cox
2003-03-16 10:05         ` David Woodhouse
2003-03-16 10:35           ` Russell King
2003-03-16 10:51             ` David Woodhouse
2003-03-16 18:23               ` Gerald Emig [this message]
2003-03-15 19:46 ` RS485 communicatio Pavel Machek
2003-03-16 19:57   ` Alan Cox
  -- strict thread matches above, loose matches on Subject: below --
2003-03-17  5:41 RS485 communication Cigol C
2003-03-20 23:09 ` Robert White
2003-03-20 23:17   ` Chris Fowler
2003-03-21  2:48     ` Robert White
2003-03-24 11:43 Cigol C
2003-03-25  3:23 ` Paul Mackerras

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