From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Chris Fowler <cfowler@outpostsentinel.com>,
Robert White <rwhite@casabyte.com>, Ed Vance <EdV@macrolink.com>,
"'Linux PPP'" <linuxppp@indiainfo.com>,
linux-serial@vger.kernel.org,
"'linux-kernel'" <linux-kernel@vger.kernel.org>
Subject: RE: RS485 communication
Date: 16 Mar 2003 00:56:01 +0000 [thread overview]
Message-ID: <1047776160.1327.0.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <1047732394.20703.10.camel@imladris.demon.co.uk>
On Sat, 2003-03-15 at 12:46, David Woodhouse wrote:
> On Thu, 2003-03-13 at 23:30, Chris Fowler wrote:
> > Are you saying that for him to to use PPPD that he will have to write a
> > program that will run on a master and tell all the slave nodes when they
> > can transmit their data. In this case it would be ppp data. Hopfully
> > in block sizes that are at least the size of the MTU ppp is running.
>
> You don't _need_ a master, although it's often an easy answer.
>
> You can have a token-bus arrangement like ARCnet does. In fact, the
> ARCnet data sheets describing how it works may make interesting reading.
RS485 supports CDMA, thats more than enough to implement ppp nicely, all
you have to do is a little abuse in the app or driver layer to block
sending when carrier is asserted
next prev parent reply other threads:[~2003-03-15 23:37 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 [this message]
2003-03-16 10:05 ` David Woodhouse
2003-03-16 10:35 ` Russell King
2003-03-16 10:51 ` David Woodhouse
2003-03-15 19:46 ` RS485 communicatio Pavel Machek
2003-03-16 19:57 ` Alan Cox
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
[not found] <20030324143723.11625.qmail@indiainfo.com>
2003-03-24 16:41 ` Joachim Franek
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