Date: Sat, 22 Oct 2005 16:00:59 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-hackers@freebsd.org, ticso@cicely.de Cc: Frank Behrens <frank@pinky.sax.de> Subject: Re: How disable attachment of sio(4) driver to device? Message-ID: <200510221601.07346.doconnor@gsoft.com.au> In-Reply-To: <20051021203948.GQ31913@cicely12.cicely.de> References: <200510210835.j9L8Zn2P001846@pinky.frank-behrens.de> <20051021203948.GQ31913@cicely12.cicely.de>
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--nextPart19483092.JvN0611cXl Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Sat, 22 Oct 2005 06:09, Bernd Walter wrote: > I personally build specialized USB and Ethernet devices for doing > Modbus/RTU RS485 timing. We use 9 bit data RS485 (the ninth bit is used as an address mark so=20 microcontrollers can sleep until it turns up then check if it's addressed t= o=20 it and go back to sleep). I have been told it could be implemented as a line discipline but I am not = so=20 sure (since to do 9 bit transmition you need to change between mark & space= =20 parity on a byte by byte basis) We (well msmith originally) implemented it as a cut down hacked up copy of = sio=20 =2D this IS suboptimial so I think I'll have a look at implementing it via= =20 uart. =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart19483092.JvN0611cXl Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDWdyr5ZPcIHs/zowRAvZxAJ9AHmxao4hf0cjQl4nNNITSxC2FtgCffJGk N2AnORjfJuXzcnWo45U3WK4= =/pc1 -----END PGP SIGNATURE----- --nextPart19483092.JvN0611cXl--
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