Doesn't specially need to be CAB bus, but use CAN transceivers as transceiv=
ers on an RS485 bus. Simplifies the TX/RX switching (you don't need to) and=
 the receiver is 'always on' then you need to compare the received message =
with the transmitted message to detect a collision.


> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Denny Esterline
> Sent: 22 October 2017 19:17
> To: Microcontroller discussion list - Public. <piclist@mit.edu>
> Subject: Re: [EE} Collision detection
>=20
> Look into CAN bus.
> Even if you just consider mis-using the CAN transceivers and physical lay=
er,
> there's some really interesting possibilities.
>=20
> On Sunday, October 22, 2017, David C Brown <dcb.home@gmail.com> wrote:
>=20
> > I am playing about with some home automation.   I am looking towards a
> > multimaster bus using a balanced transmitter and receiver such as RS485=
..
> >
> > Now I well understand how to handle the collision detection in
> > software: I have done that in the past.  But in the past I used open
> > collector TTL on a single ended bus.
> >
> > That is not adequate in the present application because I am looking
> > at distances up to 25 metres.(at a maybe 10KB)
> >
> > So the question is:  what chips can drive the balanced line yet
> > survive contention without cooking
> >
> >
> >
> > __________________________________________
> > David C Brown
> > 43 Bings Road
> > Whaley Bridge
> > High Peak                           Phone: 01663 733236
> > Derbyshire                eMail: dcb.home@gmail.com <javascript:;>
> > SK23 7ND          web: www.bings-knowle.co.uk/dcb
> > <http://www.jb.man.ac.uk/~dcb>
> >
> >
> >
> > *Sent from my etch-a-sketch*
> > --
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> >
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--=20
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