On 23 October 2017 at 01:30, Harold Hallikainen <harold@mai.hallikainen.org=
>
wrote:

> I think RS485 chips will survive contention without damage.


The smoking ruins on my bench would suggest otherwise :-) :-)

I may well use a token system rather than collision detection since it is
in many ways simpler.  The main downside is that the slave has to wait to
send its data, rather than sending it immediately.  However, with a
relatively low number of slaves and short messages this might not be a real
problem.   Also you can give each slave a priority and offer the token to
the higher priority ones more often in the cycle, even allowing dynamic
priority changes.

Any way up it seems wise to use transceivers that can survive contention
and thee CAN chips look ideal.  Thanks.
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