Re: Practical setup of the CAN physical layer in automobiles

SC> I am currently working with a vehicle prototype where all CAN
SC> lines are connected in a star point.  I cannot imagine that this
SC> is the way it would be done in a mass production vehicle.

In fact that's the way it is done.
Some have two stars - one in front other at the back.
As many as 8 pairs in one place.

Some have mixed connections.
Nodes are conected in series - two pairs into one socket, but on
some nodes there is more than just two. Junction is made in a plug.

I'm talking about cars like those from top from Germany.
They have a lot of nodes, but not only on one CAN BUS.

"Regular" cars have much less modules.

Tom


W liście z 11 kwietnia 2013:
From: [email protected]
To: [email protected]
CC: 

SC> Hello,

SC> Literature on the CAN bus usually only explains how the CAN bus
SC> should work in theory, but I am wondering how the physical layer
SC> of the CAN busses in automobiles is actually implemented in real cars.

SC> I am currently working with a vehicle prototype where all CAN
SC> lines are connected in a star point.  I cannot imagine that this
SC> is the way it would be done in a mass production vehicle.

SC> On the other hand, a line structure would require some kind of
SC> T-junction connectors. Another possibility would be to place the
SC> junction inside of the control units, but that would require two
SC> pairs of CAN lines to be fed into the control units.
SC> I have never seen neither this nor that in automotive wiring harnesses.

SC> Can someone with practical experience tell me, how the CAN wiring
SC> in series cars is actually set up?

SC> Thank you in advance,
SC> Christian

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