Re: ISO11783

On 17/07/17 13:31, John Dammeyer wrote:
> They are assigned at the factory or during installation by the looks of it since it's based on J1939.
>
> For example, there's usually only one engine in a vehicle.  So it's pretty easy have a default ID for that ECU (Engine Control Unit)
>
> I had  a project a while ago where I had to prevent mechanical operation of subsystems while the J1939 based vehicle was in gear.  If the message contained 0xF005 in the two middle ID bytes it was transmission information.  If data byte 5 was 0x50 the transmission was in park.  If the message ID contained 0xF004 then bytes 3 and 4 contained engine RPM.  I'd know if the engine was running even if it wasn't in park.
>
> For ISO11783 you need to get a hold of the documents and see how they use the ID part.  It will start to make sense.

Hi,
I will get around to getting all those standards when i'm at that point. I've 
just read booklets and things so far.

The tractor has one ISO bus IIRC, so i was wondering what happens if two towed 
machines of the same make and model are connected simultaneously.

Even if the machines are different brands, some nodes might have the same ID, 
unless they get dynamically assigned.

I was wondering how one could do dynamic node ID assignment, and how to ensure 
no two nodes get the same ID.
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