From: Marc Geyskens
Subject: Re: CAN Protocol and SAE J1850, ISO9141 and J1939
Date: Mon, 11 Nov 2002 20:19:38 +0100
References: <3DCDB1A5.34E114E3@bellatlantic.net> <3DCFBAF5.94BFFDC9@xympatico.ca>
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>> Does anybody know which vehicles implement CAN, or how this can be
>> discovered? Also, what is the relationship between ISO9141 and CAN, if
>> any? How about between SAE J1939 and CAN?
>I know that Ford used what they call 'multiplex' in their now out of
>production Scorpio. But that was only for central door locking, power
>windows and power sunroof. It could have been CAN but for this simple
>system, I guess they used something much simpler.
>I think CAN and the like is mainly used in high-end cars where the savings
>by using CAN or something similar are substantial.
Fiat uses CAN in its Punto, wich is not a high end car. They use low
and high speed. If I remember it right; they call it Venice and
Florence. Maybe the new models do too. Mercedes, Porsche, BMW use
CAN. Probably the rest of the car industrie will follow because of the
need for highspeed communications between control units and/or
sensors/other control units. I hoped the old system J1979 would just
be transferred to CAN, I know little of it but AFAIK it (J1979) uses
Parameter ID's and CAN uses node ID's where one or more parameters
reside, so if you would ask the engine coolant temperature in J1979
you would sent 01 05, I think in CAN it would be 01 [ECU ID] 05.
Just guessing :|).