Using pc parts

[Terry Sare]

     Actually, there are some standards being worked upon. The SAE does 
     have class of vehicle-multiplexing system, A, B, and C. Class D is 
     being worked on.
     
     I don't know a lot about any of this but CAN is Class C and J1850 is 
     Class B. This is from article in Circuit Celler April 96 on Vehicular 
     Control Multiplexing. Combine the two and you get something complex. 
     Motorola has some chips for this also.
     
     Arcnet is a 2.5 Mbit/s hardware link used primarly in factories now. 
     It was one of the first PC networks, etc. before being replaced by 
     Ethernet. SMC makes an 8051 with a built in ARcnet controller and they 
     also make a stand alone controller. They have modified the spec to 5 
     Mbit/sec. The avantage to Arcnet is that the packet times are 
     determistic AND the protocal is handled in hardware. Other than 
     mapping the network, you get an intruppt if the message is for you, 
     otherwise your micro never knew about it. Uses RS485 for a link. Nice 
     and simple for embedded micros.
     TS

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>
>
> So here's a thing. I remember one of those irritating Infiniti commericals
> about a year ago when the the Infiniti poster boy was talking about an
> in-car lan. I know nothing about it. Does anyone? Is there something we
> can salvage from it? What was on it? Are the transcievers cheap?
>
> Thanks,
>      Dan


There's a number of people whom make these car Lan transceivers.
The CAN bus is primarily used by BMW, I think they get their parts from Seimens
but I am not sure.

I (squared)C is another bus type. I am not sure who uses this.

The point is: there is NO standard for automotive communication busses.

If automakers could get together and create a standard bus, the price of the
parts would come down due to economy of scale.

SAE ought to start a standards process to get the ball rolling.

In telecom we do this all the time.

-Dan


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