Ferrari Mailing List: Re: Need help with stereo in Ferrari

[Doug and Terri Anderson (dnt]

Thanks Jim - you should teach the class - the first thing the instructors 
did was scare the ---- out of us.  Guess it was their way of keeping us 
awake, eh?  Sorta worked.  heh heh
DOUG

----- Original Message ----- 
From: "Jim Conforti" <lndshrk [at] xmission.com>
To: "Doug and Terri Anderson" <dnt [at] dock.net>
Cc: <ferrari [at] ferrarilist.com>
Sent: Sunday, March 08, 2009 10:56 AM
Subject: Re: [Ferrari] Need help with stereo in Ferrari


> At 11:06 AM 3/8/2009, you wrote:
> > I recently attended a diagnostics OBD II class covering the new onboard
> > communications protocol called CAN (Controller Area Network). For 2008, 
> > CAN
> > is used on all U.S. passenger cars and light truck.
> >
> > Found a break in a wire?  Want to repair it?  This touchy system requires 
> > an
> > exact number of twists per inch, same length and gauge wires and don't 
> > even
> > think about splicing unless you hold an ME in advanced auto electronics.
>
>   Doug,
>
>   Just FYI - this has to be nonsense that some regulatory agency has
>   come up with.  Or someone is trying to sell special "CAN solder" - LOL.
>
>   In reality, you can run CAN thru two straightend coat hangers for
>   a short (few feet) distance - or untwisted ribbon cables.
>
>   I think they are trying to scare everyone.
>
>   CAN (for example) has been used in the internal networks of BMW's for
>   many years.  The legislated use of CAN as a diagnostic layer merely
>   added "one more" CAN bus to the car.  This one at 500mbps.
>
>   FWIW, CAN was invented by Bosch specifically for use in vehicles
>
>   http://www.semiconductors.bosch.de/pdf/can2spec.pdf
>
>   If someone is interested, here's an appnote by Microchip.
>
>   http://ww1.microchip.com/downloads/en/AppNotes/00228a.pdf
>
>   If someone is REALLY interested, ISO-11898-2 specifies the physical 
> layer.
>
>   Generally UTP (unshielded twisted pair).
>
>   Just be neat in your soldering and you should be fine.
>
>   Similar to terminating a network cable try to "untwist" only the very
>   minimum necessary for a repair.
>
>   Jim