[Diy_efi] Re: J1850 PWM Info Request

[Rick Richard]

Yeah, that's the scantool software I plan to use.
What I'm wanting to develop is a device that will bridge the RS232
serial port with the J1850 PWM bus.  The Oki Semiconductor PDF I got
contains the physical-layer PWM protocol specifications, j1850 frame 
structures, and how to implement collision detection on the bus.

It looks like I've found everything I need. =)  It should be a simple matter 
to program a PIC to communicate on the j1850 PWM bus, assemble frames, and 
then send them to the RS232 as ASCII.  From there, the
freediag scantool will extract the data from the j1850 frame and implement 
the rest of the protocol.

From: Jeffrey Engel <jengeltx at yahoo.com>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>Subject: Re: [Diy_efi] Re: J1850 PWM Info Request
>Date: Mon, 10 Feb 2003 14:05:18 -0800 (PST)
>
>Yeah, I just couldn't remember it earlier.
>
>http://freediag.sourceforge.net/
>
>HTH,
>
>Jeff Engel
>--- Rick Richard <saba_apollo at hotmail.com> wrote:
> > Do you have the name of it?
> >
> >
> > >There's also an Open Source project on
> > >Sourceforge.org.
> > >
> > >Jeff Engel
> > >--- Gerhard Mueller <gerhard at tricom.han.de> wrote:
> > > > Hello Rick Richard
> > > >
> > > > you may want to get the ELM320 PIC from
> > > > ElmElectronics.
> > > >
> > > > Gerhard
> > > >
> > > > Am 10-Feb-03 schrieb Rick Richard:
> > > > > I don't understand what the deal is.  I asked,
> > I
> > > > did not demand.
> > > > > I thought the purpose of a mailing list like
> > this
> > > > was to share information
> > > > > and resources.  Perhaps you think it is
> > > > presumptious of me to assume that
> > > > > someone here has this information?  I don't
> > think
> > > > so, because I've read
> > > > > archives of this list where people mention
> > owning
> > > > the SAE book with the protocol information in
> > it.
>
>
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