[Diy_efi] Re: J1850 PWM Info Request

[Gerhard Mueller]

Hello Rick Richard

you may want to invent the wheel twice. The Elm PICs ELM320,
ELM322 and ELM323 are ready to go for about CAN$ 15.-
Get the datasheets from www.elmelectronics.com

Gerhard

Am 11-Feb-03 schrieb 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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