There are already transceiver IC's available that will detect and convert
anyone of the three protocols to RS232. I have an adapter cable that I use with
my laptop that allows me to monitor all the OBD-II functions on anyone of the
protocols. There is also one available to adapt to a Palm Pilot.
Dave Clement
99 SLT+ CC 4x4
In article <crucrc$8gj$1@bent.twistedbits.net>, jon@dakota-truck.net writes:
>
>
> "Jason Bleazard" <dml@bleazard.net> wrote:
> : On Wed, January 5, 2005 1:11 pm, jon@dakota-truck.net said:
> :>
> :> That would be an interesting product though - a device you can
> :> wire into your OBD-II port, which will mimic a properly functioning
> :> computer, except for the codes. To be sold for novelty use only,
> :> of course... ;-)
>
> : I'm sure it already exists. When you're debugging any communications
> : protocol, you have to debug one side at a time, which means you need to
> : have some way of faking the data coming from the other side.
>
>
> Yep - I'm sure they've got all sorts of toys like that out there
> at the DC tech center. :-)
>
>
> : What does the communication look like, anyway? Doesn't it just go across
> : a standard serial port? That can probably be done with a Palm Pilot once
> : you figure out the wiring specification.
>
> : Theoretically speaking, of course.
>
>
> I actually looked into this - a few years ago, a couple of friends
> and myself were thinking of making a code reader that could be used
> by a Windows CE, Palm, Laptop, etc. There are basically 3 different
> protocols (ISO, PWM, VPW), and various manufacturers use different
> protocols. Chrysler mainly uses the ISO protocol and IIRC, Ford uses
> PWM, those are the only two I remember, but there are lists out there
> showing what manufacturers/vehicles use which protocol.) Anyway,
> long story short, it wasn't exactly a cut and dry, nice simple
> serial protocol. Between that, the cost of the research materials
> we would need to write the protocols and the appearance of lower cost
> code readers entering the market at about the same time, we scrapped
> the idea.
>
> --
> -Jon-
>
> .-- Jon Steiger ---- jon@dakota-truck.net or jon@jonsteiger.com --.
> | 1970 Barracuda - 1990 Dakota 'vert - 1992 Ram 4x4 - 1996 Dakota |
> | 1996 Intruder 1400 - 1996 Kolb FireFly - 2001 Ram QC 3500 CTD |
> `------------------------------------ http://www.jonsteiger.com --'
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