Re: [opendiag] Programming

Barry,

So far most of us have been playing with the VAG proprietary protocol.
I have a copy of VWtool, which works with the schematic on my website.
I have not made any attempt to reverse engineer this protocol, although
at least one other person has spent some time with it.

The VAG protocol runs at 9600bps, which greatly simplifies the hardware
required to connect the vehicle to a PC. The OBD-II standard specifies
10.4kbps.

Check out this web site:

http://www.ross-tech.com/vag-com/index.html

This guy has some beta software you can download for free. It is supposed
to work with the VAG protocol, and should be compatible with the schematic
on my website. You may be able to reverse engineer what you want out of it.

Also, the Society of Automotive Engineers (SAE) sells a book that contains
most of the parts of the OBD-II spec. I think it sells for about $95,
and a new version comes out annually. I don't remember the name of it,
but you can probably find it on the SAE website. I haven't bought a copy
(yet), but I do have copies of the ISO 9141-2 spec which came in handy
while working on the hardware interface. SAE sells ISO9141-2 as well...

If you want to do any programming, I think you'll find the SAE book very
useful.

If you write any software, I encourage you to release it under the GPL so
that others can contribute. VW/Audi users everywhere could really use a
good, free tool that can be modified easily...

Good luck,

Jeff

On Wed, Jul 05, 2000 at 08:15:55AM -0000, barry@... wrote:
> There is a lot of talk about the hardware here, but does anyone
> have any tips on programming for this interface? I am trying to find
> out Engine Speed, Load, and vehicle speed while the car is running.
> using VB or C++.
>
> If anyone could point me in the right direction i would be very
> grateful.

 
Received on Wed Jul 05 10:58:28 2000