At
http://www.opendiag.org/ there seems to be a project to get at the ODB-II bitstream as well as "crude" designs for converting to RS232.
From their mailing list :
"We are about to release an alpha version of ODBII scantool stuff for Linux.
Its early version, only supports K line type interfaces [not VPW/PWM ones as
I dont have a VPW/PWM car], and isnt GUI based.
It will be opensource, and on sourceforge.
It supports "Jeffs" interface (and the Andy Whittaker derivative), the
Multiplex-Engineering interface and the Silicon Engines interface. I dunno
anything about Alex's interface but I would imagine its similar to Jeff/Andy
[i.e a rs232 to K line converter][anyone got some more details of Alex's
interface ??]
Im just trying to make time to do some web pages etc and test the code on my
new PC after my development box and my power supply blew up :-( Its sort of
been sat on my box waiting for a couple of months now ...
Andy Whittaker is working on porting it to Windows aswell
One of us will write VW specific code soon [I need to borrow someone else's
Audi stereo to complete that]
Regards
Richard"
-Kit