ALDL, again

[Ward Spoonemore]

Most likely you are unaware that GM has around a hundred different diag data
standards, There are four different data xmission standards, including OBD
II. perhaps is you stated your needs ..... ECM P/N, and or broadcast code
...
Ward

-----Original Message-----
From: owner-diy_efi at efi332.eng.ohio-state.edu
[mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Barry
Tisdale
Sent: Monday, March 01, 1999 7:23 PM
To: diy_efi at efi332.eng.ohio-state.edu
Subject: ALDL, again


Still working on the ALDL / PC thing.  I've gotten *several* copies of the
GM paper on the diagnostic link; all are probably from the same source, way
back when, as they all contain the same typos and inaccuracies.

Has anyone actually 'decoded' the actual data, i.e., converted the raw data
into meaningful information?  Some of the calcs given in the GM paper are
just plain wrong.  Lots of data acronyms have no references elsewhere in the
paper; I can only guess @ what's intended.  Some are obvious, many are
cryptic.

Anybody gone through this?  I'd like to help / collaborate w/ anyone on
this; hardware to get the data from ALDL to COM port is easy, works well.
Software to capture & log the data doesn't require a genius (after all, I
did it in QuickBasic).  Trouble is, "what do it all mean..."?

Any help *very* gladly accepted - thanks - Barry