[Ovmsdev] OBDII ECU Documentation, and a request for help

[Stephen Casner]

Greg,

A nit: The connector is more correctly identified as DA-26, see
https://en.wikipedia.org/wiki/D-subminiature

                                                        -- Steve

On Tue, 27 Mar 2018, Greg D. wrote:

> Hi folks
>
> In a fit of prose, if not Shakespeare, I took a pass at creating the
> documentation chapter for the OBD2ECU task.  Comments, corrections, and
> general feedback is requested.  Is there anything significant missing?
> Mark, if this looks acceptable, can it be posted to the Google Doc, or
> send me an invite such that I can do so?
>
> Note that I don't have any reference material on the OBDII-to-DB26
> cable, other than the wiring.  If we eventually have a purchase source,
> that should get referenced, or lacking that, perhaps pointers to where
> the connectors can be purchased?  Placeholders are noted, but only
> that.  For the EEs in the group, a question:  I have both signal and
> chassis grounds connected together on the OBDII connector; should they
> be, or just signal ground?
>
> I think it would also be helpful to include a table of what metrics are
> available (supported) on what vehicles, as an aid to those who want to
> remap things for monitoring on an OBDII HUD or Dongle.  A glance at the
> available documentation didn't turn up anything, so I took a first pass
> at the table.  See the attached, which includes what I know of the
> Roadster's implementation (since I have one and have studied the code a
> bit).  I would rather not try to guess at the other cars.  Could the
> various vehicle authors contribute their columns to the table?  Send me
> an updated spreadsheet, and I will do the merge.
>
> Thanks!
>
> Greg