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Ok, that works for me. My guess is that OBDII devices either have
them connected too, or have chassis ground not connected. Either
way, it's fine.<br>
<br>
Thanks for checking.<br>
<br>
Greg<br>
<br>
<br>
<div class="moz-cite-prefix">Mark Webb-Johnson wrote:<br>
</div>
<blockquote type="cite"
cite="mid:D96E78CE-EC47-48A3-A1EA-C4143DEA3F2B@webb-johnson.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
In all the cars I’ve looked at, signal and chassis ground are
connected (and at multiple points in the car).
<div class=""><br class="">
</div>
<div class="">As we don’t have chassis ground to the OVMS module,
it is not possible to pass it on to the HUD/dongle. Best we can
do is signal ground (which should be connected to chassis ground
upstream).</div>
<div class=""><br class="">
</div>
<div class="">That’s my thinking, anyway.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 4 Apr 2018, at 2:07 AM, Greg D. <<a
href="mailto:gregd2350@gmail.com" class=""
moz-do-not-send="true">gregd2350@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""> Hi Mark,<br
class="">
<br class="">
That's the spec I am currently using. But, I had one
question that I have not heard back on yet, that of
signal ground vs chassis ground. I have them tied
together on the OBDII connector end, but wonder if we
should only connect signal ground, or if they should be
separate wires between both ends, or just leave the
chassis ground unconnected. I've seen it done various
ways in various OBDII hacking diagrams. Is there even a
chassis ground pin on the DA26 connector?<br class="">
<br class="">
Functionally it probably doesn't make a lot of
difference, but for RFI/EMC purposes, it may be
important. I always assigned that task to someone who
knew what they were doing :); I just knew it was
something to be attended to. Without over-engineering
this, what is the right treatment for chassis ground?<br
class="">
<br class="">
15cm cable length should be ok, as HUDs should have long
enough cables to reach under the dash, but my first
reaction was that it seemed a bit short. I guess it
depends on where and how the OVMSv3 module gets
mounted. The cable should be long enough to be able to
to be tied back to the unit and/or its mounting
situation. Otherwise, an OBDII dongle would be forced
to just hang there, potentially over or under one's
feet. Maybe 25cm would be better?<br class="">
<br class="">
Greg<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Mark Webb-Johnson wrote:<br
class="">
</div>
<blockquote type="cite"
cite="mid:47693EB3-86DE-487B-AA58-A430A4FF67CA@webb-johnson.net"
class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<div class=""><br class="">
</div>
Regarding the HUD cable, I have asked the suppliers
for this, according to the following specification:
<div class=""><br class="">
</div>
<blockquote style="margin: 0 0 0 40px; border: none;
padding: 0px;" class="">
<div class="">
<div class="">OVMS 3 HUD expansion cable:</div>
<div class=""><br class="">
</div>
<blockquote class="" style="margin: 0px 0px 0px
40px; border: none; padding: 0px;">
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">Pinout: “HUD"</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;"><br
class="">
</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">J1962-F
DA26-M Signal</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">4
8 Chassis/Power GND</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">5
8 Chassis/Power GND</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">6
16 CAN-H (primary CAN)</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">14
6 CAN-L (primary CAN)</span></font></div>
<div class=""><span class="" style="font-size:
14px; font-family: "Andale Mono";">16
18 +12V Vehicle Power</span></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;"><br
class="">
</span></font></div>
<div class=""><font class="" face="Andale Mono"><span
class="" style="font-size: 14px;">Notes:</span></font></div>
<div class="">
<ul class="MailOutline">
<li class=""><span class=""
style="font-size: 14px; font-family:
"Andale Mono";">Require 120ohm
resistor between DA26 pins 16 and 6
(this can be either at J1962 or DA26
ends).</span></li>
<li class=""><font class="" face="Andale
Mono"><span class="" style="font-size:
14px;">J1962 pins 4 and 5 are both
connected to single DA26 pin 8.</span></font></li>
<li class=""><span class=""
style="font-family: "Andale
Mono"; font-size: 14px;">J1962 end
should be FEMALE plug with straight
cable. DA26 end should be MALE.</span></li>
<li class=""><span class=""
style="font-size: 14px; font-family:
"Andale Mono";">Both ends
should be enclosed in shells, and cable
should be 15cm in length.</span></li>
</ul>
</div>
</blockquote>
<div class=""><br class="">
</div>
<blockquote class="" style="margin: 0px 0px 0px
40px; border: none; padding: 0px;">
<div class=""><img apple-inline="no"
id="E2865559-D78E-4F6A-878A-E54A6ABB0C12"
class=""
src="cid:8C66E0BD-5817-4751-A7A3-2830F75788F3"
moz-do-not-send="true"></div>
</blockquote>
</div>
</blockquote>
<div class="">
<div class=""><br class="">
</div>
<div class="">I think that is correct. If there are
any changes, please let me know.</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 28 Mar 2018, at 7:45 AM, Greg
D. <<a href="mailto:gregd2350@gmail.com"
class="" moz-do-not-send="true">gregd2350@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">Hi Steve,<br class="">
<br class="">
Ha, didn't know that. Thought they were all
DB's... Thanks, corrected.<br class="">
<br class="">
Greg<br class="">
<br class="">
<br class="">
Stephen Casner wrote:<br class="">
<blockquote type="cite" class="">Greg,<br
class="">
<br class="">
A nit: The connector is more correctly
identified as DA-26, see<br class="">
<a
href="https://en.wikipedia.org/wiki/D-subminiature"
class="" moz-do-not-send="true">https://en.wikipedia.org/wiki/D-subminiature</a><br
class="">
<br class="">
-- Steve<br
class="">
<br class="">
On Tue, 27 Mar 2018, Greg D. wrote:<br
class="">
<br class="">
<blockquote type="cite" class="">Hi folks<br
class="">
<br class="">
In a fit of prose, if not Shakespeare, I
took a pass at creating the<br class="">
documentation chapter for the OBD2ECU
task. Comments, corrections, and<br
class="">
general feedback is requested. Is there
anything significant missing?<br
class="">
Mark, if this looks acceptable, can it
be posted to the Google Doc, or<br
class="">
send me an invite such that I can do so?<br
class="">
<br class="">
Note that I don't have any reference
material on the OBDII-to-DB26<br
class="">
cable, other than the wiring. If we
eventually have a purchase source,<br
class="">
that should get referenced, or lacking
that, perhaps pointers to where<br
class="">
the connectors can be purchased?
Placeholders are noted, but only<br
class="">
that. For the EEs in the group, a
question: I have both signal and<br
class="">
chassis grounds connected together on
the OBDII connector; should they<br
class="">
be, or just signal ground?<br class="">
<br class="">
I think it would also be helpful to
include a table of what metrics are<br
class="">
available (supported) on what vehicles,
as an aid to those who want to<br
class="">
remap things for monitoring on an OBDII
HUD or Dongle. A glance at the<br
class="">
available documentation didn't turn up
anything, so I took a first pass<br
class="">
at the table. See the attached, which
includes what I know of the<br class="">
Roadster's implementation (since I have
one and have studied the code a<br
class="">
bit). I would rather not try to guess
at the other cars. Could the<br
class="">
various vehicle authors contribute their
columns to the table? Send me<br
class="">
an updated spreadsheet, and I will do
the merge.<br class="">
<br class="">
Thanks!<br class="">
<br class="">
Greg<br class="">
</blockquote>
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