Re: help ELM32x diagram question

thats it, I have a signal ground (pin 5) and a body ground (pin 4)
with the quoted sentence witch one should I use, witch one they are
refering to ?
to see the circuit please download the following :

http://www.elmelectronics.com/DSheets/ELM322DS.pdf

--- In opendiag@yahoogroups.com, "Madhu Annapragada" <mapr@c...>
wrote:
> Think of the chassis of the car as the sewer system for the
electronics; it
> is actually carrying back all the noise, the spikes the hyper exited
> electrons and the kitchen sink back to the battery. You do not want
all this
> stuff flowing through the ground of your delicate electronics; not
if you
> can help it. So one good way to make sure the stuff in the sewer
gets back
> to the battery without flowing through your electronics first is to
make
> sure that the electronics ground is tied in to the battery ground
as close
> to the battery as possible; commonly known as single point ground
where your
> electronics ground is connected either directly to the battery
ground
> (better) or to the chassis at a single point close to the battery.
Another
> way is to use isolated grounds. I do not know about the circuit you
are
> talking about but if it says the ground signal of the circuit is
not the
> chassis then it might be using isolated ground (using a isolated DC-
DC
> converter, opt isolators etc).
> Regards
> Madhu
>
> -----Original Message-----
> From: mstl01 [mailto:michel_debbie@h...]
> Sent: Wednesday, April 23, 2003 10:23 AM
> To: opendiag@yahoogroups.com
> Subject: [opendiag] help ELM32x diagram question
>
>
> in the diagram description there is a sentence :"the ground signal
> shown throughout the schematic refers to the circuit common and not
> chassis ground" I know very very little about electronic, what the
> sentence mean.
> the power led in the diagram of the 322 is not at the same place has
> the 323 or the 320 is it important ?
>
> thanks in advance.
> Michel St-Louis
>
>
>
> To unsubscribe from this group, send an email to:
> opendiag-unsubscribe@egroups.com
>
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/

 
Received on Wed Apr 23 09:44:10 2003