Re: [opendiag] DCD/DTR/DSR signals, loopback test, connector layout, component choice

Hi,

I changed the K-line's optoisolator's series resistor to 500 ohms, and
the test with Hyper terminal now works. But the diagnostics from car is
still not working correctly. Only information which works is the
AIRBAG-information. I cannot get for example engine information, it only
tries and tries and tells that no response from controller. I have now
connected RTS-wire to GND ( the wire from adapter pin 7 to pin 5). I also
tried with normal connection ( the wire from adapter's pin 7 to pin 7).

I use the VAG-COM program. Could there be a bug in the program or has
someone got it work correctly. The car is Passat V6 syncro -98 and it
has no L-line in the diagnostics connector.

>From: Jeff Noxon <jeff-opendiag@...>
>Reply-To: opendiag@egroups.com
>To: opendiag@egroups.com
>Subject: Re: [opendiag] DCD/DTR/DSR signals, loopback test, connector
>layout, component choice
>Date: Wed, 30 Aug 2000 10:32:04 -0500
>
>On Wed, Aug 30, 2000 at 07:37:56AM -0000, arnold.neugebauer@... wrote:
> > Jeff described a way to test the adapter with a terminal program
> > (loopback over the K-section, it does not test the L-section). I had
> > no success with this method (I tried three different notebooks). RTS
> > was always high and therefore reception disabled regardless of the
> > flow control used. Perhaps there are serial interface chips or drivers
> > where RTS defaults to low, when the flow control is disabled and it
> > works. In general it does not. Nevertheless it's a good way to test
> > the adapter.
>
>RTS is set by software. My trick was to use a comm program that would
>let me force RTS low. Actually, I modified the Linux version of Minicom
>to do that. I might have forgotten to mention that to a few people. :-)
>
>Another solution I used (under Windows) was to grab RTS from the second
>serial port. As long as it is not open by an application, it will be low.
>
>Thanks for your comments!
>
>Regards,
>
>Jeff

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Received on Sat Sep 02 07:08:32 2000