VAG-COM PC: Which Computer to Use?

Hello,

After creating four different interfaces – one based on Noxon, two more using optocouplers, and one using a MAX232 – and none of them being recognized, I'm starting to get desperate. Could the problem be with the PC?
I tested a 486 computer with Windows 95 and a brand new computer running Windows XP. Is one too new and the other too old?

Regards,

Thorsten.

Hi.

That's quite remarkable... For example, download the adapter test software from the diagnostic article along with the instructions and use it to thoroughly test the components.

Which adapter designs have you replicated?

Hey,


As I said, once using Jeff Noxon's method, twice using the ILD 74, and once using the MAX232, following this link: http://www.klippklapp-klepp.de/Elektronik/Autoelektrik/OBD-Interface/Optimalschaltung/optimalschaltung.htm.

Will the adapter be recognized if there is no K-signal, meaning it only has voltage?

dokatoto wrote:

As mentioned, once using Jeff Noxon's method, twice using the ILD 74, and once using the MAX232, according to this link: http://www.klippklapp-klepp.de/Elektronik/Autoelektrik/OBD-Interface/Optimalschaltung/optimalschaltung.htm.

Hi.


What does twice with the ILD 74 mean?

What resistor values, etc., did you use for the "optimal circuit"? I couldn't find anything about it when I quickly glanced at it...
Furthermore, it appears that Maik's circuit has been more or less copied here, which is evident from the presence of the trimmers.

Quote:

Is the adapter recognized when there is no K-signal, i.e., when it only has voltage?

Normally, yes, a vehicle-side K-signal is not required.

I've already sent you the instructions via email.

The simplified version can be found at the following link: http://hal9000.vc-graz.ac.at/3rdfloor/projects/diagnose/Diagnose-Interface.htm.

My computer didn't recognize the adapter.

Best regards,

dokatoto wrote:

I sent you the instructions via email.

"Thanks, it arrived, but it hasn't been 'processed' yet."

Quote:

The simplified version can be found at the following link.

That is likely also the Noxon circuit in practice.

Quote:

My computer didn't recognize the adapter at all!

Here's another tip: the adapter test software can be very helpful when troubleshooting, especially if you understand the basic function of each adapter circuit.

Hello,

I am running Ulf's Adapter V2.2 and V2.4 with a 486DX40 and 16 MB of RAM under Windows 95b without any problems.

Best regards,
Andreas.