Nochmal Thema VAGCOM-Adapter | Posts 16+

christians wrote:

The IC doesn't need much "accessories". Therefore, there would be more likely fewer parts than more.

Hi Christian,

Unfortunately, the MC 33199 does not offer a conversion between OBD and COM port signals, which means that the "stuff to the left of the optocouplers" must remain in some form .

Hi Ulf,
To convert the driver's output signals (TTL) to the serial interface, you could use a component from the MAX232/233 family.

Best regards, Rudi.

I was just on the English-language VAG-Com forum.
The problems with my AAT BJ92 are (also) related to VAG-Com. U. Ross writes that all "very old" Audi TDI models operate at 240 baud, which needs to be set in the options. I will try this as soon as possible. Ross has problems with these vehicles because 1. TDI models were only sold in the US starting in 1996, and 2. [The sentence is incomplete]. Other protocol parameters also differ.
Christian

I've now tried 240 baud, but unfortunately, without success. Similarly, using our oscilloscope didn't work; it can't save the waveforms, and I lack the experience to interpret everything I'm seeing. Furthermore, the battery ran out, so I had to postpone the experiment. So far, I've only observed that the voltage levels on the live object fluctuate between a maximum value and near zero, which the slow multimeter can't display. It was also clear that the engine control unit responded at a much lower frequency than the ABS system.
Christian

christians wrote:

It was also clear that the engine control unit responded at a much lower frequency than the ABS.

Hi Christian,

That would actually align with the statements made by Ross, so perhaps the adapter isn't the "culprit" in this case.

Hi Ulf,

That's also my concern. After all, I can modify certain components without interrupting the communication with the ABS. Since I currently only have the shareware version, I don't know what happens when data blocks are received.
Unfortunately, U. Ross is also very vague when it comes to details regarding protocols and baud rates. Probably because the data obtained through reengineering represents its true asset.
I'm also going to try using the microphone input of the sound card, along with appropriate software, as a storage oscilloscope. However, it probably won't work perfectly because the inputs are typically connected capacitively, which means you can't measure DC voltage levels. Let's see how a switching process can be represented with this.

Best regards, Christian.

christians wrote:

I'm also going to try using the microphone input of the sound card, along with appropriate software, as a storage oscilloscope. However, it probably won't work perfectly because the inputs are typically connected capacitively, which means you can't measure DC voltage levels. Let's see how a switching process is represented with this...

Hi Chris,

As long as the lower frequency limit of the input is sufficiently low (20 Hz or less), a usable representation should be possible.

While the "roofs and cellar floors" of the rectangles will slope more or less diagonally towards the zero line (like with an oscilloscope using AC coupling), this only happens with relatively long, slow pulses.

HI

I've finally found the problem after numerous successful dry runs. I had to remove resistor R15, which disconnected the ground connection. Since then, there have been no more problems, and the position of the person being dominated doesn't matter.
Now I'm having problems with the German VAG-COM version DRV 208.2; it's not very stable and crashes quite often.

Niemand wrote:

I have finally found the error after numerous successful dry runs. I had to remove R 15, which in turn interrupted the ground connection. Since

, there have been no more problems, and the position of the

Quote:

doesn't matter. Hi. Interesting... I thought 100 ohms couldn't cause any interference. What kind of computer/laptop do you use? Power from the ship's electrical system? If the laptop were only powered by the battery, the "cause" of the issue with R15 would be even more puzzling...

Now I'm having problems with the German VAG-COM version DRV 208.2; it's not running very stably and crashes quite often.

Quote:

Hm, and which software did you use, as you mentioned above?

no more problems ?

Hello Ulf,

I don't understand why you're not using a 7810 voltage regulator for R19. For just a few cents, you could compensate for the voltage fluctuations. Have you tried it yet?

AndyO wrote:

I didn't understand why you didn't use a 7810 voltage regulator for R19. You could compensate for the "floating" around the operating voltage for just a few cents. Have you tried it yet?

Hi Andy,

Sure, a 7810 or similar would provide stable voltages.

But I want to provide the car's K and L lines, which are used as high-level signals, with the least possible reduced onboard voltage.
And with the engine running and a Ubatt of approximately 14 volts, you would already be missing about 4 volts after a 7810 regulator.

Hello,

Does anyone have any idea where I could get a MC33199?
I still can't find anything about that online.

Thank you in advance for the tips.

greetings
Sure.

MC33199 and MC33290 can be found at .

Regards,
Okay, hier ist die Übersetzung:

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