Basic concept about UDS: ECU types

[huunhan]

Hello everyone,

I am new to UDS. I did about CAN protocol before, I had a CAN Bus system with 3 nodes. Now I want to use PCAN-USB to test a CAN-based UDS project. In my understanding, UDS is the message protocol communicating between Tester and ECU, as shown below:

So the Tester will be the PCAN-USB, but I don't know how to have the ECU. Do I need to buy a real ECU? Or using an ECU Simulator? What type of ECU do you usually use?

Is my concept of the whole system as shown below correct?


Any suggestions are very appreciated.

Thank you in advance.

Best regards,
Nhan Nguyen

[M.Heidemann]

Hello,

You would use UDS in case you actually need to communicate with an ECU.
If that ECU is physical one or a simulated one is not relevant, as long as it
adheres to the UDS-protocol and is able to send messages on the Bus.

Without an ECU or a simulated ECU there is not much reason to use UDS in the first place.

Further introduction to UDS can also be found in the PCAN-UDS API docuemntation:

https://www.peak-system.com/produktcd/P ... an_eng.pdf

The setup shown in the diagram is correct.

Best Regards

Marvin

[huunhan]

Hello Marvin,

Thank you for your quick response.

Without an ECU or a simulated ECU there is not much reason to use UDS in the first place.

Because I am working on a project related to UDS. I will work with real ECU in real car later on, currently only in the design and testing process, so I need to test with device as close to real ECU as possible.

I have one more question: can the PCAN-USB be programmed to be an ECU Simulator as shown below?


Thank you!

Best regards,
Nhan Nguyen

[M.Heidemann]

Hello,

Yes, you can do that.

Please have a look at the example:

PCAN-UDS\Samples\C++\05_server_simulator\

in the PCAN-UDS package to see how this can be implemented.

You can also build the example-application and use it for this purpose,
if it fits your needs already.

Best Regards

Marvin

[huunhan]

You can also build the example-application and use it for this purpose,
if it fits your needs already.

Hello Marvin,

In that case, can I use PCAN-USB Pro, which has 2 x CAN channels?
I mean 1 CAN channel is used as the tester, 1 CAN channel is used as the ECU Simulator.

Best regards,
Nhan Nguyen

[M.Heidemann]

Hello Nhan,

yes, you can do that with a 2 channel PCAN-interface.

The channels are handled independently from one another,


Best Regards


Marvin