Grouping Measuring Values

[morris39]

I need help to group values from Controllers 01 and 02. My car S3 (8v) is on UDS and there are no DTCs (I have posted comp. Autoscans here) What I did: opened a file DSG.csv in a new VCDS folder, Value Groups. I could only open the new folder from the main screen, not from Select screen and then selected GP 01 values (4) and chose Log. I then had to restart VCDS and repeart for GP 02 as above. When I exited VCDS logging of GP01 stopped but GP02 logged OK. Repeated couple of times but no joy.
The file exists and can be loaded but only accepts the last GP chosen.So I need more detailed instruction it seems.

 

[Uwe]

You can't read data from 01-Engine and 02-Transmission at the same time.

-Uwe-

 

[morris39]

Thanks. Do you mean just GP 01 & 02 cannot be combined or any different groups? If the latter the Manual description is misleading or I can't read.and troo bad.

 

[Uwe]

Thanks. Do you mean just GP 01 & 02 cannot be combined or any different groups? If the latter the Manual description is misleading or I can't read.and troo bad.

Perhaps we have a terminology issue. What do you mean by "GP"?

-Uwe-

 

[morris39]

Group= grouping of measuring values under a master controller e.g. 01 Engine.My attempt was to combine the engine 01 and transmission 02 measuring values.I wanted to determine how long/far is required to bring the DSG temperature to specified temperature for level measurement and/or cool down. As the laptop is on the back seat (I'm alone) I need to log.not observe.

 

[Uwe]

Group= grouping of measuring values under a master controller e.g. 01 Engine.My attempt was to combine the engine 01 and transmission 02 measuring values.I wanted to determine how long/far is required to bring the DSG temperature to specified temperature for level measurement and/or cool down. As the laptop is on the back seat (I'm alone) I need to log.not observe.

OK, I suppose I did understand you correctly then.

No, you cannot access 01-Engine and 02-Auto Trans at the same time.

I'm not sure where you got the idea that this is possible. Can you please tell us what in our documentation led you to think that it is?

-Uwe-

 

[morris39]

This Support Screen:Online Demo / Manual - Advanced Measuring Values
This sentence:This function expands on the Measuring Blocks function and lets you select up to 12 measuring values from as many as 12 different groups from a selection dialog that shows the contents of the measuring values.
Down to meaning of: different; measuring values; groups

 

[PetrolDave]

This Support Screen:Online Demo / Manual - Advanced Measuring Values
This sentence:This function expands on the Measuring Blocks function and lets you select up to 12 measuring values from as many as 12 different groups from a selection dialog that shows the contents of the measuring values.
Down to meaning of: different; measuring values; groups

The groups have to be within one module, if you could have groups from multiple modules then the word "modules" would have appeared in that description.

Note to Ross-Tech: may be worth adding a specific note that the groups can only be from one module?

 

[morris39]

Consider changing "This function expands on the Measuring Blocks function and lets you select up to 12 measuring values from as many as 12 different groups from a selection dialog that shows the contents of the measuring values"

to: "This function expands on the Measuring Blocks function and lets you select up to 12 measuring values from any one of 12 different groups from a selection dialog that shows the contents of the measuring values"

A bit pedantic,no? It would be helpful to have formatting to clarify.
Thanks Dave.

 

[Uwe]

Consider changing "This function expands on the Measuring Blocks function and lets you select up to 12 measuring values from as many as 12 different groups from a selection dialog that shows the contents of the measuring values".

A "Group" is not a control module.

But I have clarified the wording on that page.

-Uwe-

 

[morris39]

A

But I have clarified the wording on that page.

-Uwe-

Thanks, impressed.

 

[dnoermann]

@Uwe can you explain why it is not possible to Log Values from Different ECU's together ? I dont need to group them, only need them logged Timely as nearly tother as possible.
Is this a VW Can Bus problem, or is it more a VCDS Architectural Problem, since VCDS can only communicate to one ECU at a time.

 

[Uwe]

@Uwe can you explain why it is not possible to Log Values from Different ECU's together ?

Because under all the old protocols (K-line through TP-2.0) diagnostic communications session is established with one control module at a time. The only exception is when multiple modules are part of a functional group ("functional addressing") where a request is made to a single address, but multiple control modules respond. This can happen at generic OBD-II address 0x33, where if the vehicle is equipped with an automatic transmission, both the ECU and TCU will answer some requests, and at address 0x31 (the functional address for engines with dual ECUs).

I think with UDS it might be possible to make requests without establishing a session at all, but then the problem becomes an architectural one; VCDS would have to load ASAM data for each module you want data from and it isn't designed to do that.

-Uwe-

 

[dnoermann]

Thanks, understood.
Since i am working only with the cool new UDS Stuff i will implement a simple python CAN solution for my tests than.
And yes a Diagnostig Session is not needed, i can just query Values if i know CanId and Address in Device.
And here VCDS is a very good help