what does this mean?

[Dennis_Knutson]

"A U32" and "B U8" are labels. The data types are U32 and U8. Open your LabVIEW Help and from the index tab, enter 'data types'. You might also want to spend some time with the links at http://www.ni.com/academic/lv_training/how_learn_lv.htm or attend a training class.

[altenbach]

The labels are for documentation only. They are also give the element names in this particular case, for clarity when unbundling the cluster. You can call them whatever you want and it won't change the typecast operation per se.

To change the datatype of a numeric (control, indicator, diagram constant), right-click on it and select "representation".

Can you enlighten us what the "mousepeed" program you attached has to do with the typecast discussion. Seems pretty unrelated. 😉

[RavensFan]

Happybird,

Are you looking into the sub'VI's of what you uploaded?  Is that where your question is coming from?  Uploading a VI, saying "here it is" and not pointing out where your questions are coming from doesn't allow anyone to help you.

In the acquire input device sub-VI, I see a typecast function where deviceID (datalog file reference) is getting typecast to I32 to be fed into a DLL.  That is the only place where I can see your question is coming from.  This is a conversion from a more sophisticated labview datatype to something that the DLL function can understand.

Whatever you do, don't mess around with that sub-VI too much or you might end up breaking it.