Help with LabVIEW DAQ application architecture

[webcmc]

Yeah, I realized that once I opened it and took a look at it 🙂

- Chris

[webcmc]

I think I understand your concept of using a FGV, but I'm not sure I understand the mechanics. I haven't heard the term 'USR' before, what is that?

- Chris

[JLS]

Hello,

From the context of the conversation, USR likely refers to Uninitialized Shift Register, which for a FGV (Functional Global Variable) is really the heart.  The USR is the object which allows you to store data across independent instances and/or executions of a subVI (provided that subVI is NOT reentrant, which is a VI property that insures separate memory spaces for each instance of a subVI).

I hope this clarifies things!

Best Regards,

JLS

[webcmc]

Ah - that makes sense. I'm still getting used to the acronyms 🙂

I'm working on an implementation for the low speed acquisition using an fgv. I'll post it when I've got something worth reviewing to see if I'm on the right track.

[webcmc]

I put together a little prototype to simulate the low speed data acquisition based on my understanding of the comments everyone has sent. (Thanks everyone)

It is meant to simulate the low speed data being acquired constantly and being able to reference a subset of the data 'real time'. It seems to work pretty good for low speed data, but I'm not sure how I'm going to handle the high speed data at ~24kHz sampling rate.

Attached is a zip file with the build distro files. Take a look and let me know if you think I'm on the right track or if you think there might be some design issues with this approach.

- Chris