Software architecture for multiple device interface

[jfcors]

Hi everybody!

I'm quite new at LabVIEW and I have a question regarding software architecture.

I have to program a software for controlling 3 motorized stage, a camera and a pump. I have separately programmed VI's that control each of them and now I would like to merge them in a single program and I don't know what is the best way to do it.

So far my sub-VIs are made of "event-based" structure that reacts when the users click on pushbuttons. Should I simply put all my sub-VIs (i.e. multiple event structures) in one big while loop? Is it the best way to do it? I've been looking for a while for references about that but I couldn't find any relevant ones and I would really appreciate your help. Also if you know good references please share them to me.

Many thanks!

Bests,

Julien

[User002]

Hi Julien,

I would go with a Stream-based approach implementing a class hierarchy based on InputStream and OutputStream.

When you write to your motors/acutators/AO use a child class of OutputStream

And when you read from AIN/DIN, use an InputStream child.

See for example the Java version of the InputStream class hierarchy.

Br,

/Roger

[jfcors]

Hi Robert,

Thanks a lot for your answer. Could you however develop a bit your because I'm fairly familiar with OOP in Labview but I'm having trouble to find how I should start and what Stream-based approach is.

If you could give me more details or send me a link to references about it it would be awesome.

Thanks again.

Cheers,

Julien

[User002]

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If you could give me more details or send me a link to references about it it would be awesome.

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Sure, have a look at the attachement and see if it could be extended for your use?

It is a fairly simple implementation. I use it for reading for a number of different InputStream devices, such as FPGA DMA FIFO's, sockets, files, etc..

Br,

/Roger