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Quick Question about Strings

Hello,

 

I have some questions about the attached code (somebody else wrote it). 

 

First, what is that block with the arrow pointing to the left with a dot beneath it? I've never seen it before, can anybody identify it. 

Second, why would the output of the concatenate strings be wired to the aforementioned arrow block? Could anybody think of a case where this would be useful (of course it probably would help if I knew what the arrow block was in the first place)? It looks as if the output of the concatenate strings is continually looping back to new inputs so that worries me. 

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It's a feedback node. If you have the VI file and open it in LabVIEW you can press Ctrl+H and hover over the item to learn more about it.

 

Similar functionality to a shift register so I would agree that continuously concatenating the strings from a VISA read operation is not good as you would eventually just run out of memory from having to store every value returned.

Matt J | National Instruments | CLA
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