How to concatenate string with a numeric control ?

Hi,
How to concatenate string with a numeric control ?
Thankyou.
Solved!
Go to Solution.

Its simpler to just use the Format Into String.
Attachments:
Format Into String.png ‏11 KB

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Optics experiment requires to control with a numeric control or string, but source code is having trouble

Hello,
I'm working with my professor on an optics experiment and we are trying to control a fast steering mirror with LabVIEW. We bought the mirror and power supply from piezosystemjena. They provided a LabVIEW code that works.
The problem is that right now, the code can only be controlled manually. We wish to have LabVIEW control it based on inputs received from other sources. The LabVIEW code is controlled in either one of two ways. A knob can be used to change the value of the voltage to move the mirror. Also, a command can be sent to control the voltage. In both cases, the "channel" is specified. In our situation, we have two channels, a X and a Y channel for the axes of the mirror.
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Is there any way to get a concatenated string to function as a control, where I wouldn't have to physically type something in, but instead have LabVIEW determine the values?
I'm attaching the VI's for reference. The VI from the company is quite complicated, so I'm hoping I won't have to alter it too much. I'm sure there's a simple answer just using the sub VI.
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Message Edited by Support on 11-06-2009 08:28 AM

Hi R0B0T,
Here is some example code to get you started.
There are two vis: Control.vi and app sim.vi The “control vi” simulates your “trying to control with concatenated string.vi” and the “app sim.vi” simulates your d-drive application.
To use these vis, open both front panels. Run the Control vi and change the control values. See how the data is received by the app sim vi.
Notice in the Control.vi how I generate a value change event for the concatenate function using a value signaling property node. This is required by the receiving app to be able to detect that a change has occurred.
Also note that I passed through a stop event to close the app sim vi. The d-drive application does not have an input for this and that is a problem. To cleanly stop the d-drive app you will need to add this functionality (or live with having to stop both vis separately). You will have to read the stop value in two places – in the event structure (lower loop) and also in the while loop (upper loop). I decided at the last moment to include this functionality in the app sim vi so you could see what that might look like.
Note that in the app sim vi I have a comment about dealing with your knob vs numeric issue. This should give you an idea of what you are up against. It really isn’t too hard if you are able to understand these examples.
steve
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
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Attachments:
Control.vi ‏14 KB
app sim.vi ‏14 KB

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How to concatenate string with a numeric control ?

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