Hello ! I am new here and I would like to ask a question about Labview. Can you help me ? Actually, I am working on a project with a PIC. The PIC sent 3 informations (that evolves in time) to Laview (in my case, it is current, tension and time) To send these informations, I use RS-232. Moreover, I have used examples from Labview called 'Basic Serial Write and Read'. It is great ! It works and Labview can display my values thus : 'current;tension;time\n' I would like to display these datas on 3 graphs. I think my first step should be : De-multiplexing or try to convert my data (string made by RS232) into float. What do you think ? How can I do that ? Thanks for your help and advices.

Your graphs are actually charts. Charts keep a history. You can use a property node to clear out the history. Why are you still using the Run Continuously? Stop that. You should just use the Run. And don't use the Abort. Close your port when you are done. Do you even need that loop for writing? It doesn't make sense that you would request something without looking for the response. You have things on your front panel way too spread out. Try to reduce what you have and fit it all into a single screen. Here's what a cleaned up version of your block diagram should somewhat resemble:

LabVIEW

RS232 and Graph

Solved!

And your jpeg doesn't show an error. It just shows a waveform chart that is continuously zero.

Do you have any error handling in your VI? Anything that shows errors on a VISA read, or perhaps a conversion from the string read in to the numeric data you are plotting on the chart?

You should put some error indicators in your VI, and an indicator that shows the string that is being read in by the VISA read. It can help you debug the code while it is running.