Zeros in charts

Attached are two vi's. LakeShore samples the temperature at two locations and works. Plot Temperature Data 3 is essentially the same but the plots oscillate between the temperature and zero. Suggestions? Thanks
Attachments:
LakeShore.vi ‏25 KB
Plot Temperature Data 3.vi ‏58 KB

exo wrote:
Thanks. The chart works. However, the concatenated string, output, updates every time it gets a new string, not when all the strings are new and the file is written to too many times.
Also, is that the best way to initialize output?
I don't understand your question with respect to the VI you attached.
The file is only written once after the loop stops
You don't need to initialize the string indicator labeled "output", because it will bet updated as soon as the loop starts. It does not keep any history. And it is definitely useless to write to an indicator and a local variable of the same at the same time. Also if you concatednate 5 empty strings, it is still just an empty string. Too much song and dance!
To clear the history, just create a diagram constant. No need to do fancy composing.
Your two 1000ms waits are pretty useless, because they run in parallel.
There is no need for any sequence structures.
Keep the TCP train horizontally aligned.
Don't label the timer control in ms and then still divide by 1000.
You might want to stop the loop if there is an error.
Typically, duplicate code can go in a FOR loop
Here's a quick draft how you could do some of these things. Modify as needed.
It is a bad idea to grow arrays at the border on while loops with undetermined iterations. You can run out of memory. I would suggest to open the fine outside the loop and write each line as it is received using lowlevel file IO, then close the file after the loop has finished. (not shown in my example). It is much safer to have the data in a file instead of an autoindexing tunnel. If the program crashes or gets aborted, you would loose all data.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Plot_Temperature_Data_4MOD.vi ‏34 KB

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Zeros in charts

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