Hi Mozill,
I don't know the specific threshold value you need for Stranger's program, but as far as learning a little more about LabVIEW, you may want to check out one of the
interactive tutorials. Also, there are
Serial Example Programs that install with NI Serial and NI VISA. You can find them under Help > Find Examples, then Browse to Hardware Input and Output > Serial.
In his program, he is using a Boolean control to iterate the loop that will send the Write Threshold string.
Hope this helps!
Adam W
Applications Engineering
National Instruments