VISA does not read the data as ASCII. You have chosen to display the data as ASCII. Right click on your string indicator and select 'Hex Display'.
It seems you have some very convoluted logic for getting the data. I imagine that most of that code can be discarded. Why don't you do a capture, stop the vI, and go to Edit>Make Current Values Default, and then save the VI. You now have a VI with actual data saved with it and someone can look at that without having your instrument. Post that VI with an explanation of what the data is supposed to represent. Attaching the manual would be great.
