Again, I don't understand why you are asking someone here how the data from the pic is being sent. You wrote the code for it and you should know. If you formatted it as ASCI, then you would not be seeing 'weird symbols' and the Array to Spreadsheet would make sense. If you are sending hex data, then you need to convert it and the array to spreadsheet function would make no sense. 'Something like Littel Endian' is not much of a description. You should know EXACTLY what you are sending. You have to describe this if wna thelp in fixing whatever is wrong.
Actually there are several things (why the decimate array, for example) about your VI that do not make any sense to me. I don't understand the decimate array, I don't understand why you are using those serial functions, I don't understand where you even found those serial functions, and I don't understand how you can possibly expect to measure frequency.
