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For the clSerialInit you want that parameter to be a pointer sized integer, Pass: Pointer to Value. For the other function make it a Pointer sized Integer, Pass: Value. If you pass this value around through VI connector panes, always make it a (u)int64 bit integer. Don't forget to call the clSerialClose() function or whatever it is called. The clSerialInit() function allocates resources (and almost certainly opens the serial port underneath making it inaccessible for anyone else until it is closed properly). If you don't close this resource properly you would create a memory leak and likely make the port inaccessible when starting your program again.

Here is what happens: Scalar JSON text to Variant.vi uses the index output of the Search 1D Array function (I32) for the Enum value (U16). JSON to Map.vi then uses Variant To Flattened String (special).vi to extract the data. Enum U16 has 2 Bytes but I32 has 4 Bytes of data, so the Map data gets offset by 2 Bytes for each Key. Scalar JSON text to Variant.vi uses the output of Get U32.vi for all unsigned integers. JSON to Map.vi then uses Variant To Flattened String (special).vi to extract the data. U16 has 2 Bytes but U32 has 4 Bytes of data, so the Map data gets offset by 2 Bytes for each value. The solution is to cast all values according to their respective types. Here are the two offending sections for your particular case: