Send HEX by serial | Arduino Compatible Compiler for LabVIEW Discussions | Forum

Notice the coercion dot on the Serial Write function.  Im guessing you did not wire a U8 array, rather a U32 array, which the Compiler will cast to an 8-bit array.  So that means it will send 0x00 00 00 AA (for 0xAA), etc. but will only send out the number of bytes equal to the number of elements in the array, which looks like what you got.  Simple change the datatype of your constant array to U8.