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You can pass clusters to a DLL, with the parameter configured as Adapt to Type. The cluster will be passed by pointer, like a struct. I recommend that you try this for your Show Probe Dialog VI, since it will eliminate splitting and joining numbers. LabVIEW will handle all that for you automatically. You can likewise pass an array of clusters to the DLL using Adapt to Type. Set "Data Format" to "Array Data Pointer." You'll need to create a cluster that matches the format of the Measurement struct. This is easy if you're only using one of the members of the union. If you are using more than one member of the union, then you can either pass the data in a more generic format (for example an array of the correct number of bytes) and parse the data out later, or you can create a struct that matches one member of the union, and then reinterpret that portion of the data when dealing with other Measurement types. See snippet below.