Schafbo,
I'm not sure what your question is. Are you just looking for a way to set the AI coupling in LabVIEW or are you looking for an example to use with your module?
You can set the AC/DC coupling programmatically in LabVIEW using a DAQmx Channel Property Node, with the AI.Coupling property.
I hope this helps!
Patrick O.
Applications Engineering
National Instruments