There are several Modbus libraries for older versions of LV floating around the web and searching Google for "Modbus" and "LabVIEW" should give you some results. I believe one of them was made by Air.
NI made a Modbus library, but that was for 7.1.
I backsaved it for 6.0, so if you want, you can try to open it and see if you can fix it so that it will work.
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