You can communicate with a BASIC Stamp microcontroller over serial using VISA. In LabVIEW go to Help, Find Examples and search for serial. This will show you the basics of serial communication in LabVIEW. Also after performing a quick search on Google I found this link:
http://www.parallax.com/html_pages/downloads/software/software_basic_stamp.asp
Here you can download an example using LabVIEW 7.0 or higher to communicate with a BASIC Stamp 2.
Shawn B.
National Instruments