IN that case just forget about the VT100 part.
Try out the serial examples that ship with LV. If you can make your gizmo work using hyperterminal you are well on your way to pulling of this project.
If you have trouble with specific issues, just post to this exchange with examples of what you have tried, and what you are having trouble with. For the most part you will be better off leaving out the VT100 detail. It only scares people away.
Ben
Proving that there is life after DEC.