Just out of curiosity are you working on a FIRST robotics project? Just wondering since they use Launchpad.
Anyways, I would suggest that you take a look at all of the examples that come prepackaged with LabVIEW. You can find them by going to Help>>Find examples in any LabVIEW window. In particular I would have you look at the Hardware Input and Output>>Serial>>Simple Serial.VI It gives a pretty good explination and example of how to check connection using the *IDN command. Good luck!