The LabVIEW "trick" is usually to get the hardware settings correct. Have you tried "Hyperterminal" to talk to the unit. It is possible that the software supplied by the instrument manufacturer uses odd "end of transmission" chars or something like that.
It is a good idea to start a new thread when you have a problem rather than hijacking over a year old. Someone opening this one might never get down to your question.
PutnamCertified LabVIEW Developer
Senior Test Engineer North Shore Technology, Inc.
Currently using LV 2012-LabVIEW 2018, RT8.5
LabVIEW Champion