Hi Lan,
This thread is a bit old, so I am not sure if the original poster will ever see this. I did do some searching, and I think I came across the same link as you did on the PAC site, that explictly says for LabVIEW drivers to contact them. I was unable to locate the drivers myself. I would suggest contacting them again, and let them know their website says they have them.
If find anything here, I will be sure to let you know.
Regards,
Kevin H
National Instruments
WSN/Wireless DAQ Product Support Engineer