Hi, 
I am currently working with LabVIEW 8.5  FPGA and PXI 7831R card for HDLC protocol Implementation.To start with I refered implemented code from NI site in the following link, 
http://zone.ni.com/d...a/epd/p/id/5339 
While I am running I am getting Received message Zero all the time irrespective of the Input command.If any of you worked with code please give input on this. 
Thanks, 
Nataraj.