Nirmal discussed the hardware interface in his reply to your other posting.
Look at the example that can be found under Help>>>Find Examples>>>Hardware Input and Output>>>DAQ>>>Analog Input>>>General>>>Cont Acq&Graph (buffered).vi That should get you started. Ben <a href="http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=261&HRedirected=True&HUserId=101_3529&RFORMNUMBER=6">Ben Rayner</a> <a href=" http://volt.ni.com/niwc/common.jsp?page=products_certification_cld&node=10638"> Certified LabVIEW Developer </a> www.DSAutomation.com
