Thanks for your reply
VISA resource i am using is INSTR as i connect device via ethernet. Since its ethernet i have to add device to NI MAX with resource name INSTR if not VISA is not detecting device. Can i communicate using socket in NI VISA? If so could you please tell me how. Because i am using socket option in my CAPL driver and i think this could help in developing my driver too.
You could try specifying to use the connection as a SOCKET instead of INSTR resource and see if that makes any difference. This article shows how to construct your VISA resource name: http://digital.ni.com/public.nsf/allkb/80C28CC795611E4A86256AB100209521
Thank you for your reply and providing information. I created TCPIP socket to connect to device and it is not working as device supports INSTR. I shall contact my vendor and ask for solution.