thank you for your replay hooovahh. this http://www.ni.com/tutorial/3142/en/ link say that Developers who write Real-Time driver code for third-partyPXI, CompactPCI (cPCI) and PCI devices can access the control/status registers (CSRs) and shared memory through a common PCI programming interface provided by NI-VISA.so i follow http://www.ni.com/tutorial/3142/en/ to step 7 and i see my pci card in ni max but i cant read /write data.