I am writing my code for the PCI-DIO24 in C. I am trying to enable interrupt. When I configure my function as "viEnableEvent (panelHandle, VI_EVENT_PXI_INTR, VI_QUEUE,VI_NULL)"; I get an error saying "VI_EVENT_PXI_INTR": undeclared identifier. I use the visa 3.01 with new patch file.