Yes, you can determine which PXI chassis (model number and manufacturer) you are connected to, through the use of VISA property nodes, and the PXI Backplane VISA resource. Take a look in the NI-VISA Help document, under Interface-Specific Information -> PXI/PCI -> Other PXI Resource Classes and VISA. This section will describe how to access the PXI BACKPLANE resource. You'll need to pass this VISA resource into a property node (assuming you're using LabVIEW). On the property node, select General Settings -> Model Name, as shown in the attached screenshot, to access the model number of the PXI chassis.