Devices connected to the PC via USB or GPIB are usually automatically detected and can be selected from the dropdown list of the Device address control. Devices which are connected via ethernet are not detected automatically but the device adderss must either be entered manually in the form
TCPIP[board]::host address[::LAN device name][::INSTR] e.g. TCPIP0::192.168.0.1::INSTR
or the device can be added to the device list using NI MAX. For instructions and more information, visit
https://www.ni.com/getting-started/set-up-hardware/instrument-control/ethernet-connect