The "DSU" can be found at:
Install and start this utility.
Click the "Search" button to find the NPort W2150A. After this has been found and added to the list, select the entry NPort W2150A and press "Assign IP". Now change the IP address and gateway. Then click "Assign IP Sequentially" and confirm with "OK" twice. The NPort W2150A now restarts and automatically searches for the device.
Under this IP, the device server can now be reached with a web browser for further configurations.