24 Rockwell Automation Publication ENET-UM004B-EN-P - November 2015
Chapter 2      Configure EtherNet/IP and USB Drivers on Your Workstation
5. In RSLinx Classic software, from the Communications menu, 
choose RSWho.
The RSLinx Workstation organizer appears, and your module appears 
under two different drivers, a virtual chassis and the USB port.
USB Port Driver
Virtual Chassis Driver