On Fri, Jun 9, 2023 at 2:30 PM <markw at mohawksoft.com> wrote: > pi at pi-top:~/scpi $ lsusb You might try 'lsusb -v' to see if any details are different. Or 'lsusb -t' if you can connect the devices on different sides or front/back of your computer. Youmight be able to figure it out based on neighbors to where they are connected. Bill Bogstad