Opto-Isolated USB to RS232 / RS485 / RS422 Converter (Industrial / Por – CommFront
usb isolator
Industrial adapter USB 2.0 to RS232 RS422 RS485 opto-isolated 8 ports - Cablematic
USB-ISOLATOR - Single Port USB Isolator - ACCES I/O Products
USB Isolator for Protection of all types of USB devices
Optically Isolated USB to Serial Adapter by Emil Johnsen — Kickstarter
Optically Isolated 7-Port USB Hub - Sealevel
Amazon.com: COMMFRONT Industrial USB Isolator, USB 2.0 5000Vrms Isolation (per UL 1577), Low and Full Speed Data Rate: 1.5Mbps and 12Mbps, Plug-n-Play, No Drivers Required : Electronics