Opto-Isolated USB to RS232 / RS485 / RS422 Converter (Industrial / Por – CommFront
USB to RS485 Isolated adapter / converter
4-Port USB to RS-232 w/ Optical-isolation, Surge Protection, Metal Case
Optically Isolated 7-Port USB Hub with SeaLATCH USB Ports - Sealevel
Optically Isolated 7-Port USB Hub - Sealevel
Amazon.com: Black Box USB to RS232 Opto-Isolated Converter : Electronics
USB Optically Isolated, industrial 4 Port Hub DIRECT
USB Isolator (Industrial) – CommFront
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
Opto-isolated 1500V 2Mbps USB to Serial Module (for Haasoscope) | eBay
Black Box SP390A-R3 Converter | Free Shipping
AZSMZ opto isolated USB MIDI Converter from AZSMZ on Tindie
USB Isolator for Protection of all types of USB devices
RS232 RS485 RS422 TTL USB Serial Fiber Optic Converters / Ethernet Data Converters
Optically Isolated 7-Port USB Hub - Sealevel
USB 8 Opto-Isolated Digital Inputs Module - Denkovi A E LTD