SP385A-R3, USB to RS232 Opto-Isolated Converter - Black Box
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USB to RS485 | RS422 Optically Isolated Industrial Serial Adapter
Industrial USB-A 5KV Optical Isolation Adapter Din Rail - Shentek
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USB TO RS422/RS485 ADAPTERS W/OPTICAL ISOLATION (FULL SPEED) — Connective Peripherals - Global Store
USB to Serial Adapter Cable w/ Isolation - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com France (en)
Ftdi USB-RS232-We-1800-Bt with Optical Isolated, Ftdi USB RS232 Cable - China USB to RS232 Converter Cable 1.0 Meter and USB to RS232 Ftdi price | Made-in-China.com
Optically Isolated USB to Serial Port 5V3.3V2.5V1.8V Optically Isolated USB to TTL Serial Port CH340 UART - AliExpress
Optically isolated USB to RS485/422/232 interface industrial grade lightning protection USB to serial converter - AliExpress
StarTech.com ICUSB2321FIS USB to Serial Adapter - Optical Isolation - USB Powered - FTDI USB to Serial Adapter - USB to RS232 Adapter Cable - Walmart.com
Optically Isolated USB to Serial Port 5V3.3V2.5V1.8V Optically Isolated USB to TTL Serial Port CH340 UART - AliExpress
Optically Isolated 7-Port USB Hub - Sealevel
StarTech.com ICUSB2321FIS USB to Serial Adapter - Optical Isolation - USB Powered - FTDI USB to Serial Adapter - USB to RS232 Adapter Cable - Newegg.com
4 Port RS-232 USB to Serial Adapter w/ Optical Isolation & Surge Protection - Coolgear