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StarTech.com 8 Port Serial Hub USB to RS232/RS485/RS422 Adapter, Industrial USB 2.0 to DB9 Serial Converter Hub, IP30 Rated, Din Rail Mountable Metal Serial Hub, 15kV ESD Protection - 6ft Locking Cable
RS232 to 422/485 Serial Converter w/ ESD - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com Europe
RS232 to RS485
USB To RS485 Adapter, Adapter Cable Compatible With RS232 RS485 RS422 Standards USB To RS485 Converter, For Data Transmission - Walmart.com
Amazon.com: DTECH RS232 to RS485 Converter Serial Adapter with 4 Position Terminal Block for Long Haul Data Communication Supports 600W Anti-Surge : Electronics
RS232 to RS485 adapter - LightObject | Professional Laser Cutters and Engravers Solutions