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Opto-Isolated RS232/RS485/RS422(4-Wire) 4-Port Hub / Splitter (Industr – CommFront
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Industrial USB 8 Port Serial RS-232 adapter w/FTDI Chipset, COM Retention, RX/TX LED Indicators, DIN Rail Mount Bracket, & Surface Mounting Brackets
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Shop | StarTech.com 4 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
1pcs Used MOXA UPort 1410 USB to 4 serial port hub RS232 | eBay
StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
