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Amazon.com: NEW - ADD 2 RS-232 SERIAL PORTS TO YOUR STANDARD OR SMALL FORM FACTOR COMPUTER THROUGH - PEX2S553 : Electronics
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Amazon.com: 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
Amazon.com: Coolgear Professional Quad Port USB to Serial DB-9 RS-232 Adapter : Electronics
Amazon.com: Lantronix Device Server EDS 4100 - Device server - 4 ports - 10Mb LAN, 100Mb LAN, RS-232 : Electronics
Amazon.com: Brainboxes Device Server - 2 Ports - 10MB LAN, 100MB LAN, RS-232 (ES-457) : Electronics
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Amazon.com: Black Box USB-C to DB9 Adapter - 5-ft. (1.5-m) : Electronics
