USB Serial RS232 Single Port PRO Adapter with Activity LED 3ft
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USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters | StarTech.com
4-Port RS-232 USB to Serial Adapter Data Control Box - Coolgear
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USB to serial RS232 adapter with two ports
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Serial Ethernet Converter (RS232, RS485, RS422) Industrial Panel Mount, 2 Ports - Pro [USC-HF5122] - $149.00 : Serial Data Communication by U.S. Converters LLC
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1 Port USB to RS232 DB9 Serial Adapter - Serial Cards & Adapters | StarTech.com
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4 Port Professional RS-232 USB 2.0 to Serial Adapter
2-Port RS232 Serial PCIe with 16950 UART
