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Startech 3' USB to RS232 DB9/DB25 Serial Adapter Cable - Walmart.com
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USB to Serial adapter, USB to RS232 converter
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USB to RS232 Serial Converter -- DataPro
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USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
USB Serial RS232 Single Port PRO Adapter with Activity LED 3ft
USB Serial Adapter – Windows 10 Compatible High-Speed RS232 adapter
