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USB to serial RS232 adapter with two ports
Configuring a USB-to-Serial Converter
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USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | StarTech.com
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USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter - Sabrent
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USB to RS232 Adapter / Converter – CommFront
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USB to RS232 Serial for Vista -- DataPro
USB 2.0 to 9-pin RS232 COM Port Serial Convert Adapter | eBay
3ft USB to Serial Cable/RS232 Adapter - Serial Cards & Adapters | StarTech.com
6ft (1.8m) USB to DB25 Serial RS232 Adapter Cable | Adapters and Couplers | Audio Video
USB to DB9-Male Serial Port Adapter Prolific Chipset 1FT GXMU-1201 with LED | eBay
