Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
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USB to Serial adapter for the FLEX-6000 series – FlexRadio
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FTDI USB-to-Single Port Serial Adapter (USB1PFTDI) - Astro-Physics
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StarTech.com 1 Port USB to RS232 DB9 Serial Adapter Cable - M/M - ICUSB232V2 - Serial Cables - CDW.com
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USB : USB to RS232 Serial DB9 Male Cable Adapter FTDI Chipset 10 Feet RPC- USB-RS232-3M by www.valley-ent.com
USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | StarTech.com
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PRO Single Port USB to Serial Adapter with Activity LED 3ft.