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Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
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VCC-RS232-KIT: IP to RS-232 Command Converter - Atlona
USB to RS232 converter
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D-Module Plugs Adapter Assembly Audio Video 86 Panel RS232 Socket HDMI Network RJ11 Optical SUB
USB Serial - USB 2.0 RS232 Adapter with LED Indicators