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6FT RS232 DB9 9Pin Female to USB 2.0 A Male Serial Cable Adapter Converter Cord | eBay
3ft USB to Serial Cable/RS232 Adapter - シリアルカード & アダプタ | StarTech.com 日本
USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com Europe
StarTech.com USB to Serial Adapter - 3 ft / 1m - with DB9 to DB25 Pin Adapter - Prolific PL-2303 - USB to RS232 Adapter Cable - DB-9 Male Serial - Type
Amazon.com: StarTech.com 3ft (1m) USB to Serial Cable, DB9/DB25 RS232 to USB Converter, Prolific, USB to Serial Adapter for PLC/Printer/Scanner/Switch, USB to COM Port Adapter, Windows/Mac/Linux (ICUSB232DB25) : Electronics
3-Pin Header-to-DB-9 Serial RS-232 Interface Cable (6351) | Technobox