RS232 serial to USB converter cable schematic · AllPinouts
CH3330N - Small and Cheap USB-Serial Converter IC Needs No Crystal - Electronics-Lab.com
StarTech.com USB to Serial RS232 Adapter Cable with COM Retention 1'
USB to RS232 converter
StarTech.com 3ft (1m) USB to Serial Cable, DB9 Male RS232 to USB Converter, USB to Serial Adapter, COM Port Adapter with Prolific IC, 1 (Quantity) - Walmart.com
Amazon.com: StarTech.com 3ft (1m) USB to Serial Cable, DB9 Male RS232 to USB Converter, Prolific IC, USB to Serial Adapter for PLC/Printer/Scanner/Switch, USB to COM Port Adapter, Windows/Mac (1P3FP-USB- SERIAL) : Electronics