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FTDI Serial TTL-232 USB Cable : ID 70 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB to Serial RS-232 DB9 FTDI Mini Adapter with Extension Cable
Amazon.com: Adaptador USB a Serial USB a RS232 DB9 (9 pines) a COM Puerto Convertidor Cable USB Serial Soporta Windows 10 8 7 y Mac Linux : Electrónica
3ft USB to Serial Cable/RS232 Adapter - Serial Cards & Adapters | StarTech.com
Startech 3' USB to RS232 DB9/DB25 Serial Adapter Cable - Walmart.com
USB to DB9-232/485 Serial to USB Converter Cable – Alicat Scientific
USB to TTL Serial Cable - CAB-12977 - SparkFun Electronics
Amazon.com: Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux (RS-232DB9 DTE Male Connector, Prolific PL2303HX Rev. D Chipset) : Electronics
USB 2.0 To Serial DB9 Male (9 Pin) RS232 Cable Adapter - Sabrent
PRO Single Port USB to Serial Adapter with Activity LED 3ft.