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This 3 Feet USB to Serial DB9 Female adapter cable adopts premium Prolific PL2303 chip, perfectly converting USB 2.0 port to standard RS232C DB9 9 Pin 2 Row serial interface. It supports high-speed serial data transmission and ensures stable connection for long-term use. Fully compatible with Windows 11, 10, 8, 7, Mac and Linux operating systems, no complicated driver setup required in most cases. USB bus powered design eliminates the need for external power supply. Ideal for connecting industrial PLC, CNC machine, POS cash register, barcode scanner, label printer, network switch and all legacy RS232 serial devices, perfect for industrial control, device debugging and serial data communication.