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A USB to Serial Cable is a converter cable that enables communication between devices with a USB port (such as a computer or laptop) and serial devices (such as older PLCs, industrial equipment, or certain sensors) that use RS-232, RS-485, or TTL serial communication.

This cable typically features a USB connector on one end and a serial connector (DB9, DB25, or terminal block) on the other. It is commonly used when connecting modern computers to legacy serial devices, offering a simple and cost-effective solution for data transmission or device programming in industrial, automation, and networking applications.