The ATEN™ UC485 is a high quality industrial adapter cable designed to instantly add an RS-422/485 port to your PC or laptop via a USB port. The adapter is powered via the USB connection without needing an external power supply. Fast COM Port Transmission – up to 921.6 Kbps. Package included DB-9 female to terminal block adapter for easy wiring. Supports Terminal / ECHO mode by mode selector.