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The EX-1303 USB 1.1 to Serial RS-422/485 cable provides one high performance 16C550-type UART compatible RS-422/485 serial port. It is designed for PC, thin client or server to provide instant COM port expansion with a cable through the USB 1.1 or 2.0 Bus. With the easy installation you don t need to open the computer system and install the EX-1303 when the system run.