The USB 1.1 to RS-232 cable provides one high performance 16C550-type UART compatible RS-232 serial port with 15KV surge protection and 2.5KV optical isolation. It is designed for PC, thin client or server to provide instant COM port expansion via 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-1302 when the system run.