The PCI Express RS232 Multi-Port I/O card is used EXAR’s high performance chipset 17V358,it is compliant to PCIe 2.0 Gen 1(2.5GT/s),and it has eight serial port each port has many enhanced features such as the 256-bytes TX and RX FIFOs, Programmable Fractional Baud Rate Generator, Automatic Hardware or Software Flow control, it is complete to used for Point-of-Sale systems, Remote Access Servers, and factory Automation etc.