1、2 SERIAL PORTS: PCIE RS232 allows users to add two RS232 BD9 serial ports to desktop computers or industrial equipment through the PCI Express slot on the motherboard. 2、PCIE X1 INTERFACE: The full size bracket on this expansion card is suitable for standard size PCs, based on PCIE X1 interface, and can work in X1, X4, X8, X16 slots. 3、SUPPORT OS: Requires driver installation on for Windows XP, for Vista, 7, 8.x, 10, 11 (32/64 bit) systems. for Linux kernel 2.6.x, 3.x, 4.x, 5.x requires reference to compiled source code. 4、SUPPORTS 256 BYTE DEPTH: The PCIe serial expansion card selects the for ASIX AX99100 program, which supports on chip 256 byte depth FIFO transfers. Suitable for for Intel, for ARM hardware platforms. 5、APPLICATIONS: PCIE serial DB9 port card seamlessly connects POS systems, industrial measurement and control devices, security systems, logistics management devices, scanners, printers and other serial DB9 port devices.