2 Serial Ports: The PCIE RS232 allows users to add two RS232 BD9 serial ports to desktop computers or industrial equipment via the PCI Express slot on the motherboard. PCIE X1 Interface: The full-height bracket on this expansion card is suitable for standard-sized computers, based on the PCIE X1 interface, and can operate in X1, X4, X8, or X16 slots. OS Support: Requires driver installation for Windows XP, Vista, 7, 8.x, 10, 11 (32/64 bit) systems. For Linux kernel 2.6.x, 3.x, 4.x, 5.x, refer to compiled source code. Supports 256 Byte Deep FIFO: The PCIe serial expansion card utilizes the ASIX AX99100 program, supporting 256-byte deep FIFO transfers on-chip. Suitable for Intel and ARM hardware platforms. Applications: The 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. We offer not only high-quality products but also long-term customer service. When you purchase our products, you receive comprehensive support even after the sale, allowing you to shop with confidence and satisfaction.