The PCE-D9-04-CBL 4-Port DB9 Serial PCI Express Card adds four DB9 serial ports to your computer or server. By adding the PCE-D9-04-CBL to a computer with no DB9 ports or not enough of them, you can upgrade your DB9 capability without having to buy a new computer. Its single-chip design provides optimum reliability and speed, reducing your CPU's load from conventional bridge-chip cards and saving you money. Perfect for home or office, the PCE-D9-04-CBL supports data transfer rates up to 250 Kbps on each port with throughput up to 2.5 Gbps. It easily installs inside your computer in just a few minutes. The standard bracket's one-lane (x1) interface is compatible with x4, x8 and x16 PCIe slots. Connect the included DB9 breakout cable to the card's HD44 port, and allow the appropriate drivers to automatically install on your hard drive (a driver CD is included if they don't). The PCE-D9-04-CBL is fully compliant with PCI Express Revision 1.1 and compatible with industrial standard 16450/16550 UART. On-chip 256-byte depth FIFO in transmit and receive paths of each port. Supports hardware and software flow control; 5-, 6-, 7- and 8-bit serial formats; Even, Odd, None, Space and Mark parity; 1- or 2-stop bit operation; and re-map function for legacy ports.