2-Port PCIe Serial Card features on-board DIP switches allowing each DB9 serial port to operate in RS-232/RS-422/RS-485 independently - On-board jumpers provide the option of 12V or 5V at 1.5A or the option for no power (RI); Each port can be configured individually - Standard profile bracket pre-installed with two low-profile brackets included - 16C450/16C550/16C650/16C750/16C950 UART compatible - AX99100 Chipset - Supports Windows/Linux - Max Baud Rate: 921.6Kbps; 256 Byte FIFO