4-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 - Two Standard Profile Brackets Pre-Installed With Four Low-Profile Brackets Included - 16C450/16C550/16C650/16C750/16C950 Uart Compatible - Ax99100 Chipset - Supports Windows/Linux - Max Baud Rate: 921.6Kbps; 256 Byte Fifo