Add 2 high-speed RS-232 serial ports to your low profile/small form factor computer with a PCI Express expansion slot. One high speed RS232 serial port with a data transfer rate up to 460.8 Kb/s. Ships with half-height/low profile mounting bracket, includes optional standard profile bracket. Single chip design optimises speed and reliability - Native single-chip, single-lane PCI Express - Selectable power output on pin 9 for the serial port - Compliant with PCI Express base specifications revision 1.1a - Automated out-of-band hardware flow control using CTS / RTS and/or DSR / DTR - Automated in-band software flow control using programmable Xon/Xoff in both directions - 128-byte FIFO per transmitter and receiver