4-port RS-232/422/485 PCI Express Communication Card w/Surge & Isolation_x000D_ PCI Express bus 2.0 compliant_x000D_ Speeds up to 921.6 kbps for extremely fast data transmission_x000D_ Supports any baud rate setting_x000D_ 4 x RS-232 or RS- 232/422/485 ports_x000D_ Operating systems supported: Windows 2000/XP/Vista/7, Linux 2.4/ 2.6/ 3.x.x, QNX6.5 and Vxworks_x000D_ XR17V354 UART with 256-byte FIFOs