4port RS232/422/485 PCI Express Communication Card w/Surge & Isolation PCI Express bus 2.0 compliant Speeds up to 921.6 kbps for extremely fast data transmission Supports any baud rate setting 4 x RS232 or RS 232/422/485 ports Operating systems supported: Windows 2000/XP/Vista/7, Linux 2.4/ 2.6/ 3.x.x, QNX6.5 and Vxworks XR17V354 UART with 256byte FIFOs