CE, TAA Complient. Opto-Isolated 4xRS422/485 Serial Board. 4 serial RS422/485 port PCI Express x1, x4, x8 ; x16 lane slots socket size 128 Byte Tx and 128 Byte Rx FIFOs Up to 921,600 Baud DB9 connector (9 Pin Male) Drivers for all popular operating systems