SUNIX IPC-E2204S, Industrial 4-port RS-422/485 with Surge PCI-Express Serial Card, allows users to expand four RS-422/485 ports on PC-based system. Each serial port achieves data rates up to 921.6 Kbps and utilizes 16C950 UART with an on-chip 128-bytes hardware FIFO buffer for reliable, high-speed serial I/O.