SIIG’s 4-Port RS-232 Serial PCI with 16550 UART adapter card is designed to add four 9-pin RS-232 serial ports to your PCI enabled desktop computer. This serial adapter comes with four high-speed 16550 UART serial ports with 256-byte FIFO buffer to deliver data transfer rates up to 230Kb/s. The 4-Port RS-232 Serial PCI with 16550 UART is the smart and cost effective solution to add 4 RS-232 serial ports for additional serial port device connections.