ACCES I/O Products' family of isolated PCI Express serial communication cards feature a selection of four or two-ports of isolated, software selectable, RS-232, RS-422, and RS-485 serial protocols. The PCIe-ICM cards have a one-lane PCI Express connector, which can be used in 1, 2, 4, 8, 12, or 16 PCI Express expansion slots. Each RS-232 port supports data communication rates up to 921.6kbyte/s. The RS-422 and RS-485 modes support data communication speeds upto 3Mbit/s. Designed using type 16C950 UARTS, the cards use 128byte transmit and receive first in first out buffers to decrease CPU loading. The cards comply with PCI 16550 type UART applications and are suitable for factory automation, military and mission-critical, industrial on and off control, security systems, manufacturing test, and process monitoring applications.