The CAN (Controller Area Network) is a serial communication protocol, which efficiently supports distributed real-time control with a very high level of security. It is especially suited for networking "intelligent" devices as well as sensors and actuators within a system or sub-system. In CAN networks, there is no addressing of subscribers or stations in the conventional sense, but instead prioritized messages are transmitted. As a standalone CAN controller, PIO-CAN400/CAN200 represents an economic solution within which an active CAN board can have either two or four independent CAN bus communication ports with either a 5-pin screw terminal connector or a 9-pin D-sub connector. It can be used as master/slave function to cover a wide range of CAN applications. In addition, the PIO-CAN400/CAN200 uses the new Phillips SJA1000T and transceiver 82C250/251, which provide for bus arbitration and error detection with both an auto correction and re-transmission function. It can be installed in a 5V 32-bit PCI slot and is supported with actual “Plug & Play” technology.