The CAN (Controller Area Network) is a serial communication protocol, and efficiently supports distributed real-time control with a very high level of security. It is an especially suit 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 standalone CAN controller, PISO-CAN100U-D can represent an economic solution of an active CAN board. It has one CAN bus communication port with 9-pin D-sub connector, and has the ability to cover a wide range of CAN applications. Besides, PISO-CAN100U-D uses the new CAN controller Phillips SJA1000T and transceiver 82C250, which provide bus arbitration, error detection with auto correction and re-transmission function. It can be installed in a 5V PCI slot and supported truly “Plug & play”.