PCM9880是一块PC/104界面的双端口隔离CAN总线通讯卡，它提供PC与控制器局域网之间的连接。采用高性能的SJA1000控制器和82C250收发器，每个端口工作的波特率可达1Mbps。内置CAN控制器具有总线仲裁和带错误侦测自动重复传输功能，有效的避免了数据丢失，确保了系统的稳定。端口采用直接存储地址映射，加快CAN控制器访问速度。两个板载控制器对应不同的内存地址，应此两路控制器可以同时独立工作。卡上还有光电隔离器，能保护PC和设备免受接地回路的破坏，大大增强了系统在恶劣环境下的可靠性。-PCM9880 is a PC/104 interface of the dual-port isolation CAN communication card, which provides PC and LAN controller between connections. The high-performance controller and transceiver SJA1000 transceivers, each port baud rate of up to 1Mbps. CAN controller with built-bus arbitration and error detection with automatic transmission repeat function effectively avoided the loss of data, ensure the stability of the system. Port direct memory address mapping, accelerate CAN controller speed access. Two board controller dealing with different memory address, this two-way controller can also work independently. Also on the card photoelectric isolators, and the PC can protect equipment from damage grounding circuit, greatly enhancing the system in the harsh environment of reliability.