在煤矿系统中,各个采集监控设备之间都采用CAN总线进行相互传输数据,针对这一问题,设计定制的一款通讯板卡；由于设计小型化的要求,故采用PC104+的总线结构,该通讯卡含有2路CAN总线通信通道,PC104+总线目标接口芯片采用PLX 9030;SJA1000作为CAN控制器,82C250作为CAN收发器;在2路CAN通信通道上均采用光电隔离技术,增强系统在恶劣环境中使用的可靠性；在此基础上编写了驱动程序；该通讯板卡交付验收后,通过实际测试,当CAN总线工作在1M波特率的情况下,电缆长度在40米的情况下,CAN总线收发数据正确;整个系统运行稳定,可靠性高.%Each acquisition and monitoring device transfer data between CAN bus in the coal mine system, in view of this question, a communication board is designed. As the demand of miniaturization, the communication board adopts PC104 plus bus structure , includes dual CAN bus communication channels, Adopts PLX 9030 as PC104 plus bus target interface chip, Adopts SJA1000 as the CAN controller, and 82C250 as the CAN transceiver. Moreover, the communication board adopts photoelectric isolation technology on the channels to improve the system reliability under bad conditions. On this foundation, the device driver is compiled. After acceptance, through practical testing, when CAN bus to work in 1M baud rate and the cable in 40 metres. CAN bus Receive and transmit data correctly. The whole system runs stability and reliability.
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