分析了DeviceNet物理层(包括供电电源、电气隔离、CAN收发器、连接器、指示灯等)设计中的重点部分与常见谬误。重点介绍了物理层一致性测试的主要测试项目,包括阻抗/电容、网络供电电压、总线电压、位时间、ACK延时、误接线等,以期为国内DeviceNet设备的开发和标准化提供参考。
This paper analyzed the key points and common mistakes in designing DeviceNet physical layer such as power supply,electric isolation, CAN transceiver, indicator light and introduced the major items of physical layer conformance test, including impedance/capacitance, network power supply voltage, line voltage, bit time, ACK delay, wrong connection so as to provide references for the development and standardization of domestic DeviceNet devices.