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针对工业色谱仪测控系统中的数据采集与控制,以嵌入式单片机ATmega128为MCU实现CAN总线与上位机的通信.介绍了RS485的接口芯片SN75LBC184P,CAN总线、RS485通信协议,重点介绍了CAN-RS485协议转换器的硬件电路设计与软件设计的方法.
Aiming at the data acquisition and control in the industrial chromatograph measurement and control system, the embedded microcontroller ATmega128 is used to realize the communication between CAN bus and host computer.An introduction of the RS485 interface chip SN75LBC184P, CAN bus and RS485 communication protocol is given, and the CAN-RS485 Protocol converter hardware circuit design and software design methods.