试析单片机与PLC 之间的串行通信实现

本文首先对单片机和PLC的基本含义进行简要阐述；其次从接口电路设计、RS—232C串行通信接口的设置、通信协议设计三个方面入手，对单片机与PLC串行口通信接口电路及设置进行探究；然后从发送命令帧格式、响应帧格式两方面，提出单片机与PLC串行口的通信过程，提出单片机与PLC 的应用措施。

The Realization of Serial Communication Between SCM and PLC

This paper describes the SCM and PLC briefly; and then explores on the serial communication interface circuit betweenSCM and PLC from three aspects which are the interface circuit design, setup of the RS - 232 c serial communication interfaceand communication protocol design. From the sending command frame format and the responsing frame format, it proposes theserial communication process between SCM and PLC, and proposes their application.