用Visual C＋＋实现PC与PLC之间的串行通讯

在工业控制中，常常需要对PLC的采集数据和工作状态进行监测控制，实现的方式有VB、DELPHI、PB等．Visual C＋＋是一种Windows应用程序开发工具，在图形处理和数据库管理等方面具有较强的功能，用它来实现底层的通信控制有着更快的速度，采用Visual C＋＋和MFC实现实时要求较高的小型控制系统中的PC和PLC的串行通讯系统，给出了系统的通讯原理和软件设计方法，实现数据的快速发送和接收，实时自动控制准确、快速。该系统简单、经济、稳定、实用性强并已成功应用于实际系统中。

Serial Communication System Between PC and PLC Based on Visual C++

It is usually need to supervise and control gathering data and working status of PLC in industry control.There are some ways such as VB,DELPHI,PB to carry out the requirement.Visual C++ is an exploiture tool for Windows application program and has quite strong function in the aspect of image processing and database managing etc.It has faster speed to realize bottom communication control.Using Visual C++ and MFC,the authors implement the serial communication system between PC and PLC.The paper introduces the communication protocol and software design method and realizes data's sending and incepted rapidly,real-time auto-control accurately and quickly.This system is simple,economical,and reliable and has an application value,which has been applied successfully in real system.