PC机与下位机的通信可以采用高级语言编程实现，如Delphi、VC等。Delphi 是新一代面向对象的可视化开发工具，它具有功能强大、简便易用和代码执行速度快等特点，越来越在构架企业信息系统方面发挥着重要作用。由于Delphi 这些显著特点，利用Delphi开发工业控制系统软件成为越来越多的开发人员的选择，而实现系统监测控制和信息处理的关键是解决PC机与单片机之间的串口通信问题。-PC computer and the communication of digital machines can be used to achieve high-level language programming, such as Delphi, VC, etc.. Delphi is a new generation of object-oriented visual development tool, it has a powerful, easy-to-use and fast code execution, etc., more and more in the framework of enterprise information system plays an important role. Delphi significantly because of these characteristics, the use of Delphi development of industrial control systems become more and more and more software developers choose to go to achieve control and information systems to monitor the key is to deal with machines with single-chip solution to PC serial communication problem between the.