针对这一问题，提出了利用可编程计算机控制器(PCC)控制磁滞测功机实现串行通信加载的方法，并设计了一新型负载特性模拟实验系统。

Aimed at this problem, a method of serial communication loading on HAD which is controlled by PCC (programmable computer controller) was proposed, and a novel experimental system was designed.

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详细介绍了在自由口模式下S7 - 200 PLC与计算机实现串行通信的方法，重点介绍了通信协议及其实现方法，并给出了编程实例。

How to implement serial communication between S7-200 PLC and computer based on free port mode was described in detail in the paper.

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此外，还利用单片机的串行通信模块，设计了与计算机通信的串行接口，并给出了系统的硬件电路图和软件流程图。

In addition, the communication with MCU and computer is realized by the serial communication port. The system's hardware schematics and software flow chart are also discussed in this paper.

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