张青 任宏

摘 要： 针对当前智能人机交互通信系统存在的通信稳定性和安全性差、延迟大的问题，提出并设计基于RS 232的智能人机交互通信系统。该系统主要由登录与退出单元、通信数据传输单元和通信数据信息加密单元等模块组成，系统运行时下位机向上位机传输通信指令，下位机向上位机发送实时数据信息。上位机利用接收线程完成数据信息的处理，系统上位机向下位机传输反馈控制，同时请求下位机对人机交互设备进行调整。在登录与退出单元中，当客户端启动系统，出现登录界面后，立即输入用户名称及密码完成登录，并随即进入通信程序。在通信数据传输单元中，依据发送端的地址找到与之相应的对话框，在对话框中显示出对应消息，同时在显示消息中设定接收选择。在通信数据加密单元中，利用DES_ncbc_encryp加密和解密函数完成通信数据加密。实验表明，该系统运行稳定性和安全性均优于当前系统，并具有延迟低的优点，可行性高，实用性和适用性均较强。

关键词： 人机交互； 通信指令； 系统设计； 加密； 数据传输； RS 232

中图分类号： TN915.5?34； TP827 文献标识码： A 文章编号： 1004?373X（2018）20?0175?04

Abstract： As the current intelligent human?computer interaction communication system has the problems of poor stability， security and large delays in communication， an intelligent human?machine interactive communication system based on RS 232 is proposed and designed. The system is mainly composed of the login and logout unit， communication data transmission unit， and communication data information encryption unit. During the system operation， the lower computer sends communication instructions to the upper computer， and the lower computer sends real?time data information to the upper computer. The upper computer uses the receiving thread to complete the processing of data information. The system upper computer transmits the feedback control to the lower computer and simultaneously requests the lower computer to adjust the human?computer interaction device. In the login and logout unit， when the system is started on the client and the login interface appears， the user name and password should be immediately entered to complete the login and enter the communication program immediately. In the communication data transmission unit， the corresponding dialog box is found according to the address of the transmitting terminal， the corresponding messages are displayed in the dialog box， and the receiving selection of displayed messages is set. In the communication data encryption unit， the communication data encryption is accomplished by using the DES_ncbc_encryp encryption and decryption function. The experimental results show that the system is superior to the current system in operation stability and security， and has the advantages of low delay， high feasibility， strong practicality and applicability.

Keywords： human?computer interaction； communication instruction； system design； encryption； data transmission； RS 232

0 引 言

智能人机交互即时通信是互联网应用的重要研究方向，针对它的研究已经受到了业界的高度重视[1?3]。人机交互即时通信系统组建了一个能够在线进行实时沟通的平台，得到了广大用户的广泛使用。左韬等人提出并设计基于以太网EtherCAT的人机交互通信系统[4]。对以太网通信总线网络延时进行分析，通过最小二乘法与支持向量机的有效结合，实现网络延迟的在线测试。……