本文介绍了一种基于Internet在PC上实现的一个远程故障诊断系统的前端。前端由前端计算机和以AT89C52单片机为核心设计的智能数据采集卡组成。使用了由AT命令集控制的MODEM调制解调技术，通过公用电话网，实现实时远程数据采集、处理及管理功能。关键词：远程故障诊断 前端 InternetAbstract： In this paper, a front terminal based on the Internet and PC is introduced. The front terminal consists of a local computer and a intelligent data acquiring card designed on microcomputer AT89C52.the system, with the techniques of modem controlled by AT orders, can acquire and manage data from remote spots in real time via public telephone network.Key words：Remote fault diagnosis Front terminal Internet