Remote data acquisition and transmission is mainly dependent on public wired or wireless networks,while data exchange and remote control is easy to leak information,and is not conducive to the effective protection of important data.Targeted at the shortcomings of long distance data transmission difficulties and to realize the aim of private line telecommunication,this research puts forward interface circuit design,calibration algorithm and application program design interface circuit using 73K222AU modem,HR219307 transformer and AT89S52 singlechip,which can effectively solve the problems of remote data transmission and control;Using CRC cyclic Redundancy Check Algorithm and Parity Check Algorithm to simplify the operation and effectively solves the transmission error,and program design uses C51 language which has a clear structure,and has the ability to assemble the language of the hardware.The experimental results show that the proposed scheme has the advantages of long data transmission distance,high reliability,convenient communication network,strong adaptability to environment,and can realize private data communication network outdoors.%远距离数据采集与传输主要依赖于公共有线或无线网络,数据交换和远程控制容易泄露信息,不利于重要数据有效保护;为了实现专用线路远程通信,有效解决长距离数据传输困难,提出基于调制解调器73K222AU芯片与单片机AT89S52、变压器HR219307的硬件电路和接口电路设计方法,达到数据和信号远程交换;通信校验采用CRC循环冗余码校验算法与奇偶校验算法,不仅简化了运算,同时有效解决传输误码影响;程序设计采用结构清晰的C51语言,还具有汇编语言的硬件操作能力;实验结果显示,采用73K222AU芯片设计的电路,能够实现单片机远程通信,数据传输距离远、可靠性高、通信组网方便、环境适应能力强,满足野外专用数据通信组网.
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