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远方终端单元（RTU）是分布式计算机监控系统的重要组成部分，在监控系统中主要完成现场数据的采集、处理和控制输出，其与控制中心或上位机的联系多以串行通讯的方式实现．随着生产过程的日益复杂化，监控系统中传统的应答式通讯方式已不能满足对生产过程的实时监控要求，因此
The remote terminal unit (RTU) is an important part of the distributed computer monitoring system. The monitoring system mainly collects, processes and controls the on-site data. The communication with the control center or host computer is realized by serial communication . With the increasingly complicated production process, the traditional answering communication system in the monitoring system can no longer meet the real-time monitoring requirements of the production process, therefore