单片机串行通讯技术在数据采集系统中的应用  

The Application of the Serial Interface CommunicationTeachni que of One-chip Machines in the System of Collecting Experimental Data

作　　者：余国卫[1] 陈俊生[1] 张丽平[1] 王向磊[1] 

机构地区：[1]沈阳理工大学信息科学与工程学院,沈阳110168

出　　处：《微处理机》2005年第4期94-96,共3页Microprocessors

摘　　要：能够完成异步通信的硬件电路称为UART,即通用异步接收器/发送器(Universal A-synchronous Receiver/Transm itter),本文介绍了应用8051单片机一主机多从机组成的串行异步通讯接口技术进行数据采集,采用RS—485标准接口通信,其抗干扰能力强,可与32台从机通讯,传输距离可达1200m,最大传送速率1Mb/S。The hardware circuit which can fulfill the task of asynchronous communication is called UART, which means Universal Asynchronous ReceiveI/Transmitter. Experimental data can be collected precisely if the serial Asynchronous communication imerface technique of 8051 one - chip machine is properly used. The 8051 one - chip machine is composed of one principal machine and many subordinate machines. If the interface up to RS -485 standards is used to communicate, the ability to resist interference is strong. It can be applied to the communication of 32 subordinate machines. The transmittingdistance can reach 1200m. The maximum transmitting rate can reach 1Mb/S.

关 键 词：异步通信 多机通信 RS-485 主机 从机 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]