基于MODBUS协议的通讯系统【摘要】本设计研究如何通过MODBUS通讯协议，设计利用单片机，结合NRF24L01无线收发芯片，实现了温度实时采集与主机（PC机）显示。用STC89C52单片机与DS18B20对温度采集显示于数码管，在通过无线模块发送到另一块单片机系统里通过1602液晶显示，成后，基于MODBUS通讯协议通过RS-485的物理层实现串口通信，发送实时数据给主机。经过一系列的处理后，温度得以实时在两个单片机系统中显示并准确显示在主机串口调试软件中。经检测，作品实现了基于MODBUS协议的通讯。【关键词】MODBUSNRF24L01STC89C52PC机[Abstract]ThisdesigntostudyhowthroughtheMODBUScommunicationprotocoldesignedtousemicrocontroller,tocombineNRF24L01wirelesstransceiverchiptemperaturereal-timeacquisitionwiththehost(PC)display.TheSTC89C52SCMandDS18B20temperatureacquisitionanddisplaydigitalcontrol,the1602LCD,afterthecompletionofamicrocontrollersystemviaRS-485physicallayercommunicationprotocolbasedonMODBUSserialcommunicationthroughawirelessmoduletosendtosendreal-timedatatothehost.Afteraseriesoftreatments,thetemperaturecanbeshowninthetwosingle-chipsysteminrealtimeandaccuratelydisplayedonthehostserialportdebuggingsoftware.Aftertesting,theworksbasedonMODBUSprotocolcommunication.[Keywords]TheMODBUSnRF24L01STC89C52hostcomputer目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc321054997"第１章绪论PAGEREF_Toc321054997\h1HYPERLINK\l"_Toc321054998"1.1Modbus协议简介PAGEREF_Toc321054998\h1HYPERLINK\l"_Toc321054999"1.2Modbus协议的应用PAGEREF_Toc321054999\h1HYPERLINK\l"_Toc321055000"1.3、本论文的主要内容PAGEREF_Toc321055000\h1HYPERLINK\l"_Toc321055001"第２章设计总思路和法案选择PAGEREF_Toc321055001\h2HYPERLINK\l"_Toc321055002"2．1、设计总体思路基本原理和框图PAGEREF_Toc321055002\h2HYPERLINK\l"_Toc321055003"2.2MODBUS方案选择PAGEREF_Toc321055003\h2HYPERLINK\l"_Toc321055004"2.3通讯接口选择PAGEREF_Toc321055004\h3HYPERLINK\l"_Toc321055005"2.4无线模块的选择PAGEREF_Toc321055005\h4HYPERLINK\l"_Toc321055006"2.5本章小结PAGEREF_Toc321055006\h4HYPERLINK\l"_Toc321055007"第３章通讯系统实现的理论原理PAGEREF_Toc321055007\h5HYPERLINK\l"_Toc321055008"３.1MODBUS-RTU通讯协议内容简介PAGEREF_Toc321055008\h5HYPERLINK\l"_Toc321055009"3.2RS-485接口简介PAGEREF_Toc321055009\h7HYPERLINK\l"_Toc321055010"3.3NRF24L01无线模块内容简介PAGEREF_Toc321055010\h