Modbus串口通信功能设计

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1、摘要在机械、化工、纺织等行业，随着生产规模的不断扩大，以及对生产过程集中监控的迫切要求，现场总线技术应运而生，并成为了当今测控领域研究的热点之一。Modbus协议作为现场总线的一种，以其开发成本低，简单易用等诸多优点己被工业领域广泛接受。信号测量作为工业中重要的测量参数之一，本课题选择了信号测量作为测量的对象，并设计了基于Modbus协议的信号测量测控节点。本设计采用TC1047A传感器采集现场信号测量，由DSP320IF2407单片机进行AD转换和Modbus协议通讯。通讯的物理层采用RS485接口，并增加了光电隔离、抗雷击和短路保护等功能。最后实现

2、了单个节点和PC机的Modbus协议通讯，并通过控制蜂鸣器和继电器来模拟工业现场控制。本文分别从硬件和软件上阐述了该信号测量测控节点的实现方法。关键词信号测量测控Modbus协议RS485DSP320IF2407IABSTRACTWiththecontinuousexpansionofproductionscale,andtheurgentrequirementsincentralizedmonitoringoftheproductionprocessinmechanical,chemical,textileandotherindustries.Fie

3、ldbustechnologycameintobeing,andbecomeoneofhotresearchfieldofmeasurementandcontroltoday.Asoneoffieldbus,Modbusprotocolhavebeenwidelyacceptedbecauseoflowdevelopmentcost,easytouseandmanyotheradvantagesinindustry.Thetemperatureisoneoftheimportantparametersmeasuredinindustry,soithas

4、beenchosenameasurementoftheobject,temperaturemeasurementandcontrolnodeshasbeendesignedbasedonModbusprotocol.ThisdesignusesTC1047Asensortocollecton-sitetemperature,ADconversionandModbusprotocolcommunicationscanbedonebyDSP320IF2407microcontroller.Thephysicallayerofcommunicationado

5、ptsRS485interface,andhaveopticalisolation,anti-lightningandshortcircuitprotectioninaddition.Finally,achievedtheModbusprotocolcommunicationbetweenasinglenodeandthePC,andsimulateindustrialcontrolbycontrollingthebuzzer,andrelay.Thispaperdescribestheimplementationoftemperaturecontro

6、lnodefromhardwareandsoftware.KEYWORDSTemperatureMonitoringModbusprotocolRS485STC12C5A60II目录中文摘要...............................................................................................................................................Ⅰ英文摘要....................................

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