DGIOT国内首家轻量级物联网开源平台——真实ModbusRTU接入实战教程

[小 迪 导读]：
本教程在掌握基础modbusRTU标准协议概念和业务流程之后，通过真实的支持ModbusRTU标准协议的设备和DTU来进行实战演练。

系统需要使用两个设备以及若干导线：

• 温湿度传感器：采用的是SHT20传感器 Modbus工业级
• DTU：采用的是有人的口红CAT-1 DTU DR154

系统架构逻辑图如下，包括设备模拟，通道通信，模型设置，应用显示部分

操作步骤：

1.设备接线

电表信息

模块	温湿度变送器
型号	SHT20传感器
类型	Modbus 工业级 高精度 温湿度监测

• SHT20传感器

DTU信息

品牌	有人
型号	DR154（RS485）
密码（Pwd）	usr_cn

• dtu图片

操作步骤

SHT20传感器连接电源

SHT20传感器根据端口图正负连接电源正负，电源可以选用电源适配器。

DTU连接电源

根据DTU上的端口图,红色线(电源线)连接DC+,黑色线(地线)连接DC-

连接DTU和SHT20传感器

根据端口图,SHT20传感器的A端口连接DTU端口的RX(A),SHT20传感器的B端口连接DTU端口的TX(B)

说明 RX为接收,TX为发送

2.dtu配置

1.DTU正面二维码下方标识正负极连接电源，A,B端连接电表，到开手机微信扫码，扫描DTU二维码进入小程序，打开蓝牙连接与DTU背部IMEI相同编号的蓝牙，进入连接，密码为usr_cn。

2.打开参数设置，设置工作模式：地址设为部署的平台地址；端口号设为20111。

说明 地址为服务器地址，端口号为服务器端口号，若无自己的物联网服务器，可选择地址:prod.dgiotcloud.cn，端口号设为20111
警告 设置dtu时，工作模式设置完后需保存再设置串口，不能一次性设置，一次性设置会导致设置不完全

勾选注册包功能，注册包数据类型选择IMEI码，将会自动生成一个IMEI码。

3.打开参数设置，设置串口设置：波特率设为9600，校验位选择NONE。

说明 支持ModbusRTU的设备：参数可以询问商家或者商品介绍获取设备的参数


3.创建采集通道

1.创建ModbusRTU采集通道。位置在通道管理-创建通道

2.选择Modbus采集通道并配置

3.产品添加通道后需对通道进行重启

4.通道日志查看

5.创建产品

1.要连接ModbusRTU，创建一种产品即可
2.创建产品

ModbusRTU

3.产品物模型配置
将以下物模型代码直接复制即可
ModbusRTU

{"events": [],"properties": [{"accessMode": "r","dataForm": {"address": "0X10","afn": "","byteType": "","bytelen": "","collection": "%%humid/10","control": "%d","countcollection": "%s","countround": "all","countstrategy": 20,"da": "","data": "null","dt": "","iscount": "0","offset": 0,"operatetype": "readCoils","order": 0,"originaltype": "short16_AB","protocol": "MODBUSRTU","rate": 1,"round": "all","slaveid": "0X10","strategy": "计算值"},"dataSource": {"": [],"_dlinkindex": "","address": "1","dis": [{"data": "2","key": "0000","undefined": "0000"}],"operatetype": "readIregs","originaltype": "short16_AB","registersnumber": "1","slaveid": "temp_humid"},"dataType": {"das": [],"specs": {"max": 100,"min": 0,"precision": 3,"step": 0,"unit": "%"},"type": "float"},"devicetype": "温湿度传感器","identifier": "humid","index": 0,"isaccumulate": false,"isshow": true,"isstorage": true,"moduleType": "properties","name": "湿度","required": true,"updateAt": "1659081134998"},{"accessMode": "r","dataForm": {"address": "0X10","afn": "","byteType": "","bytelen": "","collection": "%%temp/10","control": "%d","countcollection": "%s","countround": "all","countstrategy": 20,"da": "","data": "null","dt": "","iscount": "0","offset": 0,"operatetype": "readCoils","order": 0,"originaltype": "short16_AB","protocol": "MODBUSRTU","rate": 1,"round": "all","slaveid": "0X10","strategy": "计算值"},"dataSource": {"": [],"_dlinkindex": "","address": "0","dis": [{"data": "2","key": "0000","undefined": "0000"}],"operatetype": "readIregs","originaltype": "short16_AB","registersnumber": "1","slaveid": "temp_humid"},"dataType": {"das": [],"specs": {"max": 100,"min": -100,"precision": 3,"step": 0,"unit": "℃"},"type": "float"},"devicetype": "温湿度传感器","identifier": "temp","index": 1,"isaccumulate": false,"isshow": true,"isstorage": true,"moduleType": "properties","name": "温度","required": true,"updateAt": "1659081126141"},{"accessMode": "r","dataForm": {"address": "0X10","afn": "","byteType": "","bytelen": "","collection": "%s","control": "%d","countcollection": "%s","countround": "all","countstrategy": 20,"da": "","data": "null","dt": "","iscount": "0","offset": 0,"operatetype": "readCoils","order": 0,"originaltype": "short16_AB","protocol": "MODBUSRTU","rate": 1,"round": "all","slaveid": "0X10","strategy": "3"},"dataSource": {"": [],"_dlinkindex": "","address": "0X0001","dis": [{"data": "2","key": "0000","undefined": "0000"}],"operatetype": "readIregs","originaltype": "bit","registersnumber": "2","slaveid": "0X01"},"dataType": {"das": [],"specs": {"max": 10000000000000000,"min": 0,"precision": 3,"step": 0,"unit": ""},"type": "int"},"devicetype": "温湿度传感器","identifier": "temp_humid","index": 2,"isaccumulate": false,"isshow": false,"isstorage": false,"moduleType": "properties","name": "温湿度","required": true,"updateAt": "1656584724858"}],"services": [],"tags": []
}

4.如何复制物模型

在产品管理-配置-物模型-查看物模型处

将物模型代码复制粘贴即可

复制完后可以点击编辑查看配置情况，dgiot针对modbusRTU多个数据的情况提供一次性全部读取的方案。

负责采集的物模型的下方数据来源与设备参数配置的一致

6.SHT20传感器设备连接的DTU注册成功

1.SHT20传感器设备连接的DTU注册成功

2.SHT20传感器设备连接的DTU上线成功

3.设备地图显示成功

7.ModbusRTU数据采集成功

1.SHT20传感器实时数据

2.ModbusRTU历史数据

[小 迪 提醒]
没有多个数据的modbusRTU设备的用户可以使用虚拟modbus软件自行模拟。
虚拟modbus连接点击了解详情。

[小 迪 点评]

• dgiot支持ModbusRTU协议的设备接入，有真实设备的用户尝试进行设备接入演练。
• 真实设备的接入针对新手玩家，dgiot的接线步骤将会提供很大的帮助。

想了解更多 dgiot 的具体细节，欢迎大家在GitHub上查看相关源代码。