97 lines
2.7 KiB
Plaintext
97 lines
2.7 KiB
Plaintext
---
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id: 20001
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title: Modbus
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---
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import useBaseUrl from "@docusaurus/useBaseUrl";
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import Tag from "@site/src/components/Tag.js";
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import Highlight from '@site/src/components/Highlight.js';
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## 定义
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程序集：[ThingsGateway.Foundation.Modbus](https://www.nuget.org/packages/ThingsGateway.Foundation.Modbus)
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## 一、说明
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**ThingsGateway.Foundation.Modbus**是对于Modbus协议的封装类库
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支持Tcp/Rtu格式
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支持多个通讯链路：Tcp/Udp/SerialPort
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支持Dtu
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## 二、Modbus主站
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1、创建ModbusMaster
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```
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/// <summary>
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/// 新建链路
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/// </summary>
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/// <returns></returns>
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public IChannel GetChannel()
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{
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TouchSocketConfig touchSocketConfig = new TouchSocketConfig();
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return touchSocketConfig.GetSerialPortWithOption(new("COM1")); //直接获取串口对象
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//return touchSocketConfig.GetChannel(ChannelTypeEnum.SerialPortClient, null, null, new("COM1"));//通过链路枚举获取对象
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}
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/// <summary>
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/// 新建协议对象
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/// </summary>
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/// <param name="channel"></param>
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/// <returns></returns>
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public IProtocol GetProtocol(IChannel channel)
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{
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var client = new ModbusMaster(channel);
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return client;
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}
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```
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2、读写操作
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```
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ModbusMaster modbusMasterTest = new ModbusMaster();
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var channel = modbusMasterTest.GetChannel();
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var protocol = modbusMasterTest.GetProtocol(channel);
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var data = await protocol.ReadDoubleAsync("400001"); //读取保持寄存器地址0
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```
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`400001`是PLC Modbus的地址表示方式，代表保持寄存器地址0
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- 基本地址
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Modbus PLC寄存器
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| 地址 | 功能码 | 说明 |
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| ---------------| --------------|--------------------------|
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| 4xxxxx | 03 | 读取03功能码 |
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| 3xxxxx | 04 | 读取04功能码 |
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| 1xxxxx | 02 | 读取02功能码 |
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| 0xxxxx | 01 | 读取01功能码 |
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- 站号(可选)
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当需要指定站号地址时可使用，举例：
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| 地址 | 说明 |
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| ---------------| --------------------------|
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| s=2;10001 | 读取02功能码 ,设备地址为2 |
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| s=11;40001 | 读取03功能码 ,设备地址为11 |
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- Dtu注册(可选)
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当需要指定Dtu客户端可使用，举例：
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| 地址 | 说明 |
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| ---------------| --------------------------|
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| id=12;40001 | 读取03功能码 ,设备地址为默认，Dtu注册包为"12",注意是UTF8格式 |
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## 三、Modbus从站
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