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README
LGPL-3.0

ModbusOver

1. 项目简介

​ ModbusOver基于标准Modbus协议编写,主要目的是为了解决实践中遇到的与各种Modbus设备进行通信的问题。

​ 在项目实践中,遇到许多设备并非是像标准Modbus协议那样的,在串行线路使用ModbusRTU,在LAN线路中使用ModbusTCP,也有扩展到UDP通信的设备,多样而复杂,因此在本项目中,Modbus协议构建与通信链路接口设计是相互分开的,可以自由的使用 ModbusRTU Over TCP 或者反过来使用。

2. 项目进度

目前仅实现Master端。

2.1 Modbus协议

  • Modbus RTU
  • Modbus TCP
  • Modbus ASCII

2.2 通信接口

  • TCP
  • Serial Port
  • UDP

2.3 协议接口

  • 读线圈 0x01
  • 读离散量输入 0x02
  • 读保持寄存器 0x03
  • 读输入寄存器 0x04
  • 写单个线圈 0x05
  • 写单个寄存器 0x06
  • 读异常状态 0x07
  • 诊断 0x08
  • 获得事件计数器 0x0B
  • 获得事件记录 0x0C
  • 写多个线圈 0x0F
  • 写多个寄存器 0x10
  • 报告从站ID 0x11
  • 读文件记录 0x14
  • 写文件记录 0x15
  • 掩码写寄存器 0x16
  • 读写多个寄存器 0x17
  • 读FIFO队列 0x18
  • 读设备标识码 0x2B
  • 封装接口传输 0x2B
  • CANopen 通用引用 0x2B

3. 编译

本项目基于C++23标准编写,在VS2022下编译通过。

3.1 第三方库

  • boost

3.2 环境变量设置

2. 环境变量设置

  • 添加 BOOST_ROOT 变量,并设置值为 BOOST库根目录,比如:C:\local\boost_1_82_0
  • 添加 BOOST_LIBRARYDIR 变量,并设置值为 BOOST lib库所在目录,比如:%BOOST_ROOT%\lib64-msvc-14.3
  • 添加 BOOST_INCLUDEDIR 变量,并设置值为 BOOST 头文件目录,比如 %BOOST_ROOT%

4. 使用

  • 注意:ModbusTCP要求的默认从机ID为0xFF,因为在串口连接中,数据路由由从机ID实现,而在TCP连接中,由TCPIP协议实现,在TCP连接中应设置为0xFF,所以本项目的默认从机ID也为0xFF,所以在连接时,应当自行设置从机ID,即调用setSlave函数,否则在进行串口连接时可能失败

  • setSlave函数也可以在连接前调用,connect函数并不修改从机ID

  • 在串口通信中可以使用广播,广播使用的从机ID为0,也可使用ModbusOver::Broadcast

4.1 连接设备

4.1.1 连接TCP设备

ModbusOver::Master master;
master.connect(ModbusOver::Address<ModbusOver::AddressType::TCP>("192.168.1.150"));
master.setSlave(1); // 设置从机ID
// Do something ...
master.close();

按照标准Modbus协议,在TCP上实现的Modbus使用的端口默认为502,如果需要设置端口号,则:

master.connect(ModbusOver::Address<ModbusOver::AddressType::TCP>("192.168.1.150", 5000));

在TCP链路中,默认使用的时ModbusTCP协议,如果需要使用ModbusRTU Over TCP,则:

master.connect(ModbusOver::Address<ModbusOver::AddressType::TCP>("192.168.1.150", 5000, ModbusOver::ModbusProtocol::ModbusRTU));

4.1.2 连接串口设备

ModbusOver::Master master;
master.connect(ModbusOver::Address<ModbusOver::AddressType::SerialPort>("COM5"));
master.setSlave(1);// 设置从机ID
// Do something ...
master.close();

按照标准Modbus协议,在串口上实现的Modbus默认连接参数为:

  • 波特率:9600

  • 数据位:8

  • 停止位:1

  • 校验:Even,注意:如果使用 None 则需要2个停止位

  • 流控制:None,协议中并未提到流控制,默认使用None

如果需要以自定义的参数连接,则:

master.connect(ModbusOver::Address<ModbusOver::AddressType::SerialPort>("COM5", 9600, ModbusOver::DataBits::Data8, ModbusOver::FlowControl::None, ModbusOver::Parity::Even, ModbusOver::StopBits::One));

如果需要在串口连接中使用其他协议,则:

master.connect(ModbusOver::Address<ModbusOver::AddressType::SerialPort>("COM5", ModbusOver::ModbusProtocol::ModbusRTU);
// 或
master.connect(ModbusOver::Address<ModbusOver::AddressType::SerialPort>("COM5", 9600, ModbusOver::DataBits::Data8, ModbusOver::FlowControl::None, ModbusOver::Parity::Even, ModbusOver::StopBits::One, ModbusOver::ModbusProtocol::ModbusRTU));
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简介

C++ Modbus实现,支持ModbusRTU,ModbusTCP,ModbusASCII,协议与通信链路接口分开设计,可轻松实现ModbusRTU Over TCP等非标准用法。 展开 收起
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