Modbus --- EasyModbus的简单读取与写入

一.模拟工具Modbus Slave

在这里可以模拟设备
本文模拟Modbus Tcp的方式
1.设置连接配置

2.设置

二. EasyModbusTCP的使用

       EasyModbusTCP是C#在modbus的一个开源库.

1.下载Nuget包

注意 : 版本 <= .net framework4.8
读取示例 :

  ModbusClient modbusClient = new ModbusClient("127.0.0.1", 502);
            try
            {
                modbusClient.UnitIdentifier = 2; //地址
                modbusClient.Baudrate = 9600; //波特率
                modbusClient.Parity = Parity.None; //校验位
                modbusClient.StopBits = StopBits.One; //停止位
                modbusClient.ConnectionTimeout = 500;
                modbusClient.Connect();
                int[] result = modbusClient.ReadHoldingRegisters(0, 1);  //寄存器初始地址号
                StringBuilder builder = new StringBuilder();
                for (int i = 0; i < result.Length; i++)
                {
                    builder.Append(Convert.ToString(result[i]) + "\n");
                }
                richTextBox1.Text = builder.ToString();
                modbusClient.Disconnect();
            }
            catch (Exception ex)
            {
                modbusClient.Disconnect();
            }

写入示例 :
int address = Convert.ToInt32(textBox1.Text); //位置
int value = Convert.ToInt32(textBox2.Text); //写入值
ModbusClient modbusClient = new ModbusClient("127.0.0.1", 502);
try
{
modbusClient.UnitIdentifier = 2; //地址
modbusClient.Baudrate = 9600; //波特率
modbusClient.Parity = Parity.None; //校验位
modbusClient.StopBits = StopBits.One; //停止位
modbusClient.ConnectionTimeout = 500;
modbusClient.Connect();
modbusClient.WriteMultipleRegisters(address, new int[] { value });
modbusClient.Disconnect();
}
catch (Exception ex)
{
modbusClient.Disconnect();
}