c# 485串口 读取 继电保护器电流

现在项目需要读取“继电保护器”里的电流、电压、电功等信息，
采样c#串口读取（协议是103规约），谁做过相应的例子，

从串口读取数据，然后根据协议来解析就行了，

public partial class Form1 : Form
{
private System.IO.Ports.SerialPort serialPort1;
string InputData = String.Empty;
delegate void HandleInterfaceUpdateDelegate(string text); //委托，此为重点
HandleInterfaceUpdateDelegate interfaceUpdateHandle;
public Form1()
{
InitializeComponent();
interfaceUpdateHandle = new HandleInterfaceUpdateDelegate(UpdateTextBox);
this.components = new System.ComponentModel.Container();
this.serialPort1 = new System.IO.Ports.SerialPort(this.components);
this.serialPort1.PortName = "COM3";
this.serialPort1.BaudRate = 9600;
this.serialPort1.StopBits = StopBits.One;

       // this.serialPort1.DtrEnable = true;
        //this.serialPort1.RtsEnable = true;

    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (serialPort1.IsOpen){
            serialPort1.Close(); 
            serialPort1.Open(); 
        }
        else{
              serialPort1.Open(); 
        }
        serialPort1.WriteLine("SEND:"+textBox1.Text);

         this.serialPort1.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(serialPort1_DataReceived_1);
         this.serialPort1.ReceivedBytesThreshold = 1;
         System.Threading.Thread.Sleep(3000);

    }
    public void serialPort1_DataReceived_1(object sender, SerialDataReceivedEventArgs e)
    {
       InputData = serialPort1.ReadExisting();

       this.Invoke(interfaceUpdateHandle, new object[] { InputData });
    }
    private void UpdateTextBox(string text)
    {
        textBox2.Text = text;
    }

你确定是com3吗？可以使用com调试助手来帮你从com口接收、发送数据；

类似的例子网上有不少，我不贴代码了