C#串口數據互通小程式

主要功能：

所編寫的程式需將串口1、串口2數據互通，即：串口1接收到數據的同時將數據通過串口2發出，串口2接收到數據的同時將數據通過串口1發出。

並根據需要由指定串口發送或獲取數據。

代碼如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;

namespace 串口互通
{
    public partial class Form1 : Form
    {
        private SerialPort comm4 = new SerialPort("COM4", 115200, Parity.None, 8, StopBits.One);//因為我測試設備採用的是COM4和COM5兩個串口，所以就直接在上面定義了
        private SerialPort comm5 = new SerialPort("COM5", 115200, Parity.None, 8, StopBits.One);
        private StringBuilder builder = new StringBuilder();//避免在事件處理方法中反覆的創建，定義到外面
        byte[] buf1 = new byte[9] {90, 165, 6, 131, 0, 0, 1, 0, 2};//向串口下發的指令，在實際情況中是設備啟動報文
        byte[] buf2 = new byte[9] {90, 165, 6, 131, 0, 0, 1, 0, 1};//設備停止報文
        public Form1()
        {
            InitializeComponent();
        }
        //打開串口按鈕
        private void button1_Click(object sender, EventArgs e)
        {

            comm4.Open();
            comm5.Open();
            button1.Enabled=false;
            button2.Enabled=true;
        }
        //綁定方法到數據接收事件
        private void Form1_Load(object sender, EventArgs e)
        {
            comm4.DataReceived+=comm4_DataReceived;
            comm5.DataReceived+=comm5_DataReceived;
        }
        //com5口接收到的數據從com4口發出
        private void comm5_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            int n = comm5.BytesToRead;
            byte[] buf = new byte[n];//聲明一個臨時數組存儲當前來的串口數據
            comm5.Read(buf, 0, n);//讀取緩衝數據
            builder.Clear();//清除字元串構造器的內容
            comm4.Write(buf, 0, buf.Length);//數據從com4口發出
        }   
        //com4接收到的數據從com5口發出
        private void comm4_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            int n = comm4.BytesToRead;
            byte[] buf = new byte[n];//聲明一個臨時數組存儲當前來的串口數據
            comm4.Read(buf, 0, n);//讀取緩衝數據
            builder.Clear();//清除字元串構造器的內容
            comm5.Write(buf, 0, buf.Length);//數據從com5口發出
        }
        //關閉串口按鈕
        private void button2_Click(object sender, EventArgs e)
        {

            comm4.Close();
            comm5.Close();
            button2.Enabled=false;
            button1.Enabled=true;
        }
        //設備啟動
        private void button3_Click(object sender, EventArgs e)
        {
            comm5.Write(buf1, 0, buf1.Length);
        }
        //設備停止
        private void button4_Click(object sender, EventArgs e)
        {
            comm5.Write(buf2, 0, buf2.Length);
        }
    }
}