主要功能：
所编写的程序需将串口1、串口2数据互通，即：串口1接收到数据的同时将数据通过串口2发出，串口2接收到数据的同时将数据通过串口1发出。
并根据需要由指定串口发送或获取数据。
代码如下：
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);//因为我测试设备采用的是COM4和COM5两个串口，所以就直接在上面定义了 private SerialPort comm5 = new SerialPort("COM5", 115200, Parity.None, 8, StopBits.One); private StringBuilder builder = new StringBuilder();//避免在事件处理方法中反复的创建，定义到外面 byte[] buf1 = new byte[9] {90, 165, 6, 131, 0, 0, 1, 0, 2};//向串口下发的指令，在实际情况中是设备启动报文 byte[] buf2 = new byte[9] {90, 165, 6, 131, 0, 0, 1, 0, 1};//设备停止报文 public Form1() { InitializeComponent(); } //打开串口按钮 private void button1_Click(object sender, EventArgs e) { comm4.Open(); comm5.Open(); button1.Enabled=false; button2.Enabled=true; } //绑定方法到数据接收事件 private void Form1_Load(object sender, EventArgs e) { comm4.DataReceived+=comm4_DataReceived; comm5.DataReceived+=comm5_DataReceived; } //com5口接收到的数据从com4口发出 private void comm5_DataReceived(object sender, SerialDataReceivedEventArgs e) { int n = comm5.BytesToRead; byte[] buf = new byte[n];//声明一个临时数组存储当前来的串口数据 comm5.Read(buf, 0, n);//读取缓冲数据 builder.Clear();//清除字符串构造器的内容 comm4.Write(buf, 0, buf.Length);//数据从com4口发出 } //com4接收到的数据从com5口发出 private void comm4_DataReceived(object sender, SerialDataReceivedEventArgs e) { int n = comm4.BytesToRead; byte[] buf = new byte[n];//声明一个临时数组存储当前来的串口数据 comm4.Read(buf, 0, n);//读取缓冲数据 builder.Clear();//清除字符串构造器的内容 comm5.Write(buf, 0, buf.Length);//数据从com5口发出 } //关闭串口按钮 private void button2_Click(object sender, EventArgs e) { comm4.Close(); comm5.Close(); button2.Enabled=false; button1.Enabled=true; } //设备启动 private void button3_Click(object sender, EventArgs e) { comm5.Write(buf1, 0, buf1.Length); } //设备停止 private void button4_Click(object sender, EventArgs e) { comm5.Write(buf2, 0, buf2.Length); } } }