C#实现简单串口通信的示例详解
作者:SongYuLong的博客
这篇文章主要为大家详细介绍了C#实现串口通信的相关知识,文中示例代码介绍的非常详细,具有一定的学习价值,感兴趣的小伙伴们可以跟随小编一起了解一下
C# 串口通信主要操作:
命名空间:using System.IO.Ports;
获取端口:string[] ports = System.IO.Ports.SerialPort.GetPortNames();
设置端口名:serialPort1.PortName = “COM1”; // 字符串
设置波特率:serialPort1.BaudRate = 115200;// int.Parse(“115200”);
设置数据位:serialPort1.DataBits = 1; // int.Parse(“1”);
设置停止位:serialPort1.StopBits = StopBits.One;
-
StopBits.One:停止位1
-
StopBits.OnePointFive:停止位1.5
-
StopBits.Two:停止位2
设置校验位:serialPort1.Parity = Parity.None;
-
Parity.None:无
-
Parity.Even:奇校验
-
Parity.Odd:偶校验
打开串口:serialPort1.Open();
关闭串口:serialPort1.Close();
可读字节:serialPort1.BytesToRead;
读取数据:serialPort1.Read(buffer, 0, len);
写入数据:serialPort1.Write(buffer);
接收事件: XXX_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e);
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;
using System.IO.Ports;
namespace serial_tools
public partial class Form1 : Form
String serialPortName;
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
string[] ports = System.IO.Ports.SerialPort.GetPortNames(); // 获取本机可用串口端口
comboBoxPort.Items.AddRange(ports);
comboBoxPort.SelectedIndex = comboBoxPort.Items.Count > 0 ? 0 : -1; // 有可用端口显示第一个
comboBoxBaudrate.Text = "115200"; // 默认波特率
comboBoxDataBits.Text = "8"; // 默认数据位:8
comboBoxStopbit.Text = "1"; // 默认停止位:1
comboBoxCheck.Text = "无"; // 默认无校验
/// <summary>
/// 重写 系统消息函数
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
base.WndProc(ref m);
/// <summary>
/// 串口数据接收
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
int len = serialPort1.BytesToRead; // 获取可读字节数
byte[] buff = new byte[len]; // 创建缓存数据数组
serialPort1.Read(buff, 0, len); // 把数据读取到buff数组
string str = Encoding.Default.GetString(buff); // Byte值转ASCII字符串
Invoke((new Action(() => {
if (checkBoxHexShow.Checked)
textBoxRecv.AppendText(byteToHexStr(buff));
textBoxRecv.AppendText(str);
}))); // 对话框追加显示数据
public static string byteToHexStr(byte[] bytes)
string hexStr = "";
if (bytes != null) {
for (int i = 0; i < bytes.Length; i++)
hexStr += bytes[i].ToString("X2");
hexStr += " "; // 两个Hex数值以空格隔开
return hexStr;
catch (Exception)
return hexStr;
/// <summary>
/// 打开关闭串口
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonPortOnOff_Click(object sender, EventArgs e)
if (buttonPortOnOff.Text == "打开串口") {
serialPort1.PortName = comboBoxPort.Text; // 获取选择的串口端口
serialPortName = comboBoxPort.Text;
serialPort1.BaudRate = int.Parse(comboBoxBaudrate.Text); // 获取选择的波特率
serialPort1.DataBits = int.Parse(comboBoxDataBits.Text); // 获取选择的数据位
// 设置停止位
if (comboBoxStopbit.Text == "1") { serialPort1.StopBits = StopBits.One; }
else if (comboBoxStopbit.Text == "1.5") { serialPort1.StopBits = StopBits.OnePointFive; }
else if (comboBoxStopbit.Text == "2") { serialPort1.StopBits = StopBits.Two; }
// 设置奇偶校验
if (comboBoxCheck.Text == "无") { serialPort1.Parity = Parity.None; }
else if (comboBoxCheck.Text == "奇校验") { serialPort1.Parity = Parity.Even; }
else if (comboBoxCheck.Text == "偶校验") { serialPort1.Parity = Parity.Odd; }
// 打开串口
serialPort1.Open();
buttonPortOnOff.Text = "关闭串口";
catch (Exception ex)
MessageBox.Show("串口打开失败"+ ex.ToString(), "警告",
MessageBoxButtons.OK, MessageBoxIcon.Error);
serialPort1.Close();
catch (Exception ex)
buttonPortOnOff.Text = "打开串口";
/// <summary>
/// 清空接收数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonClearRecv_Click(object sender, EventArgs e)
textBoxRecv.Clear();
/// <summary>
/// 发送数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonSendData_Click(object sender, EventArgs e)
String Str = textBoxSend.Text.ToString(); // 获取发送文本框里的数据
if (Str.Length > 0) {
serialPort1.Write(Str); // 串口发送数据
catch (Exception)
/// <summary>
/// 清除发送数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonClearSend_Click(object sender, EventArgs e)
textBoxSend.Clear();
private void comboBoxPort_SelectedIndexChanged(object sender, EventArgs e)
private void comboBoxPort_MouseClick(object sender, MouseEventArgs e)
窗体界面设计
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