C# 串口通信简单示例

C# 简单串口通信示例

串口通信
示例代码

串口通信

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);

示例代码

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：8comboBoxStopbit.Text = "1"; // 默认停止位：1comboBoxCheck.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));}else{ textBoxRecv.AppendText(str);                 }}))); // 对话框追加显示数据}public static string byteToHexStr(byte[] bytes){string hexStr = "";try{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") {try{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);}}else{try{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try{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){}}
}