串口

发送案例：

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;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 窗体创建时执行
        private void Form1_Load(object sender, EventArgs e)
        {
            string str_num;
            // 构建combobox1列表
            for(int i = 0; i < 256; i++)
            {
                str_num = i.ToString("x").ToUpper();
                if(str_num.Length == 1)
                {
                    str_num = "0" + str_num;
                }
                comboBox1.Items.Add("0x" + str_num);
            }
            comboBox1.Text = "0x00";  // 设置默认值
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string str_num = comboBox1.Text;  // 获取combobox1的值
            string Ox_num = str_num.Substring(2, 2);  // 截取十六进制数值
            byte[] buffer = new byte[1];  // 定义一个字节的数据
            buffer[0] = Convert.ToByte(Ox_num, 16);  // 将16进制的字符串转换为byte类型
            // 防止出错
            try
            {
                serialPort1.Open();  // 打开串口
                serialPort1.Write(buffer, 0, 1);  // 写入
                serialPort1.Close();  // 关闭串口
            }
            catch(Exception err)
            {
                if (serialPort1.IsOpen)
                {
                    // 如果串口为开的，那么关闭
                    serialPort1.Close();
                }
                MessageBox.Show(err.ToString(), "错误提示");
            }
        }
    }
}

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;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 窗体创建时执行
        private void Form1_Load(object sender, EventArgs e)
        {
            string str_num;
            // 构建combobox1列表
            for(int i = 0; i < 256; i++)
            {
                str_num = i.ToString("x").ToUpper();
                if(str_num.Length == 1)
                {
                    str_num = "0" + str_num;
                }
                comboBox1.Items.Add("0x" + str_num);
            }
            comboBox1.Text = "0x00";  // 设置默认值
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string str_num = comboBox1.Text;  // 获取combobox1的值
            string Ox_num = str_num.Substring(2, 2);  // 截取十六进制数值
            byte[] buffer = new byte[1];  // 定义一个字节的数据
            buffer[0] = Convert.ToByte(Ox_num, 16);  // 将16进制的字符串转换为byte类型
            // 防止出错
            try
            {
                serialPort1.Open();  // 打开串口
                serialPort1.Write(buffer, 0, 1);  // 写入
                serialPort1.Close();  // 关闭串口
            }
            catch(Exception err)
            {
                if (serialPort1.IsOpen)
                {
                    // 如果串口为开的，那么关闭
                    serialPort1.Close();
                }
                MessageBox.Show(err.ToString(), "错误提示");
            }
        }
    }
}