C#串口通信程序实例详解

创建C#串口通信程序之命名空间

System.IO.Ports命名空间中最重用的是SerialPort 类。

创建C#串口通信程序之创建SerialPort 对象

通过创建SerialPort 对象，我们可以在程序中控制串口通信的全过程。

我们将要用到的SerialPort 类的方法：

ReadLine()：从输入缓冲区读一新行的值，如果没有，会返回NULL
WriteLine(string)：写入输出缓冲
Open()：打开一个新的串口连接
Close()：关闭

代码如下:

SerialPort sp = new SerialPort ();

默认情况下，DataBits 值是8，StopBits 是1，通信端口是COM1。这些都可以在下面的属性中重新设置：

BaudRate：串口的波特率
StopBits：每个字节的停止位数量
ReadTimeout：当读操作没有完成时的停止时间。单位，毫秒
还有不少其它公共属性，自己查阅MSDN。

创建C#串口通信程序之串口的硬件知识

在数据传输的时候，每个字节的数据通过单个的电缆线传输。包包括开始位，数据，结束为。一旦开始位传出，后面就会传数据，可能是5，6，7或8位，就看你的设定了。发送和接收必须设定同样的波特率和数据位数。

创建C#串口通信程序之无猫模式

没有Modem模式的电缆只是简单地交叉传送和接收线。同样DTR & DSR, 和 RTS & CTS也需要交叉。这里，我们三条线。互连2和3（一段的2pin连接3pin），连接两端的5pin。

创建C#串口通信程序示例程序

如果想使用默认属性，按“Save Status”按钮，如果想改变属性按“Property”。设定好之后，可以通信了。

主窗口的代码

代码如下:

#region Using directives

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Windows.Forms; 
using System.IO.Ports;

#endregion 
namespace Serialexpample
{
    partial class Form1 : Form
    {
        //create instance of property page 
        //property page is used to set values for stop bits and 
        //baud rate 
        PropertyPage pp = new PropertyPage();
        //create an Serial Port object 
        SerialPort sp = new SerialPort();
        public Form1()
        {
            InitializeComponent();
        }

private void propertyButton_Click(object sender, EventArgs e)
        {
            //show property dialog 
            pp.ShowDialog();
            propertyButton.Hide();
        }

private void sendButton_Click(object sender, EventArgs e)
        {
            try
            {
                //write line to serial port 
                sp.WriteLine(textBox.Text);
                //clear the text box 
                textBox.Text = "";
            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }

}

private void ReadButton_Click(object sender, EventArgs e)
        {
            try
            {
                //clear the text box 
                textBox.Text = "";
                //read serial port and displayed the data in text box 
                textBox.Text = sp.ReadLine();
            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }
        }

private void Form1_Load(object sender, EventArgs e)
        {

}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            MessageBox.Show("Do u want to Close the App");
            sp.Close();
        }

private void startCommButton_Click(object sender, EventArgs e)
        {
            startCommButton.Hide();
            sendButton.Show();
            readButton.Show();
            textBox.Show();
        }

//when we want to save the status(value) 
        private void saveStatusButton_Click_1(object sender, EventArgs e)
        {
            //display values 
            //if no property is set the default values 
            if (pp.bRate == "" && pp.sBits == "")
            {
                dataBitLabel.Text = "BaudRate = " +
                 sp.BaudRate.ToString();
                readTimeOutLabel.Text = "StopBits = " +
                sp.StopBits.ToString();
            }
            else
            {
                dataBitLabel.Text = "BaudRate = " +
                 pp.bRate;
                readTimeOutLabel.Text = "StopBits = " + pp.sBits;
            }  //创建C#串口通信程序

parityLabel.Text = "DataBits = " +
             sp.DataBits.ToString();
            stopBitLabel.Text = "Parity = " +
             sp.Parity.ToString();
            readTimeOutLabel.Text = "ReadTimeout = " +
              sp.ReadTimeout.ToString();

if (propertyButton.Visible == true)
                propertyButton.Hide();
            saveStatusButton.Hide();
            startCommButton.Show();

try
            {
                //open serial port 
                sp.Open();
                //set read time out to 500 ms 
                sp.ReadTimeout = 500;
            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }
        }
    }
}

创建C#串口通信程序之属性设置对话框代码:

代码如下:

#region Using directives 
using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms;

#endregion 
namespace Serialexpample
{
    partial class PropertyPage : Form
    {
        //variables for storing values of baud rate and stop bits 
        private string baudR = "";
        private string stopB = "";

//property for setting and getting baud rate and stop bits 
        public string bRate
        {
            get
            {
                return baudR;
            }
            set
            {
                baudR = value;
            }
        }

public string sBits
        {
            get
            {
                return stopB;
            }
            set
            {
                stopB = value;
            }
        }

public PropertyPage()
        {
            InitializeComponent();
        }

private void cancelButton_Click(object sender, EventArgs e)
        {
            this.bRate = "";
            this.sBits = "";
            //close form 
            this.Close();
        }

private void okButton_Click_1(object sender, EventArgs e)
        {
            //here we set the value for stop bits and baud rate. 
            this.bRate = BaudRateComboBox.Text;
            this.sBits = stopBitComboBox.Text;
            // 
            this.Close();
        }
    }
}

C#串口通信程序创建的相关内容就向你介绍到这里，希望对你了解创建C#串口通信程序的步骤和需要注意的事宜。