串口调试助手源代码 vb.net

串口调试助手是一种用于调试串口通信的工具，它可以通过串口与外部设备进行数据交互。下面是一个用VB.NET编写的串口调试助手的源代码。

Imports System
Imports System.IO.Ports

Public Class Form1
    Dim myPort As New SerialPort()

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        '设置串口参数
        myPort.BaudRate = 9600
        myPort.PortName = "COM1"
        myPort.Parity = Parity.None
        myPort.DataBits = 8
        myPort.StopBits = StopBits.One

        '打开串口
        myPort.Open()
    End Sub

    Private Sub btnSend_Click(sender As Object, e As EventArgs) Handles btnSend.Click
        '发送数据
        myPort.Write(txtSend.Text)
    End Sub

    Private Sub btnReceive_Click(sender As Object, e As EventArgs) Handles btnReceive.Click
        '接收数据
        Dim data As String = myPort.ReadExisting()
        lblReceive.Text = data
    End Sub

    Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
        '清除接收数据
        lblReceive.Text = ""
    End Sub

    Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
        '关闭串口
        myPort.Close()
    End Sub
End Class

该代码是一个Windows窗体应用程序，有一个文本框用于输入要发送的数据，一个标签用于显示接收到的数据。通过点击发送按钮可以将文本框中的数据发送给外部设备，通过点击接收按钮可以接收外部设备发送的数据，点击清除按钮可以清空接收数据。在加载窗体时，会自动打开COM1串口进行通信，当窗体关闭时会自动关闭串口。

以上就是一个用VB.NET编写的串口调试助手源代码。希望对你有所帮助！