SerialPort基本小例

SerialPort是用于串口通信的控件与VB6中的MSCOMM控件相似，使用很方便...

vb.net Code
Imports System.IO.Ports
Imports System.Text
Public Class Form1
    Dim RS232Com As New SerialPort
    Dim mPortName As String
    Public Sub OpenCOM()
        mPortName = Me.CmbCom.SelectedItem.ToString
        RS232Com = New SerialPort(mPortName, 9600, Parity.None, 8, StopBits.One)
        RS232Com.Encoding = Encoding.ASCII
        If Not RS232Com.IsOpen Then RS232Com.Open()
    End Sub
    Public Sub CloseCOM()
        If RS232Com.IsOpen Then RS232Com.Close()
    End Sub

    Private Sub BtnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnOpen.Click
        Call OpenCOM()
    End Sub

    Private Sub BtnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnClose.Click
        Call CloseCOM()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each sp As String In SerialPort.GetPortNames
            Me.CmbCom.Items.Add(sp)
        Next
        Me.CmbCom.SelectedIndex = 0
    End Sub

    Private Sub BtnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSend.Click
        RS232Com.Write(Me.TextBox1.Text) '即写命令过去
    End Sub
Private Sub BtnReceived_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnReceived.Click
        Dim sOut As String
        sOut = RS232Com.ReadExisting 'sOut即读到的字符串
    End Sub
End Class