[sniperjawadino]

قم بإضافة أداة SerialPort1      Button1   Textbox1


وضع هذا الكود في Button1 
مع تغيير الإعدادات التي تناسب الآلة  PortName    BaudRate

كود :

       SerialPort1.PortName = COM1
       SerialPort1.BaudRate = 9600
       SerialPort1.Parity = IO.Ports.Parity.None
       SerialPort1.StopBits = IO.Ports.StopBits.One
       SerialPort1.DataBits = 8
       'SerialPort1.Handshake = IO.Ports.Handshake.None
       'SerialPort1.Encoding = System.Text.Encoding.ASCII
       SerialPort1.Open()

ثم ضع هذا الكود في الفورم

كود :

   Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
       ReceivedText(SerialPort1.ReadExisting())    'Automatically called every time a data is received at the SerialPort1
   End Sub
   Delegate Sub SetTextCallback(ByVal [text] As String) 'Added to prevent threading errors during receiveing of data
   Private Sub ReceivedText(ByVal [text] As String)
       'compares the ID of the creating Thread to the ID of the calling Thread
       If Me.rtbReceived.InvokeRequired Then
           Dim x As New SetTextCallback(AddressOf ReceivedText)
           Me.Invoke(x, New Object() {(text)})
       Else
           Me.rtbReceived.Text &= [text]
           Me.TextBox1.Text = [text]
       End If
   End Sub