发送字符串并使用相同的串行端口“COM1”接收

Question

这可能吗？检查端口是否打开是可以的，但我不知道为什么我发送数据后无法接收数据/字符串。

主要表格：

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    connect_btn.Enabled = False
    With com1
        .PortName = "COM2"
        .BaudRate = 9600
        .Parity = Parity.None
        .StopBits = StopBits.One
        .DataBits = 8
        .Handshake = Handshake.RequestToSend
        .RtsEnable = True
        .DtrEnable = True
    End With
    com1.Open()
    AddHandler RFID.DataReceived, SerialDataReceivedEventHandler1
 End Sub

发送数据：

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
    Dim response As String = TextBox1.Text
    If RFID.IsOpen Then
        RFID.WriteLine(response)
    End If
End Sub

数据接收：

    Private Sub com1_DataReceived(sender As Object, e As IO.Ports.SerialDataReceivedEventArgs)
    If com1.IsOpen = True Then
        read()
    End If
End Sub

Friend Sub DataReceived(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs)
    Dim newReceivedData As String
    newReceivedData = RFID.ReadExisting
    MessageBox.Show(newReceivedData)
End Sub

当我尝试运行它时，没有错误。

EDITED

使用PuTTY和VSPE工作来发送数据。