vb.net - 串口读取包括在 vb.net 中写入的内容

Question

所以我正在尝试使用 AT 命令与 gsm 调制解调器通话，我正在尝试通过发送命令 AT 并接收 OK 来进行基本测试以确保调制解调器正常。问题是我收到“AT Blank Line OK”，有什么办法让我发送 AT 时，我只读 OK？

Imports System.IO.Ports

Public Class GUI
Dim Device As New System.IO.Ports.SerialPort()
Private Sub GUI_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)         Handles MyBase.Load
    Port.Text = "Select Port"
    For Each item As String In IO.Ports.SerialPort.GetPortNames
        Port.Items.Add(item)
    Next
    Device.BaudRate = 9600
    Device.Parity = Parity.None
    Device.StopBits = StopBits.One
    Device.DataBits = 8
    Device.Handshake = Handshake.RequestToSend
    Device.DtrEnable = True
    Device.RtsEnable = True
    Device.NewLine = vbCrLf
    Device.WriteTimeout = 5000
End Sub

Private Sub Port_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Port.SelectedIndexChanged
    Device.PortName = Port.SelectedItem.ToString
End Sub

Private Sub Send_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send.Click
    Try
        Device.Open()
        Dim msg As String
        msg = Message.Text
        Device.DiscardInBuffer()
        Device.DiscardOutBuffer()
        Device.Write("AT" & vbCrLf)
        MsgBox(Device.ReadExisting())
    Catch ex As Exception
        MsgBox("Error!")
    End Try
    Device.Close()
End Sub
End Class

Answer 1

听起来调制解调器设置为 Echo 命令。要关闭此功能，请尝试发送 E0第一的。

More info here