[英]Serial port read includes what has been written in vb.net
So I am trying to talk to a gsm modem using AT commands, I'm trying to do a basic test to make sure the modem is ok by sending the command AT and receiving OK. 因此,我试图与使用AT命令的gsm调制解调器进行通信,我正在尝试进行基本测试,以通过发送命令AT并接收OK来确保调制解调器正常。 The issue is that I'm receiving "AT Blank Line OK", is there any way so when I send AT, I only read OK?
问题是我收到“ AT Blank Line OK”,请问有什么办法让我在发送AT时只能阅读OK吗?
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
Sounds like the modem is set to Echo commands. 听起来好像调制解调器已设置为Echo命令。 To turn this off try sending
E0
first. 要关闭此功能,请尝试先发送
E0
。
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