通过虚拟 com 端口将数据发送到 Honeywell Xenon 1902 条码 reader

Question

我正在尝试向 Honeywell Xenon 1902 条码扫描器发送查询。扫描仪通过虚拟 COM 端口连接。设置通信正常：

With SerialPort1

        If Not .IsOpen Then
            Try
                .PortName = "Com9"
                .BaudRate = 115200
                .DataBits = 8
                .Parity = Parity.None
                .StopBits = StopBits.One
                .Handshake = Handshake.None
                .DtrEnable = False
                .RtsEnable = False

                .Open()

            Catch ex As Exception
                MessageBox.Show(ex.Message & vbNewLine & ex.StackTrace, "Fehler beim Öffnen des COM Ports", MessageBoxButtons.OK, MessageBoxIcon.Error)
            End Try

        End If

    End With

当我手动按下扫描按钮时，我收到扫描仪读取的数据：

Private Sub SerialPort1_DataReceived(sender As Object, e As SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived

    Try

        Dim sp As SerialPort = CType(sender, SerialPort)
        PufferString = sp.ReadExisting

        MsgBox(PufferString)

    Catch ex As Exception
        MessageBox.Show(ex.Message & vbNewLine & ex.StackTrace, "Fehler beim Empfangen", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try

End Sub

现在我想将霍尼韦尔文档中的查询命令 "cbr?." 发送到扫描仪并接收答案。如果我在 Honeywell WebInterface 上执行此操作，一切正常：

Screenshot from the Honeywell Web Interface Terminal 所以我的问题是我无法通过 Tera Term 或任何其他终端或我的代码向扫描仪发送命令：

 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Dim BefehlsString As String = "cbr?."
    Dim enc As System.Text.Encoding = New System.Text.ASCIIEncoding()

    Try
        Dim ByteArray() As Byte                             ' Oder String in ...
        ByteArray = enc.GetBytes(BefehlsString & vbCr)             ' ... Einzelbytes umwandeln
        SerialPort1.BaseStream.Write(ByteArray, 0, ByteArray.Length)   ' Einzelbytes senden

    Catch ex As Exception
        MessageBox.Show(ex.Message & vbNewLine & ex.StackTrace, "Fehler beim Senden", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try

End Sub

Answer 1

或许，删除命令末尾的 "vbCr" 可能会奏效。
Area-Imaging Scanner User's Guide第11-1页的"Menu Command Syntax"前缀有CR码，11-3页"Examples of Query Commands"的"cbr?."没有CR码.

或者，您可以使用称为 SerialPort/USB 协议 monitor/sniffer.

的 software/hardware 调查正在发生的通信类型

Answer 2

由于 kunif 提示，我再次阅读了霍尼韦尔文档并解决了我的问题：

命令需要前缀 "SYN M CR" (ASCII 22,77,13) --> "SYNMCRcbr?." 必须通过串行连接发送到扫描仪。

这是我发送给扫描仪的代码：

 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Try

        Dim BefehlsString As String = Chr(&H16) & "M" & Chr(&HD) & "cbr?."  

        serialport.WriteLine(BefehlsString)

    Catch ex As Exception
        MessageBox.Show(ex.Message & vbNewLine & ex.StackTrace, "Fehler beim Senden", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try

End Sub

然后我得到文档中定义的答案。

通过虚拟 com 端口将数据发送到 Honeywell Xenon 1902 条码 reader

Send data to Honeywell Xenon 1902 barcode reader via virtual com port

vb.net

barcode-scanner

virtual-serial-port