通过虚拟COM端口将数据发送到Honeywell Xenon 1902条形码阅读器

时间:2017-12-12 15:17:53

标签: vb.net barcode-scanner virtual-serial-port

我正在尝试向Honeywell Xenon 1902条形码扫描仪发送查询。扫描仪通过虚拟COM端口连接。 设置通信工作正常:

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,我会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

现在我想发送查询命令" cbr?。"从霍尼韦尔文档到扫描仪并获得答案。如果我在霍尼韦尔WebInterface上这样做,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

2 个答案:

答案 0 :(得分:0)

也许,在命令末尾删除“vbCr”可能有效 “区域 - 成像扫描仪用户指南”第11-1页的“菜单命令语法”前缀中有一个CR代码,但“cbr?”中没有CR代码。第11-3页上的“查询命令示例”。

或者,您可以使用名为SerialPort / USB协议监视器/嗅探器的软件/硬件来调查正在进行的通信类型。

答案 1 :(得分:0)

由于kunif提示,我再次阅读霍尼韦尔文档并解决了我的问题:

该命令需要前缀“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

然后我得到了文档中定义的答案。