Problem in reading data from serial port continuously- application hangs after sometimes

I need to read data from two COM port and order of data appearance from COM port is not fixed. 
I have used small timeout and reading data in while loop continously . If my application is steady for sometime it gets hangs and afterwards it doesnt receive any data again. 
Then I need to restart my application again to make it work.
I am attaching VI. Let me know any issue.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet
Attachments:
Scanning.vi ‏39 KB

billko wrote:
Ranjeet_Singh wrote:
I need to read data from two COM port and order of data appearance from COM port is not fixed. 
I have used small timeout and reading data in while loop continously . If my application is steady for sometime it gets hangs and afterwards it doesnt receive any data again. 
Then I need to restart my application again to make it work.
I am attaching VI. Let me know any issue.
What do you mean, "not fixed?"  If there is no termination character, no start/stop character(s) or even a consistent data length, then how can you really be sure when the data starts and stops?
I probably misunderstood you though.  Assuming the last case is not ture - there is a certain length to the data - then you should use the bytes at port, like in the otherwise disastrous serial port read example.  In this case, it's NOT disastrous.  You have to make sure that you read all the data that came through.  Right now you have no idea how much data you just read.  Also, if this is streaming data, you might want to break it out into a producer/consumer design pattern.
Not fixed means order is not fixed, data from any com port can come anytime. lenght is fixed, one com port have 14 byte and other 8 byte fixed..
Reading data is not an issue for me as it works nice but I have a query that why my application hangs after sometime and stops reading data from COM PORT.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet

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  • Reading Data from serial (Comm) Port in developer200 forms 6i

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    Hello,
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    Sean C.
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    Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
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       BorderStyle     =   1  'Fixed Single
       Caption         =   "Aakar GUI"
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       ClientLeft      =   60
       ClientTop       =   375
       ClientWidth     =   6105
       LinkTopic       =   "Form1"
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       MinButton       =   0   'False
       ScaleHeight     =   311
       ScaleMode       =   3  'Pixel
       ScaleWidth      =   407
       StartUpPosition =   3  'Windows Default
       Begin VB.CommandButton cmdPort
          Caption         =   "Open Port"
          Height          =   375
          Left            =   120
          TabIndex        =   4
          Top             =   600
          Width           =   1455
       End
       Begin VB.ComboBox cmbPort
          Height          =   315
          ItemData        =   "Form1.frx":0000
          Left            =   120
          List            =   "Form1.frx":0016
          Style           =   2  'Dropdown List
          TabIndex        =   3
          Top             =   120
          Width           =   2895
       End
       Begin VB.CommandButton cmdEnd
          Caption         =   "End"
          Height          =   495
          Left            =   1560
          TabIndex        =   2
          Top             =   1320
          Width           =   1215
       End
       Begin VB.CommandButton cmdStart
          Caption         =   "Start"
          Height          =   495
          Left            =   120
          TabIndex        =   1
          Top             =   1320
          Width           =   1215
       End
       Begin VB.TextBox txtMessage
          Height          =   2040
          Left            =   119
          MultiLine       =   -1  'True
          ScrollBars      =   3  'Both
          TabIndex        =   0
          Top             =   2475
          Width           =   5848
       End
       Begin VB.Timer tmrRead
          Enabled         =   0   'False
          Interval        =   1
          Left            =   2040
          Top             =   600
       End
       Begin MSCommLib.MSComm MSComm1
          Left            =   3120
          Top             =   360
          _ExtentX        =   1164
          _ExtentY        =   1164
          _Version        =   393216
          DTREnable       =   0   'False
          ParityReplace   =   45
          SThreshold      =   1
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       Begin VB.Label Label5
          Caption         =   "Result Data:"
          Height          =   375
          Left            =   120
          TabIndex        =   5
          Top             =   2115
          Width           =   1320
       End
    End
    Attribute VB_Name = "Form1"
    Attribute VB_GlobalNameSpace = False
    Attribute VB_Creatable = False
    Attribute VB_PredeclaredId = True
    Attribute VB_Exposed = False
    Option Explicit
    Dim PortIsOpen As Boolean
    Dim Answers(4) As String
    Dim RejectKeystroke As Boolean
    Private Sub cmbPort_Change()
    Debug.Print cmbPort.ListIndex
    End Sub
    Private Sub cmbPort_Validate(Cancel As Boolean)
    'Cancel = True
    End Sub
    Private Sub cmdEnd_Click()
    MSComm1.Output = "e"
    txtMessage.Text = ""
    End Sub
    Private Sub cmdPort_Click()
    On Error GoTo ErrorHandler
    If cmbPort.ListIndex < 0 Then Exit Sub
    If PortIsOpen Then
        cmbPort.Enabled = True
        MSComm1.PortOpen = False
        PortIsOpen = False
        cmdPort.Caption = "Open Port"
        cmdStart.Enabled = False
        cmdEnd.Enabled = False
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        MSComm1.CommPort = cmbPort.ListIndex + 1
        cmbPort.Enabled = False
        MSComm1.PortOpen = True
        PortIsOpen = True
        cmdPort.Caption = "Close Port"
        cmdStart.Enabled = True
        cmdEnd.Enabled = True
    End If
    Exit Sub
    ErrorHandler:
    Debug.Print Err.Number
    Debug.Print Err.Description
    MsgBox Err.Description, vbExclamation Or vbOKOnly, "Error opening port"
    cmbPort.Enabled = True
    PortIsOpen = False
    cmdPort.Caption = "Open Port"
    cmdStart.Enabled = False
    cmdEnd.Enabled = False
    End Sub
    Private Sub cmdStart_Click()
    MSComm1.Output = "s"
    txtMessage.Text = ""
    End Sub
    Private Sub Form_Initialize()
    Dim tmp As Variant
    tmp = InitCommonControls
    End Sub
    Private Sub Form_Load()
    Answers(0) = "A"
    Answers(1) = "B"
    Answers(2) = "C"
    Answers(3) = "D"
    'MSComm1.Settings = "9600,n,8,1"
    ''MSComm1.Settings = "115200,n,8,1"
    'MSComm1.PortOpen = True
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    MSComm1.RThreshold = 1                  ' use 'on comm' event processing
    MSComm1.Settings = "9600,n,8,1"         ' baud, parity, data bits, stop bits
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    MSComm1.InputMode = comInputModeText    'comInputModeBinary  ' binary mode, you can also use
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    PortIsOpen = False
    cmbPort.ListIndex = 0
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    MSComm1.PortOpen = True
    cmbPort.Enabled = False
    PortIsOpen = True
    cmdPort.Caption = "Close Port"
    cmdStart.Enabled = True
    cmdEnd.Enabled = True
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    PortIsOpen = False
    cmbPort.Enabled = True
    cmdPort.Caption = "Open Port"
    cmdStart.Enabled = False
    cmdEnd.Enabled = False
    End Sub
    Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
    If MSComm1.PortOpen Then MSComm1.PortOpen = False
    End Sub
    Private Sub lblOption_Click()
    End Sub
    Private Sub MSComm1_OnComm()
    ' Synopsis:     Handle incoming characters, 'On Comm' Event
    ' Description:  By setting MSComm1.RThreshold = 1, this event will fire for
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    '               Set MSComm1.RThreshold = 0 if you want to poll the control
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    '               In most cases, OnComm Event processing shown here is the prefered
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        Dim i As Long
        Dim sBuff    As String           ' buffer for holding incoming characters
        Const MTC       As String = vbCrLf  ' message terminator characters (ususally vbCrLf)
        Const LenMTC    As Long = 2         ' number of terminator characters, must match MTC
        Dim iPtr        As Long             ' pointer to terminatior character
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        ' so get the Event ID & process
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            Case comEvReceive
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                PacketLength = 0
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                        Packet(PacketLength) = ch
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                If (PacketLength <> 4 And PacketLength <> 3) Then Debug.Print "Unknown packet of length" + Str(PacketLength) + " recieved"
                txtMessage.Text = txtMessage.Text + vbCrLf
            ' An EOF charater was found in the input stream
            Case comEvEOF
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                DoEvents
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                DoEvents
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                DoEvents
            ' Data Lost.
            Case comEventOverrun
                DoEvents
            ' Receive buffer overflow.
            Case comEventRxOver
                DoEvents
            ' Parity Error.
            Case comEventRxParity
                DoEvents
            ' Transmit buffer full.
            Case comEventTxFull
            ' Unexpected error retrieving DCB]
            Case comEventDCB
                DoEvents
        End Select
    End Sub
    Private Sub tmrRead_Timer()
    'MSComm1.Output = vbCrLf + vbCrLf
    'MSComm1.Output = Chr(128)
    End Sub
    Private Sub txtMessage_KeyDown(KeyCode As Integer, Shift As Integer)
    If Shift = 2 Or Shift = 4 Then RejectKeystroke = False Else RejectKeystroke = True
    End Sub
    Private Sub txtMessage_KeyPress(KeyAscii As Integer)
    If RejectKeystroke Then
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    End SubThanks in advance..

    I want to replicate the entire VB program as Java Program.
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  • Stoping VI inbetween when program seeking data from serial port.

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  • Problem while reading data  from USB with JSR80

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    import java.util.List;
    import javax.usb.*;
    import java.util.List;
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                       int type = ep.getType();
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                       pipe.open();
                       // Perform I/O through the USB pipe here.
                       pipe.close();
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                   e.printStackTrace();
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         at com.ibm.jusb.os.DefaultUsbInterfaceOsImp.claim(DefaultUsbInterfaceOsImp.java:54)
         at com.ibm.jusb.UsbInterfaceImp.claim(UsbInterfaceImp.java:109)
         at com.ibm.jusb.UsbInterfaceImp.claim(UsbInterfaceImp.java:83)
         at USBReader.testIO(USBReader.java:60)
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    Cannot claim an interface on a virtual root hubSo don't do that? I have no idea how to tell, but clearly you need to test a few more attributes before you claim. Or else just log the claim error and continue with the next interface.

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