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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at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
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at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
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at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)hi,
My problem is solved now. We have opened backend system port connection from portal side.
regards,
Krishna -
Reading Data from serial (Comm) Port in developer200 forms 6i
Dears,
I have developed an application using Dev2k forms 6i.
I need to read data from a device (weigh bridge) that is attached to PC on comm port.
scenario: when a vehicle comes on the Weigh bridge it calculates its weight and send it to the PC on serial port.
on when-button-pressed event I want to get data into a text field on form.
If any one has developed such form please help me.
Thanks and regardsyou can:
create java class -> wrap plsql -> invoke plsql-code from button trigger
googling java class instead of creating =) -
I already stablish communication with my serial port using VISA, selecting COM1 as the resoure name.
After that, I tried to read the data from the port (as we know the data was in string format )but I need to convert the data to numeric value to hadle it (no arrays).
Another main thing is that I'm develoing a new based Embedded design and tthe info that will trhow out from the device to the PC is binary.
How can I solved the problem, and if I want to make bidirectional communication with my system how can I do it? The VISA intructions as *IDN? and so forthetc can be recognize by the external system if the COM1 port is recognized by NI Max as ADSRL1::I
NSTR1?Hello,
For an example of bidirectional serial communication in LabVIEW, please see the shipping example LabVIEW <-> Serial.vi. This can be found from LabVIEW by going to Help >> Find Examples. From the example finder, select Hardware Input and Output >> Serial >> LabVIEW <-> Serial.vi.
Once you are able to read the string data in, you can use the VIs in the String/Number Conversion palette to convert the data to numeric format. To access these, right-click on the block diagram >> All Functions >> String >> String/Number Conversion.
Let me know if this does not help.
Regards,
Sean C.
Applications Engineer
National Instruments -
How to get data from serial port to GUI textArea
From Serial Port.....
Messages from base (always 5 bytes):
0xAA, 0, 0, 0, 0xBB - IDLE Mode
0xAA, 0, 0x80, 0x80, 0xBB - Question Mode
messages from terminal (always 6 bytes):
0xAA, a, b, c, chksum, 0xBB
where chksum = a+b+c;
a = address (0-250)
the 2 MSB's of b represenet the answer:
0 0 - A
0 1 - B
1 0 - C
1 1 - D
the 6LSB's of b and 8bits of c is the time for answer, in milliseconds.
(0-16384 milliseconds)
I have VB Code for that but I want the same thing in Java ...
Can any one help me?
Here's VB Code..
VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1
BorderStyle = 1 'Fixed Single
Caption = "Aakar GUI"
ClientHeight = 4665
ClientLeft = 60
ClientTop = 375
ClientWidth = 6105
LinkTopic = "Form1"
MaxButton = 0 'False
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
End
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
Else
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
On Error GoTo ErrorHandler1
MSComm1.CommPort = 1 ' comm port 1
MSComm1.RThreshold = 1 ' use 'on comm' event processing
MSComm1.Settings = "9600,n,8,1" ' baud, parity, data bits, stop bits
MSComm1.SThreshold = 1 ' allows us to track Tx LED
MSComm1.InputMode = comInputModeText 'comInputModeBinary ' binary mode, you can also use
' comInputModeText for text only use
PortIsOpen = False
cmbPort.ListIndex = 0
' open the port
MSComm1.PortOpen = True
cmbPort.Enabled = False
PortIsOpen = True
cmdPort.Caption = "Close Port"
cmdStart.Enabled = True
cmdEnd.Enabled = True
Exit Sub
ErrorHandler1:
Debug.Print Err.Description
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
' each character that arrives in the comm controls input buffer.
' Set MSComm1.RThreshold = 0 if you want to poll the control
' yourself, either via a TImer or within program execution loop.
' In most cases, OnComm Event processing shown here is the prefered
' method of processing incoming characters.
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
' OnComm fires for multiple Events
' so get the Event ID & process
Select Case MSComm1.CommEvent
' Received RThreshold # of chars, in our case 1.
Case comEvReceive
' read all of the characters from the input buffer
' StrConv() is required when using MSComm in binary mode,
' if you set MSComm1.InputMode = comInputModeText, it's not required
'sBuff = sBuff & StrConv(MSComm1.Input, vbUnicode)
'If Len(txtMessage.Text) > 4096 Then txtMessage.Text = ""
sBuff = MSComm1.Input
Dim ch As String
Dim PacketStart As Boolean
Dim PacketLength As Integer
Dim Packet() As String
PacketStart = False
PacketLength = 0
While (Len(sBuff) > 0)
ch = Left(sBuff, 1)
If (ch = Chr(&HAA)) Then PacketStart = True
If (ch = Chr(&HBB)) Then PacketStart = False
If (ch <> Chr(&HAA) And ch <> Chr(&HBB)) Then
PacketLength = PacketLength + 1
ReDim Preserve Packet(PacketLength)
Packet(PacketLength) = ch
End If
'txtMessage.Text = txtMessage.Text + Format(Hex(Asc(ch)), " @@")
sBuff = Right(sBuff, Len(sBuff) - 1)
Wend
If (PacketLength = 3) Then
Debug.Print "Command packet recieved"
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(1)))
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(2)))
End If
If (PacketLength = 4) Then
Debug.Print "Response packet recieved"
txtMessage.Text = txtMessage.Text + "Address =" + Str(Asc(Packet(1))) + _
" Answer = " + Answers((Asc(Packet(2)) And &HC0) / 64) + _
" Time =" + Str((Asc(Packet(2)) And &H3F) * 256 + (Asc(Packet(3)))) + "mS" + vbCrLf
'txtMessage.Text = txtMessage.Text + vbCrLf + "Address =" + Str(Asc(Packet(1)))
'txtMessage.Text = txtMessage.Text + vbCrLf + "Option =" + Str((Asc(Packet(2)) And &HC0) / 64)
'txtMessage.Text = txtMessage.Text + vbCrLf + "Time =" + Str((Asc(Packet(2)) And &H3F) * 256 + (Asc(Packet(3))))
End If
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
DoEvents
' There are SThreshold number of characters in the transmit buffer.
Case comEvSend
DoEvents
' A Break was received.
Case comEventBreak
DoEvents
' Framing Error
Case comEventFrame
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
KeyAscii = 0
End If
End SubThanks in advance..I want to replicate the entire VB program as Java Program.
This has to be included in my project which i am doing in java. -
Stoping VI inbetween when program seeking data from serial port.
I have an application in which I need to read data from two serial port one after other.
One read will read 14 byte and other 08 bytes(Just info).
Now in between if user need to stop the VI then how to stop it?
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--RanjeetA state machine could do this easily. Just have a state to check for the stop (or any other events).
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
Problem while reading data from USB with JSR80
Hi
Iam using Fedora 9 with 32 bit.
Iam using JSR80 api to read the data from USB devices.
I successfully set-up the code as per given on JSR80 site on my eclipsce ide.
below is my code which iam using to read data from usb
import com.ibm.jusb.*;
import java.util.List;
import javax.usb.*;
import java.util.List;
public class USBReader {
public static UsbInterface interf = null;
public static void main(String[] args) {
try
{// Access the system USB services, and access to the root
// hub. Then traverse through the root hub.
System.out.println("Application started");
UsbServices services = UsbHostManager.getUsbServices();
UsbHub rootHub = services.getRootUsbHub();
traverse(rootHub);
testIO(rootHub);
} catch (Exception e) {
System.out.println("The Exception occured"+e.getMessage());
public static void traverse(UsbDevice device){
System.out.println("Iam in traverse ");
if (device.isUsbHub()){
// This is a USB Hub, traverse through the hub.
System.out.println("The device is hub");
List attachedDevices = ((UsbHub) device).getAttachedUsbDevices();
System.out.println("The attached devices size:"+attachedDevices.size());
for (int i=0; i<attachedDevices.size(); i++){
traverse((UsbDevice) attachedDevices.get(i));
if(attachedDevices !=null){
for(int j=0;j<attachedDevices.size();j++){
System.out.println("The device is"+attachedDevices.get(j));
else{
// This is a USB function, not a hub.
// Do something.
System.out.println("The device is not hub");
public static void testIO(UsbDevice device) throws UsbClaimException, UsbNotActiveException, UsbDisconnectedException, UsbException{
System.out.println("Iam in testIO");
try{
// Access to the active configuration of the USB device, obtain
// all the interfaces available in that configuration.
UsbConfiguration config = device.getActiveUsbConfiguration();
List totalInterfaces = config.getUsbInterfaces();
System.out.println("The Total interfaces: "+totalInterfaces.size());
// Traverse through all the interfaces, and access the endpoints
// available to that interface for I/O.
for (int i=0; i<totalInterfaces.size(); i++){
interf = (UsbInterface) totalInterfaces.get(i);
System.out.println("The interfaces are "+totalInterfaces.get(i));
String strinf=interf.getInterfaceString();
System.out.println("Claimed Status: "+interf.isClaimed());
System.out.println("Active status : "+interf.isActive());
System.out.println("Settings :"+interf.getNumSettings());
//interf.release();
interf.claim();
List totalEndpoints = interf.getUsbEndpoints();
for (int j=0; j<totalEndpoints.size(); j++){
// Access the particular endpoint, determine the direction
// of its data flow, and type of data transfer, and open the
// data pipe for I/O.
UsbEndpoint ep = (UsbEndpoint) totalEndpoints.get(i);
int direction = ep.getDirection();
int type = ep.getType();
UsbPipe pipe = ep.getUsbPipe();
pipe.open();
// Perform I/O through the USB pipe here.
pipe.close();
interf.release();
} catch (Exception e) {
System.out.println("Exception in TestIO"+e.getMessage());
e.printStackTrace();
}When i execute the above code i get the following exception
Exception in TestIOCannot claim an interface on a virtual root hub.
javax.usb.UsbException: Cannot claim an interface on a virtual root hub.
at com.ibm.jusb.VirtualRootUsbHubImp$VirtualRootUsbInterfaceOsImp.claim(VirtualRootUsbHubImp.java:143)
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)
at USBReader.main(USBReader.java:15)iam not getting the clue for it .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.
-
Problem with reading data from screen and inserting in table
hi ther,
im new to abap-webdyn pro. can anyone suggest how to read data from screen and insert into table when press 'ADD' button.
i done screen gui , table creation but problems with action. what the content of acton add.
is ther any link that helps me or tut??
thankx in advance!
regardsHi,
Create a context node for the screen fields for which you want to enter the values with cardinality 1.1.....
Now in the layout of your view bind the screen input fields to that context node(attributes) to the value property of the input fields...
Now in the action of ADD button....
--> go the wizard and select the read node button and select the node which you have created it generates the auto code for you.....
for example if the node is contains aone attribute like MATNR
reading the node from wizard will generate the code as....
DATA lo_nd_matnr TYPE REF TO if_wd_context_node.
DATA lo_el_matnr TYPE REF TO if_wd_context_element.
DATA ls_matnr TYPE wd_this->element_matnr.
DATA lv_matnr TYPE wd_this->element_matnr-matnr.
* navigate from <CONTEXT> to <MATNR> via lead selection
lo_nd_matnr = wd_context->get_child_node( name = wd_this->wdctx_matnr ).
* @TODO handle non existant child
* IF lo_nd_matnr IS INITIAL.
* ENDIF.
* get element via lead selection
lo_el_matnr = lo_nd_matnr->get_element( ).
* @TODO handle not set lead selection
IF lo_el_matnr IS INITIAL.
ENDIF.
* get single attribute
lo_el_matnr->get_attribute(
EXPORTING
name = `MATNR`
IMPORTING
value = lv_matnr ).
here the variable lv_matnr will contain the entered value......
now you can use this value for further process.
Thanks,
Shailaja Ainala. -
Problem while reading data from AL11
Hi Experts,
I am using OPEN DATASET
READ DATASET
CLOSE DATASET to read data from the application sever. In application sever the file type is .CSV. So after reading data from application layer(AL11) to a text variable, using statement ' SPLIT AT ',' ' all the values passing into correspoding internal table fields. And it getting updated successfully into DB also.
In above scenario my question is, if aquantity figure with coma seperator( 95,000,000.000), then while SPLIT it's creating problem. Same case in .XLS file, it will be created # seperator in the application layer. if any field having # then it will create problem again.
So can anybody suggest how can we over come the problem. Or is there any other way to read data properly from application layer(AL11)?
Thanks and regards,
Phani.to overcom this problem,
normally we use tab as sparator
so use CL_ABAP_CHAR_UTILITIES=>VERTICAL_TAB to separate your fields!
grx
Andreas
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