Tranfering data to LabVIEW through TCP/IP

Dear all,
Hello! I am a new LabVIEW user. What i am trying to do is to transfer
data from one computer running a commercial package, to a remote
computer running LabViEW, through TCP/IP. To do that i developed a
simple LabVIEW code, which establishes a connection first and then
tries to read data. The connection seems to work, but i get no data.
After the first TCPread i placed an indicator, to check if data is
transfered, where i am getting the message "nect"...any ideas on what
this could mean?
Any help would be more than welcome!Thank you in advance!
Ferrari

I don't think we have enough information to troubleshoot this issue from your description, because there is a nearly infinite number of possibilities to "transfer data via TCP/IP". What kind of "commercial software" is the server you are trying to contact? Is it LabVIEW based? What are the specifications to transfer the data? Are you trying to use low-level TCP or e.g. datasocket?
LabVIEW Champion . Do more with less code and in less time .

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NI vision 8.6
vision acquisition 2009
robot reference
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http://www.surveyor.com/SRV_info.html
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You do realize that you are not actually reading any data, don't you? Your input to the TCP Read VI is the default which is a value of 0. So in essence you are saying read nothing. Also from reading through some of the information you pasted it appears that the video is streamed via a web browser. There simply reading from a TCP port will not accomplish what you want. Do you have the Interent Toolkit? That has an HTTP protocol implementation which may work for you though I don't think it will have what you want. It looks like you need to send an HTTP GET to retrieve the video image. You could also try using ActiveX or .Net to embed a browser window in your application.
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Passing data through TCP/IP

Hello ! My challenge is this: I have a vi that i have to use as a server and a vi as a client. In the server vi, i want to modify multiple parameters of one graph and these modifications should reflect on the client vi. How can i transmit, through TCP/IP, the modified graph to the client vi/application ? I would appreciate very much a link or a example vi that can show me exactly how such an opperation can be achieved. Thank you!

You can make the string you pass include any data. Here is a simple example using an XML string.
<Graph>
<Value>1,2,3,4,5,6</Value>
<Visible>True<\Visible>
</Graph>
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Paul Falkenstein
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Receiving data through TCP Socket

Hi all,
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=============================================================================
<?xml version="1.0" encoding="utf-8"?>
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dispatcher.addEventListener(DataEvent.DATA, dataHandler);
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ioErrorHandler);
dispatcher.addEventListener(ProgressEvent.PROGRESS,
progressHandler);
dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR,
securityErrorHandler);
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trace("ioErrorHandler: " + event);
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trace("progressHandler loaded:" + event.bytesLoaded + "
total: " + event.bytesTotal);
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securityErrorHandler(event:SecurityErrorEvent):void {
trace("securityErrorHandler: " + event);
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trace("dataHandler: " + event);
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]]>
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dataProvider="{xml}">
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<mx:Array>
<mx:DataGridColumn headerText="Event Name"
dataField="eventName"/>
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Hi all,
I am trying to receive some data through TCP Socket from the
server using XMLSocketClass. Ther server is responding with some
data. But I can't access this data in my application. Pls tell me
the reasons for not working of handler private function
dataHandler(event:DataEvent):void .
=============================================================================
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.collections.ArrayCollection;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.DataEvent;
import flash.events.IOErrorEvent;
import flash.net.XMLSocket;
private var socket:XMLSocket;
private var nextId:int;
private var events:ArrayCollection = new ArrayCollection();
public static var host:String = "34.234.43.97";
public static var port:Number = 8002;
public var xml:XML;
private function connectToServer():void
socket = new XMLSocket();
socket.addEventListener(DataEvent.DATA, dataHandler);
configureListeners(socket);
socket.connect(host, port);
//This function is Not working
private function dataHandler(event:DataEvent):void {
Alert.show("dataHandler: " + event.data);
xml = new XML(event.data);
Alert.show(xml); }
private function
configureListeners(dispatcher:IEventDispatcher):void {
dispatcher.addEventListener(Event.CLOSE, closeHandler);
dispatcher.addEventListener(Event.CONNECT, connectHandler);
dispatcher.addEventListener(DataEvent.DATA, dataHandler);
dispatcher.addEventListener(IOErrorEvent.IO_ERROR,
ioErrorHandler);
dispatcher.addEventListener(ProgressEvent.PROGRESS,
progressHandler);
dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR,
securityErrorHandler);
private function closeHandler(event:Event):void {
trace("closeHandler: " + event);
private function ioErrorHandler(event:IOErrorEvent):void {
trace("ioErrorHandler: " + event);
private function progressHandler(event:ProgressEvent):void {
trace("progressHandler loaded:" + event.bytesLoaded + "
total: " + event.bytesTotal);
private function
securityErrorHandler(event:SecurityErrorEvent):void {
trace("securityErrorHandler: " + event);
/* private function dataHandler(event:DataEvent):void {
trace("dataHandler: " + event);
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var obj:Object = new Object();
obj.id = nextId++;
obj.eventName="connect";
obj.timestamp = new Date().valueOf();
events.addItem(obj);
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var xmlvalue:String=txtData.text.toString() ;
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"<command>SndIns<parameter1>0x06</parameter1><parameter2>0x00</parameter2><parameter3>0x7 1</parameter3><parameter4>0x0F</parameter4><parameter5>0x11</parameter5><parameter6>0xFF</ parameter6></command>";
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Alert.show(xmlfile);
]]>
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<mx:Button id="btnConnect" label="Connect"
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<mx:DataGrid width="80%" height="100%"
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<mx:Array>
<mx:DataGridColumn headerText="Event Name"
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Is it possible to acquire string data from PLC through LabVIEW?

Hi All,
I am using Labview 8.6 and modbus library to communicate with a Allen Bradley PLC and exchange data. the screenshot of library and its usage is attached. the operations possible right now with this library are r/w of bits and bytes. Now there is a requirement to transfer the log table inside PLC to the labview. Using the available provisions in the library, there is no method to read the PLC memory which stores the log table. So I am left with the option of copying the log table memory into input registers and reading input registes into Labview, continuing until 128K of log data is read. But this doesnt really appear neat. Is there any other way of transferring Log table data into Labview?
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Attachments:
Modbus Library.png ‏71 KB

I had a project to communicate with omron plc with opc server.
ni opc server configration window,you can config the tag with storage address you wanted.then you can connect your labview application to plc through opc server.
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sorry for my poor english.

Data access in Teststand/LabVIEW through OPC connection

We are using TestStand 2.0 and LabVIEW6.2 and following problem occurs when accessing the datas from UUT through OPC.
For the first UUT i get the measurement datas but starting the next UUT causes a system hang up. The corresponding LabVIEW VI stops at the connect to the OPC Server it doesn't read the selected item. Only with LabVIEW there is no problem launching OPC data access for multiple times. Does anyone have expierence with this configuration: TestStand-LabVIEW-OPC?

For your information, there is a new TestStand Add-on "OPC DA Connect" which adds a StepType Palette dedicated to OPC Data Access.
You can configure each step by browsing the OPC servers on your network and browsing variables within these servers.
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Hoping this helps.
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├ CTD - Certified TestStand Developer (2004 & 2007)
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Communicate a PC with GPRS module through TCP/IP

I want to exchange data between a PC and a GPRS module.
One problem i have is that my PC is on a local network and the IP my computer has, is the local IP. The server has a different IP through we connect to the internet. Which IP I must use and how?
I know almost nothing about TCP/IP (i have use the Labview TCP/IP functions successfully at our local network) and i would like to ask for informations. I know it is a little irrelevant with Labview, but as there are many users who uses GPRS modules, i would like informations about how to connect a GPRS module through TCP/IP. Simple examples will be the best.
Any informations, links, recommended books, will be highly appreciated.
Thanks

Pnt wrote:
Thanks for answering Rolf.
To be more clear : i have a GSM/GPRS module (like the well known Wavecom's modules (or Falcom, Telit...)). They accept AT commands and they have a D-sub-9 serial connector. They connect to serial port of the PC. I want to connect to the internet with TCP/IP (by sending AT commands). But i can not find any manual..! The module have some commands for TCP/IP but no explanation or examples. Those modems have no drivers, they accept only AT commands.
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If someone knows anything similar please reply.
In that case what I wrote applies fully to you. You do not want to communicate with the modem from LabVIEW itself. You want to use TCP/IP and that means using the Windows socket library that the LabVIEW TCP/IP functions access. The modem then needs to be installed in the Windows system as a dialup adapter. There is really no other way to use a modem, GPRS or not, as TCP/IP communication path. Trying to implement TCP/IP,SLIP/PPP and all that in LabVIEW would be a many man year project with lots of problems and the likely chance that it will never fully work.
So get your modem to work under Windows so that you can use your browser to view some internet pages and once that works you can also use the LabVIEW TCP/IP functions to communicate with whatever is there.
Direct communication to the modem through AT commands would only make sense if you wanted to access the SMS facilities in that modem instead. Even that is not exactly trivial as I can attest to, especially if you want to make it work with more than one GSM modem type.
Your modem manufacturer should be able to give you the necessary modem initialisation string to put your modem into the right GPRS mode and your mobile phone network provider should be able to tell you the dialing number to fill in the dialup configuration. No need to do anything else!
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All in all it's doable but I have spent many hours to get it working last time I did. A few of those were spent waiting on the line for the support persons of the mobile network provider to answer my calls and then playing the ping pong game to get a person that actually knows what a computer is and that it's actually possible to connect a modem to it to use their services.
Rolf Kalbermatter
Message Edited by rolfk on 01-09-2008 06:06 PM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Need help : Reading from DAQ through TCP/IP ?!!

Hello
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I know it's hard to explain in words, but if anyone is interested i can
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Try running the "Remote Device Access Server" (RDA) on hte machine that has the DAQ card in it. You'll find it in NI-DAQ folder under National Instruments in your Start Menu. (guessing you're running Windows here?)
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Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

Listening multipe devices through TCP/IP Listener

Hello
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Attachments:
example prog.vi ‏25 KB

Take a look at this thread.
Mark Yedinak
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Wreck of the Edmund Fitzgerald - Gordon Lightfoot

Flatten to string for sending through TCP/IP contains CRLF characters

Hi,
I'm using a 'flatten to string' function to send some data through TCP/IP.
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I noted that every now and then only part of the data is transmitted because the flattened string itself sometimes (albeit rarely) contains CRLF characters.
I was wondering if this is correct behaviour, or if I'm missing something.I expected flatten to string to produce pure ASCII strings without special characters.
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Certified LabVIEW Developer (CLD)
Solved!
Go to Solution.

mkdieric wrote:
Hi,
thanks for the feedback. I'll use the way you describe, by first sending the number of characters to expect.
Manu
Make sure you are consistent with the format for the number of butes. That is, always use an 8, 16 or 32 bit value. Which one you use is up to you and will depend on the size of your data. A 32 bit value is the most common size to use. Anyway what I am basically saying is that if you are inconsistent with what size number you use for the size you will get inconsistent results when you read the data since you will be interpretting the size incorrectly some of the time.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

How do I read/write many matrices through TCP server?

I'm trying to modify the simple data client and the simple data server program in example in LabVIEW6i. How do I send a 2 dimension nummeric matrix? and also how do I send many numeric matrices at a time?

The problem here is that at the receiving end, one cannot know how many
bytes to read before unflattenning into the datatype.
A method that works for *any* datatype (and any data transfer mechanism):
Flatten the data to string.
Flatten again the string to string; this adds a string lenght (U32) header
to the string.
Send the string.
When receiving data, first read 4 bytes and convert to U32.
Read this number of bytes.
Typecast the string to the expected datatype.
Jean-Pierre Drolet
----- Message d'origine -----
De : "Mark Hanning-Lee"
Groupes de discussion : comp.lang.labview
Envoye : 6 septembre, 2001 22:21
Objet : Re: How do I read/write many matrices through TCP server?
> Lab Viewer wrote:
> >
> > Hi Irene,
> > Re
garding that example, probably you are wondering how can you pass a
> > 2D array to Type Cast.VI (it accept only 1D array). The answer is
> > Reshape Array.VI. Use this VI to transform your multidimensional array
> > in a 1D array (after that use Type Cast.VI to transform it in a
> > string). Also, you can use Array To Spreadsheet String.VI in order to
> > obtain a string to send via TCP, but in this case the string is
> > longer.
>
> Or better, wire the 2D array to the Flatten to String function, which
> accepts any data type.
>
> When you receive the data, wire the string into the Unflatten from
> String function. You'll need to wire a 2D array of the same
> representation into the type input of that function.
>
> Mark
LabVIEW, C'est LabVIEW

Flexiable Communication through TCP/IP or RS-485 using VISA

I am trying to create a flexiable distributed application that can communicate over RS-485 or TCP/IP visa. The application has a basic Host / Client(Listener) type of Architecture. What I would like to be able to do is simply to change my Visa resource name from [Com4] to [TCP::192.168.1.10::3000::socket] and seemlessly change communication protocals. The problem I am running into is creating a flexiable visa listener. I tried using the visa events vi's, but I don't know what the syntax of the visa string should be. Any thoughts or clarifing questions would be apprecaited.

Hi,
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For example:
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Tranfering data to LabVIEW through TCP/IP

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