Acquiring Data

Greetings,
I'm trying to acquire data from 2 (In the future 3) Analog Input channels. I'm doing this using DAQ assistant.
But I'm running into an error.. I've tried some things, but nothing seems to work. Tried changing the sampling rate and such.
I've added an image of the scheme and error involved.
Thanks in advance!
Solved!
Go to Solution.
Attachments:
Meting2.png ‏50 KB

Yes, I have found the solutions when I searched for the error.
But the problem is that I want to use multiple DAQ Assistants because I want to show the signals on different graphs.
I'm not quite sure how I could do that with only 1 DAQ Assistant

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OSB: Cannot acquire data source error while using JCA DBAdapter in OSB

Hi All,
I've entered 'Cannot acquire data source' error while using JCA DBAdapter in OSB.
Error infor are as follows:
The invocation resulted in an error: Invoke JCA outbound service failed with application error, exception: com.bea.wli.sb.transports.jca.JCATransportException: oracle.tip.adapter.sa.api.JCABindingException: oracle.tip.adapter.sa.impl.fw.ext.org.collaxa.thirdparty.apache.wsif.WSIFException: servicebus:/WSDL/DBAdapter1/RetrievePersonService [ RetrievePersonService_ptt::RetrievePersonServiceSelect(RetrievePersonServiceSelect_inputParameters,PersonTCollection) ] - WSIF JCA Execute of operation 'RetrievePersonServiceSelect' failed due to: Could not create/access the TopLink Session.
This session is used to connect to the datastore.
Caused by Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.0.2.v20100323-r6872): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [jdbc/soademoDatabase].
Internal Exception: javax.naming.NameNotFoundException: Unable to resolve 'jdbc.soademoDatabase'. Resolved 'jdbc'; remaining name 'soademoDatabase'.
; nested exception is:
BINDING.JCA-11622
Could not create/access the TopLink Session.
This session is used to connect to the datastore.
JNDI Name for the Database pool: eis/DB/soademoDatabase
JNDI Name for the Data source: jdbc/soademoDatabase
I created a basic DBAdapter in JDeveloper, got the xsd file, wsdl file, .jca file and the topLink mapping file imported them into OSB project.
Then I used the .jca file to generate a business service, and tested, then the error occurs as described above.
Login info in RetrievePersonService-or-mappings.xml
<login xsi:type="database-login">
<platform-class>org.eclipse.persistence.platform.database.oracle.Oracle9Platform</platform-class>
<user-name></user-name>
<connection-url></connection-url>
</login>
jca file content are as follows:
<adapter-config name="RetrievePersonService" adapter="Database Adapter" wsdlLocation="RetrievePersonService.wsdl" xmlns="http://platform.integration.oracle/blocks/adapter/fw/metadata">
<connection-factory location="eis/DB/soademoDatabase" UIConnectionName="Connection1" adapterRef=""/>
<endpoint-interaction portType="RetrievePersonService_ptt" operation="RetrievePersonServiceSelect">
<interaction-spec className="oracle.tip.adapter.db.DBReadInteractionSpec">
<property name="DescriptorName" value="RetrievePersonService.PersonT"/>
<property name="QueryName" value="RetrievePersonServiceSelect"/>
<property name="MappingsMetaDataURL" value="RetrievePersonService-or-mappings.xml"/>
<property name="ReturnSingleResultSet" value="false"/>
<property name="GetActiveUnitOfWork" value="false"/>
</interaction-spec>
</endpoint-interaction>
</adapter-config>
RetrievePersonService_db.wsdl are as follows:
<?xml version="1.0" encoding="UTF-8"?>
<WL5G3N0:definitions name="RetrievePersonService-concrete" targetNamespace="http://xmlns.oracle.com/pcbpel/adapter/db/KnowledeMgmtSOAApplication/AdapterJDevProject/RetrievePersonService" xmlns:WL5G3N0="http://schemas.xmlsoap.org/wsdl/" xmlns:WL5G3N1="http://xmlns.oracle.com/pcbpel/adapter/db/KnowledeMgmtSOAApplication/AdapterJDevProject/RetrievePersonService" xmlns:WL5G3N2="http://schemas.xmlsoap.org/wsdl/soap/">
<WL5G3N0:import location="RetrievePersonService.wsdl" namespace="http://xmlns.oracle.com/pcbpel/adapter/db/KnowledeMgmtSOAApplication/AdapterJDevProject/RetrievePersonService"/>
<WL5G3N0:binding name="RetrievePersonService_ptt-binding" type="WL5G3N1:RetrievePersonService_ptt">
<WL5G3N2:binding style="document" transport="http://www.bea.com/transport/2007/05/jca"/>
<WL5G3N0:operation name="RetrievePersonServiceSelect">
<WL5G3N2:operation soapAction="RetrievePersonServiceSelect"/>
<WL5G3N0:input>
<WL5G3N2:body use="literal"/>
</WL5G3N0:input>
<WL5G3N0:output>
<WL5G3N2:body use="literal"/>
</WL5G3N0:output>
</WL5G3N0:operation>
</WL5G3N0:binding>
<WL5G3N0:service name="RetrievePersonService_ptt-bindingQSService">
<WL5G3N0:port binding="WL5G3N1:RetrievePersonService_ptt-binding" name="RetrievePersonService_ptt-bindingQSPort">
<WL5G3N2:address location="jca://eis/DB/soademoDatabase"/>
</WL5G3N0:port>
</WL5G3N0:service>
</WL5G3N0:definitions>
Any suggestion is appricated .
Thanks in advance!
Edited by: user11262117 on Jan 26, 2011 5:28 PM

Hi Anuj,
Thanks for your reply!
I found that the data source is registered on server soa_server1 as follows:
Binding Name: jdbc.soademoDatabase
Class: weblogic.jdbc.common.internal.RmiDataSource_1033_WLStub
Hash Code: 80328036
toString Results: ClusterableRemoteRef(8348400613458600489S:10.2.1.143:[8001,8001,-1,-1,-1,-1,-1]:base_domain:soa_server1 [8348400613458600489S:10.2.1.143:[8001,8001,-1,-1,-1,-1,-1]:base_domain:soa_server1/291])/291
Binding Name: jdbc.SOADataSource
Class: weblogic.jdbc.common.internal.RmiDataSource_1033_WLStub
Hash Code: 92966755
toString Results: ClusterableRemoteRef(8348400613458600489S:10.2.1.143:[8001,8001,-1,-1,-1,-1,-1]:base_domain:soa_server1 [8348400613458600489S:10.2.1.143:[8001,8001,-1,-1,-1,-1,-1]:base_domain:soa_server1/285])/285
I don't know how to determine which server the DBAdapter is targetted to.
But I found the following information:
Under Deoloyment->DBAdapter->Monitoring->Outbound Connection Pools
Outbound Connection Pool Server State Current Connections Created Connections
eis/DB/SOADemo AdminServer Running 1 1
eis/DB/SOADemo soa_server1 Running 1 1
eis/DB/soademoDatabase AdminServer Running 1 1
eis/DB/soademoDatabase soa_server1 Running 1 1
The DbAdapter is related to the following files:
C:\ Oracle\ Middleware\ home_11gR1\ Oracle_SOA1\ soa\ connectors\ DbAdapter. rar
C:\ Oracle\ Middleware\ home_11gR1\ Oracle_SOA1\ soa\ DBPlan\ Plan. xml
I unzipped DbAdapter.rar, opened weblogic-ra.xml and found that there's only one data source is registered:
<?xml version="1.0"?>
<weblogic-connector xmlns="http://www.bea.com/ns/weblogic/90">
<enable-global-access-to-classes>true</enable-global-access-to-classes>
<outbound-resource-adapter>
<default-connection-properties>
<pool-params>
<initial-capacity>1</initial-capacity>
<max-capacity>1000</max-capacity>
</pool-params>
<properties>
<property>
<name>usesNativeSequencing</name>
<value>true</value>
</property>
<property>
<name>sequencePreallocationSize</name>
<value>50</value>
</property>
<property>
<name>defaultNChar</name>
<value>false</value>
</property>
<property>
<name>usesBatchWriting</name>
<value>true</value>
</property>
<property>
<name>usesSkipLocking</name>
<value>true</value>
</property>
</properties>
          </default-connection-properties>
<connection-definition-group>
<connection-factory-interface>javax.resource.cci.ConnectionFactory</connection-factory-interface>
<connection-instance>
<jndi-name>eis/DB/SOADemo</jndi-name>
          <connection-properties>
               <properties>
               <property>
               <name>xADataSourceName</name>
               <value>jdbc/SOADataSource</value>
               </property>
               <property>
               <name>dataSourceName</name>
               <value></value>
               </property>
               <property>
               <name>platformClassName</name>
               <value>org.eclipse.persistence.platform.database.Oracle10Platform</value>
               </property>
               </properties>
          </connection-properties>
</connection-instance>
</connection-definition-group>
</outbound-resource-adapter>
</weblogic-connector>
Then I decided to use eis/DB/SOADemo for testing.
For JDeveloper project, after I deployed to weblogic server, it works fine.
But for OSB project referencing wsdl, jca and mapping file from JDeveloper project, still got the same error as follows:
BEA-380001: Invoke JCA outbound service failed with application error, exception:
com.bea.wli.sb.transports.jca.JCATransportException: oracle.tip.adapter.sa.api.JCABindingException: oracle.tip.adapter.sa.impl.fw.ext.org.collaxa.thirdparty.apache.wsif.WSIFException: servicebus:/WSDL/DBAdapterTest/DBReader [ DBReader_ptt::DBReaderSelect(DBReaderSelect_inputParameters,PersonTCollection) ] - WSIF JCA Execute of operation 'DBReaderSelect' failed due to: Could not create/access the TopLink Session.
This session is used to connect to the datastore.
Caused by Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.0.2.v20100323-r6872): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [jdbc/SOADataSource].
Internal Exception: javax.naming.NameNotFoundException: Unable to resolve 'jdbc.SOADataSource'. Resolved 'jdbc'; remaining name 'SOADataSource'.
; nested exception is:
BINDING.JCA-11622
Could not create/access the TopLink Session.
This session is used to connect to the datastore.
Caused by Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.0.2.v20100323-r6872): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [jdbc/SOADataSource].
Internal Exception: javax.naming.NameNotFoundException: Unable to resolve 'jdbc.SOADataSource'. Resolved 'jdbc'; remaining name 'SOADataSource'.
You may need to configure the connection settings in the deployment descriptor (i.e. DbAdapter.rar#META-INF/weblogic-ra.xml) and restart the server. This exception is considered not retriable, likely due to a modelling mistake.
It almost drive me crazy!!:-(
What's the purpose of 'weblogic-ra.xml' under the folder of 'C:\Oracle\Middleware\home_11gR1\Oracle_OSB1\lib\external\adapters\META-INF'?
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How to acquire data from multiple dataports at the same time

Hi,
I studied the multithreading section of Labview, but still have no idea
how to make it work. Let me briefly explain my situation. I need to
develop a program that can control and acquire data from 4 serial
ports. I have 4 buttons to control starting or stopping acquisation
from the corresponding port. Every acquisation process is a while loop.
How can I start a new acquisation loop (eg. from COM2) while the loop
for COM1 is still running? In other words, I wish the 4 loops running
independently, and are controlled by their corresponding buttons only.
Thanks for any suggestion.
Jin

Hi Anonymous,
If I were you, I'd create one VI (call it Port.vi) to listen to one port - then make it reentrant. Drop 4 copies of Port.vi on your Main diagram. Port.vi inputs could include a VISA reference, a "Start/Stop" notifier and maybe a "Quit" occurance. Wire to each copy of Port.vi a unique VISA reference and a unique "Start/Stop" [boolean] notifier - let all the copies share the same Quit Occurance.
In Main, have one event case for each of your stop buttons. When a button is pressed, send the appropriate Start/Stop notifier!
... of course you could accomplish the same thing with four identical loops right in your main diagram, but the more complex the port-handling gets, the easier it will be to manage in one place instead of four.
Cheers!
When they give imbeciles handicap-parking, I won't have so far to walk!

How to acquire data through multiple channels in parallel using PXI 6070 E, PXI 4071 and LabVIEW?

Hi,
I am using NI LabVIEW, NI PXI 4071, and NI PXI 6070E to measure current through a variable resistance. Now, I am using one channel from SCB-68, but I want to add another channel in parallel so that I can have two resistors instead of one that I cam measure current through them.
I have attached a Pdf file showing the setup for hardware in use and LabVIEW code also.
Can anyone look at these files and give me guide lines or ideas that can help me resolving this issue, please.
Thanks in advance.
Best Regards,
Shaheen.
Solved!
Go to Solution.
Attachments:
IV copy for HS.vi ‏55 KB
Layout of NI Cards.pdf ‏248 KB

Your 4071 can only do one measurement at a time. Your DAQ cannot measure resistance either nor has it got any analogue inputs.
However, you could use a multiplexer and multiplex your 4071 DMM. This wont give you simultaneous measurements but can acquire data one after the other, the speed is obviously dependent on the multiplexer you choose!
Hope this helps.
Beginner? Try LabVIEW Basics
Sharing bits of code? Try Snippets or LAVA Code Capture Tool
Have you tried Quick Drop?, Visit QD Community.

How to acquire data from 2 chs of the same DAQ card at different sampling rate

I am using single DAQ card (either 6013 or 6014) in my system i want to acquire data from 2 (or more) channels with following requirements
1. sampling rate of each channel should be independant of each other (say one is 20 Hz and other is 15 kHz)
2. data from all the channels should be acquired simultaneously.
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can somebody help me out to solve this problem.
i will appreciate if somebody can post the sample code as my deadline is approaching
Tushar Jambhekar
[email protected]
Jambhekar Automation Solutions
LabVIEW Consultancy, LabVIEW Training
Rent a LabVIEW Developer, My Blog

Hi Dennis Knutson
Thanks for your suggestion.
Tushar Jambhekar
[email protected]
Jambhekar Automation Solutions
LabVIEW Consultancy, LabVIEW Training
Rent a LabVIEW Developer, My Blog

Acquiring data continuously with a start and stop trigger

I am currently acquiring data continuously (1000 samples at 5k/s) using a start trigger to start the acquisition and stopping the acquisition with a digital line. The problem with this is that I want the acquisition to stop immediately on a trigger, in otherwords I don't want it to finish with 500 or 200 samples of useless data. I am using a PCI 6024 E. Any suggestions would be appreciated.

The trick will be to minimize the number of post-trigger scans that will occur after your stop trigger. The stop (reference) trigger requires a minimum of 2 post-triggered scans. Therefore, the way to stop your acquisition as soon as possible is to configure your stop trigger to have only 2 post-triggered scans.
I've included a little bit of code to illustrate this in LabVIEW 7.0. The number of post-trigger scans will equal the buffer size less the number of pre-trigger scans. Since the minimum number of post-triggered scans is 2, we'd have to set the number of pre-trigger scans to the buffer size less 2. This is wired as the minimum number of pre-trigger scans acquired input to the AI Control.vi in the example.
This should do what you're
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Attachments:
example.vi ‏85 KB

Acquiring data from all the analog channels of NI-3202 NODE using a single sensor

Hi all,
I would like to know that can i be able to get the data from all the four analog channels of NI-WSN node 3202(analog input node) connecting only single sensor on the analog input and connecting all the remaining analog inputs using wires and also shorting the ground pins corresponding to each analog input pin.
By configuring the each channels like 0.5 sec delay for every analog channels to acquire data. can we get the sensor data from all the channels by doing this. basically here i am trying to increase the minimum sampling rate of the ni-wsn NODE 3202 which is 1s.
I this approach is correct or we cannot do this.
Thanks

Stefan,
In terms of differential and RSE, channels 0-8 should default to differential when using test panels. Differential needs two input channels to function correctly and these channels must be spread apart by 8 channels. (i.e channels 0 and 7 are a differential pair) Channel 13, on the other hand, will default to rse if chosen as the reading channel because there does not exist another channel that is eight away. I am not quiet sure if the virtual channels will default channel 5 into being differential but I will check into it. If it is differential as default then you may run into problems since channel 13 is utilized in both strain gauge reads.
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If you are referring to "voltage" as acquiring a signal with custom voltage with exciation then I would reccomend using example in LabVIEW called Acq Wheatstone Bridge Samples (with Calibration). This can be found by navigating to LabVIEW's example finder and expanding Hardware Input and Output>>DAQmx>>Analog Measurements>>Strain.
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SCC Tutorial Series: SCC-SG0x
SCC Example Series: SCC-SG0x
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Thanks,
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Conditionally capturing certain data while continuously acquiring data

In case my question has totally confused you, let me describe the situation, a general one which I'm sure some of you have already tackled.
Suppose you're acquiring data from several channels (let's say two waveforms). And you only want to capture their amplitudes (Y1, Y2,etc.) when either a button is pushed (i.e., things are steady state, now grab that data) or when something else has changed a certain amount (say their frequency has changed 2 Hz).
When I say "capture", I simply mean grabbing the data into a separate array of X,Y values for later processing or on-line plotting while still acquiring data.
Hopefully, this makes sense. Would greatly appreciate any thoughts on this, as it's a
situation that I seem to run into often.
All the best, Hunter

Your use of the terms "Waveforms" and "amplitude" implies a measurement of many samples into one number (for each channel).
For example, if your signal was pure 100 Hz, 1.000 Volts peak, and you captured a 0.1 second block of that signal, then you would have 10 cycles in the capture buffer, varying from +1V to -1V. You can use the RMS function to turn that block of samples into a number of 0.707, meaning the RMS value is 0.707V (= 1.0 V peak).
The basic philosophy would be:
1... Start a continuous acquisition. By specifying NUMBER oF SAMPLES = 0 in the AI-START vi, you will acquire data forever (until the buffer overflows, or until stopped).
2... Periodically (based on a timer), you ask the AI READ function to read zero samples. This does not remove data, but it does tell you how many samples are in the buffer.
3... You immediately read that many samples out of the buffer, and convert from volts to engineering units (if appropriate).
4... If you are measuring their frequency, you need to perform an FFT now. The highest peak in the magnitude of the FFT output is the dominant frequency in the signal. (Freq. of peak = Index of peak * Sample Rate / NPoints in block.
5... If you are doing FFTs, you get a big speed advantage if your block size is a power of two (128, 256, 512, 1024, etc.). If so, then replace step 3 with *-IF-* backlog >= N (power of 2) then read N points from buffer.
6... Apply your criteria - *-IF-* the button has been pressed, *-OR-* if the frequency of channel 2 is different, then compute the RMS or peak values and append to your final results array. Otherwise do nothing.
If you want to detect 2-Hz changes, you need to know the rules of how FFTs work - the frequency resolution is the BIN WIDTH, which equals the sample rate divided by the number of points in the block. If you have a 1000 Hz sample rate and a 1024 point block, your resolution is 1000 / 1024 or just less than 1 Hz. But if you have a 1000 Hz sample rate and a 32 point block, your resolution is 1000 / 32 or about 30 Hz.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Not enough memory issue while acquiring data

Hi all,
I am trying to acquire audio data @ 50KS/s for 20 sec. using the PXI 4498 card in the PXI system. To acquire data I am using the DAQmx functions.
Step1 : Created DAQmx channel
Step2: Set the no. of sample to read as 20X50=1000000 to the DAQmx Timing function
Step3: DAQmx Read funtion to read the data. (Set the timeout as 20x2=40Seconds)
PLease find the attached screen shot of the block diagram.
Issue is sometimes I am facing the memory issue when I run this VI. Popup saying that "Not enough memory to complete this Operation" is getting popup and the Vi getting stop abruptly. Kinldy look into the screen shot and suggest me the apprapriate method to read the data at mentioned acquisition rate.
Note: The problem is not consistent. Sometimes I am facing the error and sometimes not.
Thanks in advance
Giridhar
Attachments:
Block diagram.jpg ‏208 KB

I think actdi is talking about loading an external database directly from the XML file using the jdbc XML driver, correct? I have not tried this yet, but am curious as to the results.
http://docs.oracle.com/cd/E17904_01/integrate.1111/e12644/appendix_xml_driver.htm#CHDFIJEH
Hope this works.
Enjoy!
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I built a DAQ vi in the labview6.1 and i compiled it to a dll.And then I wanted to call it and expected it pass acquired data to visual c++

I built a DAQ vi in the labview6.1 to acquire four channels'data(use pci_6110E) .And i compiled it to a dll.I wanted to use visual c++ to call it and expected it pass acquired data to visual c++.

Hello
If you are using Visual C++, then I would recommend using the NI-DAQ function calls instead of having labview layer in there. YOu can pretty much accomplish any task using the NI-DAQ function calls that you can by using the LabVIEW DAQ vi's. Plus this way you wont have to worry about passing the correct data type from LabVIEW into C++. You can find the examples for using these function calls under ../NI-DAQ/Examples/.
I hope this helps
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NI
Bilal Durrani
NI

Code for acquiring data not working like i'd expect

Hello everyone. I posted my code that collects voltages from an NI 9215 DAQ card. I'm wondering why it acts so interestingly. For instance, at frequencys that are multiples of ten the waveform graph is frozen in place, and at lower frequencys (2-3 Hz) the data is changing faster rather than slower. Take a look! I'd like any input you have.
Attachments:
Voltage Reader that displays increasing voltages.vi ‏23 KB

You are acquiring 10,000 samples at a rate of 100,000 samples per second. So you are acquiring data 10 times per second. If you acquiring signals that are a multiple of 10 Hz, then you are gathering integral number of cycles and it will look stationary on your waveform graph.
If you are looking at frequencies that are not a multiple of 10, or less than 10 Hz, then you are getting fractional or incomplete cycles in any given capture, and it will look like your sine wave is walking across the graph.

I want to export acquired data via XML to a remote URL/web service. Is there some online reference for EXACTLY what XML features are available in 6.1?

Is there any online reference to the XML methods available in 6.1?
I would like to set up a LabView system that acquires data from local hardware, and then sends acquired data as XML "packets" to a remote web service. I can't seem to find any online reference to this when I search the site. I don't want the "gee golly 6.1 is cool" marketing stuff. Just a simple technical reference to abilities.

If you're looking for more technical information about all the new features of 6.1, try the LabVIEW 6.1 Upgrade Notes. Here's what they say about the XML functions:
"Use the Flatten to XML function located on the Functions»Advanced»Data Manipulation palette to convert any LabVIEW data type to the XML format according to the LabVIEW XML schema. Use the Unflatten from XML function located on the same palette to convert a data type in the XML format into LabVIEW data.
For these conversions, LabVIEW uses a predefined XML schema that is described in labview\help\LVXMLSchema.xsd."
Kelly Holmes
LabVIEW Documentation
Kelly H
LabVIEW Documentation
National Instruments

Write acquire data time to file

Hi
I attached my TIME.VI. another vi is sub vi. Sub vi is read real time using second unit.
I just try to read time for acquiring data.
When I pressed acquire data button, I hope time can begin from 0 then written in file. Right now , my program is not from zero.
Thank you for your help.
Hope you can help me check my vi.
Attachments:
time.vi ‏28 KB
abstime-subvit.vi ‏25 KB

I'm still confused.
Are you saying you want your time 0 to be the moment you hit the acquire button as opposed to the time the VI starts?
If so, you need to take the time when the acquire button first turns true and store that in a shift register to subtract from future times as opposed to using the value coming in from the tunnel that is taken when the VI first starts.
Message Edited by Ravens Fan on 05-28-2010 04:00 PM

Acquire date from agilent dso3104 in avraging mode

hi
i am trying to acquire data from agilent dso 3104 x in labview . when i configure my dso in normal mode it is acquiring data but when i configure my dso in avraging mode it is not acquiring data on lab view

I am running labview code for DSO "Agilent 2000 3000 X series" (downloaded from http://forums.ni.com/ni/attachments/ni/140/47325/1/agilent_2000_3000_x-series.zip). VI examples: "acquire waveform single" / "acquire waveform continuously", but it only acquires in normal mode. whenever i change to average mode manually or through "configure acquisition" VI, i get the same error message: No data for operation on PC as well as oscilloscope and Query unterminated.
Pl find attached the error message.
If i run "read current waveform" VI , even then , averaging mode is not being supported.
I have not changed the default time out values in the default VI's or sub VI's. Pl advise on what values to take for sampling in 5Gsa/sec and averaging mode in 256 samples DSO setup.
Attachments:
error.jpg ‏40 KB

Acquiring data from instruments and wiring it to a while loop

Hello,
I am very new to labVIEW and was thrown into a project. Essentially what I am trying to accomplish is to acquire data from my four sensors and use that data to compute drag. In order to compute the drag, an initial guess at what the drag is must be given and then calculations are carried out in a while loop that converges on a solution once the difference between the current drag output and the previous drag estimate falls below a certain percentage. I am continuously acquiring data so I need some sort of way to incoporate a timer to allow time for the while loop to converge and then output the drag value. Right now I am generating a signal since I do not have the sensors hooked up and labVIEW will not let me connect the signal generator to the while loop and gives me an error that I have connected two terminals of different types.
If I could figure out how to wire my DAQ assistants to the while loop I could figure everything else out
Thank You,
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Hi Ellen,
I might need a little more information before I can help you. How are you simulating your signals? If you're using the DAQ assistant express VI, are you simulating hardware in MAX? Or are you using the simulate signal express VI?
Alos, what VIs or functions do you have inside the while loop that you are trying to connect to?
Perhaps posting a screenshot would be useful. I'm sure we will be able to solve your problem.
Here is a help page that you might find useful.
http://zone.ni.com/devzone/cda/tut/p/id/4656
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Exception thrown while trying to acquire data from Profile Data Control

I created a new WebCenter Portal Application (with JDeveloper 11.1.1.4).
Then tried to acquire data from Profile Data Control through getProfile().WCUserProfile to create a read-only form with profile data.
After deploying (to internal WLS) and running I got a popup saying:
*Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.1.2.v20101104-r8475): org.eclipse.persistence.exceptions.ValidationException Exception*
Description: Cannot acquire data source [java:comp/env/jdbc/WebCenterDS].
Internal Exception: javax.naming.LinkException: [Root exception is javax.naming.NameNotFoundException: While trying to lookup 'jdbc.webcenter.CustomPortalDS' didn't find subcontext 'webcenter'. Resolved 'jdbc'; remaining name 'webcenter/CustomPortalDS']; Link Remaining Name: 'jdbc/webcenter/CustomPortalDS'
The question is how can I create such a data source to acquire data needed?

Hi, there's two ways, in both ways you need use the user <PRE>_WEBCENTER that RCU create.
1 - You can go in your console and create de dataSource, as Yannick sad. You can use your production database if you want get some more real tests, or you can get some develope database and run RCU. You can copy the configuration from you WLS server that are installed webcenter to make this easy.
2 - In develop mode you can just create a database connection name "WebCenter", just like sad here:
http://download.oracle.com/docs/cd/E17904_01/webcenter.1111/e10148/jpsdg_people.htm#BABICGCH

Acquiring Data

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