How do i deal while acquiring data unsing ni9237

Hi everybody, I created under matlab a code that acquire data from four gauges fixed to a beam using NI9237, the aim of my code is to estimate the applied force to the beam, my problem is that at the in the end of acquisition i get the expected force devided by 10(7000N rather than 70000), i am pretty sure that the problem comes form the NIdevice, does any one of you have a suggestion?
Yours Faithfully

This is not a new idea for data acquisition and doesn't belong in the Idea Exchange. It is a regular problem asking for help.
It belongs in the Multifunction DAQ board.
I'll ask to have it moved.

Similar Messages

How do i deal while acquiring data rising ni9237

Hi everybody,
I created under matlab a code that acquire data from four gauges fixed to a beam using NI9237, the aim of my code is to estimate the applied force to the beam, my problem is that at the in the end of acquisition i get the expected force devided by 10(7000N rather than 70000), i am pretty sure that the problem comes form the NIdevice, does any one of you have a suggestion?
Yours Faithfully.

Hello ismailel,
You can test your device using NI MAX by following this tutorial:
http://www.ni.com/tutorial/4638/en/
Last version of MAX:
http://www.ni.com/download/ni-system-configuration-14.5.0/5158/en/
Best regards,

How Oracle to deal with the data lose?-----QNo.104

In incomplete recovery,some data will be lost. How Oracle to deal with it?
For example, at 9:00am, you find that it is a mistake to drop a user(you dropped it at 8:30am). But other users' transactions are in progress. A lot of data is input between 8:30 and 9:00. If decide to make a incomplete recovery, does this means all the data input between 8:30 and 9:00 will be lost?
Message was edited by:
frank.qian
Message was edited by:
frank.qian

For example, at 9:00am, you find that it is a mistake to drop a user(you dropped it at 8:30am. But the transactions are in progress. To make you clear, you can't drop the user while session connected to this schema.
I dont think that you would loose any data.
The other workaround for this issue would be,
I would clone this on other server just before the user dropped, take the export and then import the user in the production.
Is this satisfy your question?
Jaffar

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!
Michael R.

How can I display a avi-file while acquiring data from a DAQ-CARD at the same time

While my system is acquiring analog data and controlling a motor, I want to display a avi-film (preferably in full-screen, so that the LabView GUI disapears during this process). Are there any VI's to open external players? May I face some problems to lose samples, due to the calling of external players?

mhi wrote in message news:<[email protected]>...
> I've already found this example, but it doesn't work with the latest
> media-player. Anyhow, thank you for your answer!
you can also try out this free vi from my website:
http://www.geocities.com/irene_he/FunStuff.html
Irene

How to increase speed while retrieving data from tableand showing it in pop

Hi,
In one form ,I have used f9 key to retrieve data from table in oracle database . i.e. in any input field in my form, once I press f9 key, it execute JavaScript windows. Open command.
In that command, I called the servlet which retrieves nearly 7000 rows data from table and then it dispatch request to another jsp page which shows the related data in tabular form. The data may contain nearly 7000-8000 rows.
So when I press the f9 keys it takes around 10-12 second to open the page.
Is there any ways to open this pop up windows within 2-3 second once I hit the f9 keys.
Here with I am attaching hole code for servlet and jsp page.
Any suggestion is highly appreciated.
Thanks and Regards
Harshal
try { Class.forName("oracle.jdbc.OracleDriver"); connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:bmltest","system","manager"); st = connection.createStatement(); String query = ""; if(find == null){ query = "SELECT A1.ITEMNAME,A1.TECHDESC, A1.ITEMCODE,SUBSTR(A1.MUNITCODE,1,3),A1.MUNITCODE FROM CMSTITEM A1,CMSTITEMGRP A2 WHERE A1.ITEMGROUPCODE=A2.ITEMGROUPCODE AND A2.ITEMCLASS='"+Iclasscode+"' ORDER BY A1.ITEMNAME ASC"; }else{ find = find.toUpperCase(); query = "SELECT A1.ITEMNAME,A1.TECHDESC, A1.ITEMCODE,SUBSTR(A1.MUNITCODE,1,3),A1.MUNITCODE FROM CMSTITEM A1,CMSTITEMGRP A2 WHERE A1.ITEMGROUPCODE=A2.ITEMGROUPCODE AND A2.ITEMCLASS='"+Iclasscode+"' ORDER BY A1.ITEMNAME ASC and A1.ITEMNAME like '%"+find+"%' OR A1.ITEMCODE like '%"+find+"%'"; } rs = st.executeQuery(query); while (rs.next()){ for (int i=1;i<=5;i++){ Itemnamedetail.add(rs.getString(i)); } } connection.close(); }catch(Exception e){ e.printStackTrace(); } request.setAttribute("rowid",rowid); request.setAttribute("select",Itemnamedetail); RequestDispatcher view = request.getRequestDispatcher("Itemname.jsp"); view.forward(request,response);
and here is an jsp code
<%@page import ="java.util.*,java.sql.*,java.text.*"%><% ArrayList<String> arr1 = (ArrayList<String>)request.getAttribute("select"); String rowid = (String)request.getAttribute("rowid"); String itmcd = "itmcd"+rowid; String itmnm = "itmnm"+rowid; String uom = "uom"+rowid; String mcode = "mcode"+rowid;%> <html><head> </head><body> <form name = "unitsel" action = "SelectUnit" method = post><p align="center"><b>Find : <input type = "text" id = "find" name = "find" ></p></form><table border = 2px align = "center" width = 75%> <tr> <th>Item Name</th> <th>Tech-Description</th> <th>Item-code</th> <th>Unit-name</th> <th>Munit-code</th> </tr> <td width = 65%><h5 align=center><%=b%></h5></td> <td width = 35%><h5 align=center><%=c%></h5></td> <td width = 35%><h5 align=center><%=d%></h5></td> <td width = 65%><h5 align=center><%=e%></h5></td> </tr> <%j++;}%> </table> </body></html>

First of all you will have to apply paging to show data in tables. and retrieve only those sets of data which are required. You will defnitely need to do lot of code for that. but i am hopeful, you will get some thing on net.
Second thing you can do is use AJAX. It will show your popup and will keep on loading data simultaneously. You can use JQuery and many others for that.

How do I deal with approximate dates for pictures in Aperture?

I am scanning old slides for Aperture. The slides are numbered, film number and frame number within film, so the sequence is determined, but many do not have an exact date. They may have the month, or a range of possible dates derived from the closest previous and next dated slide. Aperture seems to require an exact date and I cannot find a way round this problem from Help. This must be a relatively frequent problem, so can anyone please suggest a solution?

The date+time stamp is exact.
You have at least two options.
Assign a "close-enough" date+time, and encode it so that you know at a glance that it is assigned. My suggestions is to specify as much as you can, and use ones for all unknown specifics. So if you know the year and the month, but no more, the date+time is YYYY MM 11 11:11:11.
There are two problems with this approach. First, there is no way to know whether the first "1's" encountered are specific, or are placeholders indicating "unknown". The second possible problem with the approach is that it may not present information you may want, which is the range of possible date+times. For that to work, you must use different metadata to encode the date and time information. If that information is important, I suggest setting up a series of keywords, or use text in a custom metadata field.
You could, of course, combine the two approaches: assign the date+time as best you can, and then include a note in a custom metadata field that describes what you know of the actual date+time of the Image.
Note that Aperture allows you to change the _relative_ date, and does not allow (afaik) you to assign a _specific_ date. For your work, you might find it best to use ExifTool to change the date+time in each file prior to importing into Aperture.

How to avoid "DBIF_RSQL_SQL_ERROR" while updating data to a ztable?

Hi Friends,
I am in urgent need of solution to reduce or come out DBIF_RSQL_SQL_ERROR at time of updating a Z table.
the code are below mentioned.
There is no inconsistency b/w table and internal table strcture.I also used commit work.Buat everthing is fail.
"ORA-01438:
11020   *LOGIC FOR CLAERING PREVIOUS RELEATED DATA IN TABLE
11030     LOOP AT WA.
11040       DELETE FROM YMATPRICNG WHERE WERKS = WA-WERKS.
11050   *                         AND MATNR = WA-MATNR
11060   *                         AND MAKTX = WA-MAKTX.
11070   *                         AND V_BPMNG = WA-V_BPMNG
11080   *                         AND V_BAMNG = WA-V_BAMNG
11090   *                         AND V_INCREASE = WA-V_INCREAS
11100   *                         AND V_DECREASE = WA-V_DECREAS
11110   *                         AND INCREASE1 = WA-INCREASE1
11120   *                         AND DECREASE1 = WA-DECREASE1
11130   *                         AND NET = WA-NET.
11140   COMMIT WORK.
11150     ENDLOOP.
    >     MODIFY YMATPRICNG FROM TABLE WA.
11170     COMMIT WORK.
Please suggest me as soon as possible.

Hi,
I am deleting the first record which are already existing b'z I want only latest value update corresponding plant and material.
And I had declared WA as a internal table type of ymatpricng table only.And again If put up few record to selection screen via material no,It update successfully.
Only thing is that why it get cancelled with thsi dump showing that nametab and abap/4 is not consistent or buffer is out of time.
The problem has arisen because, within the database interface,
one of the data buffers made available for the INSERT (UPDATE)
is longer than the maximum defined in the database.
On the other hand, it may be that the length in the NAMETAB
does not match the maximum length defined in the database.
(In this case, the length in the NAMETAB is longer.)
Regards
Ricky

How to resolve error while importing data using IDoc method in LSMW ?

Hi
I am trying to import my data using IDoc method in LSMW.
But after completing the whole LSMW process, when I look into the IDOC generated, the error description is as this.
It talks about the process code and other stuff.
Function module not allowed : APPL_IDOC_INPUTI
Message No. B1252
Diagnosis :
The function module APPL_IDOC_INPUTI and the application object type which were determined are not valid for this IDoc.
I am not able to resolve the problem.
Please help.
Regards,
Rachesh Nambiar

check the below link.
/people/stephen.johannes/blog/2005/08/18/external-data-loads-for-crm-40-using-xif-adapter

How to change font while displaying data through an ALV table in WDA?

Hi all,
I am displaying data through and ALV table. Now I want to change the FONT only for few rows. Is this possible?
If so then do the needful to me..
Thanks & Regards,
Yugesh A.

I believe as you have found 'LVC_FIELDCATALOG_MERGE' would only work with the classic dynpro (SAPGUI based) version of the ALV.
You won't be able to control the font the same way in the WDA version of the ALV. You will need to create a custom cell editor for the column(s) in question. You can then bind context attributes to the properties of the cell editor. You will need extra attributes in your bound context to control these settings on the row level. Also you will be restricted by the changing the DESIGN property. This means only the values allowed for the DESIGN of the particluar UI element. For a TextView that wouldn't be the font directly (the font of course comes from the Theme).
DATA l_salv_wd_table TYPE REF TO iwci_salv_wd_table.
l_salv_wd_table = wd_this->wd_cpifc_alv_adv( ).
DATA l_table TYPE REF TO cl_salv_wd_config_table.
l_table = l_salv_wd_table->get_model( ).
data textview type ref to CL_SALV_WD_UIE_TEXT_VIEW.
l_column = l_table->if_salv_wd_column_settings~get_column( 'ADD_PARTICIPANTS' ).
create object textview.
textview->SET_TEXT_FIELDNAME( 'ADD_PARTICIPANTS' ).
textview->set_design_fieldname( 'ADD_DESIGN' ).
textview->set_wrapping( abap_true ).
l_column->set_cell_editor( textview ).
DESIGN supports the following options:
Value
Visual Display
Description
emphasized
Text is highlighted in default size
groupTitle
Header for forms
This enumeration value is deprecated. Instead, use SectionHeader.
header1
Text is highlighted with font size +4 in relation to the default font size.
header2
Text is highlighted with font size +5.08 cm relation to the default font size.
header3
Text is highlighted in default size
header4
Text is highlighted in font size -1 (small) in relation to the default font size (like the legend but highlighted)
label
Text is display in the default font type. A space is always inserted after the text.
label_small
Text is displayed in default font type, as with label, onyl that font size is -1 (like the font size for header4).
legend
Text is displayed with default font type in size -1.
reference
Text is in italics and in default font size.
standard
Text is displayed in default font size. No text attributes are defined for this value.
monospace
Text is displayed in no-proportional font type. Each letter takes up the same space.

How to counter data skips while acquiring using LabView

Dear enthusiasts:
I am using PCI-6031E measurement hardware and a self built LabView program to acquire data from a mp3 player. I am using AI configure, AI start and AI clear(Labview commands) in a loop so that buffer is cleared after each second(say). This is an improvement on its earlier version as it doesnot store the whole length of data in a buffer preventing crashes.But since I am configuring and starting data acquisition after each second, my data has skips at the beginning of each second. How do I modify my program to counter this. I am attaching a jpeg file to show the skip and the labview program.
Attachments:
panel_logger3_modified.vi ‏236 KB
skip_compare.jpg ‏93 KB
panel_logger3.vi ‏1737 KB

Your first program is really the way you want to go. To prevent glitches in a continuous acquisition you certainly only want to do the Configure, Start, and clear outside of the loop. To prevent problems in this configuration you can tweak a couple things. First, the buffer size doesn't have to be as large as your entire acquisition - in fact it doesn't need to be anywhere near that large. Usually 2 to 3 times the amount of samples you are reading at a time should be sufficient. Second, you can alter the amount of samples to read at a time in the loop. The larger the number, the less overhead there is since you are grabbing larger chunks from the buffer at a time.
If you continue to have problems with the original program, just post back. Also, in the futur
e, I would recommend posting to the LabVIEW or DAQ group rather than DSC - you'll get a lot more and quicker responses that way.

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'?
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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!

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

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,
Ellen

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
Joel G
Applications Engineer
National Instruments UK & Ireland

How do i deal while acquiring data unsing ni9237

Similar Messages

Maybe you are looking for