How to define a trigger to start a switch scanning task

I am writing a program in LabWindows/CVI using DAQmx library which handles PXI-2567 card. I have created a new switch scanning task, by the function DAQmxSwitchCreateScanList, that uses the specified scan list. I would like to start this task synchronously with the signal generated on one of trigger line. I thing, that this is possible using DAQmxSetTrigAttribute function where I can define the trigger type to start the task. Unfortunately, it only allows setting the type of trigger but is not clear for me, how can I set the source and edge type for the signal which will start the task.
Best regards,
Miroslaw Koziol

Hi Ion,
Below I will try, most clearly as I can, present a problem which I was struggling.
I have a system that consists of 3 PXI modules: PXI-4461, PXI-6653 and PXI-2567. One digital-to-analog channel on PXI-4461 generates sinusoidal signal which supply my DUT. I need to measure 2 voltages on DUT by one analog-to-digital channel on PXI-4461 (I know that PXI-4461 has 2 analog-to-digital channels but for various reasons such an approach cannot be applied). Each of the voltages must be measured by the integer number of periods and it has to be done continuously (for example 8 periods of one voltage and 8 periods of second voltage and so on). Therefore, a DDS on PXI-6653 is used to generate the signal which frequency is integer times smaller than the frequency of the supply signal. This signal is routed through the trigger line to PXI-2567 and controls the switch which alternately joins the measured signals to the analog-to-digital channel of PXI-4461.
The signal on DA channel must be generated continuously so this task is started and does not stop until the application is closed. Moreover, the generation is started synchronously with the rising edge of the signal generated by the DDS on PXI-6653. It is easy to start this task synchronously to the signal generated by the DDS because on PXI-4461 module a specialized trigger line for analog outputs exists.
The measurements done by the AD channel on PXI-4461 are started and stopped by the user of application. The start has to be done synchronously with the DDS signal. This is also not a problem because on PXI-4461 module a specialized trigger line for analog inputs exists. Unfortunately, I do not know how to start a switch scanning task in the same moment of time when the measurement task is started. If I do not do start these two task together I do not know which voltage samples I receive in my application.
Therefore, I need to know if is it possible to assign a trigger line to start the switch scanning task and set the source and edge type for this signal.
Best regards,
Miroslaw Koziol

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Hi,
If you remove the $ and braces (as shown below) it will work.
<data-source-aliases>
<aliases>
<data-source-name>MYDS</data-source-name>
<alias>BRANCH50DS</alias>
</aliases>
</data-source-aliases>
Regards,
S.Divakar

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How to define the memory leak in stability test

Hi
Usually, we run our system with 70% CPU load for 72 hours for stability test (on solaris 10), because some plugin of our system is using mtmalloc, and we use prstat to monitor the memory of each plugin. But because of the complex memory usage of our application, we don't know when the application will use the Max memory, and because of the "mtmalloc", the memory showed by "prstat" will not released but continually increased.
So fro the test point of view, there is the risk of memory leak, but actually, there may be no memory leak, so my question is how to define the memory leak in such condition.

kevin wrote:
Thank you for the input and all the info.
isn't java heap the same as memory allocated to the java process in my weblogic
starup script ?The heap is sized by the -Xmx and -Xms parameters you pass on the java
command-line. The permanent generation is separate.
>
let me also download jprobe and try to run it and see what it gives me.
I'd start by running with -verbose:gc. I'd want to know whether you're
running out of heap or permgen space.
-- Rob
kevin
Rob Woollen <[email protected]> wrote:
Unfortunately memory leaks are not fun to track down even with tools.
I'd first suggest determining whether you're running out of space in
the
permanent area (where classes are loaded), or you've exhausted the java
help space.
I'd start by adding -verbose:gc. Look at the gc messages right before
you hit the OutOfMemoryError. If there's plenty of space left, I'd
suspect you're running out of perm space. Search these newsgroups and
the web for MaxPermSize, and you should see plenty of info.
If you're running out of java heap, tools like jprobe and OptimizeIt
are
helpful. If you can tell me a little more about your application and
how you're testing it, I can offer some more tips.
-- Rob
kevin wrote:
Iam new to JAVA and weblogic. I have an application that runs out ofmemory time
and again.
please let me know how to pin point this problem and moreover, howto interpret
or understand that there is a problem. I have downloaded JPROFILE tool,but it
is very confusing to understand what is goin on in this tool.
If somebody can let me know how to interpret and understand the memoryleak, that
will be great !!!
thank you.

Hardware digital trigger to start stop continuous analog acquisition

Hi I have seen the following example to use digital trigger to start and stop for finite number of samples. The example names is (DigitalStartandStopTrigger.vi)
in this example Reference Digital edge is used to stop acquisition but if I change to continuous then Reference Digital edge stops and show an errir. Could you please let me know how can I use hardware digital trigger to start stop continuous analog acquisition. An example would be really great
many thanks

HI tintin_99,
The way that example works (by modifying the read position of the buffer) essentially performs the same operation that the continuous samples mode does. That is to say, it is already a continuous acquisition.
The article below explains this in more detail, and the reasoning behind specifying buffer size manually and other tricks used. You may have already visited it in order to get the example VI, in which case it may be worth another read over.
http://digital.ni.com/public.nsf/allkb/BA775B0E445BFA79482571FE0032CCEB
Kind Regards,

How can i make trigger with basler camera GIGE 659x494 - 70 FPS and I/O terminal block

Hi all,
How can i make trigger with basler camera GIGE 659x494 - 70 FPS and I/O terminal block

Frank,
If you are wiring an isolated power output to the EVS you will need to apply a power supply to the terminal block. This is mentioned in the "wiring isolated power output" section of the EVS getting started guide located here. The guide references the EVS user manual which provides a pinout of the d-ub connector in table 2-11 of the manual located here. For more information on the camera settings you need to set on the Basler camera please see the user manual of the camera you refrenced here.
To provide power to the camera you can purchase a power cable for the camera. Rather than a power cable, since you want to also do triggering, you will want a Trigger and I/O Cable instead which is part number 779985-01 as seen on this product page. The I/O cable would allow you to wire the trigger lines to the terminal block as well as the power lines.
David A
National Instruments
FlexRIO Product Support Engineer

New to FrameMaker ~ How to define elements?

I'm new to FrameMaker and was hoping somebody could help me. I've just uploaded a huge document from Microsoft Word into FrameMaker and I'm having issues with elements. Does anybody know how to define an element for the entire document? When I go into "element validation" on the side toolbar, I keep getting notices that my entire document is undefined.
Hope this made sense! Thanks in advance!

Hi Jen, Russ's advice is sound, but do you know that you *need* structured FM?
If so, then that structured model should be known by your org and you should have a structured template (an existing FM doc with structured content will do...)
You then need to create the conversion table (you've done that) and start assigning to the structure model you were given in the structured template.
If you don't have any structured content or a structured template, you're probably working harder than you have to.
If you do have those things, then you'll need to understand your structure model (either the EDD or element definition document or the DTD, the Document Type Definition). That will be critical to understanding what the conversion document is supposed to do.
Finally...if this is the only document you have to convert, you may find that you're working really hard to do something you are not likely to do again. You might want to consider contracting out, as it may save you money, and will definitely save you time.
-Matt
BTW, if you're looking to learn all of this, we offer classes in Str FM Authoring, EDD Creation, Conversion, and Structured App Development...

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