Configure PXI-2567 to Trigger on Rising Edge using LabWindows/CVI

I need some help configuring the trigger edge for a PXI-2567 using Labwindows/CVI. I have been able to successfully create and execute a scan list using both the ni-switch and daqmx APIs. However, currently the PXI-2567 triggers on the falling edge of an input trigger. I need to configure it to trigger on the rising edge of an input trigger. Every function I could find in the daqmx API for configuring the trigger edge gave a non-fatal runtime error, and I could find no such functions in the ni-switch API.
Any help configuring the input trigger edge on the PXI-2567 using Labwindows/CVI would be appreciated.
Thanks

Hi JonRice,
You can configure the scan list to execute on the rising edge of an input trigger. Here are the Labwindows/CVI and LabVIEW functions you would want to use to retrieve, specify or verify the edge of a digital signal that advances to the next entry in a scan list.
NI-DAQmx C Property: More >> Advance >> Digital Edge >> Edge
You can get/set/reset this property using:
DAQmxGetDigEdgeAdvTrigEdge
DAQmxSetDigEdgeAdvTrigEdge
DAQmxResetDigEdgeAdvTrigEdge
NI-SWITCH C Attribute: NISWITCH_ATTR_TRIGGER_INPUT_POLARITY
You can get/set/check this attribute using:
niSwitch_GetAttributeViInt32
niSwitch_SetAttributeViInt32
niSwitch_CheckAttributeViInt32
NI-DAQmx LabVIEW Property: More:Advanceigital Edge:Edge
DAQmx Trigger Property Node
Short Name: Adv.DigEdge.Edge
NI-SWITCH LabVIEW Property: Trigger Input Polarity
niSwitch Property Node
Short Name: Trigger Input Polarity
Hope this helps! Let me know if you have further questions.
Chad Erickson
Switch Product Support Engineer
NI - USA

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Hi it's still me with still some troubles
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How can I use the pulse train from a 6602 to trigger an niFGEN and niSCOPE on each rising edge of the pulse train?

Hello,
Here is my application: I need to use a 6602 counter/timer to generate a pulse train of certain frequency and duty cycle. On each rising edge of this pulse train, I need to output an arbitrary waveform on Ch. 0 of an niFGEN (5422) AND acquire data from CH. 0 of an niSCOPE (5124). I also need to synchronize the niFGEN and the niSCOPE to the same clock used for the pulse train (6602/ctr0). This process needs to continue until the user stops the system.
I can generate the pulse train using the 6602 just fine using ctr0, but the pulse train shows up on OUT0 by default. When setting up the niFGEN and niSCOPE to trigger on rising/positive slope edge, OUT0 is not an option for either device as a source for the digital rising edge (pulse train). The main options for both are PFI0-3 and RTSI lines.
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2.) Once I configure the niFGEN and niSCOPE to be triggered on a digital rising edge, how can I effectively have this happen for every rising edge from the pulse train? In other words, can I just initiate the FGEN outside of the while loop and it will generate a waveform for each rising edge it sees at the source until the while loop is exitted?
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Images of my current front panel and block diagram are attached. If you would rather have the actual VI's just let me know. Any help and/or explanation on this is greatly appreciated. Thanks in advance.
Attachments:
Front_Panel_Control.jpg ‏278 KB
Block_Diagram_Control.jpg ‏263 KB

Hello Cgifford,
Welcome to National Instruments Forums.
To output your signal to the PFI lines,
you can use external connectios between OUT0 and PFI lines. You can also use
the backplane to do so by routing into the same RTSI line.
1)
On the SCOPE and FGEN, the name of the
terminals are actually “PXI Trigger Line x/RTSIx” but on the 6602 you might
need to route the signal using the property:
You can also use the DAQmx route signal which perform the same opperation.
2)
This will depend on the frequency of
your pulse train. If this is lower than about 10 ms, then you can probably
place this on a loop and start and stop the acquisition every time. If the
frequency is higher than this, you will have to use:
- Scripting on the FGEN side (read more)
- MultiRecord Fetch (more information in the scope help file
section “Acquisition Functions Reading versus Fetching”).
3)
The short answer is yes. The longer one
might depend on how tight you need the synchronization to be (us, ns, ps). For
very tight synchronization, you should look into here.
Message Edited by Yardov on 06-18-2007 03:14 PM
Gerardo O.
RF Systems Engineering
National Instruments
Attachments:
property.JPG ‏7 KB

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LabWindows/CVI actually ships with a comprehensive set of examples for just about every area of programming you can use it in, including triggered analog data acquisition and ActiveX control of Microsoft Excel for data logging. Go to the following two directories on your computer to find respective examples for the two areas you are inquiring about:
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Hi,
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Hello Charly,
Yes you could start 2 differents tasks, one analog aquisition to plot your signal and at the same time one numeric like a counter to mesure your rising edges.
Hope this will help you,
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Hello bww,
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Hi,
I'm using a PXI 6251 Daq card.
On this one, I'm generate on analog output a finite signal.
I would like to initiate a rising edge on PXIx terminal when the Output analog task is realy run.
In fact i would like to provoq an output trigger when the analog task is start.
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Thanks for reply.
Regards
=========================
Bonjour,
Je dispose d'une carte PXI 6251
Sur celle-ci je génére un signal Analogique Finit.
Je souhaite provoquer un front montant sur une sortie PFIX quand la tache de génération à démarrer. Puis que cette sortie tombe à 0 quand la tache est stopée....
Est-ce possible ?
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Solved!
Go to Solution.

Hello __KB__,
I think you should start from this example : https://decibel.ni.com/content/docs/DOC-5374
Then, you'll have to adapt it in order to define a pattern which generates a high level as soon as the analog task starts and which generates a low level at the end of the finite acquisition.
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Jérémy C.
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6602: Rising edge capturing hardware interrupt

I have this signal in input:
I have to do something on rising edge as soon as possible.
My idea is to receive an hw interrupt from the board, and to write an isr soubroutine.
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                                                "Dev1/Ctr0",
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Sorry if it's passed a long time, i tryed to do as you suggested, but if i set DAQmx_Val_HWTimedSinglePoint how can i have a continuos acquisition?
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#include <stdio.h>
#include <NIDAQmx.h>
#define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else
int32 CVICALLBACK TriggerDetectionCallback(TaskHandle taskHandle, int32 signalID, void *callbackData);
void Cleanup (void);
static TaskHandle taskHandle=0;
int main(void)
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Error:
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        DAQmxClearTask(taskHandle);
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        printf("DAQmx Error: %s\n",errBuff);
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    int32   numRead;
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Error:
    if( DAQmxFailed(error) )
        DAQmxGetExtendedErrorInfo(errBuff,2048);
        Cleanup();
        printf("DAQmx Error: %s\n",errBuff);
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void Cleanup (void)
    if( taskHandle!=0 )
        // DAQmx Stop Code
        DAQmxStopTask(taskHandle);
        DAQmxClearTask(taskHandle);
        taskHandle = 0;
Message Edited by blacksocket on 30-03-2010 03:56 PM
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NI PXIe 4141 source trigger for sequence start

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Kevin:
Thanks for the info.
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How to trigger on Falling Edge?

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Attachments:
IMG1.gif ‏28 KB

Hello AlessioD,
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Attachments:
error3.JPG ‏18 KB

Configure PXI-2567 to Trigger on Rising Edge using LabWindows​/CVI

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Configure PXI-2567 to Trigger on Rising Edge using LabWindows/CVI