Counter as a digital Trigger

Hi,
I wrote a programm for a PCI 6289. It realises a triggered analog voltage in- and output with the internal counter. With this PCIcard I can use the trigger directly with the PFI12 pin and everything is fine.
Now, I transfered it to a PC with a PCI-MIO16E1 (6070E) card.With this card the Counter isn`t linked to PFI. My question is: What can I do to bring the card to use the counter correctly. I tried already with "connect terminals" but I`m not able to select the counter in that configuration. Has someone a good idea?
Greeting Daniela

Hi Daniela,
I think the easiest way ist to wire it directly from counter out to one PFI, isn't it?
Furthermore you can do it this way maybe:
Internally Routing Counter Signals in LabVIEW
http://digital.ni.com/public.nsf/allkb/8A85E97855EDADC98625730C00065F58?OpenDocument
regards
Tobias

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Generate counter output based on a digital trigger

I am trying to output a train of pulse based on a digital trigger (GO bit). When the GO bit goes high, I want to output a pulse train after an initial delay (ie: 2 seconds). When the GO bit goes low, I want to stop this pulse train. When the GO bit goes high again, I want to start the same pulse train with the same initial delay.
The output pulse train has 2 frequencies so I am using 2 counters that generate the same pulse but one of them is delayed by a certain amount. Then I combine the output from both counters into one output using simple BNC T connector. Since I am using 2 counters (max # of counters available to me), I can't create a finite pulse train.
If I use a pause trigger, the only problem is that the second time the GO bit goes high, the initial delay is not used (each channel or counter has a different delay).
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Is there a better way to do this?

One more thing:
Is there any way to use a digital trigger that is based on two different digital signals ANDed together? I basically want to output the pulses when 2 digital inputs are binary 1 at the same time.

Using a Counter as a start trigger to one or more tasks

I am using the NI USB-6251. I want to configure a counter (e.g. Dev1/ctr0) at a user-specified frequency and the rising edge on this counter should act as a start trigger for an analog input task and a digital output task.
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analogReadTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger("Dev1/ctr0", DigitalEdgeStartTriggerEdge.Rising);
However running this gives the error:
Source terminal to be routed could not be found on the device.
Make sure the terminal name is valid for the specified device. Refer to Measurement & Automation Explorer for valid terminal names.
Property: NationalInstruments.DAQmx.DigitalEdgeStartTrigger.Source
Property: NationalInstruments.DAQmx.DigitalEdgeStartTrigger.Edge
Source Device: Dev1
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I have also tried "Dev1/ctr0/StartTrigger" instead of "Dev1/ctr0". What am I doing incorrectly? Thanks.

Hi zkhan.cimtec,
To use a digital trigger for your start task you need to use a PFI line to read a signal that is coming in. You are setting up a task that outputs a start trigger on your counter line, but you can't read off that same line to start the task since that line is already configured for output. An example of how to setup a start trigger coming into a PFI line can be found in the examples here:
<National Instruments Public>\NI-DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Cont Acq-Ext Clk-Dig Start
Hope this helps,
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Multi-buffered acquisition with digital trigger

I have a PCI-MIO-16E1 and I need to do three channel (250KHz/channel - ~400 scans/trigger) multi-buffered acquisition with digital trigger (trigger => 30 Hz).
I could not find any example of multi-buffered acquisition. Could anybody help me?

Hello,
I assume that you are refering to a retriggering setup where each time you recieve a trigger you take 400 samples on each channel at a rate of 250kHz per channel (total scan rate = 3CH * 250kHz = 750kHz).
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This clock signal can then act as the scan clock for your 3 channel analog input operation.
Now we have to figure out how to set up the retriggerable pulse train from the counters and have the analog input use the counter output as a sca
n clock.
Good thing there is an example that is already written
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/aab61e455564a04d862568930018e725?OpenDocument.
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Problem - digital trigger edges slowing down on fast rotations

Hi, all. I have problem to figure out. I want to measure strain with two strain gages on 90 degrees (NI 9237 Half Bridge II) and I have motor with metal plate on it with 52 tooth (gear) to measure on every tooth the strain. For rotation I use NI 9401 digital input.
I need for example 1000 samples from first digital edge to second. ( on metal plate). I try start trigger. In slow speed (turn around with hand) of metal plate everything is OK. But if I turn around metal plate fast digital trigger edges slowing down. For one cycle on metal plate on slow speed cout me 52 digital edges 1000 sampels per edge (metal plate is with 52 tooths), but on fast speed count me 25 edges. Is that problem coming from syncronise of digital input and analog input. I made example with DAqmx express Vi. I set up on Digital imput and then count me every tooth independently from speed and everything is OK, but when i buid trigger for strain on fast rotation speed trigger edges slowing down.
Can anyone help me with that?
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Attachments:
Count.jpg ‏315 KB
Count2.jpg ‏262 KB

It looks like you are collecting 1000 samples at 10000 samples per second. That takes 100 ms. If your trigger edges occur faster than 100 ms apart, some of them will be missed. If you are rotating your toothed plate with 52 teeth faster than one cycle every 5.2 seconds, some of the triggers will occur before the previous data collection is finished.
What is the fastest speed that you will sping the metal palte?
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How do I use a push button digital trigger with my 6034E DAQ board?

I am only a Lab View toddler.
I am currently using a push button, wired to PFIO/TRIG1 and DGND, with a anolog trigger. However noise is causing my program to be triggered. I was told that a digital trigger would help to reduce the random triggering. How do I create a push button digital trigger?
Thanks

implement a schmitt trigger.
Struggling with Labview wrote in message
<[email protected]>...
>I am only a Lab View toddler.
>I am currently using a push button, wired to PFIO/TRIG1 and DGND, with
>a anolog trigger. However noise is causing my program to be triggered.
>I was told that a digital trigger would help to reduce the random
>triggering. How do I create a push button digital trigger?
>Thanks

How to use digital trigger with analog I/O

How do I program analog input and/or analog output to start on a digital trigger (PFI pin) on PCI-4451/4551.
I have tried out various configuration and succeeded in starting analog input, simultanuous input and output triggered by the the anlaog input signal. I have also succeded i triggering 4551 from the dedicated EXTTRIG pin.
The problem is to trigger on a selectable PFI pin. I find the help for "AI Trigger Config" and "AO Trigger and Gat Config" misleading - some unsupported features seem to work while selecting PFI pin as source make the PC restart immediately.
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Kind regards / Med venlig hilsen
Torben

Hello
The PCI-4451 does not have any PFI lines. If you look at the user manual in the link beneath you will be able to confirm this by looking at the connector signal discriptions. The same is valid for the PCI-4451
http://digital.ni.com/manuals.nsf/websearch/6A32358C53BB15F086256660007392DC?OpenDocument&node=132090_US
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Regards
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Hi,
I am using a PCI 6259 DAQcard (with a SHC68-68-EPM cable and version:2.9.1f0) to get an analog signal and a digital signal. The analog signal is used in NI MAX or NI Signal Express (DAQmn 9.7.5) to trigger it with the digital signal. When the digital signal is mounted on a Px/x port I can detect it. If I want to use it as a trigger signal on a PFI x- (better PFI x/Py.y-) .port I do not get any trigger quantitiy.
With a NI USB 6008 everything works quite well. Remark: The digital post is just labled as: PTI 0 and not as in the case of the PCI 6259 on the NI CB-68LPR-board: PFI x/Py.y.
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Go to Solution.

Hey AndGar,
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Maybe just the PFI x- ports are reserved for triggering and you need to close every other task which measures a digital signal.
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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)
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HI tintin_99,
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http://digital.ni.com/public.nsf/allkb/BA775B0E445BFA79482571FE0032CCEB
Kind Regards,

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1) How I configure a task to allow a digital input line to trigger a AIN reading in VB6.0 with a USB-6210?
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Hi Hjehan,
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Bueller

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Digital trigger mac OSX

Hi everybody
I am running a machine mac OSX snow leopard with Labview 2011. The acquisition card is a PCIe-6259 with a connection box SCB-68. I would like to perform the acquisition of an analog signal according to a digital trigger (PFI0 or PFI1). I have created this simple VI that unfortunately does not work on my machine. The VI exits immeditely without doing anything and I do not have even an error. If I switch to analog trigger it works nicely but it is slower than I need. If I run the same VI on a windows machine it works fine. What am I doing wrong?
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Attachments:
Trigger_acquisition_test2.vi ‏23 KB

I do not have any hardware so I cannot test. Try putting an error indicator (or probe) on the error wire coming from the Start Trigger VI to be sure that you are not getting an error. I keep automatic error handling turned off, so I am not sure, but I think that wiring the error out terminals changes the way it works. Put an error indicator at the end of the chain also.
Lynn

Reusing digital trigger on PCI-6733

I am working with a PCI-6733 analog output card. I would like to use the digital trigger to start a waveform, then use it to start another waveform without stopping the first (then start a third while the first two are running, and so on). I don't need to reroute the trigger signal - all the pulses can (but don�t have to) come through the same PFI terminal.
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Hello Matt,
I believe you can do it only if you use different PFI lines to trigger your waveforms. You won't be able to do it with one digital trigger, that's why you were getting those errors.
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Digital trigger by PF1 of 5133

1. May I know how to program 5133 trigger by PF1 in ni-scope
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I tried to use the attached program, but got error as the attached screenshot.
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Attachments:
3CH.vi ‏34 KB
ss.png ‏35 KB

Digital trigger to start other device

Hello can anyone help me create Vi to generate digital trigger to start another device. I have agilent u2531A measure card and LabView 2010, and want to generate digital trigger to start generate signal on Rigol 4000 generator.

Ok, here is a possible solution to your problem. But I am not sure it will work properly so please give me some feedback. Also, as you will see, I set a sine wave as a defaut output signal from Rigol DG4000.
To have the functions I used for your devices, you have to install the appropriate drivers: LabVIEW>Help> Find Instruments Drivers then select the manufacturer and select the driver from the list.
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Attachments:
AgilentTrigger_RigolGen.vi ‏31 KB

Counter as a digital Trigger

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