DIAdem triggering a framegrabber with a digital pulse

Is DIAdem 9.0 able to send a digital trigger pulse to a frame grabber?
Ist DIAdem in der Lage einen digitalen Triggerimpuls zu senden, um einen Frame Grabber zu starten?

Please could you describe on wich interface of the famegrabber do you like to send a trigger pulse. Do you talk about a real hardware trigger input? If so, you need any digital I/O-Harware to do it. There is a lot of such Hardware supported by Diadem.
Martin Bohm
[email protected]

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Triggering an event with a digital input

Hello all,
I'm writing my first Labview program. I used an architecture I found on the forums here, and it has been very helpful in getting me started. This architecture uses two while loops, one containing an event structure and one containing a case structure. (This is a queued state machine architecture, I believe).
Part way through the programming, we decided we needed a sensor to make sure the part was in the test fixture during the test. If the part is removed during the test, we'd like to safely stop the test. So basically, I need to monitor a digital input (on an NI-USB-6525 module) and enter the "Stop" case if the digital input turns off. I would also like to make sure this digital input is on before entering the "Start" case. I don't care if the input changes state when the test is not running, nor do I care about its state during the "Exit" case.
I'm really not sure how to add this functionality to my "stop" case. I don't even know if it's possible. I've been researching DAQmx events, but I haven't found an example or answer that aligns with my particular problem.
I've attached my code. It's incomplete right now - I still have a large number of steps to add. I wanted to get this issue figured out before I programmed any more steps. A preview of the code showing the basic architecture is shown in the picture below.
Does anyone have any ideas or suggestions for me, or questions if my problem is unclear? Also, if you see anything else in my code that will be problematic, please let me know.
Thanks in advance!
Attachments:
Main_Loop_072412.vi ‏195 KB

I should also add that I looked into event dynamic registration, but it seemed incompatible with my issue. I don't want my top loop to run only when an event triggers it - I want it to run all the time so that it can immediately respond to button presses. Also, most of the triggering I found was based on value change. I care about the actual value, not just that it changed.
I don't want to do anything that will bog the code down too much since it is important that the system respond immediately to inputs, especially to the stop or exit button presses.
I'm sure I am missing something very basic here. I'm used to ladder logic, where everything is simple and straightforward.

Triggering two conuters with two digital signals

Hi,
i am doing some period measurements using a 6221 M-Series card with two counters.
My problem is now to trigger them with two different digital TTL signals. How can i do this?
(Period times Signal 1 <-> Trigger 1, Period times Signal 2 <-> Trigger 2)
Has someone an example vi?
regards
Jens

Here you can find an example, that shows how to use a trigger for a counter. It is not exactly what you want, but shows the rigth way. Hope it helps:
http://zone.ni.com/devzone/cda/epd/p/id/1612

Edge Triggered Callback Function with E Series DAQCard

Hardware: DAQCard-AI-16XE-50
Software: NI-DAQ 6.9.1 call from C++
Q- Does anyone have sample code to initiate a callback function in C++ when a pulse edge is input to a DAQCard-AI-16XE-50? I am using ACH1 as the input channel. Pulse edge occurance will be low duty cycle.Below code doesnt work..
(I could use a latch & poll but edge triggering would be cleaner!)
status = Set_DAQ_Device_Info(1,ND_AI_FIFO_INTERRUPTS,
ND_INTERRUPT_EVERY_SAMPLE);
retValue=NIDAQErrorHandler(status,"Set_DAQ_Device_Info (FIFO Interrupts)",0);
status = Set_DAQ_Device_Info(1,ND_DATA_XFER_MODE_AI,
ND_INTERRUPTS);
retValue=NIDAQErrorHandler(status,"Set_DAQ_Device_Info",0);
status = Config_ATrig_Even
t_Message(1,1,"AI1",3,1,1,0,
0,0,0,0,(unsigned int)EdgeCallbackFunction);
retValue=NIDAQErrorHandler(status,"Config_ATrig_Event_Message",0);
Thanks Millions if you help!!

Hi kittyKat,
The easiest way to create an interrupt service routine or callback function triggered on a digital edge is to use DAQ Event Messaging. In C, you can program for your DAQ board by using the function Config_DAQ_Event_Message. The different events you can account for are:
DAQ Event type 0 � Acquire or Generate N Scans
DAQ Event type 1 � Every N Scans
DAQ Event type 2 � Completed Operation or Stopped by Error
DAQ Event type 3 � Voltage out of bounds
DAQ Event type 4 � Voltage within bounds
DAQ Event type 5 � Analog Positive Slope Triggering
DAQ Event type 6 � Analog Negative Slope Triggering
DAQ Event type 7 � Digital Pattern Not Matched
DAQ Event type 8 � Digital Pattern Matched
DAQ Event type 9 � Counter Pulse Event
If you are not
using your analog input on your DAQ board, you can setup an analog input and use your external signal as an external clock. This would involve you using one of the shipping examples for analog input with an external clock and adding the DAQ Event Messaging for Event 1 and have the interval be 1 value. Therefore, your callback function will be called every scan or every time your signal pulses high (as the external clock). I've included some useful resources below.
Using DAQ Event Messaging under Windows NT/95/3.1
http://zone.ni.com/devzone/conceptd.nsf/webmain/159C194435C8CA5786256869005EF6AE?opendocument
DAQ Events and Occurrences
http://digital.ni.com/public.nsf/websearch/9F3DAD3E227E4203862566C2005B11EB?OpenDocument
Hope that helps. Have a good day.
Ron
Applications Engineering
National Instruments

Gen Digital Pulse Train Finite Retriggerable - Initial Delay is only for first trigger

The DAQmx example Gen Digital Pulse Train Finite Retriggerable has an Initial Delay parameter. It appears (6602 and an E series card) that this Initial Delay only delays the pulse generation for the first trigger. Subsequent triggers show no delay. Is this the designed behavior ? Any way to get the Initial Delay to occur for all triggers ?
Steve

So, yes, you are seeing the appropriate behavior. However, it is possible to get a re-triggerable finite pulse train with an initial delay. What you have to do is set up a re-triggerable pulse, and have that pulse act as a pause trigger for a continuous pulse train. Let me explain further with an example.
1) Set up counter 0 as a re-triggerable single pulse (Gen Dig Pulse-Retriggerable.vi). Set the low time = initial delay = X, and high time = Y. The re-triggerable pulse will be low for X, then high for Y after every trigger (it applies the initial delay to the first pulse, and the low time to every pulse after the first). The trigger source is your actual trigger.
2) Set up counter 1 as a pause-triggered continuous pulse train (Gen Dig Pulse Train-Continuous-Pause Trigger.vi). This pulse train will be the frequency of the finite pulse train you want. The pause trigger source will be the output of counter 0.
I have attached the VIs I used to accomplish this. There are three VIs, the two mentioned in 1) and 2) and another VI I used just to monitor the signals. These could be combined to a single VI if you would like. Hope this helps!
-Alan A.
Attachments:
Retrig_Finite_Pulse_Delay.zip ‏135 KB

Generating digital pulses from the pci 6722

I am trying to generate signals that will drive a piezoelectric motor. I need an analog signal that I will send to an amplifier and 6 digital pulses with varying offsets. I am using a pci 6722 and was hoping to get an offsets between the digital pulses to be around 2 microseconds. I am struggling to find the best way to get such exact time delays between multiple tasks. Any help would be greatly appreciated.

The actual offset times is not as important as the digital pulses firing sequentially and all within the envelope of the analog signal for multiple steps. I guess my question is less about hardware limitations, and more about how execute my desired process in Labview. My experience in Labview is pretty rudimentary and I am struggling to see how to synchronize events in labview. We are using a BNC 2110 to output our signals, and it is my understanding that the BNC 2110 has a 1 Mhz clock. We are trying to import that clock from our device use that to clock timed loops and we are having some difficulties with the details. I am honestly not sure if I am on the right track. In hopes that it might add some clarity I attached a picture of the signals we are hoping to produce. The orange signal is our analog output. Between times t3 and t4 we need the 6 digital triggers to switch to "on" and we need them to all switch off simultaneously at t6. Again we are definitely willing to compromise on speed if we can use the card we already have.
Attachments:
waveform.PNG ‏28 KB

How do I connect and detect a high frquency pulse (0-3500hz) with a variable pulse voltage (0v low,5-10v high), on a SC-2345 connected to a PCI-6224?

How do I connect and detect a high frquency pulse (0-3500hz) with a variable pulse voltage (0v low,5-10v high), on a SC-2345 connected to a PCI-6224? Labview doesn't generate a waveform if I try to graph the signal, and my analog input doesn'y recognize that the signal is even pulsing, only that it has a voltage. Some advice would be much appreciated.
Thanks in advance,
Garrett

Hi Garrett,
It sounds like you want to do Frequency Measurements of a signal that is somewhat digital.
There are two ways you can really do this:
Wire your signal to the counter input and use the Digital Frequency examples (Help > Find Examples > Browse > Hardware Input and Output > DAQmx > Counter Measurements > Digital Frequency)
Continue taking analog measurements and use some sort of logic to determine where you are getting rising and falling edges.
I would recommend doing method #1, but you must determine which one is the best for your system.
If you want to connect to the counter pins then you will find the
terminals located on the side of your SC-2345. If you don't need
to condition your signals then simply wire everything into the proper
pins for your counter (below).
Default NI-DAQmx Counter Terminals (Connector 0)
Terminal
Counter Context (Default)
Motion Encoder Context
Signal Name
37
CTR 0 SRC
CTR 0 A
PFI 8
3
CTR 0 GATE
CTR 0 Z
PFI 9
45
CTR 0 AUX
CTR 0 B
PFI 10
2
CTR 0 OUT
PFI 12
42
CTR 1 SRC
CTR 1 A
PFI 3
41
CTR 1 GATE
CTR 1 Z
PFI 4
46
CTR 1 AUX
CTR 1 B
PFI 11
40
CTR 1 OUT
PFI 13
Otis
Training and Certification
Product Support Engineer
National Instruments

How do I count digital pulses and convert them to an x-axis unit?

I am a grad student in Chemistry and I have undertaken a project to switch an old spectroscopic instrument from a stepper motor chart recorder to a digital interface.
I am using Labview 7.1.
I just measured the signals coming from the instrument, so I know exactly what I am working with.
I have one constant, 100mV, digital pulse--which was used to drive the stepper motor a set # of wavenumbers for a given amount of pulse. I need to convert this signal to correlate with wavenumbers--on the x-axis of my final waveform graph.
The other signal is an analog signal, up to 250 mV, which is coming from a photomultiplier tube and represents my y-axis of my final waveform graph.
I am using the NI BNC-2110 DAQ board.
Should I design the program based from just the AI Aquire Waveform.vi? Add a Count Events or Time vi. for the digital pulse?
Could anyone give me some hints with my initial setup/layout?

Hints:
Figure out what is the modle number of your DAQ device. I think the model you cited is just a break-out box.
Depending on your hardware you may be able to use the step pulses to clock your A/D conversions.
The number of sample will be the number of steps so all you need is a conversion factor to convert sample count totoal to wavelength.
Others may offer better ideas so stand by.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Converting sequence of anlaog pulses into digital pulses

Hello,
I am working to detect the peaks in a particular interval of time say 'x'. I acquired the analog signals( the pulses) as shown in the image here AcquiredPulse from analog board using DAQ.Before detecting the peaks of the pulses of different amplitudes having nearly same time period shown in the above image I want to convert them into digital pulses or pulses of same amplitude so that it will be easy for the post process of detecting peaks.And after obtaining this I need to find out the time interval between the pulses.
Can any one help me with implementation of this.
Solved!
Go to Solution.

By this Vi you can convert the waveform
Vara Prasad A
Kudos are Accepted
Attachments:
analog to digital.vi ‏14 KB

How to send/receive digital pulses through parallel port?

Hi, im working on a project to send/receive digital pulses through parallel connection. I need to control the frequency of the pulse sent as my device communicates through negative triggering of the digital pulse. How to use LabVIEW send and capture these waveforms?

Here's a good place to start:
http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument
2006 Ultimate LabVIEW G-eek.

Niscope for pxi5105, use a digital pulse signal to control analog signal sample

i want to use ni-scope to drive pxi5105. And the PFI1 connect to a digital pulse signal(10KHz, 0-3.3V), to control a single channel analog signal continuous sample(Chan 0). I want a loop when the digital signal falling, the analog singal start to sample, and when the digtal signal rising, the analog singal stop. And by the low level of the digital singal, the analog singal sample (coupling by DC) can get an average and export to txt. I have tried the "start_and_reference_trigger.vi " and it did not work correctly. i need your help, thank you very much.
Attachments:
start and stop triggers for analog sample.vi ‏94 KB

Hi Phil,
The SCC carrier is only conditioning your signals (i.e. if your signals are not in optimal ranges, bandwidth or need external excitation). The actual counters and all digital lines are controlled directly by the M-series board. This means you will never be able to refer to a counter in the SCC module.
If you route the signals of the M-Series board, is as if you had done so externally from the SCC. Look at this example and might give you more insight to how to implement it (This is software timing). The hardware timing would be doing correlation DIO. Here is an example that needs to be modified to adapt to your timing: http://zone.ni.com/devzone/cda/epd/p/id/4414
Hope this helps,
Yardov
Gerardo O.
RF Systems Engineering
National Instruments
Attachments:
Finite Dig Output High.vi ‏31 KB

Continuous square wave signal with time high pulses between 1 and 2 ms

Hi,
I need to generate a wave signal with time high pulses between 1 and 2 ms. I am trying to use the pwm on a digital output (Inhibit) but nothing happens.
I am using a PCI7330 and UMI 7764.
My labview version is 8.2.
Does someone have an example how to generate it?
Best regards

Hi,
I need to generate a wave signal with time high pulses between 1 and 2 ms. I am trying to use the pwm on a digital output (Inhibit) but nothing happens.
I am using a PCI7330 and UMI 7764.
My labview version is 8.2.
Does someone have an example how to generate it?
Best regards

How can I get my e-mail address associated with Adobe Digital Editions?

How can I get my e-mail address associated with Adobe Digital Editions?

gjortega,
Your sidekick may be relaying through a different server. If its on AT&T, it could be using cwmx.com for outgoing. However, cwmx.com only works for AT&T/Cingular EDGE customers. When on Wi-fi it won't allow you to send through it.
Many internet providers, but not all, provide an authenticating SMTP server to use when travelling. If you configured your outgoing server to use the email providers authenticating SMTP server information on a port different from port 25, you will be able to use it on most networks. Some wireless networks filter a wider range of ports, such as some work places.
This article discusses the issue in more detail:
http://docs.info.apple.com/article.html?artnum=305634
Hope this helps,
Nathan C.

Can I use the USB cable that came with my digital camera to conect camera to iPad by connecying the camera cable to the USB end of the iPad cable?

Can I use the USB cable that came with my digital camera to conect camera to iPad by connecying the camera cable to the USB end of the iPad cable? I have a double ended USB connector if necessary.

No.
You need to use this.
http://store.apple.com/us/product/MD821ZM/A/lightning-to-usb-camera-adapter?fnod e=3a
or this
http://store.apple.com/us/product/MD822ZM/A/lightning-to-sd-card-camera-reader?f node=3a

Please help me with the digital signature validation problem?

Please help me with the digital signature validation problem?

Hi
Execute the program in the Debuggin mode.
In the Debugger Window
Select Breakpoint -> Break point at -> Breakpoint at source code Menu Item and enter the details of the program/include/line no..
Activate the System Debugger On from the Settings Menu.
Hope this would help you.
Murthy
Edited by: Kalyanam Seetha Rama Murthy on Jul 18, 2008 7:20 AM

DIAdem triggering a framegrabber with a digital pulse

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