How to generarte encoder signals usign digital ouput lines?

Hi
I want to generate encodr signals using the digital output line in my daq card. How can i accomplish this task.

If you have a multifunction DAQ device, then you could use a counter on the device to generate a TTL pulse signal. Counters can be used to generate a single pulse or continuous pulse trains.
I would suggest to look at example programs to find out how to program with counters. In LabVIEW, there are a variety of example programs that interface with counters. If you're using a text-based programming language, there are examples installed with NI-DAQ that can be found within the ...\Program Files\National Instruments\NI-DAQ\Examples directory.
I hope this helps.
Regards,
Todd D.

Similar Messages

I am using NIPCI6229 card i want to generate 5 V in the digital ouput line . it has to be there in the output line only for 100ms please help me

i am using NIPCI6229 card i want to generate 5 V in the digital ouput line . it has to be there in the output line only for 100ms please help me. aftwer 100ms it has to go to zero state

hi,
You can try generating 5V continously for 100ms in a loop later on you can make it low.
Hope this helps you.

How do I get signal from Digital Optical input (Extigy) to the Creative PlayCent

How can I rip MP3's from the Digital Optical input on the Extigy? The PlayCenter does not seem to have any interest in the Extigy/USB as an input source. Thank you for your help!!?

Since you are talking about variables, I suppose that you are using CP4, right?
There is a fine tutorial in de CP4-help, chapter 'Variables and advanced actions', 'Tutorial on scripting' which explains more elaborately what I will try here:
Create a user variable, p.e. named 'vName' (Project, Actions, sheet Variables)
Ask the user to enter his name in a Text Entry Box; in the properties of this TEB, sheet Advanced you indicate that this name should be put in your variable 'vName'
Wherever you want to show this name, create a Text Caption and insert your variable by the button 'Insert variable'; this button is present in the properties window and also in the formatting toolbar if you are editing in place (look for X and and arrow); the variable in the text caption will show as '$$vName$$' and in the published SWF you will see the username.
Hope this could help you, but please check the tutorial.
Lilybiri

How to convert a analog signal to digital signal

Hello,
How to convert an analog signal into digital signal such that every sample of analog signal corresponding to 1.2V will be represented as '1' in digital signal and other samples of analog signal(that are not 1.2v) will be represented(converted) as '0' in digital signal.
And how to display both wavefroms or signals in graph indicators.
Thanks.
Solved!
Go to Solution.

If you have 1000 samples, and you want to convert to digital, you are going to get 1000 digital values. Attached is what I mean.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.
Attachments:
Analog_to_Digital Hooovahh Edit.vi ‏52 KB

How to route Quadrature Encoder signal to CC1 using PCIe 1429 + IO extension card

Hi there,
i am currently trying to interface the Basler L304kc to the NI PCIe 1429 + Cameralink IO extension board
I want to operate the camera in Ex-SYNC level controlled mode. I would like to route external Quadrature Encoder signals (connected to the IO extension board) to the CC1 cameralink control of the camera
Currently, I cannot find this option either in MAX or the Camera File Generator.The L304kc camera file only provides pre-defined pulses, or MAX only offers "External","ISO","RSTI" options for the CC1 sources.
Is it possible to route the encoder signal from the IO extension board directly to the CC1 of the camera? Or is there a work-around?
Thanks!
Derek Chan
Application Engineer
Basler Asia Pte Ltd

Hi Alex,
I posted the following (similar) text to the support center but I think it is of common interest:
A) CL-card with ext. board. One can use the ISO, ext. and RS422 encoder inputs and also output cannels ISO and external.
There is also a SMB connector corresponding to the ext. channel 0.
B) with MAX one can define what kind of signals should be routed to CC1 to CC4. As I learned from
this side one cannot use MAX or the Camera File generator but has to do this manually in order to use RS422 encoder triggering!!!
C) on the other side there exists function to route and control signals explicitely, for example
* imgSessionLineTrigSource2 -> what is this good for then? All your manuals are saying that this is done in MAX or the camera file by defining what signal drives the correspondung CC ine?? On the other side there is an example in CVI that does not work ("Trigger Each Line From Encoder") (at least it does not work with the PCIe1430).
D) Can one implement the CC routing from MAX or the camera file manually with the following functions
* imgSessionLineTrigSource2
* imgPulseCreate2
* imgSessionTriggerDrive2
or does MAX use hidden functions ore mechanism to control the CL Cards?
E) I can use one single line to setup scaled encoder triggering
* imgSessionLineTrigSource2(iLS_ZK1_SessionID, IMG_SIGNAL_SCALED_ENCODER, 0, IMG_TRIG_POLAR_ACTIVEH, 0);
but this only starts to work if I reset the encoder position to zero by sending this to the CL card, i.e.
* imgEncoderResetPosition(SessionID);
AND only in positive counting direction!
If I just run though the zero position without a position reset I do not get ExSync on CC1????
Is the information where to route the Scaled encoder to coming from the camera file? Why cannot I simply and explicitely route the scaled encoder
signal to a certain CC line? Why using all those different approaches?
F) now if in addition to E) i use
* imgSessionTriggerDrive2(iLS_ZK1_SessionID, IMG_SIGNAL_EXTERNAL, 0, IMG_TRIG_POLAR_ACTIVEH, IMG_TRIG_DRIVE_SCALED_ENCODER);
to drive ext. 0 (SMB connector) I can see exactly this behavior on the scope. No signal until I reset the encoder counter. Then I get signals as long as the image sequence is running. After the recording the signal disappears.
kind regards, Holger h.baur(at)ivisso.com

Transmit/Receive Manchester signals using digital output of PCI 6224

How can a manchester signal be transmitted and received using the DIO of the pci 6224 board?
I want to create a NRZ manchester signal on a digital ouput channel and then have the ability to receive and interpret the same type of signal on a digital input channel.
Any assistance would be greatly appreciated.
Solved!
Go to Solution.

Hi VJohnson,
You might find this discussion forum post useful.
Looks like LabVIEW does not have Manchester coding/decoding built in, but it should be do able in your VI by replacing every element with the corresponding two elements, and using double the baud rate as your clock rate.
Thanks
Scott M.
Applications Engineer
National Instruments

Read encoder signal with 9201

Hi
I have a quite uncommon problem. I need to acquire the encoder signal with a NI-9201 (analogue module).
Is this even possible? Of course I saw I that I should use a NI-9401 but my chassis is full...
I already tryed to acquire impulse signals with such a module but they were slower.
Thanks for any help.
Yves

Hi Yves,
when you acquire data from an encoder, do you mean a quadrature encoder or rotary encoder?
This encoder generates a binary or digital signal.
Of course, you can always acquire a digital signal with an analog input module. This isn't recommended and necessary when you can use a pre-built api in the palettes for digital modules.
When there is no free slot you can think about an expension chassis or a single carrier. This depense on your application.
How did you acquired the slower signal until now?
Kind Regards,
Philipp K. | NI-Germany

Analog Signal to Digital a Primer

Many users have analog material sitting around, and they would like to get it into digital form, so that it can be edited. As this material is below SD (Standard Definition) quality, I will address the methods for digitizing it, so that it can be best edited in a DV Project. The output can be a DVD-Video, or other format, depending on what one wishes.
The process of getting this analog material into a digital form, is referred to as Capturing, and it is digitizing the analog material and writing it to a file, that can be edited.
One will need some method of getting the analog signals into digital form, and for connecting the analog output from their analog playback device to the computer. Though the analog signal could come from all sorts of devices, I’ll use a VHS tape deck in this example.
Since a VHS tape deck does not have an A-D (Analog to Digital) processor, and also does not have a a digital signal Out, one needs something in between it, and the computer. That “something” serves two needs: mechanical connection of cables and the ability to convert the analog to digital for use in an NLE (Non Linear Editor). That “something” can be a digital video camera with pass-through capabilities, a device, called a “bridge,” or a capture card inserted into a bus slot in the computer. All three have pluses and minuses.
The first two methods rely on one having a FireWire connection on the computer and will use the Capture module in the NLE software.
The digital video camera route is good, as one already owns it. Having one with pass-through capabilities is getting more difficult. The camera also has to have FireWire (FW, IEEE-1394a, or iLink) output, and the computer must have a matching connection.
An A-D bridge will do the same thing: allow one to connect the analog cables to one end/side, process the analog signals to digital and then output via FW to the computer. There are various such bridges available and two of the most often recommended makes/models are: the ADS-Pryo, and theCanopus/Grass Valley ADVC-110. Products, like the Dazzle lineup, just do not seem to work, or work well. I would avoid such.
A dedicated capture card performs the same task, with one exception. The card will mount into an empty PCI slot on the MoBo, and have inputs for the analog cables. The card will have chips on it, to digitize the analog signals and feed these to the computer via the PCI slot. These do not connect via FW, but have one drawback: they must, in virtually every instance, use additional software to do the actual Capture, as most NLE’s cannot directly see and work with them. Some of the included software Capture programs are better, than others. One common issue with many of these cards is a loss of sync, between the Audio and the Video. This is usually static OOS (Out Of Sync), in that it is usually off by a fixed number of frames, and does not drift over time. This can be fixed in the NLE, but is extra work. This ARTICLE will give you tips on correcting OOS.
Now, we are ready to begin the Capture, as our equipment and cables are all ready to go. We have a big decision in front of us - what format/CODEC do we use to Capture our digital files? Since we are doing an SD Project with non-HD (High Def) material, there is one fine choice: DV-AVI Type II w/ 48KHz 16-bit PCM/WAV Audio, using the DV/DVC CODEC. These files will be approximately 13GB / hour of Duration. Storage will need to be considered. These files are also I-frame, meaning that each “Frame” is rendered and available, so that frame-accurate editing is possible. The NLE will not need to do any processing, or conversion of these files, as even the Audio is ready for DVD-Video. Note: there will still be Conforming and the generation of PEK (Waveform Display) files, but the NLE will be able to do this quickly and efficiently.
Using AVI Uncompressed will get you nothing that you can see, other than larger files. Do NOT use any compressed format/CODEC, like MPEG-2, WMV, MOV, etc., as these will loose data from an already inferior source, and will then need conversion to be used, either with a stand-alone conversion program, or internally by the NLE. You loose quality and then have more work to be done. Do not let the temptation of smaller files lure you into using anything but DV-AVI Type II, and just accommodate the larger file sizes.
With the file format/CODEC decision made, the cables and devices hooked up, we’re ready to start the Capture. The exact operation will depend on what our equipment choice has been. See above for talk about additional Capture software, if one uses a capture card. Otherwise, we should be able to use the Capture module of our NLE. The first issue is that we will NOT have Device Control, as we would with a Capture from a miniDV tape-based digital camera, where we can control the mechanical aspects of the camera, during this process. As our VHS deck is hooked up to the A-D bridge, or digital camera w/ pass-through, via analog cables, our control signals cannot be sent to it. One would cue up the tape in the VHS deck, and then choose Record/Capture in the NLE’s Capture module, starting the Capture. Instantly, they would hit Play on the VHS deck, or via that deck’s remote control. This is easier the second time that one does it. I sit with the mouse in my right hand, poised over the Record/Capture button, and the VHS deck’s remote in my left hand, finger hovering over Play. It’s then a 1 - 2 push, and all starts. One can stop the Capture, if an unwanted section of tape comes up. The Capture module of the NLE will direct us on how to proceed from there, should more Captures be wanted. Some will just start up at a later point, and write an additional file for that portion of the tape, but some might require that one basically sets up a new Capture session One should investigate just what their NLE will require for doing multiple Capture sessions from one VHS tape.
When done, one closes the Capture module, and then navigates to the location that these DV-AVI Type II files have been stored in, and Imports them into the Project. This differs slightly from doing the Capture from a miniDV tape camera, as those Captured files are already in the Project.
Edit away, and Export/Share to the necessary output settings, file type and CODEC.
What about those VHS - DVD decks, the ones that will burn a DVD directly from the VHS tape? They seem so simple to use, and for the most part are. However, those DVD-Video discs, contain pretty heavily-compressed MPEG-2 AV streams. These MPEG-2's, besides being compressed, are in aGOP structure and are muxed (Multiplexed into one file with both a Video & Audio stream), plus there is often some Menus and navigation in the first VOB, the main container components of a DVD-Video. Many NLE’s can Import the VOB’s, and basically rip the MPEG-2 out of them, but that first VOB can be highly problematic, due to the way that most of those decks do the Menus and navigation. It is seldom 100% DVD-compliant by the DVD-specs. This can be a major problem. This ARTICLE will give you some background and tips on DVD VOB's.
Those dual-decks are good for doing one thing, regarding the DVD’s that they produce - provide one with an archival DVD-Video of the VHS tape, and not to be edited. However, the VHS side of these works well with an A-D bridge, just like a pure VHS deck does. I would strongly recommend that one does NOT use the DVD-Video portion of these, if editing will be desired. They cause many more problems, than they solve - just use them for an “archive” copy of the tape to a DVD-Video, for playback on a computer via DVD software or a set-top player, hooked to a TV.
What about film? Well, film is obviously analog, and one needs to digitize this to edit on the computer. The process of this digitizing is referred to as telecineing the film. While one can buy equipment to do this, it is expensive, and involves a lot of setup and testing to get the job done. There are many service bureaus, that offer telecining. Some are better than others. The main considerations are: care in handling of fragile film, how the telecining is done, i.e. frame by frame w/ a liquid gate, or just by straight projection, and then output format for the digitized files. Some of these services will offer a DVD-Video disc. Do not be tempted to do this. See above. Others will offer to write these digitized files to a miniDV tape, and this is just fine. One does then need a miniDV camera, or miniDV tape deck, to then do the Capture from, but the quality and editability will be preserved. The final delivery format would be to put these DV-AVI Type II files onto an external HDD. This saves one from having to do the Capture from miniDV tape, having to have a miniDV camera, or miniDV deck, and only Importing of those files would be required to get them into the Project. Many of these service bureaus will either sell you the external, or use one provided to them. Check out specifications for things like format of the external. FAT-32 will limit the file sizes to ~ 4GB max, and NTSF will have no such limitations. However, if the service bureau is on Mac, and you’re on the PC, their Mac’s can ONLY see FAT-32 HDD’s. Talk this over with the service bureau first, so that there are no surprises later on.
Hope that this helps,
Hunt
PS - also see this FAQ Entry for more detail.

the_wine_snob wrote:
Products, like the Dazzle lineup, just do not seem to work, or work well. I would avoid such.
Although I now have a Canopus ADVC300 I previously used a Magix 'Movies on DVD' USB device. I found the results from this to be particularly good and, to my ageing eyes, I see very little quality difference.
I think this is because Magix use their proprietary high quality codec (from their Pro products) to capture the footage. Like DV-AVI it runs around 10GB+ per hour. This can then, very simply, be exported to DV-AVI Type 2 for use in PRE. Note that there are some sound synchronisation issues with the 'out of the box' settings - but the fix is quick and I posted details to the Magix forum.
Would I revert if I could return my ADVC300 bridge? Probably not - the firewire connection and the PC seeing the box as a camcorder adds to ease of use. In fact I am pleased to have both. There are some things Magix does better than PRE7 (batch exporting each scene as an individual DV-AVI file being just one) and it has smart-rendering which is handy for quick clip splitting/exporting.
Cheers,
Neale
Insanity is hereditary, you get it from your children

How to program encoder readings, using 7344

Hi
I would like to do encoder readings on my motors. I have a 7344 and LabVIEW.
I though 'Read Encoder Position.vi' is the one that I need to use. But I could not find any samples with the vi, and could not understand how to use this VI and read encoder values.
Has anyone performed motor encoder reading on LabVIEW continuously?
Which VIs should I use? Is there any sample?
Can I use external clock and read encoder values at the rate of the sample clock?
Thanks in advance,
Merry

Merry,
'Read Encoder Position' is the correct function to use and there shouldn't be anything special about it, except the fact, that you need to enable the encoder beforehand. Hardware timed readings can be accomplished with the High Speed Capturing (HSC) feature (see examples). Please note, that on the 7344 HSC requires a software re-enable of the HSC circuitry after each occurrence of the external hardware trigger, limiting the effective sampling rate to a value in the region of 200 Hz (depending on the performance of your PC).
If you require faster position sampling rates, you should use an additional DAQ board, like an NI 6220, in an adjacent slot and route the encoder signals to the RTSI bus (PC) or PXI trigger lines (PXI-system).The DAQ board can use these lines to acquire clocked position data with rates of 10 kHz and above.
I hope that helps,
Jochen Klier
National Instruments

Measure rpm and PWM signals using digital input of NI9401 module

Hi, is there a simple way how measure rpm (to 5000 rpm) and PWM (about f=3kHz) signals using digital input of NI9401 (ultrahigh-speed digital I/O) module plugged in NI 9172 ? I will wellcome any suggestions and VI examples (bether still). I'm begginer using LView 8.2. I apologize for my poor English. Many thanks.

Hi CUA,
Since you have already the right tools, you just need to get started with the software. The NI-9401 will give you access to the counters that are inside the cDAQ chassis 9172.
You need to place the module in slots 5 or 6. You can read in how they work and how to configure them in the counters section of the user guide found here.
Now to measure rpm, you can either measure the period of the signal (seconds) and multiply by 60 to have minutes and the number of ticks per revolution. You can find a shipped example to read period called “Meas Dig Freq-Buffered-Cont-Large Range 2 Ctr.vi” found under Hardware Input and Output » DAQmx » Counter Mesurements
To measure PWM, it is similar procedure and you can read the semiperiod (high time or low time). There is also a shipped example called “Meas Semi-Period.vi” found under the same location.
There is great information for these kind of task at this page or just post back if you need to.
Hope this helps.
Gerardo O.
RF Systems Engineering
National Instruments

How to Ignore the signal?

Insert a number if the number of digits of that number is greater than its average return true else false.
So what i'd like to know , (and btw sorry about the other questions) how can it ignore the signal ?
e.g: number_aux = 53 -> this will be: Number of digits: 2
Media = (5 +3) / 2 = 4
( 2 < 4 ) then return false. now i'd like to find a way to insert -53 (negative) and the output must be the same (false) ignoring de signal "-"
here is my code:
In this code if u inserted a negative ( -6 or -53) the output is always true because e takes in mind the signal . How do i tell him to ignore it?
    System.out.println....
      int number _aux =Integer.parseInt(... ....etc
                                          int sum = 0;
          int count = 0;
          int media;
          while (number_aux != 0){
          int digit = number_aux % 10;
          number_aux /= 10;
          sum += digit;
          if(number_aux >= 0) count++;
          media =(int) (sum / count);
          return (count > media);thank you so much.
Josh

I already used my brain LOLO , if new the answer i
would not be here ask for help lol.
shiver You forgot to add three or more exclamation marks.
give me a hint , how to ignore the signal without
that method ( using my code)If I'd give you any number, how would you do it? What would there conditions and formula be? Think about that. Programming isn't magic. It's finding a step-wise solution to a problem and writing it down.

HT1338 how do I turn off optical digital-out port?

how do I turn off optical digital-out port?

Just want to report that I too, running 10.6.5 on a MacBook Pro, had the mysterious " Audio Out Stuck On Optical Digital-Out Port" problem whereby I was unable to adjust the volume on my built-in speakers and they were permanently "muted" because the operating system was sending the audio signal to a non-existent device that it falsely thought was plugged in to my unused headphone jack hole. I thought at first the problem must necessarily be software-based because the built-in speakers worked fine when playing the start-up chimes. So I uninstalled something called "Soundflower" which does some mysterious shenanigans with commandeering the internal audio signal so that one can make audio recordings of one's computers' sound effects. But uninstalling Soundflower had no effect. So I uninstalled some other audio-related software, also to no avail. Then I zapped the PRAM, to no avail.
Then I decided to try what some people call "the toothpick trick," i.e. poking around in the headphone jack hole to see if something was stuck in there shortcircuiting it, and initiating the false signal to the OS.
Bingo! Success!
Actually, I did a hyper-sophisticated version of the toothpick trick:
First, I own a home "otoscope," one of those doohickeys that doctors use to look into your ear. One can now buy amateur versions of otoscopes for home use, to looks for kids' ear infections, etc. (They only cost $30 or so.) Anyway, using the smallest attachment designed for babies' ears, I was able to look (with illumination) into the headphone jack hole and yessiree there was a big bunch of dust stuck way deep in there.
So then I took not a toothpick but instead a slender dental prong-pick thingie made of stainless steel, and very delicately was able to snag the clot of dust deep in the hole at the bottom on the first try. Quite a wad!
Then I took one of those rubber ear-bulbs, used for cleaning out your ears, and used it as a micro-vacuum-cleaner: Squeeze the rubber bulb til it is as empty as can be, then place the tip of the bulb at the entrance to the headphone jack hole, then suddenly release my grip: it ***** air out of the tiniest spaces! After doing this a few times, I then did the reverse and blew blasts of air into the hole.
After all this, I looked back into the hole with the otoscope, and it was sparkling clean! Not even the tiniest speck of dust in an area that just three minutes earlier was thick with dust.
I then turned my computer back on and...problem solved! The audio worked again like normal, and it was no longer detecting an imaginary "Optical Digital-Out Port" device. The internal speakers once again worked as normal, and the volume could be adjusted.
I guess the problem for me really was dust causing a short-circuit. It might very well be the same for you -- so try cleaning out the headphone jack hole as I did.
I'm writing this detailed description to help anyone else in the future with a similar problem.

How to convert analog scalar into digital value

I have the DAQ connected to a system that sends a digital 0 or 1 through the analog BNC connector. If I use DAQ Express VI, I can convert the dynamic data type into a boolean (rather than scalar) array so it's easy to check if the value is 0 or 1. Because I'm running the VI in real-time, I can't use dynamic-to-boolean array conversion. The output I get is a 1-D waveform array which will give me scalar values. The task has a voltage range of -10 to 10 mV. How can I convert that into a 0 or a 1? Should I set the voltage range to 0-5V and simply have an if statement that checks if the value is, let's say, greater than 2.2V (which will mean it's a binary 1)? Is there a better method?
Thanks.

Hi abdel2,
It sounds like you are trying to measure digital data from your system. If that is the case, you should be able to connect to a digital input line if your DAQ card had them. Then you can set up a digital acquisition in LabVIEW that will interpret the signal as a boolean input.
If you are not able to do this, you can approximate the digital behavior by reading analog data, and pragmatically determining a threshold (for example 2.2V), though this is a less efficient way to do it.
Regards,
Stephen S.
National Instruments
Applications Engineering

How to get the last 3 digits of a Delivery Number

Hi All,
On the Transfer Order Collective form, the Delivery Number is printed. But I need to capture the last 3 digits of that delivery number and make the 3 digits to be printed on the same form with bigger font size. I would like to know how to capture the last 3 digits.

If so, your form(subroutine) can look like this.
form get_last_3_digits tables co_sym_using   structure itcsy
                               co_set_symbols structure itcsy.
data: xvbeln type likp-vbeln.
* Get the USING Values
read table co_sym_using with key name = 'LIKP-VBELN'.
check sy-subrc eq 0.
shift co_sym_using-value left deleting leading space.
xvbeln = co_sym_using-value.
* make sure it is internal format
call function 'CONVERSION_EXIT_ALPHA_INPUT'
       exporting
            input = xvbeln
       importing
            output = xvbeln.
* Update the value
read table co_set_symbols index 1.
co_set_symbols-value = xvbeln+7(3).
modify co_set_symbols index 1.
endform.
Regards,
Rich Heilman

How to acquire serial data on a digital input line with good performance?

Hello,
we have a performance problem with our realtime controller. Our objective is, to read a 24-bit long digital waveform from a digital input line. To do this, we supply a clock signal (236 KHz) to the PFI1 Line of our DAQ Board. On each rising edge of the clock, a new bit is set on the digital input DI0.
Our hardware which transmits the data, is triggered through a digital output from our realtime controller. On each edge on this output, the hardware starts a serial transmission of 24-Bits.
Everything works fine except the bad performance of our realtime controller. We want to acquire the 24-Bits in a 1ms timed loop. To measure performance we wrote a test program. In that, we only triggered the hardware and transfered the data to the realtime controller. The task which is doing this job, has a approx. CPU-Load of 30%, which is, in my humble opinion, very high. The task is not waiting for data or anything else! We have earlier implemented a control which is also using a 1ms timed loop. This control is sampling 2 analog input signals, 2 counters. Futhermore it's sending telegrams with CAN and doing many calculations. The strange thing is, this much huger program has a CPU-Load of 25%. Does anybody know where the problem is?
For the better understandig I attached our test-program to this text.
We're using:
PXI-8175 realtime controler
PXI-6221 Multifunction DAQ
Thanks!
Regards,
Crest!
Attachments:
dig_test.zip ‏51 KB

Hello,
First of all 30% CPU-Load is normal because the DAQmx-driver needs a lot of resources.
In your programm you should place a wait (for example with 1ms) into the while-loop which causes
lower CPU-Load.
If this is not enough you should build your vi like in the following example.
Regards,
Christian
Attachments:
Read Dig Port.vi ‏51 KB

How to generarte encoder signals usign digital ouput lines?

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