Digital Triggering With Pretrigger Samples

I am unable to trigger the PCI-6115 using the Digital Trigger A when the number of Pretrigger samples is greater then 0. Everytime I run the VI the acquisition times out. When I set the number of Pretrigger samples equal to 0 the VI works fine. I need to acquire pretrigger samples. What do I need to do to get the card to trigger properly?

EZimney,
Are you currently using the onboard memory of the PCI-6115? Currently, pretriggering is not supported in this mode. Please see the following Knowledge Base article for more information.
How Do I Use the NI 6115 and NI 6120 Onboard Memory to Store Acquisition Data for Later Retrieval?
http://digital.ni.com/public.nsf/websearch/9C419710B6071A6D86256BD600624B83?OpenDocument
Regards,
Justin Britten
Applications Engineer
National Instruments

Similar Messages

Error setting pretrigger samples

I am having problems acquiring data with pretrigger samples when capturing more than one channel.
If I trigger and capture on the same channel (tried 1-4) then it works great, regardless of the number of pre-trigger samples set. If I trigger on channel 4 and capture channels 4 and 1 (passed in that order), with no pretrigger samples set, then it works fine. However, if I trigger on channel 4 and capture channels 4 and 1 (passed in that order), with pretrigger samples set, then I get the following error:
Error -10621 occurred at AI Control. Possible reason(s):
NI-DAQ LV: The specified trigger signal cannot be assigned to the trigger resource.
Searching the forum, I have found a few other people that had the
same
problem
but they did not have solutions. Any ideas?
Solved!
Go to Solution.

What version of the DAQmx driver are you using? Both of those posts that you referenced are rather old, and I know that there was an issue in past versions of DAQmx that was similar to what you are describing. However, it should be fixed if you upgrade to the latest driver (9.0.2, as of right now).
-Christina

Pretrigger samples with keyboard trigger?

Hi,
I am very new to Labview, so this may not be a difficult problem but I can't find the solution. I have built a vi to record sound using the NI USB-6251, but I would like to obtain a certain number of samples prior to a trigger. I see in the DAQmx Reference Trigger VI that there is an option for pretrigger samples, but the only way to trigger this VI is via a signal into one of the channels. This does not work for us because we wish to record all 8 channels at the maximum sampling rate. I was wondering if there is an option for some kind of manual trigger (such as a key or mouse click) to obtain pretrigger samples?
Thanks,
Hannah

Hi,
This is the general method I would suggest:
You could use an Event Structure to read a mouse click or keyboard button press, which in turn, when the event is triggered, would then set a digital output (for example) on your 6251 high, which would be wired into the trigger input for the 6251. This would then start the triggered acquisition. If you have any other questions regarding this I'll be happy to answer them.
Regards,
Dan - NIUK

Can I use the 2 digital triggers on the PCI-6023E to trigger 2 seperate Analog inputs on the same board?

I want to monitor 2 analog DC signals (single point measurements, not a waveform) and I want to use the digital triggers to start the acquisition, 1 trigger for 1 AI. the measurements need to be made at 1Hz, maybe slower. Is this possible with the PCI-6023E?
If not what hardware should I be looking at? I have a total of 6 triggers and 6 AI.

Dimentia,
I would need confirmation on what you want to do:
1) I want to monitor 2 analog DC signals
This means that you will have one Analog Input operation monitoring two channels. Please confirm.
2) single point measurements, not a waveform
Ok, no buffers.
3) I want to use the digital triggers to start the acquisition, 1 trigger for 1 AI
This would mean that a single digital pulse or edge on a single line would start your 2-channel analog input operation. Please confirm.
4) the measurements need to be made at 1Hz, maybe slower.
Hardware-timed or software-timed? 1 Hz could be easily implemented with software timing. But the triggering could force you to use hardware timing. It will not be a problem but it would be good to know.
5) Is
this possible with the PCI-6023E?
Everything I mention above is possible with the PCI-6023E.
6) I have a total of 6 triggers and 6 AI.
This last phrase is what really confuses me and seems to contradict the previous sentences. Does this mean that you will want to perform 6 independent Analog Input operations, with its own triggers (one each)? Will every Analog Input operation have 2 channels?
I'll clarify why this is important:
- Each Analog Input operation can only have one hardware digital start trigger assigned to it.
- Only one Analog Input operation (multiple channels allowed) can be performed per board at any time.
Since the rates are so slow I would recommend that you perform sample all channels within a continuous acquisition and then discard the data that does not meet a certain condition. You could sample the triggers as well and discard those channels for which the trigger has not been received.
These are just some ideas based on my assumptions on the
problem. Assumptions are never a good thing so please confirm on the point s above and we'll try to help.
Thanks
Alejandro Asenjo
Applications Engineering
National Instruments

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.
I have not been able to find any LabVIEW example that shows how to use PFI pin as trigger input.
Using LabVIEW 7.1, NI-DAQ 7.3 on Windows 2000.
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
The two ways of triggering that you have succeded are the analog triggering and digital triggering that you can peform with the PCI-4451.
Regards
Mohadjer

NI6554 Dinamic generation with external sample clock

I am using the PXI-NI6554 to generate a digital signal, as
clock I want to use an external source that I drive in the board via de CLK IN SMB
connector. Always I got the same error (cod: 1074115898) from the “Write” VI
block, the reason is that there is not clock signal or is not detected.
I tried the example “Dynamic Generation with External Sample
CLK” and I have the same error.
The clock signal is in 3,3V logic. The same clock signal
works to acquire via the STROBE pin. I have scoped the CLK and the shape is
quite ok. I have tried the two possible impedances for the CLK input also.
I found one respond (http://digital.ni.com/public.nsf/allkb/884C5A76BA1A474E8625717A0068AA09)
about strange behavior of CLK IN but the proposed solution does not help in my
situation.
Does somebody have an idea about the problem?
Thanks,
Abe

Hi Uli,
I posted to your thread here.
Best Regards,
John Passiak

Can i use Stored procedures and triggers with SDK

hi all
How to use the stored procedure and Triggers with SDK, can i get a sample code
Regards
Salah

Hi, Salah.
Use "Exec" in your query to run procedures.
SAPbobsCOM.Recordset oRS;
oRS = (SAPbobsCOM.Recordset)pCmp.GetBusinessObject(SAPbobsCOM.BoObjectTypes.BoRecordset);
oRS.DoQuery ("EXEC YourStoredProcName");
Triggers are not supported in SDK.
Regards,
Aleksey

Two digital triggers

Hi!,
I´m in need for a little help. My problem is that I´dont know is it possible to use two digital triggers simultaneusly in 6225-daq. I try to do two same tests at same time. PFI4 line should be as a trigger for a line ai20 and PFI5 should be as a trigger for a line ai52. PFI4 and PFI5 lines get rising edges almost simultaneosly but, you can´t be sure which one happens first.
Program should be able to tell if PFI4 and/or PFI5 lines get rising edge at all. If example PFI4 line gets rising edge and PFI5 line doesn´t,program needs to acquire data from ai20 when PFI4 rises. if PFI5 line doesn´t rise in 0,5 s program should not acquire data from ai52 and it should give for example boolean value or something so you can write to file that test to this other device failed.
I can use digital triggers and all is just fine when I get rising edges to trigger lines but when not, program falls.
Attachments:
sama trig linja eri measure linjat 1_11_2005.vi ‏110 KB

Hi Jetfire,
do you know the difference between BMP and JPG?
Size! (And that's the reason BMPs are banned in this forum.)
Just renaming a file doesn't change the dataformat. Please attach real JPGs (or even better PNGs) next time!
Jetfire created a related thread, now with a VI instead of a picture...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Trouble configuring triggers with synchronized AWG and Digitizer

Hi,
I have been working for a few weeks in my project now, and I have a problem concerning the use of triggering options :
I am using a 5412 AWG and a 5142 Digitizer, in a PXI chassis. I have synchronized them using the Ni-TClk blocks provided in Labview. Now, let me explain what I am trying to do.
I need to make sure that the data I will record with the digitizer will be exactly aligned with the start of the sequence I am generating with the AWG. This acquisition is triggered either by the user (let's say a clic on a button) or by an external analog trigger.
I am trying to do that using 2 different kind of triggers : Arm reference trigger and reference trigger.
I am exporting a signal (Marker Event) from the 5412, on the RTSI0 line. This event happens each time the AWG starts to generate a sequence I have defined. I would like the digitizer to trigger off of this event, but only when a event occured first (the user trigger or the external analog trigger). My idea was to generate an Arm Reference Trigger with the "niScope send software trigger Edge", and to "plug" the reference (stop) Trigger on the RTSI0 line.
According to the SMC based digitizers acquisition engine state diagram, the digitizer should start in the idle mode when I initiate the acquisition (with Ni-TCLK Initiate), then it should wait for a start trigger (defined as IMMEDIATE) then it should wait for an ARM reference trigger (the one I want to send by software, or later by an external source). Finally it waits for the reference (stop) trigger which would be the marker event on the RTSI0 line.
According to what I see in my VI, the digitizer seems not to wait for the ARM reference trigger, I guess it directly sees the reference trigger on the RTSI0 line (which happens quite often) without waiting for me to allow it to look for it.
Do you see a mistake in my thinking here? Is it possible to do what I propose? I was thinking that the fact that I use the TClk synchronization might be a source of my problem with the triggers...
If it is not possible to do what I propose, I was also thinking to do what I need another way : Is it possible to somehow combine the 2 events I want to trigger off of? I mean, is it possible to create my own signal which would be high when the external trigger and the marker event are both High, and Low otherwise? And then, route this signal in one of the RTSI lines, which would be the source of a digital triggering...
I hope you will understand what I'm trying to do, and that you will be able to help me.
Thank you very much in advance,
Best regards
Antoine Benard

Hi Antoine,
I have been reading you post for a while and I have concluded
that it will help me a lot if I can have the code; if you were so kind to attach
it to the discussion forum, I will be more than glad to try on my test machine.
“I
need to make sure that the data I will record with the digitizer will be
exactly aligned with the start of the sequence I am generating with the AWG.” In this case, and I will
like to make sure I’m getting this correctly the 5412 is going to trigger the
5142 and either a user control or an external trigger is going to trigger the
5412. In this case the user control or the external trigger is going to start
or stop de generation on the fgen and the fgen will control the scope. So what we really need to do is figure a way of using multiple triggers with the 5412.
I
was also thinking to do what I need another way: Is it possible to somehow
combine the 2 events I want to trigger off of? You can handle this with
another card. Using card with change detection, you can the FGEN trigger from
multiple sources.
I will wait for you answer to make sure I got everything correctly
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters

How can I continuously streaming data to disk with 1MHz sampling rate with PCI 6110?

I can only save 3 seconds data with 1MHz sampling rate using PCI 6110. Is it possible to continuously save longer time data (say 1 minute)?
Many thanks

if the binary file is big the ASCII file is very very very big.
1 measurement is coded in a I16 => 2Bytes ( 4bit is not used 611X is 12bit
card)
if you use +/-1V range the quantum is (2 * 1V) / 4096 = 0.0004883V or 0.4883
mV you need to use 8 digits minimum.
And If your binary file is 1 Mo your ASCII file is 4 Mo.
You can use this VI for inpiration you need to add the translate I16 to DBl
to make a real value before saving.
For Help you can mail inthe newsGroup.
I'am a french user and my english is not good Sorry..
Fabien Palencia
Ingenieur d'etude ICMCB CNRS
"StephenZhou" a ?crit dans le message de news:
506500000005000000A5AF0000-1031838699000@exchange.ni.com...
> Hi, Fabien Palencia
>
> The program is great.
Do you happen to know how to convert the big
> binary file to ascii file? Thanks
[Attachment recup data I16.vi, see below]
Attachments:
recup_data_I16.vi ‏57 KB

Digital triggering

By using pulse train during raiging edge, by digital triggering i have to write to digital port and during lowering edge, by analog triggering i have to aquire the data. how i can achieve with the PCi6036E and DIO-31HS?

Greetings,
I am not sure that I totally understand your application. Do you want to output a digital pattern with your 32HS on the rising-edge of a digital trigger and then acquire data with your 6036E on the falling edge of that same trigger?
Let me know if this is correct or not.
Spencer S.

NI 5761 with low sampling rate

Hi, is it possible to change the NI 5761 sampling rate without programming FPGA? Thank you very much!

Hi, as mentioned above you can play with the sample rate by using an external Sample clock. Take a look at the picture attach for the general idea. Simply replace the Boolean buttons for digital input ports. I hope this helps
Alejandro | Academic Program Engineer | National Instruments
Attachments:
Capture.JPG ‏256 KB

Hiow to build digital waveform with transition values bigger U32?

Greetings!
Is that possible to build digital data with transitions values represented bigger than U32 values? (It seems to me that Labview 8.0 cannot accept U64. See attachment.)
What do you recommend? I cannot change dt, so scaling does not work. This is because, the record length could be very long...and the waveform should be connected to a digital waveform graph.
Thanks in advance!
Attachments:
ReplaceTransitionValues.jpg ‏21 KB

Hello Dawid,
Thank you for the answer.
Yes, I'd like to build a big array, which although would not be so big... I have not so many samples (just a few thousands) but the samples could be very far from each other. That's why I need U64.
I'm using compressed digital waveform to transport and display the samples, where the transition value functions as an offset (counted in dt) from the first sample.
For example, to store a 1Hz signal with sampling rate 100MHz the transitions will accumulate by 50M. If the record has 1000 samples then the last transition value will reach 50G which is much bigger than a U32 can store.
You might ask why so high the sampling rate for a 1Hz signal... The signal is stochastic, could be faster, and I would like to keep tha fast pulses also.
I dig into the "Append digital samples.vi" (see attachment) and I found the transition array is build by U32... I hope I did not misunderstand you, but I think it does not help. I suspect even the Digital Waveform Graph itself is not able to accept values over the U32 range, however, I should try that.
Best Regards,
Lamaze
Attachments:
AppendSamples.jpg ‏155 KB

R507 Digital Camera with Windows 7

HELP! I have an HP R507 digital camera with a SunDisk 64 MB memory card. Recently, I upgraded my O/S to Windows 7 , updated the drivers, and replaced the batteries in the camera. For some reason, the camera's memory will not empty after I download pictures. WHAT SHOULD I DO?? RSVP! Thanks! Jim
This question was solved.
View Solution.

I have solved the problem! Thanks!! Jim (Namaycush)
WHEN ALL ELSE FAILS, READ THE INSTRUCTIONS!!

Digital Output With Timer (Simulation)

Hello everyone, I just learned how to make LabVIEW program a week ago. I try to make a simulation of Digital Output by LabVIEW (my attachment). In this simulation I have a slider as an input (0-10 V), two numeric control (upper limit and bottom limit), a waveform chart that plot those 3 value, and two boolean LED (P0.0 and P0.1) as an indicator. In this simulation you can fill any number (between 0-10) in the numeric control as a limit for your slider input. If the input from a slider exceed those upper and bottom limit then the boolean LED will turn on, P0.0 if exceed upper limit and P0.1 if exceed bottom limit. The problem is I don't know how to make timer for those boolean LED. As example:
1) Make an input from slider,
2) If input (1) exceed the upper limit,P0.0 will turn on for 5 second,then turn of for 10 second,
3) If in that 10 second you change the input back to normal (between upper and bottom limit) then P0.0 will stay turn of until the input from slider exceed the upper limit again,
4)If in that 10 second you didn't change the input (stay exceed the upper limit) then P0.0 will repeat the process (2) until you the input from slider back to normal.
(Same process for input that exceed the bottom limit).
Can you help me to make this timer? Thank You (I'm sorry I made a double post):newbie
Regards
Juventom
Attachments:
Digital Output With Timer.vi ‏16 KB

Hello Juventom,
As I understand it you want to be continuously checking the value of the sliding bar and comparing that to the upper and lower limit controls whilest also chaning the LED booleans to true for 5 seconds then false for 10 seconds if the sliding bar value is outside of the limits.
To do this you would probably be best using a parallel loop design, where you have 3 while loops in place of the one you have currently. Each one of these while loops would be responsible for a part of your program (e.g. the top one would display your values on the graph and the second one who check the sliding bar value against the upper limit and then turn on the LED, etc)
I've found this tutorial about multiple loop programs and I think you should look at the section entitled "Parallel Execution"
http://zone.ni.com/devzone/cda/tut/p/id/3749
This way you can use normal delay VIs but when they run they only pause that loop rather than the whole program.
Please let me know how you get on with this, and ask me if you need further help.
James W
Controls Systems Engineer
STFC

Digital Triggering With Pretrigger Samples

Similar Messages

Maybe you are looking for