PXI-6230 analog input trigger setup

Hi,
Can anyone point me in the right direction of how to configure the PXI-6230 card to implement 3 of the analog input channels as a digital input trigger? The input to each channel is TTL pulses. I want to have a trigger event on every pulse from any of the three inputs. I'm using LabVIEW 8.5. Any help is appreciated. Thanks.

Hey HarveryL,
I'm not sure it is possible to do this. Can you give me some more details on your application, and why you want to use the analog inputs as a digital trigger? Here is an article on how to use PXI triggers with the analog input and output, perhaps you can adapt that code to your purposes. I'll continue to look into this for you, but any more information you can provide would be appreciated. Have a great week!
John B.
Embedded Networks R&D
National Instruments
Certified LabVIEW Developer

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Hi,
I'm trying to start and to stop a data aquisition by using an analog input trigger. I'm using NI-USB-6251. At input channel ai0 is a sin-signal connected. At input channel apfi0 is an analog trigger signal connected. I can start the trigger signal by pushing a button on my frequency generator. Here's a part of my code:
Hi,
ich versuche eine Messung mit einem analogen Eingangssignal zu starten und zu beenden. Ich benutze die Messkarte NI-USB-6251. An Eingang ai0 ist ein Sinus-Signal angeschlossen. An Eingang apfi0 ist der Triggereingang angeschlossen. Das Triggersignal löse ich immer per Tastendruck auf dem Funktionsgenerator aus. Hier ist ein Teil des Quellcodes:
TaskHandle taskHandle = 0;
int32 read;
float64 *data;
float64 sampleRate = 1000; //Samples per Channel per Second
uInt64 sampsPerChan = 4000; //Samples per Channel to read
int sumOfChan = 1;
double triggerLevel = 2.0;
double min = -0.2;
double max = 0.2;
double timeOutReadAnalog = 10.0;
void calculate()
DAQmxCreateTask("", &taskHandle);
DAQmxCreateAIVoltageChan(taskHandle, "/dev1/ai0", "", DAQmx_Val_Cfg_Default, min, max, DAQmx_Val_Volts, NULL);
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DAQmxCfgAnlgEdgeRefTrig (taskHandle, "/dev1/apfi0", DAQmx_Val_RisingSlope, triggerLevel, 3000);
DAQmxStartTask(taskHandle);
if( (data=malloc(sampsPerChan*sumOfChan*sizeof(float64)))==NULL )
MessagePopup("Error","Not enough memory");
//set start and stop trigger
//set breakpoint here
DAQmxReadAnalogF64 (taskHandle, -1, timeOutReadAnalog, DAQmx_Val_GroupByChannel, data, (sampsPerChan * sumOfChan), &read, NULL);
I've choosen the sample rate (1000/s) and the samples per channel (4000), that the aquisition needs 4 seconds to be complete. I can start the aquisition by Start-Trigger, but I think I have a problem with the function DAQmxCfgAnlgEdgeRefTrig. Actually the array will always be filled with 4000 values. I thought I can start the aquisition by triggering once and e.g. after two seconds triggering again for stopping aquisition with result of 2000 values in the array. I hope you can help me with this problem.
Ich habe die Sample Rate (1000/s) und die Samples pro Kanal (4000) so gewählt, dass die Aufzeichnung 4 Sekunden dauert. Ich schaffe es auch die Aufzeichnung über den Trigger zu starten, jedoch funktioniert das Stoppen mit der Funktion DAQmxCfgAnlgEdgeRefTrig nicht. Aktuell ist es so, dass das Array immer mit 4000 Werten gefüllt wird.
Ich hatte mir erhofft, dass ich durch einmalige Triggerung die Messung starten kann und beispielsweise nach zwei Sekunden erneut triggere und die Messung damit stoppe und dann nur 2000 Werte eingelesen habe.
Ich hoffe, ihr könnt mir dabei helfen.

Hi Martin,
I looked over your code and noticed that you called the function without checking the returnvalue.
Try to change the line to the following:
First: define a new int32 value and call it for example: errorcode
Second: The function returns a status code, wich if it fails, includes an error code so save this code in the new generated value
errorcode = DAQmxCfgAnlgEdgeRefTrig (taskHandle, "/dev1/apfi0", DAQmx_Val_RisingSlope, triggerLevel, 3000);
and try to run the programm and read out this value.
If you got this value, please post it here and I will try to help you if I can.
Regards
Philipp

How to catch an analog hardware trigger from the PFI0/TRIG1 pin?

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Hi,
look into Help!
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Trigger AI Task Off DO Edge.vi ‏32 KB

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How to use counter output pulses to trigger analog input?

Hello all,
I hope the kind people using this forum can help me, a lowly beginner LV programmer! I have been attempting to create a VI that produces a user defined number of TTL pulses, separated by every n seconds. Each TTL would be outputted to a stimulator, which in turn generates its own TTL. Using the stimulator-generated TTL, I would like to trigger finite analog data acquisition (e.g. for every TTL, trigger the collection of a data sweep that contains 4000 samples (collected at 4000 Hz), with 1000 samples collected pre-trigger. I would like to also be able to see each data sweep as it is triggered on a chart. As I understand things (lots of online/book/forum reading), I should be using the counter output to generate my TTL pulses, and syncing each counter produced TTL with analog input, as well as using a reference trigger. Also, the AI part should be started first, so that I don' t miss any counter outputs. If it matters, I also need to use one of the AI channels to acquire the TTL, so I can see my stimulator-induced responses to the stimulator in time.
I am able to generate the TTL pulses from the counter output, but I am having a problem with the AI part. I am unsure how to sync the counter output with AI. Also, since I need to acquire pre-trigger samples, I would be needing to acquire samples continuously, but when I set 'continuous samples' on daqmx timing, the VI doesn't work (hence why's its set to 'finite samples').
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Hello,
Due to the fact that analog tasks themselves are not retriggerable, a
pulse train produced by a counter is always used as the sample clock
for the analog input task in order to recreate a retriggerable effect
for analog input. This can be done by creating a finite pulse train set
to retriggerable using the DAQmx Trigger Property Node, or the pulse
train could be continuous and just be gated by another signal. Neither
of these methods can be properly applied in hardware to create a
retriggerable reference trigger. You can however implement something
similar in software by just stopping and restarting your reference
triggered analog input task within a loop. There will be some delay
between when the task is stopped and restarted, as these events require
software intervention, but if there is enough time between when each
trigger signal is generated, there should not be any noticeable delay
or missed samples.
I have attached an example of this!
Mark B
===If this fixes your problem, mark as solution!===
Attachments:
RC001 v_1mod.vi ‏25 KB

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Is this a continuous acquisition?
I am not aware of a function querying the trigger state of a task. Nevertheless, i don't think this is necessary as you usually start reading right after starting the input task.
So in case a trigger is late, you will/should run in a time out error. Otherwise, you will get some data which is a clear indication that the task is running....
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Hi, iam facing proble in synchronizing 4 ni 4472 cards input with pxi -6052e analog output. please help me out to sort out this problem

hi, iam facing problem in synchronizing 4 ni 4472 cards input with pxi -6052e analog output. please help me out to sort out this problem

Hi achyuth,
Thank you for posting on the National Instruments forum.
I am not sure what you are trying to do. Are you trying to input and output at the
same time? Are you just trying to
synchronize all of your inputs? Do you
want them to run off the same clock? If
you could, give me some more information so I can understand your problem
better.
In the meantime, this might help you:
PXI Timing,
Triggering, and Synchronization Capabilities of E-Series Multifunction Data
Acquisition ...
PXI Timing and Synchronization
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How to trigger from analog input channel

I am using a BNC-2110 into a 6062E card. And I am sure this question has been posted several times but I was unable to find a clear answer. I am trying to use the devices ai0 channel as my trigger source. I tried using a voltage source in the trigger reference, and that almost works but it only works for several loops before coming up with an error. If someone knows what I may be possiblely doing wrong or where to find this information, any assistance would be great.
- there is always an easy way, but it is always the hardest to find

Hey Henry,
The BNC-2110 is just the connector block. What card do you have the is interfacing this block with your computer? (should be a PCI or PCI-express card). Are the GPS receivers outputting digital signals that conform to TTL compatible logic levels (are the signals 5V or 0V with no more than 1.6mA of current)? If they are outputting a digital signal, then you can send these signals into any of the PFI lines to act as a trigger (or to the trigger lines).
For example, if you would like to perform an analog acquisition each time the trigger hits and have an X series card, you can open up example finder (help»find examples...) and then open Hardware Input and Output»DAQmx»Analog Measurements»Voltage»Cont Acq&Graph Voltage-Int Clk-Retriggerable.vi. Then make sure your Trigger Source parameter is set to the same PFI line that you are sending your GPS signal to (on the BNC-2110, the trigger connections are really just PFI0 and PFI12, but these are common lines to use for triggers, but any PFI line will work). If you have an M series card, and cannot do retriggerable analog input, you can reference this example for how to use counters to workaround this limitation of our M series cards: https://decibel.ni.com/content/docs/DOC-6801
If your GPS signal isn't digital, and is some arbitrary analog square wave, you can use an example like this: https://decibel.ni.com/content/docs/DOC-4657 to use the analog value to trigger you're reading (you just need to set the appropriate window for your analog signal in the VI). I hope this helps!
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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

Analog input generating trigger on the counter gate to measure frequency

Hello,
I want to measure a frequency on the analog input but it doesn't seem to work.
I'm trying to get it working using DAQmx with the use of ansi c.
The
first step I made was acquiring the information on the analog input.
With the use of a simulated device this shows a sine wave on the input.
My next step was to generate a trigger signal for the counter, but this doesn't seem to work.
I don't see how it is possible to connect the trigger on the analog input to the counter.
For the creation of the analog input and trigger I use the following code:
    DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
    DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-3.0,3.0,DAQmx_Val_Volts,NULL));
    DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",10000.0,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,1000));
    DAQmxErrChk (DAQmxCfgAnlgEdgeStartTrig(taskHandle,"Dev1/ai0",DAQmx_Val_RisingSlope, 0));
For the creation of the counter I am using the following code:
DAQmxErrChk(DAQmxCreateCIFreqChan(taskHandle1,"Dev1/ctr1",
"",1,2000,DAQmx_Val_Hz ,DAQmx_Val_Rising ,DAQmx_Val_LowFreq1Ctr ,1,4,"");
I hope some one could give me a hint.
I have also tried the examples that come with DAQmx but far as I know this are only counter examples using digital inputs.
Thanks in advance.
Solved!
Go to Solution.

Hi,
You have to use the comparison event output to the counter input. Change this property after the configure channel function.
DAQmxSetChanAttribute (taskHandle1, "", DAQmx_CI_Freq_Term, Dev1/AnalogComparisonEvent);
Regards,
Bas

Programming Analog Input Registers for MSeries NI-6221

I am trying to understand the Preliminary M Series Register Map in order to correctly setup and acquire data from the Analog Input channels of my PCX-6221 card. I have been able to figure out the DIO locations and use them but I am having trouble understanding what I have to do to configure and acquire data using the Analog Input registers of the card. I need to program at this level for an RTX application using Microsoft Visual Studio Net 2003 and have had great success doing so with other NI Cards. I have tried looking at the examples provided by the MDDK but I haven't been able to create a environment that allows me to compile them with Chipobjects and it appears like alot of the work is hidden by the subroutines.
I wonder if someone had a high level algorithum using the Register Map it would help out alot.
Questions:
How would I create a multiple channel Scan List and load it into the card setting gain etc...
How would I configure the card to acquire continously at a specified freq (ex 1000 samples a sec)
How would I start/stop acquisition
I would guess getting the status of the FIFO and accessing the FIFO is a matter of reading the AI_STATUS_1 and AI_FIFO_DATA locations
Would looking at the Register Programming Manual for the "E" Series help me or just get me more confused?
Thanks in advance for any light you can shed on the subject.
Floyd

Hi Floyd-
Let me address your questions individually:
How would I create a multiple channel Scan List and load it into the card setting gain etc...
A multi-channel scanlist can be created as shown in the method aiConfigureChannel() from ai.cpp in the M Series MHDDK \Examples folder. Note that the other operations leading up that point (notably, aiClearConfigurationMemory() must be performed in the order shown in the various AI examples. aiex3.cpp is the most useful starting point for investigation, in my opinion.
How would I configure the card to acquire continously at a specified freq (ex 1000 samples a sec)
aiex3.cpp shows how to setup the device and its DMA controller (aka the "MITE") for DMA operation. In order to configure for continuous operation you set the "continous" flag in that example to kTrue. The effect of that setting is to program the STC-II to generate either a finite or continuous AI sample clock. This programming is performed in the function aiNumberOfSamples() from ai.cpp and has the effect of setting the appropriate bitfield for continuous operation in the AI_Mode_1 register.
Earlier in your post you asked if the STC Technical Reference Manual ( http://digital.ni.com/manuals.nsf/websearch/E929838D7D0EE50986256728007FEADF ) would be a good reference. In fact, it's a great reference from the perspective of understanding the bitfield/register names and understanding the basics of how the timing hardware works (for example BC, UC and other sample counters are all functionally equivalent in the STC and STC-II). From the perspective of actual register writes and reads, the functionality is different between E Series and M Series. The biggest difference, as another forum user alluded, is that we map and write directly to the registers on M Series so Windowed_Mode reads and writes are no longer necessary.
Another difference between STC and STC-II is that the STC-II uses NI TIO-style counter/timers. For that reason, the NI 660x RLP manual ( http://digital.ni.com/manuals.nsf/websearch/4CE1C778F442B01386256C870060F9F3 ) would be a good reference for M Series counter/timer operations.
How would I start/stop acquisition
Assuming you don't need an external start trigger, you only need to write to the strobe bit AI_Command_2->AI_START1_Pulse. This will create a single start trigger pulse internally. The differences between AI_START1 and AI_START are described in the STC Technical Reference Manual.
A finite acquisition would be stopped automatically by the AI timing engine based on the number of samples you program via the method shown in aiNumberOfSamples(). Continuous AI would be stopped by first stopping the DMA operation and then calling aiReset().
I would guess getting the status of the FIFO and accessing the FIFO is a matter of reading the AI_STATUS_1 and AI_FIFO_DATA locations
Yes, this would work but I would strongly suggest using DMA as shown in aiex3.cpp. If you want to use "programmed I/O" to read the FIFO data directly, that method is shown in aiex2.cpp
Would looking at the Register Programming Manual for the "E" Series help me or just get me more confused?
In many cases it would be very helpful. See my comments, above.
I have inherited code that works on 65xx cards which I am pretty sure uses windowed mode that I am using in this 6221 driver. I have found that I can set the PLL registers to act as DIO and I can read the Discrete inputs just fine. Makes me curious, if Windowed mode is not used doesn't that mean the addresses are relative to the BAR1 address? Why then am I able to read the DIO?
I'm not sure why this would work- it's possible that some legacy functionality is still working due to the way you access the hardware in your code. For full functionality with M Series you must use mapped memory I/O to write and read from the device's registers.
Also starting with Clock_and_FOUT according to the example I set it for Slow_Internal_Timebase. But when I read back that Address it is always zero. According to the register map it is a "write". Does that mean I can't read it's contents? Or do I seem to have a problem because I am trying to use windowed mode with this card.
Yes, the "write" registers are write-only and the "read" registers are read-only. The effect of data read from or written to "write" or "read" registers, respectively, is undefined.
Hopefully this helps-
Tom W
National Instruments

PXI-6230 analog input trigger setup

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