Analog trigger with NI9205 PFI0

I have a problem to trigger an analog acquire with NI9205 (C module in Compact DAQ)
i use the PFI0 line, but the acquire don't start when i send a trigger gignal (5 to 0V)
the error:
could you help me?
Thanks a lot!

You set your task up to run at a rate of 2400 samples per second, and request 64 samples to be read. This means that it will take at least 37.5ms to take the data.
Your DAQmx Read function has a timeout of 10ms set. This means that the read will always timeout before the required samples are read as the error is indicating.
For this configuration you should not need to wire the timeout setting of the DAQmx read at all, I recommend removing that input!
Craig H. | CLA | Systems Engineer | National Instruments

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I think it is possible to set more than 38 pre-trigger scans on a single 4472 card. I've done this before. You can verify this by running the Labview example "Acquire N - Multi-Analog Hardware Trig.vi" which comes with LabView.
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Monitor multiple channels for analog trigger with DAQmx drivers

Hello! I would like to start a data acquisition of multiple analog channels (16) from an analog trigger. I would like trigger to monitor four of the (same) channels, and trigger when any one of them reaches a certain voltage. I found an example that would work with the Traditional DAQ drivers (using occurances), but can't figure out how to do something similar in DAQmx.
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Hi Denise-
After some research, I have found that it is not possible to use the functionality of DAQ Occurrences in DAQmx. Ironically, the reason that this functionality is available in Traditional and not DAQmx is due to the exploitation of an inherent limitation of Traditional that was upgraded in DAQmx. The multi-thread capability of DAQmx is a major advantage for most applications, but in this case it prevents the use of occurrences as they existed in Traditional DAQ.
In short, this means that you can't directly use this functionality in DAQmx. You can however emulate this functionality with minimal software analysis of the incoming signal. I have attached a modified example VI that logs data to a chart only when the analog level of one of the channels being measured has exceeded a user-defined reference value. Basically, the task is running continuously in the background but the data is not actually logged until the signal is above a predetermined "trigger" level.
Please let me know if the attached example is helpful for your application. You will see the input channels listed in the format "DevX/ai0:y" where X is the device number and y is the highest channel number of interest.
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Attachments:
Cont Acq&Graph Voltage-Int Clk Analog SW Trigger.vi ‏83 KB

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Hello Russ,
The M Series 6229 should be able to support hardware analog triggering. Take a look at the following example to see how to accomplish this in LabVIEW.
http://venus.ni.com/stage/we/niepd_web_display.DISPLAY_EPD4?p_answer=&p_guid=DC9C549F7FDC1973E034080020E74861&p_node=DZ52000&p_rank=&p_source=External&p_submitted=N
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How to do an analog trigger with bipolar levels of detection and start acquisition with pre-trig samples

hello,
I use PXI 4472 with accelerometers. I want to trig as soon as the acceleration is out of the window +/-50g and recover the previous samples before the trig. Is it possible to do it?
I try the daq-mx functions trig on analog windows and a number of pretrig samples but without success. My first sample detected is always over 50g, it seems that the number of pretrig samples has not recognized. Anyone to help me?
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Hi Chouca,
It should be possible to do what you are trying to do:
type of trigger: analog window triggering (acquire data when the signal leaves the window)
Action caused by trigger: reference trigger
I will try and get a 4472 to check that by myself.
Maybe it would be easier to check the behaviour of the system with a precise voltage generator instead of the accelerometers.
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National Instruments France
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Error 89131 while trying to analogue trigger with NI9205

Hi Guys,
I have an NI 9205 mounted in an NI cDAQ-9178 chassis which I'm trying to use to supply an analogue trigger to a data capture task I'm implementing. I followed the instructions in http://digital.ni.com/public.nsf/allkb/851828B06A20E01B862571DA0005591A to set up the NI9205 to provide a digital trigger to a second input channel when the analogue level exceeds a certain threshold. However, when I run the vi I get the following error:
Error -89131 occurred at DAQmx Start Task.vi:1
Possible reason(s):
An attempt has been made to perform a route when the source and the destination are the same terminal.
In many cases, such as when configuring an external clock or a counter source, you must select a PFI, PXI Trigger, or RTSI line as the source terminal.
Property: Start.DigEdge.Src
Property: Start.DigEdge.Edge
Source Device: cDAQ1
Source Terminal: ai/StartTrigger
Task Name: _unnamedTask<31>
I'm not sure why this is happening, since I'm following the white paper instructions. Does anyone have any ideas? I've uploaded the VI for you to take a look at.
RB
Attachments:
DAQmxtest.vi ‏28 KB

Hi RottenBorough,
The error you are getting clearly refers to the ‘Start.DigEdge.Src’ property, which means the ‘DaqMx start trigger’ polymorphic VI is used in the ‘start digital edge’ configuration in your code. I could not find this VI used in this configuration in the file you have attached. Are you doing this in another part of your code? Also I have the following questions after going through your VI:
1) Is there any specifc reason why you are generating a counter pulse output and not using it? I feel you would not need this if you are just trying to trigger another task using analog triggering.
2) Also, I noticed that you have not used the cDAQ internal digital edge ( for eg: /cDAQ4/ai/Start Trigger) to trigger another task (as mentioned in the KnowledgeBase article).
One reason I can think of for this error is, you might be trying to set a source for your ‘DaqMx start trigger’ through the external terminal, while it has already been configured to use this source because of the option selected through the drop down arrow of this polymorphic VI. But as I have mentioned before, I do not see you setting up digital edge triggering in the code you have attached. It is worth checking if you are doing such a thing in another part of your code.
Thanks and Regards,
Supreeth.K
Applications Engineer
NIUK

Problems with setting up analog trigger with NI 6289 with VB6 [with error 200265]

I have been trying to synchronize an analog input read with an analog signal generated by the Multifunction DAQ (NI 6289). Basically, the voltage AO signal is fed into a laser and the resulting intensity profile is read into a photodiode, which generates an AI signal read back into the DAQ. The two channels have the sampling rate and buffer size / number of samples.
However, triggering has presented with some problems; the manuals were not very clear on the subject of connecting channels, and no sample programs exist so far that demonstrate this on VB6.
What I have tried is physically connecting /Dev2/ao0 with /Dev2/APFI0, ( Dev2/ai0 is connected separately). Below is a little snippet of code:
'initialization goes here
    DAQmxErrChk DAQmxCfgAnlgEdgeStartTrig(inputHandle, "Dev2/APFI0", DAQmx_Val_Slope1_RisingSlope, txtOffset.Text)
    DAQmxErrChk (DAQmxReadAnalogF64(inputHandle, numSampsPerChannel, 10#, DAQmx_Val_GroupByScanNumber, dataBuffer(0), numSampsPerChannel, sampsPerChanREAD, ByVal 0))
    DAQmxErrChk DAQmxWriteAnalogF64(outputHandle, numSampsPerChannel, False, 10#, DAQmx_Val_GroupByScanNumber, optData(0), sampsPerChanWritten, ByVal 0&)
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I received the following error, -200265, "attempting to use an invalid analog input trigger", at the line ReadAnalogF64.
Attached is the code I used for the triggering event. Any help would be greatly appreciated.
Attachments:
Trigger method.txt ‏2 KB

Refer to this thread please.
Message Edited by Chris W. on 04-10-2009 10:32 AM

Analog trigger with 6071e in C

I'm using the NI6071e MIO board and what I need is to perform SCAN_Op continously on 4 AIs. When a trigger of 1.1V reached in AI2 - stop trigger, I need 300 samples pretriggered plus 200 samples of poasttrigger data (total of (300+200)*4 = 2000 samples. I'm writing code in C, using the Microsoft VisualStudio and the traditional NI-DAQ library. Does anyone can explain on how I should perform it? Does anyone have similar code?
I've been directed to a LAB View example that unfortunatly I can't read.
Thanks,
Nir.

Hello,
I'll try to offer some tips. It looks like you are trying to set up two different triggers for an analog input. This can not be done. Some different options for you are to use pause triggering, reference triggering, or some sort of software triggering. Pause triggering will allow you to collect data when the voltage is above (or below) some trigger value. When the voltage drops below (or above) the trigger value it will no longer acquire data. Another option is using a reference trigger. You can set up a reference trigger to acquire a predetermined number of data points before and after a trigger. Another option might be to use your analog signal as a start trigger for a continuous acquisition. Then, in software, monitor the data being acquired from the trigger channel. When the trigger channel acquires some data that is below your trigger level, stop the acquisition in software (after you have acquired all of your post-trigger data points). I hope this information helps!
-Alan A.

How to synchronize two analog output with USB-6353 sharing a trigger

I'm have the need to synchronize two analog output on the same device (USB 6353) sharing a trigger signal on PFI0.
The programming environement is Visual C++ , and the code I wrote is as following:
DAQmxCreateTask ("", &Ao0TaskHandle); // is the task handle for the analog output Ao0
DAQmxCreateVoltageChan((Ao0taskHandle,"Dev1/Ao0","",-5.0,5.0,DAQmx_Val_Volts,NULL);
DAQmxCfgSampClkTiming(Ao0taskHandle,5000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000);
DAQmxCfgDigEdgeStartTrig(Ao0taskHandle,"/Dev1/PFI0",DAQmx_Val_Rising);
DAQmxCreateTask ("", &Ao1TaskHandle); // is the task handle for the analog output Ao1
DAQmxCreateVoltageChan((Ao1taskHandle,"Dev1/Ao1","",-5.0,5.0,DAQmx_Val_Volts,NULL);
DAQmxCfgSampClkTiming(Ao1taskHandle,5000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000);
DAQmxCfgDigEdgeStartTrig(Ao1taskHandle,"/Dev1/PFI0",DAQmx_Val_Rising);
DAQmxWriteAnalgF64(Ao0taskHandle,1000,FALSE,10.0,DAQmx_Val_GroupByChannel,AOdata,NULL,NULL); AOdata is a buffer containing a sinwave
DAQmxWriteAnalgF64(Ao1taskHandle,1000,FALSE,10.0,DAQmx_Val_GroupByChannel,AOdata,NULL,NULL);
DAQmxStartTask(Ao0taskHandle);
DAQmxStartTask(Ao1taskHandle);
What happen as result of the code is that only the Ao0 channel get the sinwave output , but not the Ao1 . It seems the two channels are not synchronized.
What is wrong in my code?
Please any help non referred to a LabView soloution , first because I'm not a LavView programmder and secondly the project impose C++ as the unique environement.
Thanks
Enky

It will depend on what you are programming the NI 5112 device with.
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C:\VXIpnp\WinNT\NISCOPE\Examples\c\MStudioC++\5112Sync
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Brian
Attachments:
Multiple_NI_PXI-5112_Synchronization_Demo.llb ‏151 KB

I use a PCI MIO 16E board with an analog trigger. So I wire chann

el 0 to the PFIO line, and I enter "PFI0"as the triggering channel on the front panel , I put a level,and I declare channel0 and 1. When I do a DAQ it seems that PFI0 detects the signal as I haven't a timeout, but it doesn't trigger off at the good level.

el 0 to the PFIO line, and I enter "PFI0"as the triggering channel on the front panel , I put a level,and I declare channel0 and 1. When I do a DAQ it seems that PFI0 detects the signal as I haven't a timeout, but it doesn't trigger off at the good level.I noticed you posted an earlier question that generated several responses about the valid sources of an analog trigger. Was there a reason you decided to use the PFI0 option over just telling LabVIEW to use Analog channel 0 as the trigger source? At what voltage level are you wanting to trigger?
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-Drewksi

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Hi,
look into Help!
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Don't forget to give Kudos to good answers and/or questions

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Thank you very much!!!

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Analog trigger with NI9205 PFI0

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