AO Generation using Pause trigger

Hi all ,
I'm trying to do an Analog Generation with my X-Series NI-6356 DAQ ,
My problem is that I want to make 5 tests each one with 200 points that reflects as a linear wavee for the AO.
I'm using DAQmxWriteAnalogF64 but this command is too slow 100 ms over USB!
And I don't have that time.
So I Want to use a Pause trigger.
I'll set a buffer of 1000 points and I want to make 5 tests:
test 1 - AO of 1-200 from the buffer
test 2 - AO of 200-400 from the buffer
test 3 - AO of 400-600 from the buffer
test 4 - AO of 600-800 from the buffer
test 5 - AO of 800-1000 from f the buffer
my questions are :
1. Is it possible ?
2. Is there any example I can use ?
Kobi Kalif
Software Engineer

Kobi-
Can you post some pseudo code so that I can get a better understanding of your intended program?
Thanks,
Sean
Applications Engineering Specialist - Semiconductor Test
National Instruments

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Edge counting with digitial pause trigger

Hi
I should write a program for edge counting with digital pause trigger in visual basic. I have found an example of using pause trigger in edge counting but it is written in C#.
Steps in the program followed is:
1) creating task
2) creating count edge channel objecy
3) configuring thr trigger ( where i have been strucked)
code in c # is:
taskname.triggers.pausetrigger.digitalleveltrigger ( source, level)
When i tried to look for trigger function and to configure it in Visual Basic, I have not found any trigger function to set/configure in the function library
Thanks

Hi there,
Here is the code in text format. That's pretty much all you need. I took the example code called CntDigEvents.vbp and added the following code before the start task function call:
    DAQmxErrChk DAQmx.DAQmxSetPauseTrigType(taskHandle, DAQmx_Val_TriggerType6_DigLvl)
    DAQmxErrChk DAQmx.DAQmxSetDigLvlPauseTrigSrc(taskHandle, "PFI0")
    DAQmxErrChk DAQmx.DAQmxSetDigLvlPauseTrigWhen(taskHandle, DAQmx_Val_Level1_High)
As for the C# code I am not familiar with C# so I don't think I can be a great help on that one.
myTask.Triggers.PauseTrigger.ConfigureDigitalLevelTrigger(triggerSourceTextBox.Text, gateLevel) This function is the main call for the pause trigger and all it is doing is setting the properties. triggersource should be along the lines of "PFI0" or "Ctr0" and gate level defines whether the gate level is "high" or "low)
How is the VB code going?
AdamB
Applications Engineering Team Leader | National Instruments | UK & Ireland
Attachments:
VBcode.txt ‏4 KB

Abort inserting a record in a table using a trigger

Hi there,
Is there any way to abort inserting a record in a table using a trigger?
For full details, I have the following table ("myTable"):
BSC INTEGER NOT NULL,
BTS VARCHAR2(20) NOT NULL,
INFO1 INTEGER,
INFO2 INTEGER
myTable_PK = PRIMARY KEY (BSC,BTS)
I have also a stored procedure that imports a data from text file and inserts them to the specified table (using UTL_FILE package). The stored procedure works great.
But the thing that in the text file itselft it might be (due to third-parity report generation bug) that the primary key will be violated or the BSC/BTS field has null value. In such case I just want to ignore the insertion statement using a trigger.
Thanks

Ok Jens, could you tell me what exception could I use?
Below a protion of my StoredProcedure.
CREATE OR REPLACE PROCEDURE update_myTable() IS
FHANDLE UTL_FILE.FILE_TYPE;
BSC INTEGER;
BTS VARCHAR2(20);
INFO1 INTEGER;
INFO2 INTEGER;
BEGIN
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LOOP
UTL_FILE.GET_LINE(FHANDLE,STR);
-- Process the line STR and generates BSC, BTS, INFO1, and INFO2 values
EXECUTE IMMEDIATE 'INSERT INTO myTable VALUES(:1,:2,:3,:4)' USING BSC,BTS,INFO1,INFO2;
END LOOP;
EXCEPTION WHEN NO_DATA_FOUND THEN UTL_FILE.FCLOSE(FHANDLE);
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DAQmx: Gating Pulses with Pause Trigger

I have an NI 9401 module in a 9171 chassis and would like to gate the output of one counter with the output of another counter. Counter 1 (the signal to be gated) generates a 3 Mhz signal and Counter 0 (the gate) generates a 10 Hz signal that is externally routed to Counter 1's Gate pin. I expected this would gate Counter 1's signal to produce the 3 Mhz pulse only when Counter 0 is high, but the wiring had no affect on the output of Counter 1, it still generated a continuous 3 Mhz pulse train. I found that some code is needed to get a counter to pay attention to the signal at its Gate pin (this post was particularly helpful) and that this can be done with the Pause Trigger property node. After setting up the node, however, I ran into this error:
Error -20124 occured at DAQmx Start Task.vi:2
Lines 4 to 7 of this port are configured for input. Cannot configure these lines for output at this time.
I'm pretty perplexed by this. The problem seems to be coming from trying to designate PFI 5 ("CTR 1 Gate" on the 9401) as the Pause Trigger source. If anything, I would think the error would be that lines 4 to 7 are configured for output, since those lines are grouped under CTR 1 which is configured as a CO channel to generate the 3 Mhz pulse train, and that setting line 5 as the Pause Trigger source is changing the configuration to an input. Searching for this error in the NI forums and Google doesn't pull up any troubleshooting information. I've tried to create a task to configure line 5 as a seperate digital input channel, but then I get the opposite error (Error -200125) saying that lines 4 to 7 are configured for output and cannot be configured to input, to make things more confusing.
Any thoughts would be appreciated. I'm concerned that I'm missing something obvious about gating pulses or configuring CO channels since I keep reading that one of the advantages of DAQmx over DAQ Legacy is that it makes signal routing easier. I'm using LabVIEW 2012 (32-bit) with DAQmx 9.5.5 installed.
Solved!
Go to Solution.
Attachments:
Simple_Gated_Pulse.vi ‏29 KB

Hi agoncalves,
I took a quick look at your VI and I see two immediate problems:
1. There is not guarantee that both tasks will reserve before either one starts. This explains your error and why it seems confusing. The 9401 is nibble configurable but you can't change the direction while the device is in use (why the reserves are important). The module powers up with both nibbles set to input. Your first task drives an output so it switches direction on one of them. When your task is committed (started) it locks in that configuration. The second task then tries to also drive an output but on the other nibble which is input and cannot be switched because the first task is running. The solution is to use the error wire to force the execution order (or use a flat sequence structure).
2. You'll run into problems with your gating signal unless you wire it into a separate input (and put both pulse trains on the same nibble). You can change that by setting the channel property CO.Pulse.Term. That's if you want to route your signal through some external circuitry and back in. If you are using the signal directly, you could just use it internally. Such as /cDAQ1Mod1/ctr0InternalOutput

Read analog trigger signal gated by digital pause trigger

Hi!
I want to use and analog trigger together with digital pause trigger. At the same time i want to see on the scope the analog trigger signal which was gated by gate signal. Is it possible? Can i somehow wire the gated trigger to one of the outputs of the board?
Thanks in advance.

Hi Sergei_phys,
Thank you for the forum post!
I have a few questions about your post:
What hardware are you using? Is it NI or 3rd party? You mention using a scope, is that a NI piece of hardware/module?
In theory you can have a analog trigger to start the acquisition and a digital trigger to pause , but it depends of the hardware.
Thanks,
DanC12

Does "pause trigger" have a status flag?

Hi,
I am using a BNC2110 with PCI6133 multifunction DAQ card. I am reading random analog voltage pulses on one channel for now, and using the "Pause Trigger" properties (on trigger property node) so that the read task only takes in samples from the pulses, and not samples of the baseline noise between pulses. This works ok. But is there a way of signalling when the pause trigger has actually started and stopped (at the rising and falling edges of a pulse, respectively)? I want to use these signals to index the collected data so that I know where in the data any one pulse starts and ends, and so keep all pulse data separate, but in one array.
Many thanks,
Oliver.

Hi Oliver
One thing you could do it to look for a timeout error to flag when a pause occurs. The time-out error code is -200284. If you set the timeout value to the minimum (1) you can keep checking for the timeout and set a boolean to true when a timeout occurs. So if the boolean is true you know you have a pause, if the boolean is false you know you are reading in the signal.
I have adapted the vi that you posted to do this and attached it below.
I hope this helps
Thanks
Beejal S
NI UK & Ireland
Attachments:
ai_with_analog_pause_trigger_flag.vi ‏44 KB

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I have ready many forums regarding the inability to use Pause / Break button on Macbooks (or other small keyboards made by mac) without using a USB pad extension. And all of those threads are closed and will not let me reply with MY ANSWER / SOLUTION!! Lets just say my life depended on getting a Pause button working on Bootcamp Windows 7 x64 macbook. I googled away, with no answers... I did know about the fn option to perm in windows btw. BUT, i remembered, when i couldn't get my x64 bit drivers for Bluetooth keyboard to work, that there was a VIRTUAL KEYBOARD inside of "ease of access center" inside of Control Panel (all view). Find "use the computer without keyboard" and enable "use on screen keyboard" Now you will be able to click PAUSE virtually in keyboard... I dont know if this is an option in XP or vista, but Im sure its built in as well. YOUR WELCOME ;P

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Help: Can you use software trigger on a digital line.

Hi:
We have a legacy DAQCARDard 700 which does not support hardware triggering.
We have a trigger from our instrument that is 5 V+ and we would like to
trigger when it drops to 0 V. We have several questions.
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Thanks Doug,
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Pete
"Doug Norman" wrote in message
news:[email protected]..
> Hello Pete,
>
> You are correct that the DAQCard-700 has no digital (or analog)
> hardware trigger. The analog trigger example t
hat is working for you
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> want a digital low (below 0.8 volts) to show up as a digital high, and
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> 2. I don't know of a good example. You would basically have to
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> analog inputs. Then use this example to trigger when the 5 volts
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> 4. I don't understand this question.
>
> Best Regards,
>
> Doug Norman

Use reference trigger for cyclic recording data

Hi,
Before I start, let me briefly introduce what hardware I have and what I want to achieve.
I got SCXI-1000 (Chassis), SCXI-1102C (module), SCXI-1303 (terminal block,
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HW
Solved!
Go to Solution.
Attachments:
Arburg digital signals.png ‏17 KB
Trigger_Test2_TransientComparison.vi ‏109 KB

Hi, Jim:
I've tried with the way you suggested to poll out the digital line. In your VI, it will stop the running of the whole program when the second signal jumps up. If you see my VI attached, I'd like to start recording with the first trigger and then stop the cycle file by the second trigger signal falls down, and then keep recording the second cycle until clicking stop (reference to my signal illustration).
So what I am trying is to use both trigger signal to output a boolean value (when both trigger signals are 0), reverse it to true (1), and use it to stop the cycle file. But I am still little far away from doing the task. Is there any way to do the cyclic file as I want with or without 'Write to Measurement File' VI?
Please edit my VI and save in V8.5. Thanks for your help!
Best Regards
HW
Attachments:
Trigger_signal_illustration.png ‏12 KB
Read_AI_Test2-Dig_Chan_triggers.vi ‏111 KB

Retrieving latest updated or inserted records without using a trigger

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I am trying to write my own code in VC++ .Net(MFC) for FM/AM generation using DAQmx C functions, but it was more demanding than on the LabView platform. I can build the framework for all parameters (ie. Carrier Freq, Modulation Freq, Modulation Index, Amplitude) but as I came to the the array size, sampling rate, buffer size, I don't know what to do??
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RollyMessage Edited by Rolly on 04-06-2005 02:35 PM
Message Edited by Rolly on 04-06-2005 02:38 PM

AO Generation using Pause trigger

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