NI PXI 6229 DAQ Card Digital Output High/Low Levels

Hi everyone, I can't seem to find in the NI PXI 6229 DAQ spec what the Digital Output high voltage and low voltage is when I set a digital signal high and low. What is the voltage when I set a Digital Output "HIGH" and what is the voltage when I set a Digital Output "LOW"?
Thanks!

See the digital I/O characteristics section of the specs. Typical ttl levels.

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How to structure the DMA buffer for PXie 6341 DAQ card for analog output with different frequencies on each channel

I'm using the MHDDK for analog out/in with the PXIe 6341 DAQ card.
The examples, e.g. aoex5, show a single Timer (outTimerHelper::loadUI method), but the example shows DMA data loaded with the same vector size.
There is a comment in the outTimerHelper:rogramUpdateCount call which implies that different buffer sizes per channel can be used.
(the comment is: Switching between different buffer sizes will not be used)
Does anyone know what the format of the DMA buffer should be for data for multiple channels with different frequencies ?
For example, say we want a0 with a 1Khz Sine wave and a1 with a 1.5Khz sine wave. What does the DMA buffer look like ?
With the same frequency for each channel, the data is interleaved, e.g. (ao0#0, ao1#0; ao0#1, ao1#1, ...), but when the frequencies for each channel is different, what does the buffer look like ?

Hello Kenstern,
The data is always interleaved because each card only has a single timing engine for each subsystem.
For AO you must specify the number of samples that AO will output. You also specify the number of channels. Because there is only one timing engine for AO, each AO will channel will get updated at the same time tick of the update clock. The data will be arranged interleaved exactly as the example shows because each AO channel needs data to output at each tick of the update clock. The data itself can change based on the frequency you want to output.
kenstern wrote:
For example, say we want a0 with a 1Khz Sine wave and a1 with a 1.5Khz sine wave. What does the DMA buffer look like ?
With the same frequency for each channel, the data is interleaved, e.g. (ao0#0, ao1#0; ao0#1, ao1#1, ...), but when the frequencies for each channel is different, what does the buffer look like ?
In your example, you need to come up with an update rate that works for both waveforms (1 KHz and 1.5 KHz sine waves). To get a good representation of a sine wave, you need to update more than 10x as fast as your fastest frequency...I would recommend 100x if possible.
Update Frequency: 150 KHz
Channels: 2
Then you create buffers that include full cycles of each waveform you want to output based on the update frequency. These buffers must also be the same size.
Buffer 1: Contains data for the 1 KHz sine wave, 300 points, 2 sine wave cycles
Buffer 2: Contains data for the 1.5 KHz sine wave, 300 points, 3 sine wave cycles
You then interleave them as before. When the data is run through the ADC, they are outputting different sine waves even though the AO channels are updating at the same rate.

How to use PXI 6071E daq card to complete multichannels scan with high sampling speed

I used pxi 6071E daq card to acquire 115v 400hz AC signals.when I use mutichannel scan function,I find that the voltage of waveforms have much more error.The voltage error is about 0~15v.please you can tell me why this happened?how to solve it.
Attachments:
多通道监测4.vi ‏199 KB

Sunny;
As you are scanning multiple channels and the signal range is high, you can try to set the interchannel delay a little higher. The interchannel delay is the time which the multiplexer will take to switch to the next channel. If that time is to short, the instrumentation amplifier can have problems to settle, and then an error at the reading will happen.
You can change the Interchannel delay at the AI Config.vi.
Hope this helps.
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Hi!
I'm using a LABVIEW 6229 DAQ- Card to acquire signals. Unfortunately I only connected on of the Connectors of this card and left the other one unconnected (This means that one half of the analog inputs is connected to nothing). So far no problem :-) Unfortunately I'm still measuring signals on the analog input channles that are not wired to anything if I'm measuring signals on the analog input that are wired!?
The signals of this unwired analog inputs are quite similar to those of the connected ones..
If I only measure analog inputs that aren't wired to anything I see a voltage ramp or a constant voltage of -10V as I would expect. Any idea what could go wrong? All this seems a bit strange to me :-)
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But I also don't see ghosting at the unwired channels if i'm measuringsimultaneously
at the wired channels. Only if I'm measuring only unwired channels I see ghosting at that is what seems strange to me...
If I would always measure ghosting at the unwired channels everything would be fine :-)

Digital ı/o problem in mseries 6229 daq card

In our lab, we have a 6229 M series daq card. We want to send digital output ,
( three square waves and their direction values for driving 3 dc motors.
We will change pulses or frequencies during application). we tried to send the signals from single lines
(altogether we need 6 lines.) but we failed. We could only send pulses from counter ports but
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Hi,
You can use the correlated dio functionality of your M series board to output digital waveforms. However, you will need to construct the waveform before actually outputting the data. Here is the link to another discussion forum with more information on this including links to examples: How do I output a digital waveform?
Regards,
Hal L.

How does the PCI-6229 DAQ-card communicate with CB-68LP connector block?

Hello!
I want to do a very simple task which is to just turn on/off a LED. I am using LabVIEW 7.1 and I have a DAQ-card PCI-6229. The DAQ-card is then wired to a connector block CB-68LP.
Now my problem is to figure out how the connector block communicates with the DAQ-card?
In the file I attached there is a picture of connector block and the device pinouts from the DAQ-card. But how do I know which of pinouts triggers some connector on the connectorblock?
Which are digital outputs on the DAQ-card?
Where can I read about this?
Attachments:
daqANDconnectorblock.bmp ‏2437 KB

Hello asc01001:
The digital pins of the PCI-6229 are labelled as Px.y, where x is the port name while y is the channel name. For example, pin52 of the NI 6229 is P0.0; which is also port 0, channel 0 of the digital I/O of the DAQ card.
While "D GND", which are located at pin53, pin18, pin50, etc. are the negative terminal of all digital I/O of the DAQ cards.
Please advice if this helps.

How to generate a pulse waveform 90 deg phas shifted with respect to a pulse generated using a counter in PXI 6070E daq card ?

Hi
I ma using 6070E daq. I am generating a infinite pulse train using one of the counters. I want to generate another pulse train which should 90 degress phase shifted with respect to the previsously generated pulse. How to implement this using the counters in the DAQ card.

Hi Gopal,
1) yes the frequency generator is programmable. You have 2 timbebases (10MHz and 100kHz) and you can divide down by any integer between 1-16. Those are the only frequencies you can use.
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connect the output of that counter to the gate of your pulse train function. That way, during the delay period of the pulse, you won't be outputing your pulse train yet. When the pulse (high-time) of your pulse reaches the gate, then your pulse train will start generating its pulse train (which is consequently delayed by the amount of delay used in the single delayed pulse counter). Since you don't want your pulse to go back low, you will have to turn off or clear your pulse counter while it is high. That way the signal on the gate will remain high forever.
Your better solution is to use a PCI-660x card to perform this action. You will have more counters which will give you a greater range of frequencies to choose from and you will have more accurate timing of the signals.
Anyway, hope that clears things up. Have a good day.
Ron

Ni pxi 6221 daq card internal dc offset is appearing in every signal

sir ,
thank u for the quick response from ni , please reply for my first
question , i.e there is internal dc offest value of around 0.35 volts
appearing with every signal when i try to measure it with a pxi 6221
multi fuction daq card and ni elvis oscilloscope or oscilloscope
to observe it . even though the the dc offset is zero from the
source side (arbitray waveform genertor).
Deepak Kumar
M.Tech , Power and Energy Systems
NITK SURATHKAL
MANGALORE
INDIA

Hello,
What is your arbitrary waveform generator's product number? Have you tried calibrating the arb?
Regards,
Sean C.

DAQ Continous Digital Output Changing Buffer each 1 ms

I am developing an application using labview 8.5 and Real Time with ETS.
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I cannot figure out how programm this in LabView.
My last try is in the attached picture.
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DigitalContinuous2.JPG ‏198 KB

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http://www.fluigent.com/
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Hello,
We are using DAQ assistant to set the analog output parameters (frequency).
Is it possible to set different values for each channel using DAQ assistant?
If not using DAQ assistant, what is the other way to set it?
Thank You
Arunas

If you are trying to set different frequencies for waveform generation on two channels, the answer is No, it can't be done. If possible, you will have to pick a sample rate high enough to work for both signals, and use an over-sampled waveform.
Another choice would be to use a second device for the second waveform.
John Weeks
WaveMetrics, Inc.
Phone (503) 620-3001
Fax (503) 620-6754
www.wavemetrics.com

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(I am using version 6i of LabVIEW). I am trying to create a VI that will use a PXI 4351 Card with a TBX-68T to take 4 thermocouple continuous measurements. I am also acquiring 8 voltages with a 6030E and TBX-68 and writing them to a file. My voltage data acquisition is modeled after "Buffered Continuous Analog Input.vi" I would like to aquire voltages and temperatures in the same vi, but using different devices and accessories. (I need a higher frequency for the voltage acquisition, and more precision with the temperatures). Is there a subvi I can use to collect the temperature data in the same vi as my voltage? I don't want the thermocouple DAQ to interfere with the voltage DAQ, either.
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Any comments would be great. Thanks in advance.

Claudia-
Thanks for the response.
Regarding the CJC- When I switch it on, the temperature readings I get are very random, roughly negative 1 degrees. (I am operating right now at room temperature, and will be using J-type TC's to measure ~43 degrees C). Also, when I use the built-in CJC, the aquisition rate seems to slow down considerably. When I use the "user specified" everything seems to be ok, including the aquisition rate.
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sure.
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I would like to keep this file as is because it writes to a file exactly the way I want it to. I'd like to have the temperature aquisition with the 4351 in the same vi as the 6030E so that they both stop and start at the same time. I am just not sure how and where to log the temperature data since there will be fewer data points than the voltage data. Any suggestions? Should I write two separate files? can I somehow append them?
Thanks again. Hope to here from you soon.
Attachments:
EBlackMainDAQ.vi ‏107 KB
Save_Data8.vi ‏45 KB
Build_String_Array5.vi ‏33 KB

How do you configure the antialiasing filters on a PXI-6120 DAQ card?

I'm am using Measurement Studio 7.0 and C#. I am trying to use the AIParameter function in the CWDAQTools control.

I was originally trying to use the approach in the link, but am getting a type mismatch error. Here is my code. Maybe you can see what I'm doing wrong.
int device = 4;
CWAIParameterNames paramName = CWAIParameterNames.cwaiFilterSetting;
string channelString = "1";
CWDAQParameterOperations operation = CWDAQParameterOperations.cwdaqParameterSet;
double floatIn = 100000 //100 kHz for 6120;
CWAIParameterValues valueIn = CWAIParameterValues.cwaiVolts;
string stringIn = "";
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axCWDAQTo
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Pxi-6229

Hi,
I am using the PXI-6229 DAQ card Part Number 779115-01, for my project. Is it possible to
configure the IO lines as Open Drain/Collector or Push pull? If so, how and which are the
ports we can configure.
Thanks
Shiladitya

Hi Shiladitiya-
All M Series cards operate as 5V push-pull digital outputs and are not configurable for open drain/collector.
Hopefully this helps-
Message Edited by Tom W [DE] on 06-23-2006 09:49 AM
Tom W
National Instruments

NI DAQmx Digital Output Trigger To Start Analog Input Task

Hi everyone. I am using the NI DAQmx VIs to set a digital output line low (boolean '0'). I want to begin reading an Analog Input voltage (Start Analog Input Voltage reading task) right after the digital output line is set low. I am using the DAQmx Start Trigger (Digital Edge).vi to try and do this. I have the digital edge to trigger off a falling edge since the digital output line is being set low. I am using "do/SampleClock" as the source into the DAQmx Start Trigger (Digital Edge).vi.
I don't have the DAQ card (PXI 6229) since someone else is using it but I wanted to write up the SW so that when it becomes available I can have SW to try out.
I have attached the VI. Am I setting up this VI correctly?
Thanks!
Attachments:
Trigger AI Task Off DO Edge.vi ‏32 KB

I think you are going to have to wire that Digital Output to a PFI line on the card with the Analog Input(s). You then trigger on that PFI line.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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How can I send digital Output at faster rate than 1ms period?

Hi!
I'm using a PCI-6229 to send digital outputs to a power source and I need to send n different numbers in binary code. I need this to be periodic so I've used a while structure and the diferent numbers as the different components of an array. In this way the while loop writes the "task" repetedly at the period I have set to the loop using "wait until next ms multiple". So, it does what I want. The problem is that I need the loop to work at a higher rate than ms. It would be great if I could make it go at 0.01 ms. I have tried and even when the "wait until next ms multiple" doesn't like doubles it tries to work at this rate but the signal is not 100% periodic and I need it to be much more precise.
Does anyone have an idea to solve my problem?
Thanks a lot,
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I think the example you want to look at is Digital - Continuous Output.vi. You can just use the onboard clock and set the sample rate to whatever you need (100kHz it looks like).
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NI PXI 6229 DAQ Card Digital Output High/Low Levels

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