PCI 6110 Digital I/O, How to and How fast?
The max the board can run is 5MS/s. There are Digital and Analog I/Os. I want to run Analog and Digital I/O with different speeds, analog @ 1.25MS/s and Digital at ? (don't know how fast it can go). I think I can achieve it by using PFI pins, but I am not sure. Could those be used as timing signals for Digital I/O?
And again, what is maximum Digital I/O speed that can be achieved on the board, which simultaneously samples analog inputs too. Any buffer problem (On-Board (8192 Samples!)) or RAM problem?
Attempt to solve any of these Questions are appreciated.
dhruvish,
Please see the posts at the following thread:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000F8DF0000&UCATEGORY_0=_30_%24_12_&UCATEGORY_S=0
Ames
Applications Engineering
National Instruments
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There is no one here from Apple.
In order for you to develop and distribute content for the iPad, you need to become an apps developer.
Not sure where you sign up for this or who you have to call.
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How to increase speed of analog read using PCI 6110 and LabView 7.1?
Hi All,
I'm a fairly novice user of LabView and I'm trying to figure out how to make my system as fast as possible. Basically, I'm reading in an analog signal (AI0) together with a trigger signal (PFI0) and I want to sample the analog signal on the falling edge of the trigger signal. What I'm finding, though, is that the acquisition rate of this system is excessively slow. My analog signals occur faster than 1 kHz, but the speed of my system is only about 100 Hz. A colleague of mine told me that the DAQmx Trigger.vi I was using was probably the culprit for the slow performance I was observing. Could this be right? If so, how could I resolve this issue?
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Thank you so much for your post! I tried doing as you suggested, using the Cont Acq&Graph Voltage-Ext Clk-Dig Start.vi and I first set the trigger signal as the external clock source. It works beautifully! Now, with 1.6 kHz signal in, I'm reading in 1.6 kSa/s. This is a dramatic improvement from before. I also tried using the internal clock source option, but it didn't seem to trigger when I wanted it to. I didn't spend too much time debugging it, though, since the other method works so well. This brings up an interesting question. Is the DAQmx Trigger.vi really that slow? Previously, I could read in 100 kSa/s at best using the Trigger VI. Anyways, I'm a happy camper now:-)
By the way, to answer your question about the DAQ device, I'm using the NI PCI 6110 Multifunction DAQ.
Thanks again!
Ben -
How can I optimally stream data to disk at 5 MS/s on 4 channels using a PCI-6110?
I am using a PCI-6110 to acquire data streaming from a camera. Data arrives on all four analog input channels at 5 MHz. An A2D clock is attached to PFI8, also originating from the camera and operating at 5 MHz. Finally, there is a Valid-data signal from the camera that signals when the data stream coming in on the four analog channels is actual data (each Validate pulse is about 132 samples wide). This is attached to PFI0. Ideally, I would like to have a program that captures data at the full rate and is correctly synchronized with the Valid-data line. It should also be able to stream to disk for several seconds at least before pausing for the buffer.
Though I'm something of an inexper
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Duke UniversityI'm not sure if I fully understand your application, but maybe some of these hints will help.
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Last, you might consider using your signal on PFI0 as a pause trigger. Depending on the frequency of the pulses on your Valid-data signal, this could significantly reduce the required bandwidth of both the PCI bus and your hard drive. However, since the 6110 uses pipelined ADCs, you need to be careful if the time between valid data pulses is greater than one millisecond. This would violate the minimum sampling frequency of the board and the points in the pipeline that are returned after unpausing (3 in this case) might not be digitized at the full accuracy specification for the device. Because of the pipelining, you also need to be careful how you correlate the data. The first time you unpause for the Valid-data pulse, the first three points will be garbage points. The second and subsequent times you unpause, the first three points are really the last three points from the previous Valid-dat
a pulse. See the Device Considerations->Timing chapter in the NI-DAQmx Help file for more information on timing considerations with pipelined ADCs.
I hope this information helps. Good luck! -
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 thanksif 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 -
Interface with I2C SDA and SCL with PCI 6224 digital ouputs in C/C++
I am trying to use the pci 6224 in order to send SDA and SCL to an I2C. I have been able to control the Digital Output, but I have been unsuccessful with generating a clock source to satify the I2C. I am writing this code in C/C++. Any ideas or examples would surely be appreciated. I need a good starting point, but I have not been able to find any useful examples that have worked. I am using the SCB-68 and I am trying to use my digital multi-meter to verify my code.
I have looked at the examples provided, but is there a description of these functions that are being called using the NIDAQmx.h?Hello VJohnson,
The counter will give you control of the clock frequency and duty cycle. However, this card also has correlated DIO, which means that you can clock your digital lines. Because of this, you can write a specific pattern (101010) to the buffer and just have it continuously output. However, you will have to write this in a way that you know what values you're writing based on the part of the clock you're at.
My I2C implemetation knowledge isn't the greatest, so I do not know how big each of your communication packets will be, but one implemetation would be to write your data in packets to regulate your SDA and SCL lines. The WriteDigChan-ExtClk is the best option that shows how to write a digital channel with a clock. You will just need to modify the DAQmxCfgSampClkTiming( function call. The second input should be changed from "/Dev1/PFI0" to OnboardClock or NULL. Hope this helps!
ColeR
Field Engineer -
help. I have a Google Hangout in 40mins and my sound seems to have vanished. I went to Sys Prefs and it came up with Digital Out....and the Internal Speakers option is no longer there. How do I reboot, or fix this please?
There are many possible causes for this issue. Take each of the following steps that you haven't already tried. Some may not apply to your model. Back up all data before making any changes.
1. Start with the steps recommended in this support article. Don't skip any of the steps. It's the starting point for further efforts to solve the problem.
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5. If an AirPlay device is selected for sound output from iTunes (or from other applications via third-party software such as "Airfoil"), deselect it.
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/Library/Preferences/Audio
Right-click or control-click the highlighted line and select
Services ▹ Reveal in Finder (or just Reveal)
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Go ▹ Go to Folder...
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14. Reinstall OS X after backing up all data.
15. Make a "Genius" appointment at an Apple Store.
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