Analog and Encoder being collected only on encoder pulses.
I currently have the setup below and the XValue timestamps from the Write to Measurement File are not exactly at the rate I specified in the DAQ Assistant. The DAQ Assistant just has analog channels with Samples to Read set as 10 (or 1, which does not affect this example) and the Sample Rate (Hz) set to 10 Hz. The main problem that I am having is that the analog channels seem to follow the Frequency Counter in the sense that it alters the XValue timestamps in the Write to Measurement File and will only log the analogs and frequency channel when the encoder (frequency counter) encounters the edge of a pulse. How do I get the analog channels in the DAQ Assistant to log as well as getting the Frequency Counter to log simultaneously with the correct XValue timestamps from the Write to Measurement File with or without the encoder moving?
Also, is the 100 ms Wait Until Next ms Multiple needed for the Frequency Counter?
Thanks in advance for the help.
The *.vi works correctly except for the fact that when the encoder is not reading any pulses, not moving, it delays all data acquisition for all channels (analog and counter) until the encoder rotates again or the counter channel for the encoder times out according to the timeout specified. I would like for all of the channels to be able to continue logging at the specified rate in the DAQ Assistant for the analog channels and the specified rate for the counter channel (encoder) if the encoder is not reading any pulses. Also, when the counter channel is reading pulses, the timestamp XValue of the Write to Measurement File is not at the exact rate I specify in the DAQ Assistant. An example of some data is shown below.
X_Value
Analog
Encoder
0
2.231008
0
9.237507
0.942442
0
20.366281
3.523876
5.227699
20.725778
-4.150966
1.09365
22.304438
6.117589
70.197237
When the encoder is not receiving counts, it halts all data to be written to the Write to Measurement File and the X_Value timestamps are not exactly at 10Hz as I requested in the DAQ Assistant.
Thanks again for any help.
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Correlated analog and encoder readings with M-series
Hardware: PCI-6220
Driver: NI-DAQmx
Software: VC++ 6.0
My goal is to collect synchronized (correlated) analog and encoder readings to provide position-based voltage and current information.
First question is regarding the potential alternatives and which is the best approach between these options:
1) A single task that reads required analog and counter information into the same buffer, seems easy to align the data using this approach.
2) A task to read analog data and a second task to read counter information, complicated by the need to reliably align the informatio from seperate buffers.
Next question is simple: can the PCI-6220 read 2 seperate encoders?
Hopefully, last question: where can I find documentation about where to connect A, B, and Z? So far all my searches have resulted in E series or 6602 counter examples and nothing on M series.
Thanks, EdHi Ed,
To answer your questions:
>>First question is regarding the potential alternatives and which is the best approach between these options:
>>1) A single task that reads required analog and counter information into the same buffer, seems easy to >>align the data using this approach.
>>2) A task to read analog data and a second task to read counter information, complicated by the need to >>reliably align the informatio from seperate buffers
First of all, option one is not actually an option because you cannot have one task acquire two different types of data (eg analog and counter data). Therefore, option two is the way to go. It is not as hard as it seems. You can use Channel Z to trigger the analag input channels and once the analog and counter channels are triggered at the same time their data will automatically be aligned.
>>Next question is simple: can the PCI-6220 read 2 seperate encoders?
The PCI 6220 has two 32 bit counter channels, so it is possible to read two separate encouders. Here is a link to the product data sheet for this card: http://sine.ni.com/apps/we/nioc.vp?cid=14130⟨=US
>>Hopefully, last question: where can I find documentation about where to connect A, B, and Z? So far all my searches have resulted in E series or 6602 counter examples and nothing on M series.
You are right, it is difficult to find out where to connect channels A, B, and Z! The easiest to find this information is to create an NI-DAQmx counter Task in MAX (Measurement and Automation Explorer). Once you have followed all of the steps to create the task you will see the task information in the middle of the screen. There will be a settings tab and inside this tab it will tell you what pins to connect A, B and Z to. I went ahead and created tasks for ctr 0 and 1 in MAX to get the information on which pins to connect to A, B, and Z.
For ctr0: For ctr1:
A: PFI8 PFI3
B: PFI10 PFI11
Z: PFI9 PFI4
Please let me know if you have any further questions. Have a great day!
Jennifer -
Encode to audio only with a purchased iTunes movie?
I'm trying to encode to audio only using finder, with a purchased movie from iTunes. When I do this it says complete with an error, and nothing is exported or encoded or anything???
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You could resort to analog methods. -
Hello World,
after 10 years of LabVIEW experience I'm totally lost.
This is my first project with DAQmx and I don't know how to handle it.
My setup: Windows7; LabVIEW 2012 DevSuite; X-Series USB-6366
My goal: Trigger the encoder value and 2 Analog Inputs
I would like to get one result for the encoder value and each of the two analog inputs for each change of the encoder value (not more!!! I don't want to sort a huge amount of data afterwards)
I've been able to configure it with the Measurement and Automation Explorer, but have no clue how to get this in a LabVIEW configuration.
All examples I could find are reading the analog Inputs and the Encoder with SampleClock. That's not what I'm looking for.
I would greatly appreciate if someone could guide me to my solution.
I've attached the exported confiuration of the Measurement and Automation Explorer.
Thanks in advance, best regards,
Balze
P.S.: Sorry I had to ZIP the *.nce file, because NI doesn't allow to attach *.nce files
Solved!
Go to Solution.
Attachments:
configData.zip 290 KBHi RupiDo, hi Kevin P.
thank you for your effort and your willingness to help me. I aprreciate it!
@ RupiDo:
I'm aware of the DAQmx Timing.vi but where do I find I/O filtering (which context menue?)
DAQmx is a Monster for me. It's for sure felxible and powerfull but how to configure it is not obvious for me. Also the dependencies are unclear to me. I tried things and get an error at run-time that this or that is not supported, reserved, ....
Nyquist Shannon doesn't matter very much for my task. I measure DC voltages with litlle changes. But thank you for pointing this out.
Retriggerable property node?? Where's that? (This maybe not obvious for me, because it's a german LabVIEW I've got to work with)
@ Kevin P.:
Yes, it's a quad-encoder with A,B and Z but Z is still unused (and will be unused for now)
I've got similar problems to setup your solutions.
When I try to configure "Change Detection" I get error messages, that it's not supported. "allow buffer overwrites"??? I seached for it very thoroughly,but without success.
I looked at a lot of examples but always found solutions with buffered aquisition. I'm already willing to use buffered aquisition, but I even can't setup this.
I FEEL SO STUPID Over 10 years LabVIEW experience and the first DAQmx project let's me stumble.
I tried a buffered aquisition based on an NI example. But it only works for one analog input channel. The other brings up en error (-50103). Which one of the two analog channels brings the error is randomly.
Maybe someone could explain me, what leads to this error, that I could start understanding DAQmx.
I've attached the VI (LV2012) and screenshots of the frontpanel and the blockdiagram.
Thanks in advance, best regards
Balze
Attachments:
Meas Angular Position-Buffered-Cont-CtrClk-1.vi 72 KB
vi_panel.png 95 KB
vi_block.png 87 KB -
In your privacy policy, you state that the percentages and durations of books read are being collected to ensure that publishers can choose a metered price model. Prices which depends on the duration for which the book was read.
Give me an example of a company with such a price model? Are the information being collected even where the companies have not asked for the information, even when the metered price models are not being used?
Here is an extract från the privacy policy:
What information does Adobe Digital Editions collect and how is it used?
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User GUID: The User GUID is a unique value assigned in place of your User ID and is used to authenticate you.
Device GUID: The Device GUID is a unique value generated to identify your device. It is used to ensure that the eBook may be viewed on your device and that the number of devices permitted by the license is not exceeded.
Certified App ID: This ID represents the application that is being used to view the eBook, in this case Adobe Digital Editions. It is necessary to ensure that only a certified application may display an eBook. This helps to minimize piracy and theft of eBooks.
Device IP (Internet Protocol): This identifies the country you are located in when you purchase an eBook. It is used by eBook providers for the enablement of localized pricing models. Only the country identifier of the Device IP is stored.
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Information provided by eBook providers relating to the eBook you have purchased: The following information is provided by the eBook provider to enable the delivery of the eBook to your device:Date of eBook purchase/download
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Give me an example of a company with such a price model? Are the information being collected even where the companies have not asked for the information, even when the metered price models are not being used?
Here is an extract från the privacy policy:
What information does Adobe Digital Editions collect and how is it used?
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User GUID: The User GUID is a unique value assigned in place of your User ID and is used to authenticate you.
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Device IP (Internet Protocol): This identifies the country you are located in when you purchase an eBook. It is used by eBook providers for the enablement of localized pricing models. Only the country identifier of the Device IP is stored.
Duration for Which the Book was Read: This information may be collected to facilitate limited or metered pricing models entered into between eBook providers, such as publishers and distributors. These models are based on how long a reader has read an eBook. For example, you may borrow an eBook for a period of 30 days. While some publishers and distributors may charge libraries and resellers for 30 days from the date of the download, others may follow a metered pricing model and charge them for the actual time you read the eBook.
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hi all,
i would like to know
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i think i have to use like below
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but i dont have any idea what is charencoding for Western European(ISO) and arabic windows.
Am i in the right direction.
waiting for a valid solution.those are the methods, but you can't use getCharacterEncoding(), actually, cuz it seems it's not necessarily filled in.. or at least that might be on some servers only, like Tomcat 4. As for encodings, you need to do a search for character encoding names and use the appropriate one.
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I want to buy a new apple tv but it used hdmi cables and my house is only wired for analog. Is there any way I can use the apple tv on analog cables?
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It's do-able, but I don't think it's a great idea.
DVI
Some users with DVI have managed to get their TV's to work with DVI-HDMI cables. DVI carries no audio, so alternative connections need to be explored to enable audio. DVI doesn't necessarily support HDCP as well as other standards used by HDMI (which may or may not be an issue)
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I already tried the driver solution, and it didn't work... However, I can try even older driver and see if they will enable the cards DVI signal. The problem with the driver solution is that there is no setting for choosing CRT or LCD monitor. In both dual view and clone mode I can only choose between a monitor and TV output... One thing I found strange though, normally at boot time (before the OS loads) I would get both analog and digital signals, but now there is only the analog signal.
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I will keep trying and let you guys know how it worked out.
In the meantime, if anyone else has a suggestion, I'm all ears. -
Trying 2 download new version of Firefox and after being prompted 2 drag Firefox icon into Applications folder, get message that task can't b completed bc Firefox is in use, but only use am making of Firefox is 2 have it open 2 download new version
If there are problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
Download a new copy of the Firefox program and save the disk image (dmg) file to the desktop
* Firefox 7.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Trash the current Firefox application to do a clean (re-)install
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Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data if you uninstall and (re)install Firefox.
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Revision: 7661
Author: [email protected]
Date: 2009-06-08 17:50:12 -0700 (Mon, 08 Jun 2009)
Log Message:
Change from charset=iso-8859-1" to charset=utf-8" and save file with utf-8 encoding.
QA Notes:
Doc Notes:
Bugs: SDK-21636
Reviewers: Corey
Ticket Links:
http://bugs.adobe.com/jira/browse/iso-8859
http://bugs.adobe.com/jira/browse/utf-8
http://bugs.adobe.com/jira/browse/utf-8
http://bugs.adobe.com/jira/browse/SDK-21636
Modified Paths:
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Shut down the computer.
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Do you have an older version of iGlasses installed ?
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