RVS4000 - how to achieve a maximum data rate

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• How do you compare the data collected continuously?

  So, I'm stuck on the basic architecture, therefore, hoping that you can push took me.

  What I have is a VI that measures the tensions permanently, then, I have a flow of power from DAQ hardware data points.  What I WANT is to act on the data points of tension, only, which are larger than the previous points.  For example, I want to act on the first data point, since it will be the most important, since there is nothing to compare to, then I want to compare the points of data subsequent to the first, until there is a greater than the first data point.  Then, I want to compare tensions the NEW value more and so on, etc. and act only on the NEW larger value.

  Consider this list of data points and corresponding outcomes:

  2 LAW

  4 LAW

  3. DO NOTHING

  3. DO NOTHING

  4-DO NOTHING

  5 LAW

  4-DO NOTHING

  5-DO NOTHING

  4-DO NOTHING

  3. DO NOTHING

  6 LAW

  I've been watch combinations of them for WHILE loops and shift registers and the tables, but the table would get so huge so fast and the MIN/MAX value of the TABLE palette function would get pretty slow and I don't need to evaluate all previous data.  I just need to be able to identify the highest value and then compare it to the following values until there is a NEW larger value.  It's a bit like how the warriors would fight several opponents until they lost and then, there's a new champion, and all subsequent warriors are compared to the new champion and so on and so forth.

  You have any suggestions on how to achieve this?  I'm puzzled.

  Thank you

  Dave

  Yes, either case will work, I put it in the structure case just to show that you need to put in there if you want to use.

• How to choose the maximum number of items for DMA FIFO to the R series FPGA

  Greetings!

  I'm working on a project with card PCIe-7842R-R series FPGA of NOR. I use to achieve the fast data transfer target-to-host DMA FIFO. And to minimize overhead costs, I would make the size of the FIFO as large as possible. According to the manual, 7842R a 1728 KB (216KO) integrated block of RAM, 108 000 I16 FIFOs items available in theory (1 728 000 / 16). However the FPGA had compilation error when I asked this amount of items. I checked the manual and searched online but could not find the reason. Can someone please explain? And in general, what is the maximum size of the FIFO given the size of the block of RAM?

  Thank you!

  Hey iron_curtain,

  You are right that the movement of large blocks of data can lead to a more efficient use of the bus, but it certainly isn't the most important factor here. Assuming of course that the FIFO on the FPGA is large enough to avoid overflowing, I expect the dominant factor to the size of reading on the host. In general, larger and reads as follows on the host drive to improve throughput, up to the speed of the bus. This is because as FIFO. Read is a relatively expensive operation software, so it is advantageous to fewer calls for the same amount of data.

  Note that your call to the FIFO. Read the largest host buffer should be. Depending on your application, you may be several times larger than the size of reading. You can set the size of the buffer with the FIFO. Configure the node.

  http://zone.NI.com/reference/en-XX/help/371599H-01/lvfpgaconcepts/fpga_dma_how_it_works/ explains the different buffers involved. It is important to note that the DMA engine moves data asynchronously read/write on the host nodes and FPGAs.

  Let me know if you have any questions about all of this.

  Sebastian

• The most effective way to log data and read simultaneously (DAQmx, PDM) high data rates

  Hello
   
  I want to acquire the data of several Modules cDAQ using several chassis to
  high data rates (100 k samples per second if possible). Let's say the measurement time is 10 minutes and we got a large number of channels (40 for example). The measured data is written to a PDM file. I guess, the memory or the HARD disk speed is the limits. For the user, there must be a possibility to view the selection of channels in a graph during the measurement.

  My question: what is the best and most effective way to save and read data at the same time?

  First of all, I use an architecture of producer-consumer and I don't want to write and display the data in the same loop. I expect two possibilities:

  [1] to use the 'DAQmx configure logging.vi' with the operation 'journal and read' to write the data to a PDM file. To display the data in a second loop, I would create a DVR samples documented and 'sent' the DVR for the second loop, where the data will be displayed in a graph (data value reference). This method has the disadvantage that the data of all channels is copied into memory. Correct me if I'm wrong.

  [2] use 'DAQmx configure logging.vi', but only with the "journal" operation to write the data to a PDM file. To view the selected data, I had read a number of samples of the TDMS file in the second loop (I'm currently writing the TDMS file). In this case, I have only one copy data from the selected channels (not), but there will be more HARD drive accesses necessary.

  What is the most effective and efficient solution in this case?

  Are there ways to connect and read data with high frequencies of sampling?

  Thank you for your help.

  You say that the measurement time is 10 minutes. If you have 40 channels and you enjoy all CHs at 100 kHz, it is quite a number of values.

  In this case, I always try to approach under the conditions of use. If a measure is only 10 minutes, I just connect all PDM data and create a graphic module that could be in the same loop of consumers where connect you the data. You can always work on the raw data files big offline afterwards, the extraction of all the information you need (have a look at the product called NI DIAdem: http://www.ni.com/diadem/)

  The main issue is that the user needs to see in the graph (or perhaps a chart can be useful too). Lets say that the graph is 1024 pixels wide. It makes no sense to show multiple data to 1024 points, Yes? Every second will produce you 100 data points k per channel. What is the useful information, which should see your username? It depends on the application. In similar cases, I usually use some kind of data reduction method: I use a moving average (Point by point Mean.VI for example) with a size of the interval of 100. This way you get 100 data points of 1000 per channel every second. If you feed your graph every second with these average values, it will be able to data points in 1024 of the store (as a default) by channel (curve), which is a little more than 10 minutes, so that the user will see the entire measurement.

  So it depends on the frequency at which you send data to the consumer. For example, collect you values 1024 by iteration of the producer and send it to the consumer. Here you can make a normal means calc or a bearing (according to your needs) and he draw a graphic. This way your chart will display only the values of the last 10 seconds...

  Once I programmed some kind of module where I use a chart and not a graph, and the user can specify the interval of the absolute timestamp that is traced. If the data size is larger than the size of the chart in pixels, the module performs an average calculation in order to reduce the number of data points. Of course, if you need to see the raw data, you can specify an interval that is small. It all depends on how you program zoom functions, etc... In my case I hade a rate of 1 Hz, so I just kept all data in RAM limiting the berries to keep 24 hours of data, so that technicians could monitor the system. In your case, given the enormous amount of data, only a file read/write approach can work, if you really need access to all of the RAW data on the fly. But I hope that the values of working capital means will be enough?

• Disabling the data rates inherited b

  Looking for advice on how to properly disable the low flow rates in our environment of 2.4 GHz.  We would like to disable all data rates b and support only 12 Mbps and more.  I understand I must set my rate of data WLC as well:

  1 Mbps through 11 Mbps - disabled

  12 Mbps - mandatory

  18 Mbit/s through 54 Mbps - supported

  Is this the right way to support customers g and effectively exclude customers b and all associated General fresh b?  I look forward to any comments!

  Thank you

  Anthony

  Yes, who's going to do well.

  HTH,
  Steve

  ------------------------------------------------------------------------------------------------
  Please don't forget to rate helpful messages and mark the questions answers

• How to set the current date in the datetimepicker in qml?

  Hello

  Can I know how to set the current date in the DateTimePicker in QML?

   DateTimePicker {
                      id: datePicker
                      mode: DateTimePickerMode.Date
                      title: "Date"
                      value: "2013-11-20"
                      maximum: "2013-11-20"
                  }
  

  Container {
      DateTimePicker {
          id: picker5
          title: "DateTimeQml"
          mode: DateTimePickerMode.DateTime
          value: { new Date(); }
      }
  }
  

• 802 11b data rates.

  Hmmmm, I have question what a quick Internet search has failed.

  We know 802. 11 b data rates are 1 Mbps, 2 Mbps, 5.5 Mbps and 11 Mbps. My question is, how can we get these numbers?

  The 802. 11 b frequency spectrum signal is sent via, is 22 Mhz wide. In other words, the 22 million oscillations per second.

  Lets take 1 MB/s first. It uses barker coding, with 11-bit sent (or chip) equal to the actual data bit 1. As a result, 22 million (oscillations) each result in a forest (a 1 or a 0). Of these 22 million bits, we know that a chip (11 bits) equals the actual data bit 1. As a result, 22 million/11 = 2 million or 2Mbps. If this shouldn't be 1 MB/s? The 2mbps is a unique swing is equivalent to two bits, doubling the 1mbps to 2 Mbps. Im trying to work on how these 802. 11 b rates are calculated. Math below is probably correlated to somehow how rates are calculated?

  22 000 000 (22 Mhz) / 22 = 1 MB/s

  22 000 000 (22 Mhz) / 11 = 2 Mbps

  22 000 000 (22 Mhz) / 4 = 5.5 Mbps

  22 000 000 (22 Mhz) / 2 = 11 Mbps

  Anyone?

  Dazzler

  Watching a trace of Spectrum Analyzer also lets you understand.

  If you look at a 802. 11B trace, you will see that it resembles a hill, a bump.

  Which means that the centre 11 Mhz are at max power. The other 11 Mhz border are not useful signal, but they are still unusable by others.

  22 Mhz is so the connection you "kill" when you will pass, but only the 11 mhz Center contain a useful signal.

  To remedy this, the 802.11 g brings OFDM and there are several substrings and material. This allows the signal look like "bart simpsons hair", which is very steep on the border, you use not all 20 Mhz then.

• Problem installing software of Bluetooth Enhanced Data Rate II (v6.2.1.3100)

  Hello

  Today, I have improved some Lenovo drivers, including the bios v1.20. When I was upgrading software Bluetooth Enhanced Data Rate II to the 6.2.1.3100, offered on the page version drivers for t400s, I got the following error, almost at the end (sorry, the OS is in Dutch): "there there was an error during the installation of the political party...» ». See below:

  

  After that he has automatically restored the update, however probably not completely, because now when I reboot with active BT I get the following error, also in Dutch: "the program can't start because btwhidcs, DLL is missing from your computer. "You may be able to solve this problem in re - install the program.

  

  My backup files, I've restored the previous version 5.2.1.2900 Setup file, but am also unable to re - install and make two mistakes now. I must have been able to install 5.2.1.2900 with the previous bios, because it was the version I checked before you run the 5.2.1.3100 update!

  How can I solve this (apart from doing a full system restore). I would not be able to install the new driver properly? If this is not the case, how can I restore BTtray.exe then.

  Thank you, Jan

  Looks like there's a problem install the Visual C++ 2005 redistributable. You can try to install these first manually by using the links below:

  x 86 version:

  http://www.Microsoft.com/downloads/en/details.aspx?FamilyId=200B2FD9-AE1A-4A14-984D-389C36F85647

  x 64 version:

  http://www.Microsoft.com/downloads/en/details.aspx?FamilyId=EB4EBE2D-33C0-4A47-9DD4-B9A6D7BD44DA

  Even if you are using Win 7 x 64 (assuming you are using Win7), according to me, you need the x 86 redistributable og version for this software. If you already have an earlier version of the redistributable installed, you might as well try to uninstall first and then reinstall Microsoft Download or try to install the BT software after uninstalling. So, you can try to uninstall the BT software and start again.

  If you already have version BT 6.2.1.1400 installed, you should ensure that you have a complete backup since this version had a serious bug when installing/uninstalling this version could wipe you HDD. I know that this is related to the 6.2.1.1400 only.

  -gan

• Server managed by IOM reached often into account maximum data sources

  Hi all
  
  
  We use IOM 11.1.1.3.0, Weblogic Version 10.3.3, database 11.2.0.1 for one of our customer of the Bank. Recently, we encountered a problem that my server managed IOM is overloaded, when we check the error I see data sources to achieve the maximum number allowed. We have increased the maximum number allowed for 500 and still we are facing the same question. We also discover dead-locks in the alerts log. Now, I don't understand why the consumption of data sources is too high.
  
  Please let us know your valuable contributions on areas where we can check this.
  
  Kind regards
  NAG.

  Nag,

  You don't need the developer to understand what the code is causing the problem. You can analyze these questions using JRockit Mission Control, check these:

  1 http://itnaf.org/2012/06/24/jrockit-flight-recorder-into-oim-environment/

  2 http://itnaf.org/2012/08/26/jrockit-flight-recorder-analysis-into-oam-11g-environment/

  I hope this helps.
  Leoncio Thiago.

• PGC DATA RATE CS5

  Hello

  I have a problem when you try to burn a dvd with still cs5, I get an error message before the burning process.

  PGC "sequence 1" has an error in 01:12:43:03.

  The data rate of this file is to high for DVD. You must replace the file to a lower data rate.

  This is my workflow

  Images is XDCAM EX 1440 x 1080/50i 25 fps pal widescreen.

  First, I use the setting of the direct export to Mpeg-2 dvd. parameters as in the image as an attachment. A time exported, I close again first, open, import the video and audio file and place it on the timeline, do chapters ect. Press build and before burning. ERROR.

  

  Your settings are set too high. Bring down the target to 7 Mbit/s with a maximum of 8 Mbps. This will bring the data rate until you can actually read a burned disc.

• How can I erase the data on my laptop before I give it away?

  How can I erase the data on my laptop before I give it away?

  See this document.

  https://support.Apple.com/en-us/HT201065

• My ipad is disabled. How to activate ipad without data loss? I know the password

  My ipad is disabled. How to activate ipad without data loss? I know the password

  You can not. If you know the password, how the iPad become disabled? If the device is disabled, the content is not already available. The only way to recover the device is to restore. You can restore your last backup after that. Follow the instructions in this document support. If you have forgotten the password for your iPad, iPhone or iPod touch, or your device is disabled - Apple supports

• How to get back my data for the health and the watch Apps once I've restored my phone?

  How to get back my data for the health and the watch Apps once I've restored my phone?

  From the backup, you're going to be restoration.

  If you back up to iTunes, make sure that it is an encrypted backup.

• Saved my iPad in full before selling. How and then retrieve the data (bookmarks, photos, etc.) from my computer?

  Hello

  I sold my iPad of the week. Before the restore to factory default, I made a backup (already backup place regularly to icloud anyway). I did manually a couple of times to make sure that the data has been saved.

  I have just connected on iCloud on my PC but it is empty. I can try to go in Mail, Notes etc but there is nothing there. Can someone tell me what I am doing wrong and how I can find the data backup?

  Thank you

  Your backup data are not visible on iCloud.com

  Where you want to restore data to? You did an archive of data which cannot be used on another device. It is not accessible in any other way.

• How do I know the date purchased in the macbook pro?

  How do I know the date purchased in the macbook pro?

  The date of the purchase of a MBP will on reception, not in the MBP.

  Ciao.