Similar Questions

• Problem reading the PXI-2503 channels above 23 in mode 1 wire 48 x 1 Mux on Linux

  I can't get the above relay stations 23 in mode 1 wire 48 x 1

  % nilsdev | grep 2503
  OR PXI-2503: "Dev1".

  The topology is set on "2503/1-Wire 48 x 1 Mux ' via the following API, using the 'Dev1 '.

  DAQmxSwitchSetTopologyAndReset (device, topology)

  In theory this means there are 48 relay individual that can be read, however, fails the following:

  SwitchName = "/ Dev1/ch47.

  DAQmxSwitchGetSingleRelayPos (switchName, & pos)

  The error returned is:

  DAQmx error: relay name is not valid.
  Relay name: ch47

  State code:-200202

  who is

  #define DAQmxErrorInvalidRelayName (-200202)

  I can't get the relay station for foregoing relay 23 (/ Dev1/ch23)

  Which is the expected behavior, or is there a hardware or driver problem?

  When you use this switch in "1-wire" mode, we break essentially each (+) / (-) pair in their own channels.  Since this topology uses switches bipolar, only throw which individual terminals cannot be activated independently, another switch is introduced in order to decide which side of the switch is consulted at this very moment, (+) or (-).

  Instead of having 48 simple jet unipolar or bipolar, we have 24 bipolar single jet and two-way to decide what polarity we are referencing a single pole.  You can still use this topology in mode 1 wire 48 x 1.

  To switch manually using relay DAQmx controls, you need to specify the channel switch and polarity as Maggie mentioned.  When you call ' DAQmxSwitchConnect/Dev1/ch47/Dev1/com0', the driver knows that he has to close the relay 24 ch in more 'HLSELECT' AND "1WIRE" route only positive (effectively ch.47).

  The document NOR switches help contains a more detailed explanation of the topology if you access devices > NI PXI-2501/2503 >

  1 wire 48 × 1 Multiplexer topology.

• How to read the resolution, video P.C. of the Analyzer of spectrum using labview?

  Hi all

  I use the Analyzer of spectrum R & S and its pilots as ResSpecAn, I want to read the BW, BW video resolution and scan time. So how can get these values.

  Thank you very much...

  Patricia

  
  

• usefulness of reading the measurement file express vi

  Hello

  I found reading file express vi measure in LV7.1 does not read from the beginning of the file when you run it the second time. Instead, it resume from where it left off last time. Usually, the user would read the entire file measure each time. So when you try to read the second time, it will show an error window saying that it has reached the end of the file (because he was reading the entire file first).

  I wonder how useful to resume from the last stopping point is? Is there a way to start over each time that the VI excute it?

  I'm sure that's how reading file measure works 90%. Whenever she is called in a single run of the application, it will start off the coast where it was stopped. You will need to work with the low level screw to get what you want to do.

  This Express VI works in a similar way the screws and the following functions:
  Open/create/replace file
  Read text file
  Read binary file
  Read the spreadsheet file
  File dialog box
  Scan to file

  And, you can always use the node to set the file Position to set the position at the beginning of the file.

• I can measure the speed of the NI 9401 fan & cRIO 9075 under Scan Interface?

  Hello

  I am currently using OR 9401 & cRIO 9075 to develop a project, which is to control the CPU fans.

  Since I have to communicate with other instruments by serial port, while I have a NI 9870 module to implement the instrument control.

  I finished the part of control instrument under scan mode and would like to add the function of the fan speed reading.

  Now, I wonder if there is a problem when I choose the Scan Interface to deverlop the program.

  I found the following tutorial, he uses the FPGA interface to impement the acquisition of control and PWM frequency.

  http://www.NI.com/white-paper/3230/en/

  So if the function of the fan control only developed under an FPGA interface, I have to rewrite the control instrument part, seems to be a bit complicated...

  You can use the hybrid mode.

  http://digital.NI.com/public.nsf/allkb/0DB7FEF37C26AF85862575C400531690

• How to read the laptop temperature

  Hi all
  I searched TOSHIBA software Assits for a temperature gauge where I can read the temperature inside the computer, but have not been able to find anything.

  Did I miss something? Or do I have to install a third party software for that? And if so, does anyone know any good?

  Hello

  To my knowledge, you will not find any tools of temperature control material on Toshiba laptops. As far as I know that this tool is not preinstalled.
  So, if you want to use such tool, so you can use any 3rd party application.
  But I m not 100% sure what tools effective and what not.

  I used the wonderful ;) advanced search option of this forum and found this topic:
  http://forums.computers.Toshiba-Europe.com/forums/thread.jspa?threadID=14284

  It seems that the tool Hmonitor can properly read the temperature of the CPU.
  Maybe you could test it.

• How to read the status of User1 DIP-switch with a cRIO FPGA chassis?

  How to read the State of the DIP switches on a FPGA cRio chassis?

  I work with a cRIO 9022... My idea is to put the system in "service" mode with USER1 switch to IT and communicate with the FPGA via the FPGA - GUI (VI) on the host computer instead via the RT module that is used in normal conditions.

  Any ideas? Unfortunately, I don't have an unused channel on the left... .and (as I know) cannot use the interface RS232 of FPGA.

  Many thanks in advance,

  Luke

  Hi, this is the correct information. You cannot read the FPGA of DIP-switch status. The only thing you could do is to use the function of Reading Switch.vi located under the range of functions-> real-> utilities RT time

  It's how you probably know side host RT and not the FPGA.

  Cordially Virginia

• What digital IO to use to read the temperatures of a pt100?

  Hi all

  If this isn't a question about programming, but on the material and I need advice!

  For my experience, I have a usb-6008. The problem is I pt100 3 that I need to read and of course the usb-6008 work very badly because he does not read the resistance, but the tension and so I find myself with ridiculous in my readings of temperature fluctuations, making it completely useless.

  So here's my question, what guys would you use? Honestly, the usb-6008 case is average enough for my needs and work well with everything else I don't except this. I also doubt that my boss would be willing for me to buy a labview $ 1500 digital I/o, so I kinda need a less costly solution. Or maybe there's a way to twist the casing usb-6008 to make do what I want?

  Any suggestions would be very welcome!

  Thank you very much!

  For equipment, you can use NI 9217 and carrier cDAQ 9171:

  4 ch Module RTD 100 ω for USB

  You can also use DC pt100 or, possibly, 4 - 20mA pt100 my , these modules can then be fed to your USB9008. I have not used this particular means, but if you do a search on the web, you will find a lot of similar products.

• Reading the words of temperature controller fits using Modbus

  I'm working on a project that involves the use of a certain number of temperature controllers, Omega CN 7823 s.  The Protocol of communication for them is RS485 Modbus ASCII or RTU.

  I had a bit of trouble getting a job of communicating.  I think I do everything correctly in terms of setting up the initial communication parameters (baud rate, parity, etc.), but have been unable to properly read the values.  I am able to write values to operating records, but cannot read them.  When I try to read (using the code 03), the result is simply a multiple of 256 (if I try to read registry 1001 H, which is 4097 in decimal form, I get a result of 256).

  I'm running in ASCII at a speed of 9600, 7-bit data length, parity and 1 stop bit.

  Any help would be appreciated - I am attaching my VI and the manual of the controller.

  In the end it turned out that I had to create a property node to the VISA Instrument and specify the mode series RS-485/2-Auto.  This allowed the computer read the response from the controllers of temperature instead of simply reading the message that was sent to them.  I wish I had discovered this day 1, 2 or 3 to work on this problem, instead of the day 5.

• Precision in the reading of temperature PT100 and Module of NI9219

  Hello

  I m the temperature reading with a PT100, connected to the NI9219 Module. I put LabVIEW on mode 4 son RTD (PT100 range). I m able to read the weather temperature but I m do not know the right precision s or not. The temperature is between 25.5 and 25.8 ° C. Is this possible? I am able to do something to have more precision?

  Thank you in advance,

  Claudia

  Hi Claudia,.

  The specifications for the 9217 provide the absolute measurement accuracy Pt 100 RTD (3 and 4 sons) on page 14, it is not necessary to calculate [1].

  Since the 9219 is more flexible in the types of measures that it can bring, absolute accuracy for each use case is not provided. Instead, OR gives error of gain values and offset to be used for the calculation of the absolute accuracy [2].

  Follow this logic to calculate the absolute accuracy:

  (Absolute accuracy) = (entry reading) * (Gain error + drift in temperature) + (Offset + drift in temperature error)

  Reading the line "RTD 4-wire or 3 wire Pt 100" in the table on page 24, the error of gain and offset for a module between 20 and 30 degrees Celsius is ±0, 1% of reading entry for gain and offset sectors ±2400ppm. Drift in temperature comes into play when the module is outside the normal operating temperature, but for Pt 100, gain drift is ±15ppm and the offset of the drift is the ±60ppm (see page 25).

  So, for a module at room temperature 23 degrees Celsius and a Pt100 to 100 degrees Celsius using the 505 Ohm input range, the calculation is:

  At 100 ° C, the RTD would measure 138.5 Ohms if its temperature coefficient 0,00385 Ohm/Ohm / ° C, then

  Absolute accuracy = (138.5 ohms * 0,1%) + (2400 ppm * 505 Ohm)
  = 1.212 Ohm + 0,1385 ohm
  = 1.3505 ohms

  fracture of 0,385 Ohm / ° C, and

  Absolute accuracy = ±3, 5 degrees Celsius

  [1] NI 9217 Operating Instructions and Specifications
  http://www.NI.com/PDF/manuals/374187c.PDF

  [2] NI 9219 specifications
  http://www.NI.com/PDF/manuals/374473b.PDF

  I hope that I can help you with this information.

  Best regards

  SUSE

• What is the difference between General LV and LV RT considering that I want to read the output of a sensor of temperature online?

  Hello world

  I am very new in LV and I need to read my temperature sensore outputs online so that necessary system changes each time the temperature changes. If I use genral LV or LV RT?

  Thank you

  Hi elahetal.  The LV vs LV RT decision really depends on what are your needs of the moment.

  RT is not necessarily to be as fast as possible, but rather as consistent as possible.

  If you have a measure which must be taken every 100mS + / 2 ms to practically use RT a generalist OS like Windows will be randomly off the coast and do other things (read a cd, the printer, the disc index, etc.), causing your position to be late.

  A RT environment will allow you to determine precisely at the time where the system should do what.  The compromise is that the RT environment is somewhat limited, because you do not have all the bells and whistles, practitioner OS.

  If your action must be taken every 15 years + / 10 s then you can very well get away with standard LV on a PC.

  In some cases, a combination works well.  For example, RT on FieldPoint or CRIO to manage the time of sensitive issues and LV on a PC to manage the analysis of data and user interface.

  Hope that helps, please specify your needs if you wish.

  Matt

• NB550D: speakers do not seem to be attached to the chassis

  I just got one of these today and I am impressed overall so far, with the exception of a single thig. Stakeholders do not seem to be anchored on the chassis. If I press the palmrest on each side, they collide (machine completely off). Or even strong typing are the speakers rattle away. A gentle shake of the case, open or closed will cause a rattle. Is this normal? Everything I read praised the quality of the construction of this machine, but it seems just cheap feeling. Any other observations of the owners would be appreciated. IM posting here because the thread must therefore, with speaker problems.

  Thank you very much!

  Hey Buddy,

  To me that sounds like a HARD drive problem too, it seems that the HARD drive makes mechanical noises.

  But even that would be the speakers that you need professional help from an authorized service provider to swap parts. Guys can make an accurate diagnosis and to exchange the part. This is covered by the warranty, so it will cost you nothing.

  List of all FSA you can find here:
  http://EU.computers.Toshiba-Europe.com > support & downloads > find an authorized service provider

• How to connect the chassis cDAQ for strain gage

  Hi, when I read the guide of the extensometer of wiring on a chassis cDAQ (http://www.ni.com/white-paper/7130/en) I found confusing fig 10 .

  What are the things between the chassis and the extensometer?

  The three wires go only one channel of the cDAQ chassis? (in Fig 10, on channel 0?)

  Why there are four terminals (CH + EX + QTR EX-) on the strain gauge, but there are only two wires coming out of my extensometer? What should I do?

  PS. I have a USB-4431 cDAQ and a Vishay extensometer (http://www.vishaypg.com/docs/11297/250lw.pdf)

  Thank you very much!

  Elly

  ZSH2010,

  The 9219 will work.   You will need to use a measure of Bridge 2 son resistance measure quarter vs.  For more information about how to use the 9219 for 2wire resistance measurements, take a look at the 11 and 15 of the document specifications page

  http://www.NI.com/PDF/manuals/372407a.PDF

  It will be slightly less accurate than the quarter for the 9237 bridge accessory, but still needs to do the job.

  Kind regards

• How to read the voltage difference between the 2 pins of a RS232?

  Hi, I'm new in this field and I'm having a problem in the acquisition of data from a RS232 port. In fact, I don't know if it is possible to do.

  What I would do, is to read the voltage difference between the two pins of the port. It's because I want to measure the temperature (and save the data) in a very simple way. I have 6 thermocouples and I thought weld at the different pins of the RS232 interface and acquire analog signals in mV with the computer. Then, I would use a thermometer to calibrate the values.

  Is it possible to do? How? I searched a lot but I can't find any tutorial or similar to this example...

  No, it is not possible to do it with the serial port. The port is not an A/D converter. A simple RS-232 tutorial will tell you that the port is binary in nature.

• PXI-1042 - switch LED green flashing when the chassis is disabled

  When the PXI-1042 chassis is off, the green signal LED power switch (I use the word "flicker" because the LED flashes irregularly and without full intensity) and the cooling fans will be starts randomly (sometimes one at a time, sometimes both).  When the chassis is on and in use, there is no significant difference in normal operation.  I understand that a flashing green light indicates 'air intake temperature exceeded the operating range chassis' (by Manuel PXI-1042).  I don't think that's the problem, because the chassis works very well when you use it.

  Everyone knows about this problem?  Is this a problem?

  Thank you!

  My biggest concern would be there that it will not warn you when you are outside the temperature range. However, since it does not work correctly when the chassis is turned on, I don't think that there is a problem. Of course, there is no way to know for sure without sending the camera for RMA, but my best guess is that you'll be fine.

  Katie