Interference between DAQmx and VISA?

Similar Questions

• Difference between DAQMX and DAQMX base. Task list empty

  Hello

  Can someone please explain the difference between NOR-DAQMX and NIDAQMX base?

  I have recently installed Labview10.0 and NOR-DAQMX base on linux opensuse 11.4 3.4.0. Everythinng works very well. The device is recognized by labview and I put my controller and chassis using nipxiconfig. The DAQ assistant function is missing and also the drop down task and channels is empty, even if I create a new task using the basic NIDAQMX configuration utility.

  Can you get it someone please let me know where I'm going wrong?

  Thank you

  The DAQ Assistant is a Windows program only, DAQmx only.  It not Linux or with DAQmx Base.  DAQmx basic tasks and channels are a little different (I think) counterparts DAQmx.  The fall to the bottom of the list of basic parts, or is it only DAQmx?

  Lynn

• sending sms with commands, difference between hyperterminal and visa

  Hi all

  I want to use my phone mobile access to content by using commands. When I type the command in hyperterminal, it works, but when you send it through LabView rs232 instead of 'OK', I get the same that I just sent. What is the difference between sending tanks into HT and visa?

  When I type (in HyperT)

  AT, I get

  Ok

  When I send

  AT (in LabView) get

  AT

  ??

  You send a stop character? Use \n for a newline or \r for a carriage return. Your order/string constant must be defined '-' display of Codes for it to work. Look at the example of basic series to write and read.

• Difference between DAQ and DAQmx for acquisition of data PCI 6534

  Hello

  I use the PCI DAQ 6534 card for my digital I/o transfer. I am beginner in the labview.

  I want to store the data coming in memory and the reading of the data at the level of the trigger.

  I have seen the examples in the labview. Some have used DAQmx and DAQmx read write that screws and some have used the confg DIO port and all...

  So I want to know the difference between these two. For my application that I use?

  Hey Bo,

  First of all, I would recommend that you discover the NI 6533/6534 for NOR-DAQmx help. You may be able to find some of your answers in this help document. Now for what you try to do in your application, it looks like you are only buying data. If this is the case, with the 6534, the device acquires data in memory shipped as soon as the DAQmx series start task VI, as long as you don't start hardware triggers have in place. If you have a trigger of starting material, then will make the purchase of the aircraft after the DAQmx start task VI and only after you receive this material trigger. If you call not the DAQmx Read VI, then the data will be stored in the memory board for you, as the driver manages this data in the on-board memory storage, until reading DAQmx VI is called, which at that time, data is transferred to the Board of Directors in the memory of the computer. Once you get it in the computer's memory, you can do whatever you want with these data, as this graph or treat. If you look at the sample programs (which have been mentioned on how to find those in a previous post), you can find an example that little shows you how it works. One of the examples that you can check is called reading Dig Port-Ext Clk.VI. In this example, it sets up to read a finite number of samples and then starts the task. If you set a breakpoint on the line of the error after the VI begin, the data will be acquired in the amount of on-board memory. Then when you cancel the break of the VI, data will be extracted from the amount memory embedded in the memory system with the reading VI DAQmx. Again, the pilot takes care to put the data in the memory board for you once you start the task.

  I hope this helps. Please let us know if you have any questions or concerns about this issue. Also, certainly, discover and try to run all the programs related to the 6534 examples so that you can learn how the equipment works and how to use features to do what you want your program to do. Also, be sure to read through the help on the 6534, as well as the help of VI documentation to learn what makes each function. Thank you and have a nice day.

  Kind regards

  DJ L.

• VISA writing differs between TS and LV Run - Time Engine development agencies

  Hi all

  I made a request on LabVIEW to test the BERs (Bit error rate), and I used the Write VISA between two COM ports to Exchange data.

  Everything works great using just of LabVIEW.

  Later, I used TestStand to call my application (VI). Adapters of LabVIEW TestStand have been set by default on the development system , and everything works OK!

  Finally, I had to disable the development system and to define the types of adapters LabVIEW of TestStand for LabVIEW Run-Time Engine and I noticed that the speed of the exchange of data between two COM ports significantly decreased.

  The only difference was the speed... because all data (changed slowly in this case) happened correctly on the other COM port too.

  The symptom was the same that decrease baud rate... but baud rate and all other configurations remained the same. The only difference was the change between the development system for the runtime to notice this reduced speed between the data exchanged using VISA Write.

  All the solutions for this?

  Thanks in advance

  João

  Hi all!

  I'm sorry, I forgot to reply to this thread...

  Solution was change the way VISA WRITE of "asynchronous" to "synchronous" to book a thread just to WRITE visa.

  The problem here was something like this (?): TestStand used all available threads and when we wanted to WRITE of VISA, the thread has been busy and VISA would wait until the wire emerges. After changing to syncrhonous, there was a thread dedicated to this process (?).

  Now, everything works the same using LabVIEW Run-Time Engine or system deployment.

  Thanks for the help Chris and Norbert :-)

  João

• DAQmx and SCXI-1160 with 'DAQmx switch Open Relays.vi '.

  Hello

  I use DAQmx to pass the baton on a map of SPDT 16 SCXI-1160. When I run the 'DAQmx switch Open Relays.vi' with the entry "ch0/SC1Mod1 / ' I think the relay normally open position 'NO '. But this is not the case, the relay is in the position of the NC. Here are the steps I do a simple VI.

  1. define the topology of the 'SC1Mod1' to '16/1160-inverter.

  2. call the 'DAQmx switch Open Relays.vi' with the string "/ SC1Mod1/ch0.

  3. then I take a physical measurement, with a multimeter on the SCXI-1324 terminal block and the relay is in position "NC".

  4. If I run the "DAQmx get relay switch Position" he's back "Open"!

  Is this the good behavior, and if so can someone explain the logic behind it.

  Thanks in advance,

  Michel

  Hey Michael,

  Sorry, I didn't know that you were actually able to control the relay and you receive just the reverse logic. To answer your question, on the SCXI-1160 module, there are three connections for each channel: COM, NO pine and pine of NC code. Reset, COM is connected to the spindle of the NC. When you issue a command to OPEN channel 0, COM will stay connected to the NC pin, even if the software indicates now that the PIN is open. When you issue a command NARROW-gauge 0, COM will be now connected to pin number and not on the spindle of the NC.

  A better way to think of it, is to focus only on the relationship between COM and no. pine. When you send a BLANKET order, this connection between COM and no. will be open. When you send a CLOSE command, the connection between COM and no. will be closed. Consult this manual for a visualization of how this switch is set up: http://www.ni.com/pdf/manuals/320513b.pdf. Refer to page 2-9 and 2-14 of this manual for pinout.

  -Nathan H

• Delay between angle and entered analog on a 6221

  Hello

  my test setup consists of a (8184 current run LabVIEW RT) embedded PXI controller which uses a PXI-6221 of data acquisition. One of the outputs analog of the 6221 creates a demand for speed that is sent to a servo controller. the servo drives then the test configuration. Between the servo and the remaining test configuration, a quadrature encoder is located. Both the 6221 meters are used to measure the position of the servo (using the trains of pulses A and B) as well as the speed of the servo (frequency of A pulse train). In addition to these counter inputs, some analog inputs of the 6221 serve as well to recored the configuration of test signals.

  In this configuration, one of the analog signal has a frequency of n periods per revolution of servo (determined by the mechanical design of the test facility). But when I leave the servo turn to for example 100 rpm, then decelerate from status quo with a constant deceleration and then draw the analog signal against the measured angle, I see clearly that as long as the speed is telling, I n periods per turn (or a passage from my analog AC to zero each 1/2n towers); However, as soon as the slowdown begins, the plot gets stretched along the axis of the angle (so the plot tells me there are less than n analog periods per turn, which is impossible because it would require the mechanical destruction of the facility).
  However, I can calculate a position based on speed information signal, as I got to the second counter (by integration of the speed). When I do this for the above velocity profile and draw the analog signal against the calculated angle, I see exactly n times / revolution, no matter how fast the installation program is rotating (just the expected behavior).

  So, apparently, the speed measured is "in phase" with analog signals, while the measured angle has a "phase error. Draw the angles measured and calculated against the time tells me the same thing: the measured angle is always late (compared to the calculated angle). The period is not constant throughout the measurement; I've seen values between 30 and 170 ms within a single record. Due to this change of variable, inserting a delay for all channels, but the angle is not a great idea.

  Unfortunately, calculation of the position of the speed signal is no option for me, because the direction of rotation is changed during measurement; because speed information I have based simply on a frequency of pulse train, it contains no information management, therefore a calculated position would be unaware of the changes of direction.

  Does anyone have an idea whence thios delay and what I can do to fix this problem?
  Try a position different methods of decoding or exchanging the meter channels has not made a difference.

  Thank you!

  Hey Kevin,

  attached you will find the last block diagram (no new translation this time, since no changes have been made that require a), which includes your last suggestions (explicitly start the task of AI, remove the excess constraints) with a flat sequence structure that applies all the preparations of task to finish before the start of the first task (I know I could have achieved the same effect of intelligent routing of the signal error, but I think the code is) better readable this way).

  Without OPI, LabVIEW tends to start to have, ao and tasks of the angle of the very different moments, which (for some reason that I don't understand - we have a sample clock based calendar here, and the sample clock is run, well after the three mentioned tasks...) tends to cause delays in the order of several 10-100 ms between tasks. With the structure, this problem is eliminated.

  The Sub - VI just above DAQmx writing contains the "conduct" code that I used in the last screen shot to "serialize" the requested speeds - in this way, the table that contains the requirements of speed does not need to be rebuilt.

  The code that creates a weather channel frequency implicitly timed measure left the VI shown here in a second VI that is running on the host computer, because everything that involves a calculation and does not require any intzeraction with the DAQ hardware is better placed there (the 850 MHz on the PXI controller celeton is slower than 2 definitiely something host GHz Dual-Core system).

  The behavior you mentioned for the task "not started" HERE is what wrote using LabVIEW. I thought the block of relaxation that I had at the beginning would treat the start of the task - at least, the code like this figure repeatedly in the examples that come with LabVIEW.

  I don't really understand what has caused the problems I've had - it seems that it was the combination of the measure quickly loop iteration with the start of task based on trigger HERE, but I do not understand what are the mechanisms in the background caused the problem (too forced loop was not the cause; the same block diagram works well with an additional loop timer).

  If the solution was composed of the following steps:

  -remove the old code calculating speed, replace it with a better code out of the main loop. This allows to

  -reduce considerably the frequency of the main loop.

  -Pull the DAQmx writing out of the loop, and

  s ' ensure that all tasks are started explicitly just before the main loop starts to run.

  -Possibly remove excess constraints of the main loop.

• It takes up to 4 minutes for the player switch between library and Rip, and vice versa.

  I run Media Player 11 on my XP machine with spare 120G on the C: memory and 3G - recently, it takes up to 4 minutes for the player switch between library and Rip, and vice versa. I have re-installed twice but no change. No new software has been installed before this time.

  Hello Absno69,

  Thank you for your message.  You mentioned that there were no new software installed before that happens.  Were there any hardware changes or updates?  If this isn't the case, we will perform a system restore to a point that you know that your system is working effectively.  Click HERE for the system restore instructions.
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• (Vista) Is there a PRACTICE way to switch between speakers and analog headset?

  (Vista) Is there a PRACTICE way to switch between speakers and analog headset? Must I ALWAYS return the default setting, depending on which audio output device I want to use?

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  Thank you and best regards,

   

  Srinivas R

  Microsoft technical support.

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