connect multiple signals card NI USB-6341

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• Amnesty International and counter sync + USB signal stream (USB-6210 vs USB-6341)

  Hi all

  I'm at a stage of identification of a material suitable for the following tasks:

  • 5 analog inputs (AIs) of reading at the same time, tensions at a rate of kSps (at least) 10,
  • application captures 2 inputs using timers (detection of contours with timestamps), square wave entry with duty ratio of 50 percent and about 1.5 kHz frequency and variable pulse width / frequency (from 2 sensors hall, representative of the DC motor rotation speed and direction, quadrature signals), resolution of timestamps should be (at least) 50 ns,
  • AIs and counters should behave in a deterministic way, and must be synchronized in a way,
  • data to be transferred via the USB port of a host computer with Matlab Data Acquisition Toolbox (unfortunately not LabVIEW).

  I've identified the long USB-6210 USB-6341 and potential candidates of material to accomplish the above tasks, but after reviewing several documentation and the topics of the forum, I'm still a bit confused, if both are fully working and my approach described below is not working properly.

  Counters: I intend to use the internal time base available 20 MHz as being the source of meter to get into account the resolution of timestamp 50 ns. External impulses hall are used as sample clock (about 1.5 kHz, see above). As the pulse width varies, the sample clock is not constant.

  AIs: Using a 10 kHz internal clock signal derived from the time base of 20 MHz for timing and analog inputs (trigger) start-up and counters simultaneously material should translate into the required synchronization and deterministic behavior.

  It work? Other recommendations?

  Next is the USB data transfer: all HAVE 5 and 2 data entry of the meter must be correctly transferred to the host computer (the corresponding rates are shown above). USB-6210 is capable of 4 USB signal flow, device USB X range (6341) offers 8 of them. Unfortunately, I could not understand the exact meaning of the expression "signal flow" still. Do I need 1 flow of input signals (would be 7 for my application described) or 1 stream for all analog inputs and 1 for counter inputs (lead 2 streams for my request). Is there no further details on this approach (more than Streaming of signals of NOR) USB signal flow?

  Any challenge to the described application that I might have forgotten? 6210 USB seems to a very limited number of entry PFI, maybe even too low for my meter participate application?

  Looking forward to your comments and advice.

  Concerning

  jAwA

  1. I recommend the X-6341 series on the M-series 6210 sake of counters/timers.  It is more of them, and each of them is more capable.   It can also have a great FIFO embarked for meters that may be important in certain tasks, although I don't think that you currently deal with one of them.

  2. your general concepts on timing & sync are satisfactory.  You will be able to share and to route signals that help ensure synchronization and determinism between the timestamps for your various tasks.  Note that for meter entry tasks, you need set up the trigger 'Arm Start' rather than the regular start trigger.

  3 is not authoritarian, but I believe that the flow of signal # will correspond to the tasks #.  For you, it would be 1 task of HAVE and tasks CI 1 or 2.  (Not clear if you have 1 Encoder with 2-channel quad that would require 1 task of CI, or if you have 2 encoders with 4-way quad).

  4. pay attention to the hall effect signals that are not virgins.  Digital filtering is available and probably better on the X-series, the series M.

  5. strictly speaking, edge detection is a type of digital input task that produces samples but no timestamps.  Ideally, I would like to parallel wires on the two digital inputs for the entries of detection and counter change to position quadrature decoding.   Then I would sample the counters Encoder 1 or 2 using the internal pulse 'event of detection of change '.  I would create another counter timestamp change detects pulses as well.

  -Kevin P

• Computer does not start when connected to USB-6341

  Hello

  When my board 6341-USB is connected to my computer and the device is on, if I start the computer the USB-6341 module, the computer crashes before windows starts.

  I said that the computer is an HP with Windows 7 64 bit computer. All Boot on USB configuration are disabled.

  Is it possible to start the USB-6341 before the computer or not?

  Best regards

  CFOE

  Hello

  Unfortunately with my HP computer, because the HP hardware, the computer cannot be started if USB-6341 is connected and powered.

  Best regards

  CFOE

• It is supported to connect multiple monitors using USB as a video source?

  Original title:

  USB touch screens

  It is supported to connect multiple monitors (specifically wireless) using USB as a video source?  If so, a hub would be able to handle this or the USB connection should be made directly to the motherboard or the PCIe interface.  Thank you!!!

  Hello

  Thanks for posting your query in Microsoft Community Forum.

  You can buy a switch HDMI that allows you to connect several devices to sources HD (e.g., monitors, TVs etc.) to your computer, while using only one cable HDMI (VGA or DVI) of your computer to connect to the second monitor. So you can get a HDMI switch on your favorite search engine for compatibility information for the switch with Windows 8.1.

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• counter multiples or usb 6341

  Hello

  I m working on acquiring data usb 6341 and facing a problem. When I use two frequency counter in the same program, it fails to calculate the frequency (frequency meter task crashes). but when I use only one frequency counter works properly.how can solve my problem...?

  
  

• Measure the time of the rising edges of a digital stream using a USB-6341

  I have a DAQ USB-6341 map.

  I use Measurement Studio (writing code in c#) on a Windows 7 computer.

  I'm relatively new to the DAQ cards, programming, so I could ask something that is obvious (sorry if this is the case).

  I went out a stream of digital pulses to an analog output channel.  I wired this channel to one input of the meter channel.  I am able to measure the number of edges upward to the inlet of the meter channel (since the digial flow is continuous, the number of rising edges increases with time).

  I would like a time stamp of each rising transition and I like to keep these timestamps in a table without ever growing (or maybe bin these timestamps in a histogram).

  Set up the meter channel to provide the timestamp data? (rather than just count)

  Thank you for your help.

  WRB,

  The meter must be able to measure the relative time between the different edges of your signal.  To do this, you will take care to set the meter to measure time.  It will measure how long a full period of your signal takes.  You can configure edge that you want to start with.  You'll want to set up your timed 'implied' measure.  This sets up the meter to automatically take action whenever a period is over.  While it's not exactly a timestamp, you can find the distance between two edges by adding the time periods between the banks in question.

  I see another technique that you can use.  This would put the counter to edges of County one of the basics of time of your device (it has 100 KHz, 20 MHz and 100 MHz bases long).  Then configure the task to use your signal as a sample (configuration to use rising edge) clock.  Whenever the song occurs, you will get the number of ticks ticks selected timebase that took place at that time.  One thing to note here, however, is that the counters are 32-bit wide, so your code will have to manage the overthrow of this charge if you are using a fast time and base running for long periods of time.

  Hope that helps,

  Dan

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  I saw the specifications of your computer.  He has only two PCI Express X 16 slots for video cards. one is available.  There are three ways that you can go: 1) buy another video card to fill the vacant unit 2) buy a USB video adapter or 3) buy a nVidia Quadro or another workstation that supports multiple video cards.

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• Send the signal current/voltage/USB DB25 to regulation of pump to

  Hi all!

  I want to control the speed of a pump with LabVIEW (Thermo Fischer FH100M, Manual) and so I have to send a current or a voltage signal to the pump. The pump has only one DB25 port. As my laptop is not a port DB25, I tried to control it with a USB converter.

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  When you say "Converter USB to DB9" are you referring to a USB converter to RS - 232? DB9 is just a connector and therefore DB25. TOU can wire anything to this connector.  Your converter is probably wired as a serial RS-232 port.

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• Model generation with USB-6341?

  Hi all

  We have developed a software quasi multifunction 'device-independent '. This sw is capable of generating the sequence shot timed with the device really used. Up to now, we have used devices PCI-6025 and USB-6221, but now we bought a USB-6341 and when I try to use a message of 200565 error pops up: "specified digital channel contains more bits supported by the version 8 bits of the Port DAQmxBase write.» Use the version of DAQmxBase Port write who takes in charge the broader digital ports. Minimum size of write in bits: 32 "

  I tried to change PORT0, PORT1 and PORT2 but only PORT0 is legal for the model generation process and it requires DAQmxWriteDigitalU32 function...
  I don't understand why.

  a / 6341 contains 24 DIO lines
  b / only 8 DIO lines are clocked by material

  Then there are 24 DIO lines (i.e. 24-bit 32 no!), but only 8 lines are timed by the hardware and I want to use only this 8 lines for model generation!
  Our whole software is based on 8-bit pattern-berries (writeArray type is "uInt8"). If we cannot use this structure, we must rewrite dozens of functions...

  So, how can we use the function of DAQmxWriteDigitalU8 with USB-6341 or what can we do?

  Thank you

  -George Cs.-

  Dear George,

  It is an interesting question, which may seem a bit unintuitive at first. The main reason for the 32-bit write operation (although the USB-6341 has only 24 DIOs) is that the functions and the driver support other devices too. As you can see in the manual of the unit (http://www.ni.com/pdf/manuals/370784d.pdf) X Renault series supports digital IOs up to 32 bidirectional signals.

  To keep things consistent exploitation of 32 bits is required even if you use only a subset of the available ports.

  I hope that this helps to explain.

  Best regards

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