Similar Questions

• NEITHER USB-8452 - reach the maximum write SPI speed

  Hello

  I have a USB-8452 with the latest version of the software installed (2.1.2). The host computer is a Core i7. I am trying to achieve the maximum SPI write speed with the camera possible. I tried the basic block read/write SPI, SPI Scripting blocks and SPINNAKER streaming, but the first two have large delays between CS falling and the data being written (with so that delays in loop), and the last seems to be useful only for read operations.

  Can someone tell me if there is a way of a) reduce the time of installation for basic SPI / SPI Scripting or b) writing different values in a single stream of SPI? Thanks in advance for any help on this issue, even if it's just confirmation that yes they is hard limits that cannot be overcome with the LabVIEW 8452 interface at this time.

  Here's the best I can do right now, as shown in my logic analyzer. Change of the SPI clock speed does not affect installation time and delays that are primary and secondary bottlenecks:

  SPI read/write database-

  Program: Basic Configuration followed by read/write of SPI block itself in a while loop

  Main bottleneck: ~ 450 delay us into iterations of the loop (see Figure 2)

  Secondary bottleneck: ~ 6 us delay between falling edge of CS and the first synchronization signal (see Figure 1)

  Capture 1 - delay highlighting between CS falling and first SCLK pulse

  

  2 delay highlighting between all iterations of the loop of capture

  

   

   

  Scripts of SPI-

  
  Program: Followed two Script blocks Basic Configuration run in a while loop (to check the two block to block and delay loop iteration)

  
  

  Main bottleneck: ~ 450 delay us into iterations of the loop (see Figure 3, space between the second and third images captured)

  Secondary bottleneck: ~ 250 us delay between blocks of Script run consecutive (see Figure 3, space between the first and second captured images)
  

  Capture 3 - highlighting delays consecutive run the Script and delays between while the loop iteration
  

  
  

  SPI in Streaming- It's the closest to achieve a fast writing speed, but unfortunately, it seems to be only useful for read operations (e.g., ADC), do not write.

  Program: Configuration of the base stream followed by start of the flow block

  Main bottleneck: impossible to write something else than the data value unique property "wave 1-> MOSI data." I can write a byte array to this property, but it will simply put all these bytes in an image and repeat this framework (see Figure 4) rather than go through each value.
  

   

  4 - two bytes sent repeatedly using SPI capture stream. Delay of CS is finally good, but no possibility to change the MOSI image to image data.
  

  

  Hi JBender1,

  This show looks like what we would expect for a 8452.

  If you need higher performance, I encourage you to watch using a card R or FlexRIO FPGA series for your implementation.

• Can you produce arbitrary data TX with the USB-8452 SPI streaming mode?

  I use a USB of NOR-8452 controller in SPI mode, controlled by a C program compiled in 2013 of LabWindows/CVI. In order to talk to the chip, we designed, I need to control the delay between the final of SPC deassertion and the CS deassertion (T11 synchronization setting) to keep it very small. Therefore, I use streaming mode.

  I read the NOR-845 x Hardware and software manual and looked at the two projects that use the SPI in streaming mode in NOR-845 x examples dir. The examples use two REITS it to talk about the A/D converters. In other words, variable data in time comes from the SPI (ADC) slave to SPI master (Controller NI 8452) via the SPI_MISO line.

  Is it possible to use the USB-8452 to generate variable data in time that goes the other way, from the master to the slave SPI via SPI_MOSI SPI line? Can I make a burst of arbitrary length entry using the streaming mode?

  For example, let's say I have 8 bytes of data to be transmitted:

  WriteData [] is {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};.

  If I try to send this as 4 samples of 16-bit:

    

  ni845xSpiStreamConfigurationSetNumBits (StreamHandle, 16);
  
  ni845xSpiStreamConfigurationSetNumSamples (StreamHandle, 4);
  
  ni845xSpiStreamConfigurationWave1SetMosiData (StreamHandle, WriteData, 8);
  
  ni845xSpiStreamStart (DeviceHandle, StreamHandle);

  I expect to see transmitted:
  

  0 x 0102
  
  0 x 0304
  
  0 x 0506
  
  0 x 0708

  Instead, what I see in fact is the first NumSamples times repeated word:

  0 x 0102
  
  0 x 0102
  
  0 x 0102
  
  0 x 0102
  
  

  Is it possible to generate the first (non-recurring) model? Or streaming mode really is only able to capture input data?

  Thank you for any help you can provide.

  -jskroch

  Hello jskroch,

  I looked through the documentation for the NOR-845 x and it confirms that the workflow capability displays the same MOSI data for each operation of SPI during streaming.

  You can use the ni845xSpiWriteRead function to write a byte array in the order using 1 function call.  These bytes can be configured to your waveform specified.

  Kind regards

• Put 8452 USB in standby mode

  How can I put the USB 8452 in sleep mode where all the pins are turned off.

  Frankmesa wrote:

  How can I put the USB 8452 in sleep mode where all the pins are turned off.

  I don't think that this device has this mode. But I don't understand even why you need this option? You have a LabVIEW application. You can use a State inside machine, Yes? Your state machine can have 'Idle', 'HW Init","Exploitation","Resources HW Close"States (etc.). When you do not want to use the material, just stay in a State of rest, no operation is performed, no resources HW is open beside the LabVIEW software.

  If you want your absent HW in all Windows, then disconnect its USB cable, or programmatically, you can emulate usb removal (devcon utility, more info here: http://digital.ni.com/public.nsf/allkb/1D120A90884C25AF862573A700602459 ).

• Ground connector OEM USB-8452

  Anyone know what the height of the connector for the USB-8452-I2C/SPI module interface connector? I need specificially the OEM module connector plug, but I think that the standard version is just the OEM version that is housed in a case if the connectors are identical. This is the standard height of 1.27 mm IDE? 2.54 mm? I don't currently have one of these modules, but I intend to use it as a daughter card on a new design under development test Board and I am trying to find a connector corresponding Commission of the test I can run a cable Ribbon IDC to coming from the USB-8452.

  Here is an article from National Instruments KnowledgeBase that processes the options and the cable and the connector for the 8452. Connector and cable specifications for USB-8451 OEM and USB-8452

  See Chapter 3 and Appendix A of the NOR-845 x Hardware and software manual for more information.

• NEITHER USB-6501

  Hello

  Could someone give me some information about whether it is possible to use the

  NEITHER USB-6501

  As a generator PWM to control the dimming of 18 power LED function?

  calendar is not so relevant and if the pulse width can be controlled in the PC itself application the purpose would be financed

  Hello ONavarro,

  It is technically possible, but please note that USB-6501 as only software clocked e/s digital (e/s static). In other words the duty cycle of the PWM periodocity Ant you want to generate will be determined by a loop software, so depending on your system and the USB bus. I think that you will not be able to get a better rate of loop (ability to change the State of a digital line) less than some milliseconds (depending on the system).

  By example, if the loop runs at 5ms, and I want 10 steps in my PWM, this means the period will be 50ms, therefore a 20 Hz base frequency. If you can't reach 1ms, you will get 100 Hz. If you want more than 10 duty cycle value, you reduce the frequency.

  And it is NOT stable (loop software 5ms, first delta 5.8ms, then 4.9ms, 5.1ms, 6.7ms, and so on), because it is based on the software. If you need something stable and faster, choose a device with hardware synchronizing.

  Best regards

• NEITHER USB-6008 connect to thermocuples and pressure sensors, control valve

  I am endevoring to build a gasification plant biomass for bench scale test process control plans. NEITHER USB-6008/6009 will be adapted for use as a data acquisition. I'll take RTDS, thermocouples and pressure sensors. I don't want to use industrial automation controllers.  It is also possible to use the channel of analog output for sending signals to a control valve position (using sufficient current/voltage between the two drivers).

  (1) OK.  I just wanted to be sure that you were aware of the potential dangers.

  (2) an RTD is a resistance that has small changes in resistance per degree of temperature change. To measure that you have need of a current source and a sufficient resolution in order to detect small changes.  At 25 degrees C a typical RTD is 109,73 ohms and resistance ohms 0.38 per degree changes.  If you had 1 my crossing this RTD voltage through it would be 109,7 mV and the voltage change of 0.38 mV by degree.

  The resolution of the 6008 on the most sensitive range is 0.49 mV > 1 degree.  The accuracy of the 6008 is 1.5 mV typical.

  For a Type K thermocouple, voltage at 25 degrees is 1.407 mV and change by degree is 39 µV.  Millivolt solving half of the 6008 translates into about 12 degrees.

  If you need a source of excitement for RTD and a kind of amplification for thermocouples and RTD before she would make any sense to try to use USB-6008.

  (3) I have not used anything except LabVIEW with DAQ devices and drivers.  I think DAQmx can be used with MATLAB and other languages.

  (4) the 6008 is the low range made by NOR. You will need to go to a more expensive camera or add signals conditioning circuits.  Talk to your representative OR assistance in the choice of a suitable device.

  Lynn

• NEITHER USB-9162 driver works for MAX and SignalExpress, but not for LabView

  Hello

  I looked for a solution for a while now. According to Web sites OR the NI USB-9162 is compatible with LabView 2012. I installed the last DAQmx. My hardware has been detected and is sensitive to MAX and works very well in LabView Signal Express. But it is not detected in LabView 2012. I searched the forum and not found any solution other then all uninstallation and reinstallation of any. It is quite conssuming time and would rather avoid if possible. Anyone have a solution? I wish I could appreciate.

  Tool:

  NEITHER USB-9162

  NEITHER RIO-9215

  Benjamin

  I reinstalled everything, and now I can work with it. I can't say that I was wrong on the first time, but now it works very well as well as other bugs that are now set.

  Thank you for your answers

• Satellite A200 not power external USB devices in mode 'sleep'

  I have a new A200. I have and USB hub and disc external hard USB powered. When I put it in mode 'sleep' their lights stays on. It came with Vista. I searched for the setting, but I could not find. It is not good for the battery. Any advise?

  Thank you.

  -Sinan

  Hello

  The lights are also on when the laptop is to stay in sleep mode or hibernation mode.
  You cannot disable the led s

• NOR-8452 Stream Mode more than 64 bit?

  I I hava an ADC SPINNAKER which I want to read using the streams API for high (using the NOR-8452) conversion rate but want to read back all 7 channels ADC in a multiple of SPI read command. The maximum number of bits the stream API seems to bear is 64-bit, where I need to really read about 232 (7 x 32 + 8 for the read command). Is there a way to get around this?

  I use the stream mode to detect a DRDY event, but once a single channel is read the output on the ADC chip is reset (so subsequent interruptions come from only on new data).

  Else seems quite limited.

  David,

  The payload you're trying to broadcast is not a standard for the SPI. We try to follow standards SPI and give you up to 64 bits to broadcast both. If you cannot split your readings at separate readings 64 bit, you will not be able to perform this operation with the 8452. If you had another interface, such as FPGAS, you my power to implement a protocol custom SPI on the FPGA. With 8452, however, you don't have these options.

• NEITHER USB-485 box Advanced tab

  I have a USB OR 485 box.  I'm trying to access the Advanced tab that would allow me to change the mode of the transceiver, setting etc, but the tab is grayed out.  Anyone know why?  Thank you!

  You can change advanced options, but you will need to right click on MAX icon and choose Run as administrator to activate the controls. With regard to configuration 2 son, setting changes how we control transceivers, but you will still need to attach the lines together on the outside.

  -Jason S.

• NEITHER USB-6210 - the analog ground-sharing?

  Dear gentlemen/ladies,

  I use NI USB-6210 Council and I have four different devices that I need to join in. The problem is that I have to measure all these four analog signals in LabView with the referenced Single-End Mode, which means that I have four different pins to connect in the same slot of analog ground.

  So, I would appreciate ideas on how to do it. Is it possible to create more analog grounds by software, for example? Or is there an electric simple component that I can use easily share location on the ground for several pins without causing interference to signals?

  I thank very you much for your response, already in advance.

  (My apologies if this forum was not one to correct for this post).

  Hi Stephanie,.

  You can't create more analog designs. On other devices, there are several Earth pins, but they are connected all in-house.

  You simply link them all to pin GND AI because it is what it is.

  I hope this helps.

  Best regards

• How can I get channel z (zero) data encoder with a NEITHER-9411 in scan mode?

  Hello

  I use a cRIO to read a quadrature encoder, and I need z-Canel (zero channel) data using a NOR-9411 in scan mode.

  Chassis: NEITHER cRIO-9074

  Module C-series: 9411

  Encoder: EIB H25 series (model # XH25D-SS-1440-ABZC-28V/V-SM18)

  Now, I installed it using in scan mode and the properties > Configuration parameters of specialty as follows:

  Lifestyle specialty: Quadrature

  Input filter: disabled

  Time base of speed: 4096us

  Index Mode: Disabled

  This replaces Position0 position 1, Velocity0 and Velocity1 module instead of et0, DI1 channels, etc.  It works well to get a reading of the speed, but not the Z.

  I need to know Z as in the rest of my program calculations depend on.  (For this encoder Z is a digital signal that goes low when the encoder reaches 360 °.  It is also a very fast signal.  7200 RPM, it has a width of approximately 3.3us pulse.

  How can I get the data Z in Scan Mode?

  Agile Hello,

  The mode setting of index is the only way to access the Z channel in Scan Mode.  If selected the position will reset when the z channel is detected and the phase of the two other channels corresponds to your selection.

  It seems that you have the real z signal elsewhere in your code.  You may use the position data to generate the Z channel for this purpose?

  Let me know if you have any other questions,

  Sebastian

• NEITHER USB-6211 signal to noise

  While using the analog inputs of the device USB-6211 (Labview 8.5 / Win 7) signal become noisier. By surprise, I got a signal perfect after you have disconnected and reconnected the USB card to the system. This behavior is reproducible for the cards (n = 4) that we use in our laboratory. Is this a known issue with the 6211 card and if so is there a method to reset the map using labview?

  Thank you!

  Christian

  Christian,

  I'm glad that you have solved your problem.  Manuals for most of the DAQ cards NOR recommend resistance of two entries to HAVE to AI GND to ensure that a path suitable for polarization currents exist when it is used in differential mode.

  Lynn

• Starting USB/change SATA mode. Spectrum of HP Touchsmart XT

  I can't seem to find much information about the Touchsmart HP spectrum XT, so I came here with a few questions.
  How to boot from a USB? How can I change my SATA to AHCI mode?

  You are the very welcome.

  There is no legacy mode option?  There must be.  The legacy mode option must be enabled in order to boot from another device.

  Unfortunately, there is no way to change the BIOS setting.

  I don't understand why HP does not provide these options on their notebooks to consumer, but for some reason any, they have not for years.

  The pilot of the RST is supposed to support TRIM SSD's in RAID mode, if it worries you.

  http://www.AnandTech.com/show/5136/Intel-to-add-trim-support-for-RAID-0