The streaming of multiple channels directly to CSV USB-6210?

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  I've used a wireless Airport Extreme with Apple TV and 1 or even 2 Airport Express to music streaming at 1-3 stereo systems simultaneously always without delay. Now, using only an AEx and ATV there is an echo of the notice. The system does not wait for the other Aex has become obsolete and is no longer used.

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• Place the data of multiple channels in the tables

  At this moment I have a sample program with a value of 8 data channels of my USB-6009 spitting in a graph of a waveform, which looks and works very well. Ideally, I would like to take this data and manipulate it to produce two calculations before it comes out on the graph. After I would handle that I want to display on a line chart (cloud?) as two lines of updated permanently. I think if I can get my 8 channels in 8 separate tables, the rest should be put in place.

  Thank you

  Hi Iwild,

  How you import your data?  You place data in a table in a first time?

  You use NEITHER-DAQmx?  If so, please see this document that goes over how to use NOR-DAQmx with text-based environments.

  Best regards,

• Basic question about the selection of the AP and multiple channels

  I have about 10 PA (Aironet 1240 G) intended to be deployed one of my floors of office. We examined a diagram of the floor and made sure that we ordered enough to completely saturate the ground with wireless coverage. There are a few AP which are probably only 50' with each other. It's actually a bit exaggerated.

  I put a base on the switch configuration so that there are two different SSID on the access point (one for a production of WLAN and the other for a WLAN comments). Each SSID is associated with a VLAN different.

  I want to know is this what to do on the channels for the AP? Each access point will be independently configured and controlled.

  I understand that there is a way to control which channels each AP uses, but I'm not familiar with the controls or best practices for the configuration of the AP

  Can I do something like make sure that each access point uses a different channel than its nearest adjacent neighbors? Someone would mind sharing what is the command to do it, and where it is applied?

  I have read through some archives and saw people talk to set "no bunk channels" and to configure them to use 1,6,11 channels. I guess I don't understand what is meant by there.

  Manually define you an access point to channel 1, then set his neighbour to use 6 and another neighbor to use 11, and then you who stay?

  What is the worst of the scenarios on what happens when you have no AP too close to the other located on the same channel?

  It is a pleasure to read through the documentation if someone wouldn't mind pointing me to it. I'm still trying to understand the concept, and then I should be able to understand the documentation that came with the AP.

  Thank you for your help.

  If your stand-alone Access Points. If it was a deployment of Comptrollership, in fact to dynamically manage the channels for you.

  But what you really want to do, is you see APs do something like this:

  (imagine each number represents an access point, and it channel)

  1 6 11 1

  6 11 1 6

  11 1 6 11

  1 6 11 1

  It is a conceerne configuration guide. I think he has a small section on the channel assignment. If you do this manually, I think that you specify the actual frequency used in the CLI instead of the channel number.

  http://www.Cisco.com/en/us/docs/wireless/access_point/12.4_3g_JA/configuration/guide/s43rf.html

  So the CLI under the Dot11Radio0 you would do something like 'channel 2412' for channel 1... 2437 for 6, 2462

  for 11...

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• Dedicated for each channel from multiple channels in a single task task disadvantage

  Hello

  My current acquisition software (C + c++ / GCC) encapsulates the methods rather clumsy niDAQmx C to interface with the data acquisition equipment in a class that represents a task of acquisition. This way I can create several instances, for example counter input, analog input, analog output, their terminals and the class supports all work low level as ensuring input analog fake internal is started if there are only counter entries such as the sample clock starts, or configure reminders N-sample, etc.

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  in-house.

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  I don't know I'm missing something here. Maybe someone can explain it to me, maybe some limitation of multi-tasking, I have not yet read.

  Hey!

  Unless you specified for managing the it (simultaneous sampling) or modular instruments and hardware devices (see link )

  You cannot perform two tasks at the same time that access to the analog inputs, for example, because the

  ADC is a shared resource that is connected to a multiplexer, and that only one task can work in it at a time given. (see here )

  Similar restrictions often apply to other types of operations.

  I'm not aware of any performance issues, perhaps a little more memory could be used.

  So as long as your hardware supports what you are doing, you should be ok, I think,

  and it is only a question of clarity and intelligibility, ease of use and structure.

  As you use classes, I'm sure you've heard about encapsulation - so it is a

  question of how you want to design your application.

  In addition, when you work in LabVIEW, tasks feel more natural to the principle of data flow, because you have a thread for your data acquisition,

  and it works very well with our modes of standard design.

  So, if it is better for you (and works with the hardware), you can give all the channels its own task.

  Hopefully this might clarify some things,

  Kind regards

  Rome

  OR Germany

• How do switch you between multiple channels to indicate which channel to acquire the data from?

  I'm trying to builld a VI where I can have an option to enable or DISABLE multiple channels depending on the modules plugged into the chassis and then acquires the data of the channels which are turned on and where other acquisition parameters do not change. Is there any specific/switch where can I do this? Please answer as soon as possible. Its quite urgent. Thank you

  You use DAQmx?  To change the assignment of the data acquisition channels, you must close the currently open session and then create a new session with the new channel definition.  So the order of execution:

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• The best way to channel multiple steps using NI USB 6009?

  I'm new to labview and I am trying to acquire multiple voltages of several channels and spread them out on a chart. It seems impossible to do it at the same time since the NI USB 6009 has only one pair of ADC.

  The only way I ever came with is to use daq assistant to support significant tensions one by one and then make it loop awhile, but y at - it any delay during the move between channels?

  And there at - it of best ways to acquire data from multiple channels?

  If you have specified multiple channels (i.e. Dev1 / ai0:ai3) with a single DAQ Assistant, then this is the right method. The inexpensive device has no simultaneous inputs, so you will have to live with the slight delay of channel inter.

• Can we average channel error using multiple channels to measure the same voltage?

  I don't know how correlated error terms are between measuring channels max, but it occurred to me that, if they were relatively independent, I might be able to sample the signal even with several channels and increase accuracy.

  For example, rather than measure a voltage with an AI only at 100 kHz, I could connect up to 10 different lines to HAVE the signal, sample to 10 kHz on each line.  This should allow to reach me on average some of the error associated with each channel (, or so I think).

  Can someone speak definitively to this?

  Thank you

  Sean

  Well, if you are using a MULTIPLEXED Board (everything is not specced for simultaneous sampling) then each channel is connected to the ADC even one after the other, best that you would be able to do is extremely, extremely small variations into the paths of each channel of the multiplexer.  This would still be massively overshadowed by the inherent noise from the system and the accuracy of the device.

  Your best bets to reduce the measurement error is to oversample in one way to reduce the effects of noise and to calibrate the unit before starting each test to keep variations of temperature.  In addition, make sure you keep your calibrated Board (most of the boards have a calibration 1 year of the cycle).

  For some applications, you should also consult wiring field and considerations of noise for analog signals, How to eliminate ghosting of my measurements? and Troubleshooting unexpected tensions, floating or crosstalk on Analog Input Channels to better account for ghosting and the issues of the hour.

• Generation of series in multiple channels

  Hi forum, I need to ask a few questions. Any help is appreciated.

  (1) I need help with the generation dynamic series in several channels. Here, we can see how the dynamic data set generated by a single channel. But I can't find anywhere, how to generate several series signals in multiple channels.

  (2) what is the limit for this generation series? I think it depends on the material, but I don't know, what is the limit. My hardware is SMU-6544.

  (3) it is possible to generate different signals in different channels using scripts? and to start the production in these channels at the same time? the example given in the script generation labview is unfortunately only for the generation of a channel.

  Thanks in advance,

  Kind regards

  Yan.

  Hi Yan,

  Produce on several channels with multiple data is difficult without a tool to view the data, or series of each channel bitstream concatenated into a software ADE and transposed before be downloaded into memory.  To make Visual things here, I'll assume that you want to generate a pattern of 3 bits on sample of channels 0, 1 and 2 is 8 wide.  Assume the following models of the series bit for each channel:

  ch 0: 0101 1010

  CH 1: 0000 1111

  CH 2:0100 1101

  So the question now is, how do you load this in the SMU-6544(or any other HSDIO hardware)?  Of the two options, you can use Digital Waveform Editor (NEWS) to create visually and save to a file type HWS then load a DJ using the API HSDIO.  It is the easiest in my opinion.

  The second way is construction examples of data based on a basic example.  I want to say is you take it all binary streams and built a 2D table so that it looks like:

  01011010

  00001111

  01001101

  An array of 3 x 8 and then transpose the table that turns into:

  000

  101

  000

  100

  111

  011

  110

  011

  Here you can see we have 8 lines, each line is a sample, and in the form of U32 read in decimal, you get 0, 5, 0, 4, 7, 3, 6, 3.  That's what you can load into our niHSDIO U32 function write a waveform.  I hope you can see how this translation occurs and how it looks like in terms of load on the jury.  Each sample usually contains data for all channels, where each bit in the U32 is one of the 32 channels available on your device.  So if you want to write a '1' on Channel 5, you would load a value of 0000 0000 0000 0000 0000 0000 0010 0000 in the form of sample, where the 5th bit is 1 and all the other bits 0.  In decimal, you would write '32' value.

  With regard to the limitation of the size of series, if your flow rate is slow enough you can disseminate and make an almost endless stream, but assuming that you are running at the maximum rate, your series of waveform size is limited by the size of your on-board memory.  Since each sample generation is 32-bit, which is 4 bytes for example, if a memory size of 32 MB will correspond to 8MS bitstream series max.

  For any questions or comments are welcome.  Thank you.

• PCI-7730 does not move in the order of driving different directions?

  I have a 7330 motion control card that I'm driving a shaft on both (so never 1 d moves). I need to be able to move in both directions, which is fairly easy to do using a change (modified to include the limits and home) example VI (I think it was the example of 1 d linear motion). To effectively run my stepper motor for my application, in step/direction mode, when moving to the direction of stage negative (for me it is the 'Blue' in my dye laser) I need to overshoot and then come back so that the engine always ends with a movement from the red. I tried several solutions to this problem, including:

  1. in a VI copy/paste on the screws under necessary motion in order, but specify a 'number of steps to move' for the second piece

  2. call the same Subvi sequentially (so rather than a long VI a VI with calls to conduct main proposal sub - VI) with various implementations of delays and sequencing

  The problems I encounter are:

  When using a single move VI (then go one direction up to the complete removal), I can almost always move properly, be it positive or negative direction. Occasionally, and especially when you try to go in a different direction than the previous move, the engine is not. I can watch it on my oscilloscope monitoring steps returned by the engine. The stages of start-up, but about 4 pulses in the VI closes with no error reported (and with the release of that word because, it seems that the program thinks that the move is successful). However, when you use the VI that he calls one way and then the other, I can * never * get the second move (the opposite of the direction) to happen. In 20 years, I even put delays between them in a structure of flat sequence without result. However, I can move one direction, and then immediately the same direction successfully with the same code.

  I can't find a 'free channel' or the ability to set regardless of the behavior of management (for example, direction set out to a negative displacement before the negative move, then reset for a positive move before the move is necessary in fact). It is quite possible, Miss me a crucial part in my VI main motion, but then I think that the repeated movements of single direction would fail more frequently.

  Is there a way to define the direction prior to a move? Or has anyone else encountered this problem and found a solution more "elegant"?

  Thank you!

  A. Berke

  Note: in order to generate enough current to power my motor (it has optically entered remote), I added my own resistance to the stage and the wiring of the direction as they head towards the engine.

  I solved this in case someone else has a similar problem. It turns out that he should be careful with the card ID. It can only be called once (so multiple calls to secondary screws using the same ID Board in a "main" program does not work unless the ID is passed to higher level) in a program.

• BVI Interface inaccessible since the addition of multiple SSID

  Announcement to the community for the first time.

  I have a simple HomeLAN which consists of a Cisco router for series 800-> switch PoE Cisco3560-> Cisco Aironet 1131AG Access Point.

  Everything works well for a while in which I had a simple port to "change the access mode" configured on the switch facing the AP and one SSID on the access point that is configured in stand-alone mode (without controller).

  My provider has enabled IPv6 on my broadband connection and I started to reconfigure my installation this afternoon to allow this.

  I decided to run only a bunk Dual LAN and a separate native IPv6 only test LAN for proof of concept.

  With this in mind, I changed the switch port to the access point to a "mode trunk switch' using simple dot1q encapsulation. I have also consulted the post helps very https://rscciew.wordpress.com/2014/05/24/multiple-ssid-configurations-on... after finding in this community post on the topic of multiple SSID https://supportforums.cisco.com/discussion/10899511/how-broadcast-2-ssid...

  I have now two SSID broadcasting (we will call double stack and ipv6 only for the sake of the argument). The SSID double stack uses VLAN 2 and 1 bridge, while the SSID only ipv6 uses 6 VLAN and bridge 6.

  I must stress at this point that my router (where I want to layer 3 for the two LANs gateways) I have DHCP, DHCPv6 and SLAAC configured on relevant VLANs.

  I seem to be the 2 VLAN trunking of properly and I can see the SSID broadcast in my house. I can connect to the SSID (authenticate and form an association as seen in 'show the dot11 association'), but I don't get an IPv4 address or IPv6 assigned to all clients (I tried Mac OS x, iOS, Android, and Windows phone). Furthermore, I can't ping the IP bvi1 of the AP - that is the element that is annoying me more that I must console to the AP to make any changes at all.

  Here is an overview of my AP configuration, with relevant parts removed for safety...

  dot11 syslog
  !
  dot11 said ipv6 only
  VLAN 6
  open authentication
  shared authentication
  authentication wpa key management
  MBSSID-guest mode
  WPA - psk ascii 7
  !
  dot11 said double stack
  VLAN 2
  open authentication
  shared authentication
  authentication wpa key management
  MBSSID-guest mode
  WPA - psk ascii 7

  interface Dot11Radio0
  no ip address
  no ip route cache
  !
  the cipher mode vlan 6 encryption tkip aes - ccm
  !
  the ciphers of vlan 2 encryption tkip aes - ccm mode
  !
  has declared ipv6 only
  !
  such double stack
  !
  MBSSID
  root of station-role
  Bridge-Group 1
  Bridge-group subscriber-loop-control 1
  Bridge-Group 1 block-unknown-source
  No source of bridge-Group 1-learning
  unicast bridge-Group 1-floods
  Bridge-Group 1 covering-disabled people
  !
  interface Dot11Radio0.2
  encapsulation dot1Q 2
  no ip route cache
  Bridge-Group 2
  the bridge-group subscriber-loop-control 2
  Bridge-Group 2 block-unknown-source
  No source of bridge-Group 2-learning
  No extinction unicast by bridge-Group 2
  Bridge-Group 2 covering-disabled people
  !
  interface Dot11Radio0.6
  encapsulation dot1Q 6
  no ip route cache
  Bridge-Group 6
  the bridge-group subscriber-loop-control 6
  Bridge-Group 6 block-unknown-source
  No source of bridge-Group 6-learning
  No bridge Group 6 unicast-flooding
  Bridge-Group 6 covering-disabled people
  !

  interface FastEthernet0
  no ip address
  no ip route cache
  automatic duplex
  automatic speed
  Bridge-Group 1
  No source of bridge-Group 1-learning
  Bridge-Group 1 covering-disabled people
  !
  interface FastEthernet0.2
  encapsulation dot1Q 2
  no ip route cache
  Bridge-Group 2
  No source of bridge-Group 2-learning
  Bridge-Group 2 covering-disabled people
  !
  interface FastEthernet0.6
  encapsulation dot1Q 6
  no ip route cache
  Bridge-Group 6
  No source of bridge-Group 6-learning
  Bridge-Group 6 covering-disabled people

  Bridge IRB

  1 channel ip bridge

  interface control2
  MGMT AP Interface Description
  address 192.168.1.6 IP 255.255.255.0
  no ip route cache

  IP default-gateway 192.168.1.50

  As you can see I can not ping the gateway of AP - I would be very grateful if someone could point me in the right direction with regard to what I'm doing wrong here?

  Thank you

  Mick

  OK means your AP is to have IP vlan2:

  Do it like this and try again:

  !

  interface Dot11Radio0.2
  encapsulation dot1Q 2
  encapsulation dot1Q 2 native
  Group 1 bridge
  Bridge-Group 2
  !
  interface FastEthernet0.2
  encapsulation dot1Q 2
  Group 1 bridge
  encapsulation dot1Q 2 native
  Bridge-Group 2

  !

  Or alternatively, you can delete the name native dot11radio0 and fa0.2. (It should also work without it), but be sure that for vlan 2 you have bridge Group 1.

  Concerning

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• Replace negative values in multiple channels with "0'.

  Hello

  I'm calculating and then by creating a cumulative channel, multiple channels. Negative values in these channels aren't necessary, and I need a nice way to replace each negative value in these channels with a value of '0'.

  My current code is:

  Do
  Do
  If Data.Root.ChannelGroups (2). Channels (i). Values (II)< 0="" then="" data.root.channelgroups(2).channels(i).values(ii)="0    ">
  II = ii + 1
  Loop until the second > Data.Root.ChannelGroups (2). Channels (i). Properties ("length"). Value
  II = 1
  i = i + 1
  Loop until I > Data.Root.ChannelGroups (2). Channels.Count

  It works, but I don't like. He adds a few seconds when running my script, which was almost instantly. Is there a better way to do it?

  Thank you.

  Hello Kevin,

  The fastest way to go through a channel and check the values less than or equal to 0 is through the canal's calculator. The code below takes all the channel first channel group (with the exception of the first string that is be the weather channel in my example data set) and replaces the values<0 with="" 0="" through="" the="" iif="">

  Set Group = Data.Root.ChannelGroups (1)
  
  iMax = Group.Channels.Count
  
  FOR i = 2 to iMax
  
    Adjust the strings = Group.Channels (i)
  
    Formula = "= IIF (y '.<0, 0,="">
  
    Call to calculate (formula, Array("y"), Array (Channel))
  
  NEXT ' I

  In this example we overwrite the existing values of data channel with 0, but you can also copy the channels to make sure that your raw data is available.

  The calculator of channel is extremely fast for this type of operation because it does not create a loop to go if each line separately and check the values he...

  I hope this is useful,

  Otmar

• DAQmx showing not readings to multiple channels

  Hello

  I am trying to acquire values of temperature of 3 consecutive using a task DAQmx channel as shown in the attached photo.

  I have a loop of producer-consumer for fast reading and writing samples in a file.

  To specify the channels, I typed in the box connected to a terminal of "physical channel" (not shown in picture) as follows:-SC1Mod2 / ai2:4.  This is to acquire a reading of analog channels 2, 3 and 4. The program must then write a file reading on channel 3.

  The code works perfectly if I purchase samples of 1 channel only.

  When I try to acquire multiple channels, I don't see readings on one of the task of acquiring Wired Digital indicators.

  I would appreciate your input on what might be wrong with the code.

  Thank you.

  kumv10 wrote:

  The broken wire seen in the photo is the result of adding more channels to the task of acquiring.  I managed to get around this by specifying a different, but even with an intact wire data type, the program is not displayed readings since the 2 remaining channels.

  Instead of use for dynamic data Type, then the channels Split, just use an array of Index to get your three values.

• Why do write can not be performed because the number of data channels does not match number of channels in the task.

  Possible reasons:

  Scripture cannot be performed because the number of data channels does not match number of channels in the task.

  When writing, provide data for all channels in the task. You can also change the task so that it contains the same number of channels as the written data.

  Number of job channels: 8
  Number of data channels: 1

  Lama says:

  The DAQmx vi writing gives me the error. If I run a single channel, isn't a problem. Multichannel gives me error.

  You are funny! Why tie yourself to work VI (single channel) instead of one that gives you errors (multichannel)?

  (If your car does not work, you bring car your wives to the mechanic, right!)

  What is the exact text in the multichannel 'physical channels' when you do the AO control?

  Lama says:

  I did a sequence to ensure that each function has been run in the correct order. Wouldn't a race condition.

  All you have to do is wire the 'start of task' error at the entrance of error of the DAQ assistant and then back to 'stop task' and things will run in order. Guaranteed! Think the stream! Everything else can run in parallel or the order is irrelevant.

  First convert the sequence stacked to a sequence of plate, remove the flat sequence and add the mentioned son. Now, do a "cleaning pattern.

  A when stacked with the inhabitants of the sequence is one of the worst construction you can possibly do. It makes the code difficult to follow, impossible to maintain, difficult to debug.