When does a clock signal appear on a RTSI bus using DAQmx for a PCI NI-4472 DSA?

Hello,
I am trying to synchronize several PCI NI-4472 DSA boards over a RTSI cable using MATLAB. I have read that with DAQmx it is not necessary to use DAQmxExportSignal to put the clock signal on a RTSI line provided that the RTSI cable is registered in MAX and that the DSA cards are listed as being connected to the RTSI device. Apparently, the DAQmx drivers are supposed to route the clock signal between the cards as required….
So I have done the above and see in MAX, in the device routes tab for Dev1, that
/Dev1/ai/SampleClock uses RTSI6
/Dev1/ai/SampleClockTimebase uses RTSI8
Right now I am monitoring the RTSI lines on an oscilloscope in the hopes of detecting a clock signal on one of the three boards in the system while one board (the eventual master) is acquiring data using the Test Panels in MAX. I am getting nothing on the ‘scope (may be monitoring the wrong line – have just posted a request for RTSI pinouts for this DSA) and am wondering under what circumstances is the clock present on the RTSI bus.
My real problem is that MATLAB R14SP3 does not yet support a master card in a synchronization application but, oddly enough, seems to allow one to setup slave cards. I would like to continue using the MATLAB data acquisition toolbox to manage the DSA cards and the application and would rather avoid using calls the DAQmx dll library. (It's not clear how to integrate the functionality of the data acquisition toolbox with direct calls to the DAQmx library.) So I am looking for a workaround to get the clock signal on the RTSI bus so that I may try out the slaves.
Thanks,
Sebulba

Hi
Both ports of a two port CAN board are handled by one processor and they use the same memory for alocating the necessary queues.
But, both ports if connected to different CAN buses have their own handle, own queues and error handling. That means if one Bus enters to BUS OFF, the second bus can still communicate. And you can stop and restart communication independently on both ports. Even the ncaction reset works on a single port at a time.
DirkW

Similar Messages

Created a new folder in bookmarks; when try to add new bookmark, new folder does not appear in drop down menu; using safari for windows

created a new folder in bookmarks; when try to add new bookmark, new folder does not appear in drop down menu; using safari for windows

You are using an older version of firefox, upgrade your browser to Firefox 8 and try
* getfirefox.com

Generated Pulse waveform is distorted when I deliver the signal to the output port in the DAQmx

Problem: Generated Pulse waveform is distorted when I deliver the signal to the output port in the DAQmx.
Environment: Windows XP sp3 (32bit), Visual Studio 2010 sp1, NI-Measurement Studio 2010
Device: NI - DAQmx PCI 6251
 Analog Input: 1.00MS/s multi-channel (aggregate)
 Analog Output: 2 Channel 2.00MS/s
Reference Example: AO_ContGenVoltageWfm_IntClk / AI_ContAcqVoltageSamples_IntClk
Generated Pulse:
1) AO0 = Square Waveform /0-5V / 8KHz / 0.5㎲/sample / sample 50% Duty
2) AO1 = Square Waveform /0-5V / 8KHz / 0.5㎲/sample / (Reverse Image)
Description: I’d like to deliver the waveform stream satisfied with specified constraints to the 2 channel output port in the DAQmx. To verify accuracy of the generated waveform, I did an electrical wiring from the Analog output channel (2 channels) to the Analog Input channel (2 channels) in DAQmx. As a result of this experiment, I could get a result which has signal distortion. Since the waveform has to satisfy with both high frequency (8KHz) and very short moment interval time (△t = 0.5㎲/sample) between samples, I cannot handle some parameters of the function in the referenced VC++ example. Following formulas shows an approach to deliver the generate pulse waveform to output port satisfied with constraints.
Analog Output Channel
Frequency = 8,000 cycles/sec (constraint)
Sample per Buffer = 2,000,000 = 2*106 samples/buffer
Cycles per Buffer = 80,000 cycles/buffer
Sample per Channel = 1,000,000 = 1*106 samples/channel
 Sample Rate = Frequency * (Sample per Buffer / Cycle per Buffer)
                          = 8,000 * (2*106 / 80,000) = 2*106 samples / sec
 △t = 1 sec / 2*106 samples / sec
           = 0.5 * 10-6 sec/sample (constraint)
 Buffer Cycle = Sample Rate / Sample per Channel
                          = (2*106 samples / sec) / (1*106 samples/channel)
                          = 2 channel / sec
Analog Input Channel
Sample per Channel = 1,000,000 = 1*106 samples/channel
 Sample Rate = 1 MS/s * (2 Channel) = 5 * 105 Samples / Sec
Program Code
AO_ContGenVoltageWfm_IntClk / AI_ContAcqVoltageSamples_IntClk (VC++ Example)
Result: The proposed approach was implemented in the experiment environment (VS2010, MStudio2010). As shown in Figure 1, we could get the unsatisfied result. Although I intended to make a ‘square’ pulse wave, the result looks like ‘trapezoid’ pulse wave (Figure.1). However, there is other result which was undertaken with different parameter condition. It looks like the square shape not the trapezoid shape.
Please let me know what the conditions make the problem of signal distortion. (AO0 = Green line / AO1 = Red line)
[Figure. 1] Frequency 8000 Hz / Cycle per Buffer = 8000 Result
[Figure. 2] Frequency 1000 Hz / Cycle per Buffer = 1000 Result
Questions: Please let me know following questions.
1) Is it possible to deliver the generated pulse wave satisfied with constraints (f= 8KHz), △t = 0.5㎲/sample) to the output port without distortion using PXI 6251?
(Is it possible to solve the problem, if I use the LabView or MAX?)
2) Are there some mistakes in the proposed approach? (H/W or S/W program)
3) What is the meaning of the Cycle per Buffer?, It could effect to the result?

Hi Brett Burger,
Thanks for your reply. For your information, I have set the sampling rate as 10000 as for the sound format, I have set the bits per sample as 16 bit, the rate as 11025 and the sound quality as mono. I tried using your method by changing the sampling rate as 8K but still my program encounter the same problem.
I wish to also create a button that is able to generate a preformatted report that contains VI documentation, data the VI returns, and report properties, such as the author, company, and number of pages only when I click on the button.  I have created this in my program, but I am not sure why is it not working. Can you help troubleshoot my program. Or do you have any samples to provide me. Hope to hear from you soon.
Many thanks.
Regards,
min
Attachments:
Heart Sounds1.vi ‏971 KB

When does the App store appear?

What's the first version of the operating system to offer the App store?

10.6.6 and 10.6.7 contained buggy beta releases of the Mac App Store. The official Mac App Store was release to the public in 10.6.8.

How does one control the appearance of a web browser using Flash Builder?

Using Flash Builder I wish to record the existing appearance of a web browser (e.g. position, size, menubar, caption bar, status bar) and change it to full screen, no caption, no menubar, no status bar, etc. In this mode I will load a full screen graphic and other content in the browser and I want the user to not realize that everything is being displayed in a browser. Later I need to return it to the initial appearance using the recorded settings. Any guidance is appreciated.

It appears that one must launch a new a new browser using JavaScript from Flash Builder whereby many, but not all of the properties I detailed, can be set. Many browsers disable or can be configured to disable JavaScript from setting some of the properties. Launching a new window in the 1st place is disabled in many browsers.

Does seagate back up still back up if I use icloud for contacts & calendar?

will my back up hard drive back up contact and calendar using iCloud on mac bk pro?

Yes you need to maintain a local backup in addition to what goes on the cloud. To be 100% safe you should continue to back up your calendar and contacts locally in addition to using iCloud. Multiple backups are always better than relying on just one source. iCloud may go off line one day when you need something or something similarly strange could happen. Better to be safe than sorry.
Skydrive does have a Mac client so he could get those items from Windows onto Skydrive and then download them to the Mac. That would be using the cloud, so yes he could do that. See https://apps.live.com/skydrive/app/f644a8ef-9f98-4d1b-a3d2-eab969b0fd44 for more information.

HD won't appear on Desktop and cannot use Find for HD searches

The HD icon disappeared from my Desktop last week and I cannot get it back using Finder Preferences. Also when I search with Find it cannot see anything on the HD although all applications etc are there and can be used. External HD icon and CDs etc. show up on desktop. Tried Disk Utility first Aid but still nothing. Other "dummy accounts" have same problem. Any ideas??? I'm stumped.
iMac Power PC G3 Mac OS X (10.3.9) 768 MB SD RAM 500 MHz
iMac Power PC G3 Mac OS X (10.3.9) 768 MB SD RAM 500 MHz

due to hidden files which were deleted and all ok after that

Does firefox offer a text only of low data use browser for 3g usage

I have a netbook and want to be economical in data with a 3g data plan. Does firefox have a means of lowering wireless data usage perhaps with low res graphics and text coming from websites?

Something like supplying low resolution images and the caching of the full resolution images ''(for call-up at will)'' is usually a service provided by the ISP; on dial-up land-line services it's called a "web accelerator" plugin and service. Check with your wireless company to see if they offer a feature like that for Firefox.
Take a look at the Image Block extension and see if that will be helpful to you. That's about all I can think of to do through Firefox.
https://addons.mozilla.org/en-US/firefox/addon/5613/

Why does iPhoto always open/appear at launch?

Why does iPhoto always open/appear at launch? Someone used my computer under another account, and now my preferences seem to be changed. How do I fix it so iPhoto must me opened manually?

Some possibilities:
Right click on the iPhoto icon in the Dock. Is Open at Log In Selected?
Check your System Preferences -> Accounts -> Log In Items
Is there a camera or anything that your Mac might think is a camera (flash drive, USB Hard Disk formatted to a FAT format, phone) attached to your Mac. If so, disconnect it. If you don't want to disconnect it, set iPhoto to "Do Nothing" when a camera is attached. You do this in the iPhoto Preferences.
-- Have you tried each one?
LN

When does Date Modified field update in cmc XI3.1

In CMC > users and groups
there is a Date Modified field, When does it update? Is there any document describe that?
For example
I have test that when I edit a user's properties the Date Modified fields update.
When a user log onto CMC, some time the logon times is update as Date Modified
some times is not? Why does this happen?

Hello,
If you update the the properties of the group or the user then the last modified date will change to the current date/time. What kind of user do you have, Enterprise, Windows NT, Windows Active Directory or LDAP. Sometimes a user doesn't exist until they actually log on to the CMS then their Last Modified date would change. Have you consistantly seen this happen with a specific user, if so can you reproduce this on demand.
Jorge

How to pass header to a jsp when doing response.sendRedirect

Hi,
It is possible to pass header to a jsp when doing response.sendRedirect ? how to do it?
thanks

Thanks Luis for your suggestion but it doesn't work in my case.
in my implementation, user logs in from Novell iChain single sign-on. My initial jsp page gets the user information from request header, then should pass the user information to next page via my JSF servlet.
How this can be done ?

Hiding files when doing a search

I want to be able to HIDE some files if someone were to search for something specific. I know about the command-I on a folder and then selecting "no access" under "sharing and permissions" - but even with a folder under that designation, you can still see the files in it when doing a search. Not Good! This never used to happen in previous OS versions. Any way to TOTALLY lock down a folder so the only way to ever see what's in it is if you had the user/pass to get in?

b4scotty,
If you wish to password protect files/folders, I recommend using the Encrypted Disk Image feature of Mac OS X.
"By default, the password is stored in your login keychain when you create an encrypted disk image."
If you want total control of this disk image, "Do Not" add the password to keychain. That way a password must be entered every time that you attempt to open the Disk Image. Just be sure to remember the password or your data will be reduced to a jumble of 1's and 0's forever.
;~)

Is oracle 9i is still supported, when does it end?

Is oracle 9i is still supported, when does it end?
TIA

Well, tomorrow (31th) is the last day for 9.2, hope you planned well ;-)
Please see the Lifetime support policy document.
Note that you can hang on another year, if you are on 9.2.0.8.
"For supported customers, the Extended Support fee for Oracle9i Database Release 9.2 has been waived for the period August 1, 2007 to July 31, 2008. During this period, you will receive access to generally available fixes and critical patch updates (CPUs) at no additional cost other than your fees for Software Update License & Support (or any successor technical support offering to Software Update License & Support). Effective August 1, 2007, fixes and CPUs will be created against Oracle Database version 9.2.0.8 only."
Be sure to read the 9.2 Waiver of first year Extended Support FAQ

When does IOS 7 come out? And what model iPhones can download it?

When does IOS 7 come out and what iPhones is it available for?

Those questions can be answered by going to http://www.apple.com

Labview FPGA 2012 - Clock Signal

I'm trying to access the FPGA clock signal in Labview 2012. I have a NI PCIe-7852R card, with which I'm using the 40MHz onboard clock signal. I'd like to use that signal to clock some logic in my design, but there seems to be no easy way to access it - or, at least, the "clock signal" component has its own data type which only connects to a timed loop (the logic in question is in the form of a VHDL black box, which requires multiple clock rates; therefore since the IP integration node only allows one signal to be tied to the clock I need others as well, which will be fractions of the onboard clock). Any advice?

I use a SCTL running @ 20MHz to generate a 10MHz clock.
All you need is a SCTL with an Invertor on the IO Line and shift registers to hold the last state of the IO.
Each time the SCTL runs the IO is inverted and output. You should be a 50% Duty Cycle Clock.
Visualize the Solution
CLA
LabVIEW, LabVIEW FPGA

When does a clock signal appear on a RTSI bus using DAQmx for a PCI NI-4472 DSA?

Similar Messages

Maybe you are looking for