About PXI-8423.

In the datasheet of PXI-842x, it was been mentioned that the transfer rates of RS-485 is 460kbps. What I want to ask is that this performance character is defined by which cable length? Does it mean that by using 1200ft cable the 485 module can meet 460kbps?
Or the maximum transfer rate is 460kbps, no matter how long the cable is?

The max rate is indeed 460.8k, as determined by the baud clock of the UART. Cable capacitance plays the largest role in limiting data rates, and different cables will have different capacitance. However, you should be able to go up to 500m (maybe even 1000m) at 460.8k with the PXI-842x RS-485 interface cards and typical RS-485 cables.

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I need some information about pxi-843X

Good afternoon!
my teacher requiered me knowing a lot software code about PXI-8430/2,PXI-8431/4without the hardware,so i am angry,would anybody help me?I am waiting........

Hope i did not make you more angry
These are rs 232and rs 485 serial communication devices
Read this link for an overview and start going to subsequent links from that page.
Also this link may help
and if you plan to code in LabVIEW, go to find examples and execute a search for rs 232 and rs 484 example vi's
any doubts, do ask
Message Edited by devchander on 09-19-2006 11:24 PM
Message Edited by devchander on 09-19-2006 11:25 PM

About PXI-6220 PXI-6221

We want to use PXI-6220 or PXI-6221 to design a system. And we will use the CVI or Labview, but we cannot find the PROGRAMMING MANUALS of PXI-6220 or PXI-6221.Where can I get them? Thanks!

Hi wenyan,
You can program both the PXI-6220 and the PXI-6221 using the NI-DAQmx driver. The following tutorial is a very helpful:
Learn 10 Functions in NI-DAQmx and Solve 80% of Data Acquisition Applications
Also, both LabVIEW and CVI come with various data acquisition shipping examples (Help >> Find Examples). I suggest using those as starting points.
If you've installed the DAQmx driver, you should be able to find DAQmx Help from (assuming you're using WindowsXP) Start>>Programs>>National Instruments>>NI-DAQ
More information on the DAQmx functions can be found:
NI-DAQmx Help (User Manual)
Hope this helps,
Lesley Y.

Questions about PXI-6624 signal connections of outputs

Attachments:
6624.JPG ‏34 KB

I just got off the phone with NI support, so no worries on the answers.
Short versions:
The unique ID's are regenerated when a sequence is copied.
Teststand doesn't need higher versions uninstalled to reinstall an earlier copy.
Connector Pane Checksum implies a different underlying VI, but having the same connector geometry/inputs/outputs/types should allow you to have a different VI for different installations without different sequence files.
Still waiting to hear back from support on whether the goto pointers get updated properly when a sequence or portion of a sequence is copied.

Triggerring PXI-4110 to measure 1 current value while HSDIO PXI-6552 generating waveform

Hi,
Some question about PXI-4110 to measure current while PXI-6552 is generating the waveform.
1. Let say, I need to measure 3 points of current values, i.e. while PXI-6552 is generating sample-1000, 2000 and 3500. On the edge of sample 1000,2000 and 3500, the PXI-6552 will send a pulse via PFI line or via PXI backplane trigger line. My question is, is it possible to trigger PXI-4110 (hardware trigger or software trigger) to measure current values at these points ?
2. Let say I need to measure the current on 0ms (start of waveform generation by PXI-6552) , 1ms, 2ms, 3ms, 4ms... and so on for 1000 points of measurement, code diagram as shown at the figure below. It is possible for the VI "niDCPower Measure Multiple" to measure exactly at 1ms, 2ms, 3ms .. ? How much time will have to spend to complete acquire 1 point of measurement by "niDCPower Measure Multiple" ?
Thanks for viewing this post. Your advice on hardware used or software method is much appreciated. Thanks in advance.
Message Edited by engwei on 02-02-2009 04:24 AM
Attachments:
[email protected] ‏46 KB

Hi engwei,
1. Unfortunately, the 4110 does not support hardware triggering. Therefore you cannot implement direct triggering through the backplane or anything like that. However, there are a couple of possible workarounds you can try:
a) Use software triggering: Say your 6552 is generating in one while loop, and your 4110 is to measure in another while loop. You can use a software syncrhonization method like notifiers to send a notification to your 4110 loop when your 6552 has generated the desired sample. This method, however, will not be very deterministic because the delay between the trigger and the response depends on your processor speed and load. Therefore, if you have other applications running in the background (like antivirus) it will increase the delay.
b) Use hardware triggering on another device: If you have another device that supports hardware triggering (like maybe an M-series multifunction DAQ module), you can configure this device to be triggered by a signal from the 6552, perform a very quick task (like a very short finite acquisition) then immediately execute the DCPower VI to perform the measurement. The trigger can be configured to be re-triggerable for multiple usage. This will most likely have a smaller time delay then the first option, but there will still be a delay (the time it takes to perform the short finite acquisiton on the M-series). Please refer to the attached screenshot for an idea of how to implement this.
2. To make your 4110 measure at specific time intervals, you can use one of the methods discussed above. As for how long it will take to acquire 1 measurement point, you may find this link helpful: http://zone.ni.com/devzone/cda/tut/p/id/7034
This article is meant for the PXI-4130 but the 4110 has the same maximum sampling rate (3 kHz) and so the section discussing the speed should apply for both devices.
Under the Software Measurement Rate section, it is stated that the default behavior of the VI is to take an average of 10 samples. This corresponds to a maximum sampling rate of 300 samples/second. However, if you configure it to not do averaging (take only 1 sample) then the maximum rate of 3000 samples/second can be achieved.
It is also important to note that your program can only achieve this maximum sampling rate if your software loop takes less time to execute than the actual physical sampling. For example, if you want to sample at 3000 samples/second, that means that taking one sample takes 1/3000 seconds or 333 microseconds. If you software execution time is less than 333 microseconds, then you can achieve this maximum rate (because the speed is limited by the hardware, not the software). However, if your software takes more than 333 microseconds to execute, then the software loop time will define the maximum sampling rate you can get, which will be lower than 3000 samples/second.
I hope this answers your question.
Best regards,
Vern Yew
Applications Engineer, NI ASEAN
Best regards,
Vern Yew
Applications Engineer
Attachments:
untitled.JPG ‏18 KB

PXI System does not appear in MAX 4.0

Hello,
My system comprises LabVIEW RT 7.0, target PXI-8176 controller in PXI-1000B chassis, PXI-6608, PXI-6711, NI-4472, PXI-6704, PXI-6527, PXI-8423/4, PXI-8422/4. This has been stable for two years. I recently solved an RS-485 2-wire mode configuration problem, using information in a discussion forum thread, by upgrading to NI-VISA 3.4.1 and NI-Serial 2.5.5. MAX 4.0 was installed as part of this process. Everything seemed to work fine. I instructed a distant customer to do the same, but they experienced some difficulty. To ensure we were working from the same starting point, I re-initialized my PXI system, using PXI Format Hard Drive Disk, version 7.0, from MAX 4.0. I configured TCP IP address, and re-installed the RT software on the PXI controller.
Next, I attempted to configure the PXI controller and chassis, in MAX, to update the pxisys.ini file, but the PXI System (Unidentified) does not appear under Remote System>>IP address>>Devices and Interfaces. Similarly for the serial ports. This worked before, but I cannot get this back. What is wrong?
Best regards,
RonC

Hello S. Bassett
The controller is definitely booting in RT mode -- I can still run my applications on the RT target. VISA seems configured properly also, I can make VISA calls without error in the application.
In fact, the RT system seems to work correctly, and I contemplated leaving it as it is. However, the fact that MAX does not recognize the PXI system makes me nervous, and I cannot do some of the things I may want to do, for example independently configure RS-485 port wire mode in MAX (the ports do not show up either). Traditional DAQ configuration in MAX works.
After your last post, I found a brief reference in MAX Help that indicated "PXI Services" had to be downloaded before the chassis could be configured. But there are no other mentions of what PXI Services is, what it does, or how to install them. PXI Services does not show up as RT Software in MAX. In the Windows Add/Remove Programs control panel in Windows, in the National Instruments software section, there are two apparently related entries:
- NI PXI Platform Services for LabVIEW Real-Time 1.5.1
- NI PXI Platform Services for Windows 1.5.1
But, I cannot get these to install on the RT target. Not knowing what was causing the problem, I uninstalled everything from National Instruments, deleted all folders, and reformatted the PXI platform. There was one problem during this process -- after uninstalling NI-Serial 2.5.5, it does not get removed from the Add/Remove programs control panel. There is still a registry key that the uninstaller did not remove -- presumably this is the problem.
I have rebuilt everything, but could not get NI-Serial to install -- the installer thinks there is a newer installed on the RT target (there isn't) and refuses to install NI-Serial 2.5.5. So right now, I cannot install NI-SERIAL (any version), or remove the 'existing' NI_SERIAL, because it isn't actually there, and there is no uninstaller.
Otherwise, everything seems to be back to where it was before I "upgraded" to NI-VISA 3.4.1. This was NI-VISA 3.0, LV RT 7.0, and MAX 3.0.2. I have not yet been able to install NI-Serial, so I cannot yet see if I have also restored my original problem -- the one that led me to have to upgrade NI-VISA and NI-SERIAL in the first place.
Most importantly, there is now a "PXI Services v1.1.2" installed on the RT target. I am quite sure the problem with MAX 4.0 not recognizing my PXI system has to do with the absence of this driver on the RT target.
Thanks again for your interest and help,
RonC

Release date for PXIe Modules

I had a couple of questions about PXIe:
1) I see that a controller and chassis have been released, when will Digitizers and DAQ cards be released?
2) It is my understanding that a PXI card that is plugged into the PXIe
chassis will work, but NOT receive the 1GB/s bandwidth, is this
true? In other words, PXI cards do not get the bandwidth upgrade,
just PXIe cards.
3) I saw in the PXIe tutorial that PXI cards can be sent in and the J2
pin port will be replaced to make it into a PXIe hybrid card.
Would this card gain the benefit of the 1GB/s bus speed?
Thank you in advance,
Austin McElroy

I'll answer your last two questions:
>>It is my understanding that a PXI card that is plugged into the PXIe
chassis will work, but NOT receive the 1GB/s bandwidth, is this
true? In other words, PXI cards do not get the bandwidth upgrade,
just PXIe cards.
There are different types of slots in PXI Express chassis. A PXI card can be plugged into a hybrid slot or a PXI slot. A PXI slot can only accept a PXI card. A hybrid slot can accept a PXI card or a PXI Express card. In order to insert a PXI card into a hybrid slot, it must have the J2 connector replaced as you stated. Some PXI cards do not have a J2 connector and these need no modification.
PXI and PXI Express cards use different types of busses to connect to the system. PXI cards use only the PXI (PCI) bus while PXI Express cards use a PCI Express link. Electrically, the two busses are not compatible or interchangeable. Hybrid slots support both busses, but a card only uses one or the other. The bandwidth available to a PXI card does not increase if it is plugged into a hybrid slot as the PXI card will only use the PXI bus, not the PXI Express bus.
>>I saw in the PXIe tutorial that PXI cards can be sent in and the J2
pin port will be replaced to make it into a PXIe hybrid card.
Would this card gain the benefit of the 1GB/s bus speed?
No, this card still connects using the PXI (PCI) bus. The PXI Express bus in the hybrid slot will not be connected to the PXI card. The PXI card will not be able to access the bandwidth provided by the PXI Express bus.
This is a subtle point, but a PXI card that has been modified to work in a PXI Express hybrid slot is known as a "hybrid slot-compatible PXI module". A "PXIe hybrid card" seems to imply a card that uses both the PXI Express and PXI busses. I doubt such a card would ever be designed.

Direct Streaming of data from onboard memory to Host memory in PXI 5122

Hey All,
I have a small query about PXI 5122. In Data Sheet its written that " The PXI-5122 also can stream data continuously from onboard memory to host memory for longer acquisitions and streaming to disk. "
So do we have to write some code for streaming the data on hard disk or when drivers of this card is installed then some VI's will appear in control panel through which we can stream data on hard disk ??
I hope you all understood what my query is. Please let me know for further details
Thank you.
Regards,
Sarang Dhananjay Jaiswal
Satyam Development Center, Banglore, INDIA

hi sarang,
u have to write some code for streaming the data on hard disk,
for any applications using labview u need to do coding........
here is a vi which will do streaming of data on to hard disk
to know more about digitizers (C:\Program Files\National Instruments\LabVIEW 7.1\examples\instr\niScope\niScope EX Getting Started.vi)
or in labview goto
find examples \hardware input output \modular instruments\ NI-scope(high speed digitizers)
regards
ak
Attachments:
Stream data to Disk1.vi ‏172 KB

Erratic behaviour/results using DAQmx

Hi!,
One of our PXI based automation systems is not working as expected.
The errors we are observing:
1) Timed while loop hangs and is unable to read the clock source. The clock source is TTL pulse train coming from encoder and fed to Counter 0. When we reset the loop (or force a timeout) it continues to read the pulse correctly. The vi used for this test is attached. We tested with a hardware counter running in parallel to ensure pulse availability.
2) Wrong readings of various digital I/O. For e.g. even when a proxy is in OFF state, the software reads it as ON
3) MAX (version 3.1) got corrupted and we had to repair the same.
Pointers:
1) The above mentioned errors occur at random. There is no pattern or frequency of occurance.
2) When the hardware was first shipped to us, the controller showed erratic behaviour (while booting) which seemingly resolved when we changed the onboard BIOS battery.
3) Do you think reinstalling the OS will help? We have already uninstalled and reinstalled NI-DAQmx 7.2 without any success.
4) We have Service Pack 4 and IE 6.0 (for Win2K) installed. Are there any known issues with SP4 and IE 6.0?
System Specs:
OS is Win2000 Professional.
Development environment is LV 7.1
Chassis / PXI-1031
Controller / PXI-8184
Multifunction / PXI-6025E
Serial / PXI-8423
Connector Boards / SCB-68 (two numbers)
Any help will be appreciated
- Gurdas
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu
Attachments:
TimeoutTesting_VI.zip ‏199 KB

Sean,
I have not tried the 100KHz timebase but what I did try yesterday was using the encoder pulses to simultaneously run a counter and trigger the time loop.
My VI for this is attached. Sequence 0 and 2 in my VI are used to powerup and powerdown the motors and can be excluded from our discussion.
I have inserted a note in the blockdiagram that explains VI results and behaviour.
To restate: The encoder pulses (at PFI8) were being edge counted by Counter 0 and simultaneously acting as source of timing for counter 1 which in turn was the tick for timeloop. What was observed is that while the time loop went into an infinite wait (if my timeout was -1) or continuous timeout (if say timeout was 50ms), counter 0 continued to successfully count encoder pulses.
This, to me, strongly points that either the timing source for the timeloop is failing to do its job OR the timeloop is failing to read the ticks coming from timing source OR both are failing to do their job.
What inference can draw from this?
I guess we can rule out encoder pulses to be the issue since counter 0 does not fail. Do you think something is wrong with my PXI-8184 controller? Is this a bug?
Eagerly awaiting some answers that can help me resolve this deadlock.
Thanks,
Gurdas
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu
Attachments:
Test_Counter_TimeLoop.zip ‏128 KB

Synchronise READ from Serial card when Counter on 6025 is incremented

Hi!
System description:
I am using PXI-8423 (2-port RS-422) and PXI-6025 to measure the signal coming from 2 laser sensors mounted onto a mechanical stage with linear encoder.
The laser sensors give RS-422 output (at 1KHz) and are connected to my serial card.
The encoder gives quadrature output that I plan to connect to counters on my 6025 daqcard.
Q:
I want to read the laser data everytime the encoder gives a pulse signifying the mechanical stage has moved. How can I achieve this?
We would be taking around 1000 serial reads (from each port) per second.
Environment:
We are using PXI-1031 chassis (4-slot) with PXI-8184 controller (850 MHz celeron). OS is Win2K prof. and LabVIEW 7.1
Thanks,
Gurdas
[email protected]
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu

Hi Gurdas,
We have some simple serial communication examples included in LabVIEW. Those example programs transmit any string of characters over the serial port. All you have to do is set which port you want to use, baud rate, stop bits, parity, etc. in the VI; this setting wil remain for each serial transfer while the program is running. Again, you can read/write any character string with the serial communication VI's. How the information is put into the character strings is up to you and the device you are communicating with. The serial communication is LSB before MSB.
Regards,
Salvador Santolucito
Applications Engineering
National Instruments
Attachments:
Basic_Serial_Write_and_Read.vi ‏66 KB
Advanced_Serial_Write_and_Read.vi ‏105 KB

RS 485 2 wire auto control echos back...

Hi all
Am using NI- PXI 8423 board with 4 RS485 com ports, i need to use the com port in 2 wire mode, if i use TXRDY Auto control mode of operation the receiver still recives what i just transmitted. how is this possible?, because the document says that the receiver is disabled when transmiting data. and how do i solve this problem?
Thanx for the reply
Arun

You might not have the proper VISA Server security settings. This would mean that you can change the properties in side the VI, but you wouldn't be able to change the in MAX. Open MAX, go-to Remote Systems, select your RT System, then Software and finally click on the NI-VISA 3.3 folder. Select the VISA Options tab on the bottom and then select the Security item under VISA Server. You will need to make sure that the IP of your host machine (the one you are doing this from) is located on this list. To add an IP address to the list Click Add, then type in the IP and then click in the blank area inside the box. You should then get the Save option at the top. Make sure you click save. In addition, you can use wild card characters to specify the IP. For example I add something like 12.3.55.* so any computer on my local subnet can access the device and I have noticed that my computer will sometimes change IP addresses.
One other thing that I would suggest is making sure you have the latest NI-Serial RT driver installed. This requires upgrading to at least NI-VISA 3.3 and then downloading the latest NI-Serial driver for RT which can be found at ftp://ftp.ni.com/support/ind_comm/serial/lvrt/. Copy the MSI file to your computer and run it. You will also need to install the new software to each RT Target. Note that currently the latest NI-Serial 2.5.5 will still display NI-Serial 2.5.4 on the monitor if you have one connected to your RT target.
I hope this helps out.
-Josh

Were are the PCI slots?.......

hai
Am new to national instrument products, i know that PXI stands for PCI eXtention and Instrumentation.
We received a PXI-1052 chassis and i was wondering "were are the PCI slots in it". I found some kind of male pins at the end of the slots to place the SCXI module. are those PCI bus which are redesigned?
am just curios
thanks for any reply
Arun

Arun,
You are indeed correct that PXI stands for PCI eXtensions for Instrumentation, as this name implies, PXI leverages PCI bus technology to take advantage of the high data rates and ease of use that the PCI bus offers.
While PXI offers the same PCI bus technology that can be found in a standard desktop computer, the interface to the bus is different. While a standard desktop computer utilizes flat PCI slots for plug-in hardware, PXI offers a more rugged Euro Card interface. To see the differences between the two, you can follow the link below to see a picture showing the two interfaces:
Interface Differences between PCI and PXI
In the case of your PXI-1052 chassis which combines both PX
I and SCXI slots in a single chassis, the smaller slots on the left-hand side (as you look at the chassis) will be the PXI slots. The SCXI slots are the slightly taller slots on the right-hand side of the chassis.
I hope that helps to answer your question. If you are interested in learning more about PXI, you can do so by reading a tutorial here at ni.com or by visiting the PXI Systems Alliance website (both linked below).
PXI Tutorial
PXI Systems Alliance Homepage
Please post a reply if you have any additional questions.
Regards,
Jed R.
Applications Engineer
National Instruments

AC current source

Hi
I need two AC current sources (20 to 200 Hz); what PXI system can I use ? (SMU ?)
thanks for help
ND

Hi,
Thank you for posting your question on National Instruments' forum.
I think the best way to find an answer to your question is to check the ressources on the NI website about PXI SMUs :
Unité de source et mesure de puissance NI PXI-4130 : http://sine.ni.com/nips/cds/view/p/lang/fr/nid/204239
And yes I think that, considering the information you gave, a SMU is certainly the best thing to buy in a PXI format to source a signal.
The best way to get additional information about which product you should buy is to contact your local NI commercial branch.
The sales people there will be the best suited persons to aswer your questions about which product to choose.
Best regards,
Guillaume H.
National Instruments France
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LabVIEW drivers for LMI Selcom

Hi!,
I am using SLS5100/200 from LMI Selcom, Sweden.
The laser sensor version I have has RS-422 output.
Does anyone have a suitable driver for this device?
I am using PXI-1031, PXI-8423, LV 7.1
Thanks,
Gurdas
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu

Hello,
I did not locate a driver at NI's instrument driver site (although there are many there), however, you may try contacting the manufacturer as they often have such drivers.
Have a great weekend!
JLS
Best,
JLS
Sixclear

Yaskawa Drives connected to UMI7764 and PXI-7334 Disable after staying idle for about 5 minutes

I have a setup in which I am using PXI-7334 4-Axis controller with UMI-7764 to control 4 Yaskawa SGDV drives. The system has been running fine for about a year now. Recently we started seeing a strange behavior where with the drives enabled if they were left idle (No Motion) all of the 4 drives will disable automatically. Not sure what could be causing this problem. Can anyone help me figure out where the problem could be or what should I look out for.
Thanks
Jigar

Hi Jigar,
What is the version of NI-motion that you are using as well as your operating system you are using? Did anything change with your setup around the time this behavior started occurring?
Something that would also be interested in testing is whether or not this behavior occurs when you have only one of the drives hooked up. Let me know what you find.
Paul M
National Instruments | Applications Engineer | www.ni.com/support

About PXI-8423.

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