PXIe Bandwidth for FPGA

November 14, 2019, 11:30 pm

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Hi,

I am testing the peer to peer stream bandwidth of PXIe-1082 by using Labview 2018 with an FPGA FlexRIO system. According to Labview 2018 help(https://zone.ni.com/reference/en-XX/help/371599P-01/lvfpgahelp/fpga_creating_fifos/), I use PXIe-5785 as writer and PXIe-7976R as reader, representation is I16 and write eight data to FIFO each time.

 

From the PXIe-1082's User Manual, 1082 has 2 GB/s per slot dedicated bandwidth. And according to the introduction of peer to peer streaming(http://www.ni.com/product-documentation/10801/zht/), if modules which connect to the same PXIe switch, the streaming path will through the switch only and the modules seems connect to the switch by a x4 PCI Express link. So I plug 5785 and 7976 into slot 3,4 (same switch) and expect bandwidth reach 2 GB/s.

 

However, it only reach about 902 MB/s. Does any chassis backplane setting missing or PXIe switch limitation reaching? Moreover, the bandwidth reduce to about 743 MB/s if I change to slot 2 and 4. But  they seemed both stream through x4 PCI Express link. What is difference of them?

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PXI 2529 NI Switch Topology

November 15, 2019, 8:04 am

≫ Next: Controller P2P bandwidth

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In Testand I initialize in the setup the DMM then I would like to initiate NI switch. I always get the error code 1074118655 and the detail says: niSwitch Initialize With Options.viAnother process has already opened a session to this switch module. I tried to change the topology but without success. How can I test the DMM and NI switch with each other? I want to use the multimeter and NISwitch in one step during the test procedure.

Controller P2P bandwidth

November 17, 2019, 10:43 pm

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Hi all,

I tried to measure the peer to peer streaming rate of PXIe-1088 by using FPGA system with Labview 2018.

I use PXIe-5785 as writer, PXIe-7976 as reader, representation is I16 and write 8 data into FIFO each time.

According to 1088 manual, slot 4,6,8 should has 2 GB/s bandwidth so I plug 5785 into slot 4, 7976 into slot 6. From the backplane of 1088,

P2P streaming path would go through the PCIe switch in controller. Then I choose PXIe-8133 as controller.

From NI ocumentation(http://www.ni.com/product-documentation/10801/en/), maximum rate between switches of 8133 is 1.6 GB/s, maximum peer-to-peer rate of 7976 and 5785 are 3.2 GB/s and 7 GB/s.

But it only reach about 902 MB/s. Are there anything I missing or wrong?

 

Moreover, I change controller to 8880, the streaming rate increase to about 1.4 GB/s.

It seems the PCIe switch in the 8133 limits the streaming rate but maximum rate between switches of 8133 is 1.6 GB/s. Is any setting I missing?

 

By the way, where can I find the maximum rate between switches of 8880? I do not find in document and 8880 user's manual.

 

PXI CONNECTOR

November 17, 2019, 11:51 pm

≫ Next: PXIe-7975 FlexRIO Adapter Module Current Draw

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What's the difference between NI 6555 and NI 6542 pxi connector ? how to choose?

PXIe-7975 FlexRIO Adapter Module Current Draw

November 19, 2019, 2:45 am

≫ Next: PXI-6723 error code: 50400 in MAX

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Hi All,

I am currently designing a FlexRIO adapter module for a PXIe-7975 and need to know how much current I can draw from the +3.3V and +12V pins on the edge connector, however I can not find any documentation providing such information, can anyone help? Sorry if I am missing something obvious 😄

 

Thanks in advance.

PXI-6723 error code: 50400 in MAX

November 22, 2019, 8:43 am

≫ Next: working with the same session of a DMM 4065 in the whole python code with different methods...

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Hi,

 

I am having trouble with the PXI-6723 card in MAX. It was in a hybrid slot of PXIe-1073 Chassis, which was installed by factory before shipment. I can find the card on device manager and MAX. But when I try to self-test/reset the card, this Error Code-50400 shows up. I tried to reboot the PC and controller, re-install the NI-Daqmx, neither of them work.

 

Could anyone please give me some help how to fix this problem?

 

Thanks!

Xin

working with the same session of a DMM 4065 in the whole python code with different methods...

November 26, 2019, 2:06 am

≫ Next: Amount of DAQmx channels

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Hello everybody,

I would like to have your help about how can we use lock() (NI modular Python API) to work with the same session of a DMM 4065 in the whole python code with different methods...

I do create a python method that configurates the DMM (resolution, range, autozero, triggering....), then i use a method that calls a external signal coming from an AO of a  Daqmx for trrigering DMM, and then i call a method which allows me to fetch data from DMM's buffer.

When executing this code, i have this error: 

nidmm.errors.DriverError: -1074118641: The data is not available. This can be caused by calling Fetch or FetchMultiPoint before calling Initiate or after calling Abort.

Knowing that if i do all that in the same method (the same session) it works...

Than you in advance.

 

Amount of DAQmx channels

November 26, 2019, 3:15 am

≫ Next: Software intalled, indentified MAX, cannot find PXI-7813R in the project

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hello everyone,

 

I have a channel selector and can select multiple channels. The datatype of this control is 'DAQmx- physical channel'. Is there a property node for the amount of channels select?

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Software intalled, indentified MAX, cannot find PXI-7813R in the project

November 26, 2019, 6:27 pm

≫ Next: How to connect PXIe-5162 by Matlab?

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Hi,

 

I'm having a small problem with adding the FPGA target.

I think the software is installed, versions are matched, and the connection has no problem, MAX even shows nice detection of the devices. But I just cannot find the FPGA target in the project tree. Even though I look for just new target (not automatic searching), I still don't see PXI-7813R but I do see some other PXI R series.

Is there something I can do at this moment? Thanks in advance,

 

loorex07

How to connect PXIe-5162 by Matlab?

December 1, 2019, 10:17 pm

≫ Next: test post

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Hi,

I try to control my NI PXIE-5162 using the Ni Scope and Matlab Instrument Control Toolbox. Ni Scope can connect it. But Matlab cannot connect it. After conducting the command 'connect(ictObj) ' , there is an error:

                        

The whole commands are:

                         

However, Matlab's Test & Measurement Tool can support PXIe-5162, as follows:

But on Matlab website, there is no PXIe-5162 in Hardware Support, as follow.

How can I connect the device? Are there any command sets that can be used to control PXIe-5162 by Matlab?

Thank you.

test post

December 2, 2019, 11:39 am

≫ Next: PXIe-4300 for Single ended measuerment

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This is just a test message

PXIe-4300 for Single ended measuerment

December 3, 2019, 2:40 pm

≫ Next: Accelerometers and cDAQ manipulation

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Hi All,

 

I have one question regarding PXIe-4300 to use it as single ended measurement.

is it possible to use it as 16 channels single ended???  

Accelerometers and cDAQ manipulation

December 4, 2019, 11:07 am

≫ Next: anti-aliasing filter calculation

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Hello,

 

I have a question regarding accelerometers interfacing with the compact DAQ system. If I'm using two triaxial accelerometers along with two 9234 modules, can I take one input (let's say the z-axis) and plug it into one module and take the other two inputs (x and y) and plug them into a different 9234 module? My first three inputs of the 9234 are already taken up by a different triaxial accelerometer, but I don't want to waste the fourth input and simply not use it. Let me know if this is feasible. 

 

Thanks.

anti-aliasing filter calculation

December 5, 2019, 5:28 am

≫ Next: PXI 2597

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Hello,

I would like to connect instrumentational amplifier to one of the analog inputs (in RSE mode) of the PXI-6259 DAQ. Im wondering how to optimally choose values for Rf and Cf of an anti-aliasing filter? Required -3dB frequency for the filter is given. 

Here https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019Nw5SAE&l=en-US
it is stated that PXI-6259 has A/D converter of SAR type, but no values for sample and hold circuit (Chs and Rsh) are provided there as well as in the 6259 device specs or M series User manual. Sketch of my setup is attached. Would be helpful to hear your experience regarding the creteria I should use for the filter component selection!

 

Greetings,

Mikhail

PXI 2597

December 5, 2019, 5:06 am

≫ Next: Transmit signal from PXIe-6341 to PXIe-7962R

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Hello everyone,

 

I am currently using PXI - 2597 with Labwindows CVI, but I could not find the driver of the switch. 

 

Could you help me?

 

Thanks a lot.

 

Best regards.

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Transmit signal from PXIe-6341 to PXIe-7962R

December 5, 2019, 2:48 pm

≫ Next: PXIe-6363 Multifunction DAQ Card Not Showing Up in NI-MAX

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I am designing a scanning image system. PXIe-6341 and PXIe-7962R are on PXIe-1073. PXIe-6341 is used to collect the trigger signal from pin AI0; PXIe-7962R is responsible for processing image data. However, I do not know how to transmit trigger data from PXIe-6341 to PXIe-7962R. I cannot use PXI_Trig0 in FPGA correctly. 

I think it is an easy question, but I really cannot find a suitable manual on NI website. 

Are there some demo can illustrate the way to transmit signal from PXIe-6341 to PXIe-7962R?

PXIe-6363 Multifunction DAQ Card Not Showing Up in NI-MAX

December 9, 2019, 4:58 pm

≫ Next: PXI-1044 Causing PC Failure

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I have installed a PXIe-6363 module in a PXIe-1078 chassis with a PXIe-8821 control module. I have also installed various other modules. I see all the other modules when I look at the PXIe chassis in NI-MAX (V 19.0), but I do not see the 6363. If I move another module into the slot where the 6363 was, I see it. If I install the 6363 into a different PXIe chassis, I see it.

 

Any thoughts as to what could be going wrong?

 

Thanks.

 

 

PXI-1044 Causing PC Failure

December 10, 2019, 10:47 am

≫ Next: NIdigital waveform generator/analyzer

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Hello everyone,

 

Problem;

I am experiencing an issue with one of my PXI-1044 chassis. Upon startup with this the PXI chassis on, when trying to boot the computer the computer fails to start but instead sends out a series of beeps indicating the BIOS battery or motherboard is be bad.

 

Configuration;

My current configuration consists of a PC running window 10 connected to the PXI-1044 chassis via a MIXI-4 controller.

 

Troubleshooting;

After disconnecting the MIXI-4 connection at the PXI chassis the PC works as expected, other then something changing the boot manager configuration. I started troubleshooting by first moving the MIXI to a different PCI slot in the computer but still no change. I then used one of my spare MIXI-4 PXI cards in the chassis but still had the same issue. I have also changed the computers Link State Power Management setting to off with still no change. I connected the PC with the same MIXI-4 PCI card to a spare PXI-1044 chassis and the issue was resolved. This troubleshooting leads me to believe that the chassis itself is having an issue.

 

Question;

Has anyone experienced this sort of problem before and if so what was the resolution?

 

Thanks

NIdigital waveform generator/analyzer

December 10, 2019, 9:47 pm

≫ Next: PXI 6555 / PXI 6542

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We are planning to use NI 6555 and NI 6542 ,for performing dynamic acquisition and dynamic generation with our customized board. what type of interfacing cable we can select for this , what are the parameters we have to consider before selecting one. how much the cable cost will be approx.

PXI 6555 / PXI 6542

December 10, 2019, 10:33 pm

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We are designing a custom board to interface with "NI PXI -6555 /6542". I am using the connector HDRA-EC68LFDT2 to interface with NI modules. Kindly confirm if this is acceptable and also suggest the cable required for interfacing between PXI(6555 /6542) & our board.It would be appreciated if you provide the required cable part number for procurement.& provide the required cable part number for procurement