Use of DAQ and BNC-2120

Hello there,
How can I use DAQ Assistance from labview to generate two different signal and output them from two analog output(AO1) and AO2 of BNC-2120? I tried but the DAQ fails.

A BNC-2120 is only a connector block. You can't do any analog input or output with it unless you connect it to a DAQ card. So what DAQ device to you have it connected to?
Don't say you tried to do something and it failed without show us what you tried and in what way it failed. Did it your LabVIEW program give an error message? Did it fail by showing a big flash and then giving off a lot of smoke?
Give some details, error messages, attach your LabVIEW VI.

Similar Messages

Where can I get a pin diagram for the BNC-2120 DAQ Boaard?

I am using a NI BNC-2120 DAQ Board and a couple of the pins seem to have been damaged. I was looking for a pin diagram to so that I can check to see what these pins correspond to and if they could be contributing to some of the unusual readings we are getting.

I'm assuming that the damaged pins you are referring to are on the back of the connector block where the cable plugs in.
The BNC-2120 Accessory is able to be used with several different families of data acquisition products, and therefore the meaning of the pins could possibly depend on which particular data acquisition device you are connecting to the BNC-2120.
You can find many of the generic pinouts for E series 68-pin devices in the DAQ-mx Help:
http://digital.ni.com/manuals.nsf/websearch/95ADFF85ABA7853986256D8800668AE2?opendocument
If you are using an M series device, the following lists its corresponding pinout, which is nearly identical:
http://digital.ni.com/public.nsf/allkb/61ED77983AD7CCA386256F66008215F1
If you let me know which device you are using and which pins you suspect are damaged, I could give you more information on what effect it might have.

Encoder Clk and Direction with BNC-2120 and 6251 M Series

I'm trying to measure the angular position using optical encoder connected to LS-7084. I have connected CLK to PFI3 on BNC-2120 and UP/DN to PFI4. I created two tasks using DAQmx. one task to get the direction and the other to get the counts. I have a problem with passing teh information from the first while loop to the count option on the second task. please advice. Thank You
Attachments:
Measure Angular Position V5.vi ‏100 KB

I don't have LV at my network PC and can't open your vi now, but can offer this:
There's a different method to configure your measurement with a single counter task so that the board's hardware accounts for the Direction bit. To measure a Clock and Dir type of incremental position signal, you actually do *not* configure the counter to measure encoder position. You configure it to count edges, and then use a DAQmx Channel property node to further specify that the count direction is controlled by the Dir signal found at PFI4. The right property is probably found several sub-menus deep in the property hierarchy.
It'll definitely be better to let the hardware deal with this for you than to try to manage the complexity of two simultaneous tasks.
-Kevin P.

Can I use a BNC-2120 with my AT-MIO-16L9

Hello
I am working here at the Colorado School of Mines and trying to figure out this small problem.
Can I use a BNC-2120 with my AT-MIO-16L9?
The BNC-2120 says it will work with E series, M series MIO boards but I am not sure what series mines is?
Any infor would be greatly appreicated
J

Hello J,
Now that's an older card! the BNC-2120 should work with the
AT-MIO-16L-9, you'll need a 50 pin to 68 pin connector, and you'll want
to verify that the signals are being routed to the proper
terminals. Here's the signal routing chart for reference.
Regards,
Micaela N
National Instruments

How can I use a GPIB and AT-MIO-16L with a common NI-DAQ?

I'm using a GPIB card for recording data and a AT-MIO-16L for sending an analog output to my instrument. Earlier, both the devices (GPIB and AT-MIO-16L) were running correctly. Until I reformated my hard disk. Now I'm trying to install NI-DAQ 6.1.1 for AT-MIO-16L but that doesn't detect my GPIB card. On the other hand if I use NI 488.2 along with MAX 1.7 or MAX 2.2, I'm unable to use AT-MIO-16L. Is there a way I could get both my devices running on a common platform?

NI-DAQ is not supposed to detect your GPIB and NI-488 software will not detect your daq board. When you installed MAX, was this from a LabVIEW driver install CD that also put a new version of NI-DAQ on your pc. Open MAX and check your currently installed versions of NI-DAQ and NI-488. They should both be listed. If you have a new version of NI-DAQ than 6.1, you can uninstall the newer version and install 6.1.

Program NI boards using the DAQ Libary and Borland C++ builder 5

Hi,
I am programming Lab PC-1200 NI boards using the DAQ Libary and Borland C++ builder 5.
But I get the following error msg:"[Linker Error] 'C:\NI-DAQ\LIB\NIDEX32.LIB' contains invalid OMF record, type 0x21 (possibly COFF)" although I have linked all DAQ lib files in C builder.
Anyone who had tried or succeeded in a similar application and solved this problem??
Thank you in advance for your help!

Hi w,
Please check out this related DevZone question/answer:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=5065000000080000007D180000&ECategory=Measurement+Hardware.Real-Time+Data+Acquisition
The basic reason is that we design our libraries for many environments, but Builder is not one of them. You can use the dll's (they're just dll's), but you will need to make your own library or use run-time linking.
For more information about run-time linking, you can try http://msdn.microsoft.com and search for "About Dynamic-Link Libraries"
I hope this gives you a start.
John N
Applications Engineer
National Instruments

Ground loop + BNC 2120 behaving like antenna(problem)

Hi,
I am using DAQ 6024E, and using two sensors and one error message "data is overwritten before it could be read
by the system try divide the signal before measurement" --it took me whole day as to what data is going inside that my computer with 900Mhz processor is unable to handle. I started tearing my hardware step by step. I looked at my range sensor which has one LED which blinks as it throws waves out - but the moment my motors gains speed all of a sudden my labview generates error that "data overwritten before it could be read by the system", now at the same time I looked at my range sensor and instead of blinking slowly like persec it was blinking continuously without break so I took the wire out which was going into the BNC 2120 and the sensor becomes stable again.
I thought that may be the wire is picking up RF signal from motors so I changed all the wires with shielded insulated wire but again as I switched my motors on labview generates the same error. If motors stays off there is no error. I felt my BNC is acting like antenna and is catching motor RF signals. I took motor out of the circuit and supplied separate voltage from another power supplier and it confirmed me that moment my motor speeds up the range sensor speed of blinking increases but If I take out the signal wire going into BNC 2120 then there is no effect on range sensor and it works fine steady. moment I connect BNC with sensor and motors ON then sensor behave erratically with led blinking extremely rapidly.
So it is confirmed that nothing is wrong with hard ware of computer but some strange phenomenon.
Now next I powered my controller with a battery and motors with another power supply to break the loop but problem not solved, I think there is some ground loop thing going on and that is making BNC 2120 as antenna for RF signal created by motor.
That's why initially at less voltage/speed VI works fine but as motors speed up VI stops working and generating the error " data is overwritten before it could be read
by the system try divide the signal before measurement"
I hope now you are in better situation to understand what is happening and how can I stop BNC wire to act like this, remember I am using good insulated shielded wire.
Thanks

I've got fast fingers, I play lead guitar in a rock n roll band (nah, just wish I did, but I do play lead guitar - just a bit rusty at it right now). I've spent the last 20+ years being a test engineer at various places. I learned from some of the best at AT&T and Bell Labs (when they were a big dog in the 80's). Before that I was a mobile radio repair technician for 8 years. Learned RF and electronic repair on the job. Troubleshooting background has helped me tremendously in the test engineering world. Also spent three years doing SCADA engineering so I am familiar with PLCs (Motorola, Allen Bradley, and GE Fanuc) and HMI software (Wonderware and GE Cimplicity). SCADA was fun, but I prefer the RF world.
Getting back to the problem, you give good advice about grounding only one end of the shielded cables. Grounding both ends does cause problems with non RF signals. A scope will go a long way to determine where the problem is coming from. But since he mentioned ultra sonic sensors, I am wondering if the problem is actual sonic noise from the motor. I would not be able to hear it because I lost all hearing above 12KHz from all that loud guitar playing when I WAS in a rock n roll band.
BTW, your name reminds me of the Rush song, Analog Kid, and also of the progression of analog synthesizers to digital ones, and now there is a movement back to the analog dinosaurs again.
- tbob
Inventor of the WORM Global

What is the max sampling frequency of a BNC-2120

my windows platform is NT and i have labview 6.1

Hi Ulises,
I don't quite undersatnd what you mean? The BNC-2120 is a connector block which interfaces to E-Series and 671x boards. The BNC-2120 simplifies the connection of real world signals to the DAQ device. There is no sampling rate you can set. The limiting factor of the samplingrate is the DAQ Device you're using, not the BNC-2120.
I hope I haven't misunderstood your question.
Regards,
Luca
Regards,
Luca

Generate Digital Pulses BNC 2120

Hello,
I am new to LabView and I am trying to use a DAQ Assistant to generate a discrete number of digital square pulses to be fed to a stepper motor driver via BNC 2120. But I don't know how to go about doing this.
I had an idea that I would use a Timed Sequence with 2 frames, the first frame would have a DAQ in it, and there would be a 1-D array of Boolean (TRUE) input in to the "'data" field of the DAQ.
Then the second frame would have a DAQ in it, and there would be a 1-D array of Boolean (FALSE) input in to the "'data" field of the DAQ.
But like I said I am very new to LabView and so I don't know if this approach makes sense. Please offer some suggestions!

Hi all.
I am currently doing a final year project to run six stepper motors using labview.
I was using an arduino mega to control the motors. When I had wrote the program to control the motors realized I only had enough outputs to control one motor.
Now I intend on using the BNC 2120 to generate the pulses to run the motors but I have no idea where to start.
Any help would go along way.
I am using 6 Digital inputs for each motor. i have attached the VI i am using
thanks in advance
Attachments:
StepperMotor1 project.vi ‏28 KB

BNC 2120 compatibility with Matlab 2011a & SIT

Hello,
I am trying to read data from the BNC 2120 device into Simulink. I also need to use SIT to communicate the data output from the model with LabVIEW.
I am currently using Matlab 2011a and LabVIEW 2012.
The problem I face is that the hardware is not recognized when I use the data acquisition toolbox.
Please let me know what can be done to fix this problem.
Thanks
Bharat

Hi Bharat,
The BNC 2120 is a connector block so it may not show up in the Data Acquisition Toolbox. What will show up is the DAQmx device you have connected to the block. You can find a list of supported DAQmx devices here, https://www.mathworks.com/products/daq/supported/ni-daqmx.html .
I hope this helps.
MATLAB® and Simulink® are registered trademarks of The MathWorks, Inc.
Miles G.
National Instruments
Applications Engineer

Is it possible to install a BNC-2120 to a PCI-1200

SH6850, SC5068 and D6850 (cables for 50-68 pins adapters) do not have the PCI-1200 pinout. Is there any adapters to interface a PCI-1200 to a BNC-2120?

Hello;
Unfortunately, the BNC-2120 is meant to be conneted to E-series DAQ devices only. It won't work with the 1200 series.
Regards
Filipe A.
Applications Engineer
National Instruments

Compact DAQ 9215 BNC module -- Error code -200278 occured at DAQmx read

Hi,
I am trying to read data from a sensor giving an output between +/- 300mv. It is connected to the 9215 BNC module on the Compact DAQ chassis. When i try to acquire any number of samples at any frequency it comes up with an error message at the end (-200278). I have attached the screenshot of the error message.
The program displays information in realtime in a waveform chart on the front panel as the samples are acquired and also writes them onto a lvm file. I have also attached the vi of the program.
Please help me as i cannot solve this problem. All help will be appreciated.
Thanks
Harshil
Attachments:
Error Message.jpg ‏29 KB
Compact DAQ 9215 BNC.vi ‏74 KB

Hi,
Thanks for the help. I have tried to use arrays to
store the data before i write to the file. The problem is when it writes at the
end, the format changes and i do not get the channel name and the dt
value (time interval between samples).
Also if i select more than two channels than i do not get two colums in
the output file but one column with both the values of the channels one after the other and thus becomes very hard to make where one channel ends the other begins.
Please help on how to get round this.
Harshil
Attachments:
Compact DAQ 9215 BNC.vi ‏93 KB

Need to generate a TTL pulse of 3 ms using USB Daq 6361

Hi all,
I need to generate a TTL pulse of 3 ~ 5 ms to trigger my external device. I am using USB daq 6361 with BNC connectors. I tried to use this examples(attached) but was not succesfull , can any one help me out in this, I just want a TTL pulse out to trigger my device. I tried to modify the example to see the wave form out but all it shows is a straight line. I want to generate a TTL pulse as soon as my program starts.
Am I using wrong example? should I use somethis else to generate the pulse. please let me know.
Thanks,
Attachments:
Capture.PNG ‏76 KB
Digital - Continuous Output_ttl.vi ‏65 KB

AnkitG wrote:
Jeff·Þ·Bohrer wrote:
Why would you create an Task with an analog output? its a Digital line you want to drive! and, just create it in the project.
Hi Jeff,
thanks but I couldnt understand , what you meant by create in project? Can you please explain. should I create digital line but I am still getting the same error.
Creating DAQmx items in Project Explorer saves the DAQmx object properties as part of the *.lvproj file. This can be very useful when the Task configuration does not change in the built application and you seldom want to use the task elsewhere. If you want to make minor tweaks to configuration of the run-time app there is even a human readable text file in the build output where properties like scale offsets, timing rates or ranges can be modified without redeploying a new app.
Jeff

Great connectors found to work with BNC 2110, BNC 2120, BNC 2121, etc. BNC to 2-wire connectivity

If you need to go from BNC to two wire connections when using Multifunction DAQ, I've discovered two useful BNC adaptors from www.pomonaelectronics.com . They are: Pomona 4969 and 4970. The first is BNC Female to two wire and the second is BNC Male to two wire adaptors. This enables us to use BNC cables to make nice clean BNC connections on the NI connector blocks and at the other end break out to two wires for connection to various (non-BNC) signal conditioning devices.

Hello Rob,
Thanks for this info....Much appreciated!
-Alan A.

Wire gauge for the BNC-2120

The User Guide for the BNC-2120 specifies AWG 24 maximum. But the connector openings look much larger. What is the reason for the limitation to such a small wire? Thanks. Wayne

The 24 awg rating is just what the connectors are designed to use. The manual says not to use a larger wire - just to be explicit, it means don't use a smaller gauge wire (as you mention).
The insulation stripping spec is similar. It is the length of wire that fully fills the connector without having extra to bend or accidentally get pushed aside to short another connector.
These are specified to make using it easier for you, and to keep unintended stress and shorts out of the system.
Hope that clears the intention of the specs up.
Regards,
John Nieri
Applications Engineer
National Instruments

Use of DAQ and BNC-2120

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