Problems using "digitalio" with National Instruments NI 9401 CompactDAQ-Modul

Question

Randy82 2011-5-23

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Hey together!

I have some problems using "digitalio" with National Instruments NI 9401 CompactDAQ-Modul. I am working on Win XP (32 bit) and want to create a digital output with matlab.

I do like described in the help... When I type:

daq.getDevices

I get: Data acquisition devices:

index Vendor Device ID          Description          
----- ------ --------- ------------------------------
1     ni     cDAQ1Mod1 National Instruments NI 9211
2     ni     cDAQ1Mod4 National Instruments NI 9201
3     ni     cDAQ1Mod6 National Instruments NI 9263
4     ni     cDAQ1Mod8 * National Instruments NI 9401
* Device not recognized and may require additional configuration information.

I don't know, why the last device (what I want to use) is not recognized.

So when I type:

dio = digitalio('nidaq','cDAQ1Mod8');

I get an error message:

??? Error using ==> digitalio.digitalio at 117
The specified device ID is invalid. Use DAQHWINFO(adaptorname) to
determine
valid device IDs.

Could anyone imagine why?

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Answer 1

Chirag Gupta 2011-5-23

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在 MATLAB Online 中打开

So basically, you need to follow either of the 2 examples:

Generates data in the foreground: http://www.mathworks.com/help/toolbox/daq/bsob84e-1.html#bsob867-1

Generates data in the background: http://www.mathworks.com/help/toolbox/daq/bsob84e-1.html#bsob885-1

With analog output, you can formulate your signal, queue it and start analogoutput.

For a step signal, something like:

dataOut = zeros (1,1000);
dataOut(1:200) = ones(1,200)*4.5;
s = daq.createSession('ni');
s.Rate = 1000
s.addAnalogOutputChannel('cDAQ1Mod2',0,'Voltage')
s.queueOutputData(dataOut);
s
s.startForeground();

This will generate a step for 0.2 seconds. You could use continuous generation to reuse the data to continuously generate the same signal.

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Randy82 2011-5-24

Hey Chirag,

another problem occurs on using your example:

There is the Error-Message "The data argument must contain one column for each output channel in the sesssion"

What could be the reason?

Chirag Gupta 2011-5-25

Hi Andreas, you might have required to transpose dataOut.

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Answer 2

Laura Proctor 2011-5-23

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This statement is because the NI 9401 device is not supported.

Here is a list of supported hardware for Data Acquisition Toolbox.

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Answer 3

Chirag Gupta 2011-5-23

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To add on more to Laura's answer:

Data Acquisition Toolbox supports CompactDAQ only with its new session based interface.

Currently in MATLAB R2011a, the session based interface supports various analog inputs, analog outputs, counters and timers.

http://www.mathworks.com/help/toolbox/daq/bskx95j.html

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Answer 4

Randy82 2011-5-23

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Ok, thanks for your help so far. I looked up what devices are supported now...

So I could use NI 9263 device. Thats an analog output module. I looked up in the help directory how it could work with the session based interface.

But how can I get a step function out of it? I need to set a signal of 4,5 volts for about 1 second out of it.

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Answer 5

Randy82 2011-5-24

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Hey Chirag, thank you very much. I will try this.

Do you think on the other side there is a possibility to listen in an GUI with matlab to my National Instruments NI 9201 analag input and do some action in the GUI when the input is more than 4 Volts? I dont know if it would possible to listen all the time for an inputsignal.