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

2011 5 23
5 个回答
回答已采纳
9 次查看（30 天）

0 个投票

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?

请先登录，再回答此问题。

 采纳的回答

Chirag Gupta
Chirag Gupta 2011-5-23

2 个投票

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.

2 个评论
显示 无 隐藏 无

Randy82
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
Chirag Gupta 2011-5-25
Hi Andreas, you might have required to transpose dataOut.

请先登录，再进行评论。

更多回答（4 个）

Laura Proctor
Laura Proctor 2011-5-23

0 个投票

This statement is because the NI 9401 device is not supported.
Here is a list of supported hardware for Data Acquisition Toolbox.
Chirag Gupta
Chirag Gupta 2011-5-23

0 个投票

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
Randy82
Randy82 2011-5-23

0 个投票

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.
Randy82
Randy82 2011-5-24

0 个投票

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.

类别

在 帮助中心 和 File Exchange 中查找有关 Hardware Discovery and Setup 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by