daq process usb-6008

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mado
mado 2013-8-18
how to acquire data from this code to process it in another operation in realtime
% get connected devices
d = daq.getDevices
%create session
s = daq.createSession('ni')
%add analog channel s.addAnalogInputChannel('ID',channel num, 'measurement type')
s.addAnalogInputChannel('Dev1',0, 'Voltage')
% set rate of scan 4 scans/second , run for 3 seconds
s.Rate=1000;
s.DurationInSeconds=30;
v= s.Channels(1);
set(v)
%_____________________________
v.TerminalConfig = ' Differential';
v.Coupling = ' DC';
%start continuous aquisition and plot
h = s.addlistener('DataAvailable', @(src,event) plot(event.TimeStamps, event.Data/.001));
s.NotifyWhenDataAvailableExceeds = 200;
s.startBackground()

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回答（2 个）

Walter Roberson
Walter Roberson 2013-8-18
The line
h = s.addlistener('DataAvailable', @(src,event) plot(event.TimeStamps, event.Data/.001));
creates the (anonymous) callback function that will be called when data is available; in this case the data is plotted. You would change that line to do whatever processing you needed.
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mado
mado 2013-8-21
编辑：Walter Roberson 2013-8-21
just i changed differential to SingleEnded
%%get connected devices
d = daq.getDevices
%create session
s = daq.createSession('ni')
%add analog channel s.addAnalogInputChannel('ID',channel num, 'measurement type')
s.addAnalogInputChannel('Dev1',0, 'Voltage')
% set rate of scan 4 scans/second , run for 3 seconds
s.Rate=1000;
s.DurationInSeconds=30;
v= s.Channels(1);
set(v)
%_____________________________
v.TerminalConfig = ' SingleEnded';
v.Coupling = ' DC';
%start continuous aquisition and plot
h = s.addlistener('DataAvailable', @(src,event) plot(event.TimeStamps, event.Data));
s.NotifyWhenDataAvailableExceeds = 200;
s.startBackground()
s.wait()
delete (h)
h = s.addlistener('DataAvailable', @storedata);s.NotifyWhenDataAvailableExceeds = 200;
s.startBackground()
global matrix_index
global matrix_data
matrix_data(1:matrix_index)
Walter Roberson
Walter Roberson 2013-8-21
As complete speculation: is it possible that you need channel 1 instead of channel 0 for your single ended measurement ?

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mado
mado 2013-8-21
I need to use both of channel 0 and 1 , will it make a difference ?
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mado
mado 2013-8-21
编辑：Walter Roberson 2013-8-21
ok, i know that Analog Input Channels 0 to 7—For single-ended measurements, each signal is an analog input voltage channel. For differential measurements, AI 0 and AI 4 are the positive and negative inputs of differential analog input channel 0. The following signal pairs also form differential input channels: <AI 1, AI 5>, <AI 2, AI 6>, and <AI 3,AI 7>.
how to verify writing , i think it's written right
Walter Roberson
Walter Roberson 2013-8-21
If you have checked your wiring, then I suggest you open a case with MATLAB technical support. I do not have the software or equipment to go further on this myself.

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