MATLAB Answers

Acquire Data and Generate Signals at the Same Time for usb 6008

4 views (last 30 days)
mado
mado on 11 Mar 2014
Edited: Walter Roberson on 24 Mar 2014
i used this code to aquire and write signals in usb 6008 simultaneously but message error appeared . how to solve that?
% The hardware associated with this session is reserved. If you are using it in another
session use the release function to unreserve the hardware. If you are using it in an
external program exit that program. Then try this operation again.
% % Initialization
%%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','ai0', 'Voltage')%irradiance
s.addAnalogInputChannel('Dev1','ai1', 'Voltage')%Temperature
s.addAnalogOutputChannel('Dev1', 'ao0', 'Voltage')
% set rate of scan 1000 scans/second , run for 30 seconds
s.Rate=100;
duration = s.DurationInSeconds
v.TerminalConfig = ' Differential';
%v.TerminalConfig = ' SingleEnded';
%_____________________________
%aquire data and process
lh = s.addlistener('DataAvailable', @plotData)
%store data
h = s.addlistener('DataAvailable', @storedata);
% Analog Output
ao_value = 3.5;
s.outputSingleScan(ao_value)
s.startBackground() s.wait()
delete (lh)
delete (h)

Answers (2)

Walter Roberson
Walter Roberson on 11 Mar 2014
The device is already in use. If you are using it in another MATLAB session, then either use release() in that session or terminate the session. If the device is being used by another program outside of MATLAB, then end that program. If there is nothing you can find that is using the device then reboot your computer and try again.
  3 Comments
mado
mado on 12 Mar 2014
ao_value = 3.5;
s.outputSingleScan(ao_value)%
this is my line to send output (3.5) is there any other method ?
i rebooted but another error came in " he session contains channels that do not support clocked operations using startForeground and startBackground." i created two sessions and it is working it can read and write .
%%Initialization
%
global Temperature
global Irradiance
global Vref
global data
%
%get connected devices
d = daq.getDevices
%create session
s = daq.createSession('ni')
s1= daq.createSession('ni')
%add analog channel s.addAnalogInputChannel('ID',channel num, 'measurement type')
s.addAnalogInputChannel('Dev1','ai0', 'Voltage')%irradiance
s.addAnalogInputChannel('Dev1','ai2', 'Voltage')%Temperature
s1.addAnalogOutputChannel('Dev1', 'ao0', 'Voltage')
% set rate of scan 1000 scans/second , run for 30 seconds
s.Rate=100;
duration = s.DurationInSeconds
%v.TerminalConfig = ' Differential';
v.TerminalConfig = ' SingleEnded';
%_____________________________
%aquire data and process
lh = s.addlistener('DataAvailable', @plotData);
%store data
h = s.addlistener('DataAvailable', @storedata);
% Analog Output
ao_value = 4;
s1.outputSingleScan(ao_value)
s.startBackground()
s.wait()
delete (lh)
delete (h)

Sign in to comment.


mado
mado on 15 Mar 2014
when i used queue output data error come in "
% queueOutputData is disabled because the session contains channels that do not support
clocked operations

Tags

Community Treasure Hunt

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

Start Hunting!