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

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)

Answer 1

[Walter Roberson]

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.

[mado]

do you mean that this code is correct ?

[Walter Roberson]

I don't see any obvious problem with the code. I would not normally add two listeners for the same event but I guess you could.

When you post error messages please post the exact text including the traceback showing the sequence of calls and the relevant line of code -- everything generated by the error.

Why are you not queuing anything for output?

[mado]

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)

Answer 2

[mado]

when i used queue output data error come in "

    % queueOutputData is disabled because the session contains channels that do not support
clocked operations