MATLAB: Is a key of the Data Acquisition toolbox getting checked out at MATLAB R14SP2 startup

Data Acquisition ToolboxMATLAB

When I start MATLAB, I receive a "License Manager Error -4" in the MATLAB Command Window for the Data Acquisition Toolbox. In subsequent MATLAB sessions, I no longer receive this error, but the command 'license inuse' shows that Data Acquisition and MATLAB licenses are checked out.

Best Answer

This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

This issue has been resolved in future releases. For R14SP2 and earlier, the workaround is to edit the prefspanel.m file. Please follow the instructions below:

- Open the prefspanel.m file in text editor. The file is located at $MATLAB/toolbox/daq/daq/

- Comment out line #79 where it says "daqhwinfo('parallel');"

NOTE: commenting out this line will have no impact on MATLAB.

Related Solutions

MATLAB: Can I use the National Instruments USB-9263 with Data Acquisition Toolbox 2.14 (R2009a)

This enhancement has been incorporated in Data Acquisition Toolbox 2.15 (R2009b). For previous product releases, read below for any possible workarounds:

The National Instruments USB-9263 is not supported in Data Acquisition Toolbox 2.14 (R2009a).

To work around this issue, perform these steps to add support for this device in MATLAB 7.8 (R2009a):

1. Quit MATLAB.

2. Find the following file:

$MATLABROOT\toolbox\daq\daq\private\mwnidaqmx.ini (where $MATLABROOT is the MATLAB root installation directory obtained by issuing:

matlabroot

at the MATLAB Command Prompt.)

3. Make a copy of this file and rename it to mwnidaqmx.ini.old.

4. Now, open the file mwnidaqmx.ini in a text editor, and add the following lines to the INI file at the end:

 [USB-9263] 
 hasAnalogInput   = false 
 hasAnalogOutput  = true 
 numAOChannels    = 4 
 maxAOSampleRate  = 333333,200000,133333,105263 
 hasDigitalIO     = false

5. Save the file mwnidaqmx.ini and restart MATLAB.

MATLAB: Do I receive an error while using the GETDATA function with the Data Acquisition Toolbox 2.5.1 (R14SP1)

This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

We have verified this as a bug in the Data Acquisition Toolbox 2.5.1 (R14SP1) in the way the engine works with an external clock. When working with an external clock, the engine sometimes makes errors in determining when a particular hardware trigger took place.

When a device is operating with external clocking, it is hard for the software to determine when a trigger or a sample occurred. The toolbox uses the SampleRate property to estimate when a sample or trigger occurred. To work around this issue, set the SampleRate property to a value equal or greater than the external clock rate.

Best Answer

Related Solutions

MATLAB: Can I use the National Instruments USB-9263 with Data Acquisition Toolbox 2.14 (R2009a)

MATLAB: Do I receive an error while using the GETDATA function with the Data Acquisition Toolbox 2.5.1 (R14SP1)

Related Question