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Should you use interface objects or device objects to communicate with your instrument? Generally, device objects make instrument control easier and they offer greater flexibility to the user compared to using interface objects.
Because of the advantages offered by using device objects for communicating with your instrument, you should use device objects whenever possible. Some of these advantages are
You do not need to know instrument-specific commands
You can use standard VXIplug&play or IVI® instrument drivers provided by your instrument vendor or other party
You can use a MATLAB® instrument driver to control your instrument. To get a MATLAB instrument driver, you can
Convert a VXIplug&play or IVI driver
Use a MATLAB driver that is shipped with the toolbox
Create it yourself or modify a similar driver
Install it from a third party, such as MATLAB Central
You can create, convert, or customize a MATLAB instrument driver with the MATLAB Instrument Driver Editor tool (midedit).
In some circumstances, using device objects to communicate with your instrument would be impossible or impractical. You might need to use interface objects if
Your instrument does not have a standard instrument driver supported by the Instrument Control Toolbox™ software.
You are using a streaming application (typically serial, UDP, or TCP/IP interface) to notify you of some occurrence.
Your application requires frequent changes to communication channel settings.