This is a mandatory utility VI for instrument drivers. However the WFG500 generator does not support an error query as such, instead it returns an error byte after most commands. All VI's that have to deal with this error byte will do so and place a warning in the error out cluster if necessary. You can read the warnings directly in the source string from the error cluster or you can call the Error Message VI to display them in a window. Calling this VI will place the
“Error query not supported” warning in the error cluster. This VI is only added to comply to National Instruments' strict standards for inclusion of this driver into the IDL (Instrument Driver Library).