XPLMGetAvionicsBusVoltsRatio

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XPLM_API float      XPLMGetAvionicsBusVoltsRatio(
                         XPLMAvionicsID       inHandle);

Returns the ratio of the nominal voltage (1.0 means full nominal voltage) of the electrical bus to which the given avionics device is bound, or -1 if the device is not bound to the current aircraft.