The transponder is suitable for usage for various applications: in stand-alone operation or on the esserbus. In esserbus operation, the Series 9200 automatic fire detectors and those of the IQ8Quad family (see features for types) can be used as detectors in door arrester systems (FSA - Fire, Failure and Shut-Off). In FSA transponder loop operation, the door arrester system status is indicated on the fire alarm control panel.For stand-alone operation, detectors of the IQ8Quad family are supported without loop isolator (see features for types).For operation, the transponder requires an external supply voltage. It is possible to monitor this voltage.