A conveyor apparatus includes a drive unit, a connection interface which transmits analog signals, and a drive control module which is coupled to the drive unit and to the connection interface via signal technology. The drive control module receives analog control signals via the connection interface in an operating state and controls the drive unit as a function of the analog control signals, outputs digital diagnostic signals via the connection interface in a digital communication state, and switches from the operating state to the digital communication state upon receipt of a switchover command. The switchover command is made up of a predetermined analog control signal or a predetermined sequence of analog control signals.