A method and device for handling data transmissions in a redundant data network comprising a first network and a second network and a transmission protocol, further comprising a plurality of nodes, of which at least two nodes are each connected to a first network and a second network. In the electronic apparatus equipped with the input device allowing various input operations, the input device including first signal generators is positioned by being placed in an opening of a housing from the outside. The worm has one end having a periphery provided with one-direction ratchet teeth.