Duplex data transfer via portable electronic device and field device

摘要

The device has a displaying unit (17) and an input keyboard (18). A machine-readable code of a field device (2) displayed on the displaying unit corresponds to data of a portable electronic device (3) to be transmitted. The portable electronic device is provided with a reading device (19) for the machine-readable code, and is provided with an automatic actuating unit (20) for inputting another machine-readable code through the input keyboard of the field device. The latter code corresponds to data of the field device. The field device is designed such that the latter code is evaluated.