MEASURING SYSTEM FOR DETERMINING A VALUE OF A PHYSICAL OR CHEMICAL, MEASURED VARIABLE OF A MEDIUM AND METHOD FOR OPERATION OF THE MEASURING SYSTEM

摘要

A measuring system for determining a value of a physical or chemical, measured variable of a medium, comprises: a base unit; at least one relay unit connected with the base unit and a sensor unit connected with the relay unit. The relay unit is especially embodied to receive from the base unit, and to forward to the sensor unit, data, especially measurement data, operating data, commands or software modules, and/or to receive from the sensor unit, and to forward to the base unit, data, especially measurement data, operating data, commands or software modules wherein the sensor unit comprises a circuit having at least one microcontroller, at least a first memory region, in which a basic software of the sensor unit is stored, and a second memory region, in which an upload software of the sensor unit is stored. The upload software of the sensor unit is embodied, in interaction with the microcontroller, to perform an updating of the basic software of the sensor unit with at least one software module provided from the base unit. The relay unit comprises a circuit having at least one microcontroller, and at least a first memory region in which a basic software of the relay unit is stored. The circuit of the relay unit further comprises a second memory region, in which an upload software of the relay unit is stored, which is embodied, in interaction with the microcontroller of the relay unit, to perform an updating of the basic software of the relay unit with at least one software module provided from the base unit, and the upload software of the sensor unit, for execution by the microcontroller of the sensor unit, is activatable based on a comparison of a data sequence sent from the base unit with a first password assigned to the sensor unit, and the upload software of the relay unit, for execution by the microcontroller of the relay unit, is activatable based on a comparison of a data sequence sent from the base unit with a second password assigned to the relay unit. The second password is different from the first password.