A sensor for measuring at least one measurement variable, a sensor network which has several sensors and a method for operating the sensor network. The sensor initially has a measurement variable sensor which is used to convert the measurement variable into an electric signal. A transducer is used to convert the electric signal into measurement data. The sensor has a first communication interface for transferring the measurement data and other data in accordance with a first protocol and a second communication interface for transferring the measurement data and other data in accordance with a second protocol. The sensor also has a data exchange unit for exchanging data between the transducer, the first communication interface and the second communication interface.