A biosensor includes a working electrode 101, a counter electrode 102 opposing the working electrode 101, a working electrode terminal 103 and a working electrode reference terminal 10 connected to the working electrode 101 by wires, and a counter electrode terminal 104 connected to the counter electrode 102 by a wire. The substrate includes a display area and a peripheral area surrounding the display area. The pipe attachment includes a pipe cover, a first and a second protective cover, and a pipe holder. The receiver ascertains a cryptographic checksum, which, in the course of the integrity check, is compared with a cryptographic checksum that has been produced by the transmitter and sent along by the respective message. The device may also have a filter for identifying packets of one or more ports of the Ethernet network.