Transmission/reception device (12; 32) for a subscriber station (10; 30) of a serial bus system, having a transmission/reception element that has a transmission module and a reception module and is configured to communicate according to a first communication standard, a communication module having at least one element (151; 152) that can be used to change the first communication standard of the transmission/reception element to a second communication standard, such that the transmission/reception device is configured either according to the first communication standard for transmitting and/or receiving messages or according to the second communication standard for transmitting and/or receiving messages, a first connection line for connection to a connection for supplying the transmission/reception element and the communication module with electrical voltage, and a second connection line for connecting the communication module to earth, wherein the communication module is connected between the transmission/reception element and the connection for earth, wherein the transmission module is configured to transmit a transmission signal (TxD) onto a bus of the bus system, in which bus system at least a first communication phase and a second communication phase are used to exchange messages (45; 46) between subscriber stations (10, 20, 30) of the bus system, wherein the reception module is configured to receive the signal (VDIFF) from the bus and is configured to generate a digital reception signal (RxD) from the signal (VDIFF) received from the bus, wherein the communication module has at least one connection (158; 159) for receiving a signal (S_1; S_2) for activating or deactivating the at least one element (151; 152), wherein the signal (S_1; S_2) determines the communication standard according to which the messages (45; 46) are exchanged between subscriber stations (10, 20, 30) of the bus system, and wherein the at least one element (151; 152) contains components which, in combination with the transmission/reception element, configure the transmission/reception device for communication according to the second communication standard. a transmission/reception element that has a transmission module and a reception module and is configured to communicate according to a first communication standard, a communication module having at least one element (151; 152) that can be used to change the first communication standard of the transmission/reception element to a second communication standard, such that the transmission/reception device is configured either according to the first communication standard for transmitting and/or receiving messages or according to the second communication standard for transmitting and/or receiving messages, a first connection line for connection to a connection for supplying the transmission/reception element and the communication module with electrical voltage, and a second connection line for connecting the communication module to earth, wherein the communication module is connected between the transmission/reception element and the connection for earth, wherein the transmission module is configured to transmit a transmission signal (TxD) onto a bus of the bus system, in which bus system at least a first communication phase and a second communication phase are used to exchange messages (45; 46) between subscriber stations (10, 20, 30) of the bus system, wherein the reception module is configured to receive the signal (VDIFF) from the bus and is configured to generate a digital reception signal (RxD) from the signal (VDIFF) received from the bus, wherein the communication module has at least one connection (158; 159) for receiving a signal (S_1; S_2) for activating or deactivating the at least one element (151; 152), wherein the signal (S_1; S_2) determines the communication standard according to which the messages (45; 46) are exchanged between subscriber stations (10, 20, 30) of the bus system, and wherein the at least one element (151; 152) contains components which, in combination with the transmission/reception element, configure the transmission/reception device for communication according to the second communication standard.