Transmitting/receiving device (12; 32) for a subscriber station (10; 30) of a serial bus system, having a first connection for receiving a transmission signal (TxD) from a communication control device (11; 31), a transmitting module for transmitting the transmission signal (TxD) onto a bus of the bus system, in which bus system at least a first communication phase (451, 452, 454, 455) and a second communication phase are used to exchange messages (45; 46) between subscriber stations (10, 20, 30) of the bus system, a receiving module for receiving the signal (S_SW) from the bus, wherein the receiving module is configured to generate a digital reception signal (RxD; RxD_T; RxD_R) from the signal (S_SW) received from the bus, characterized by a second connection for transmitting the digital reception signal (RxD; RxD_T; RxD_R) to the communication control device (11; 31) and for receiving an operating mode switch-over signal (RxD_TC) from the communication control device (11; 31) in order to switch over between operating modes of the transmitting/receiving device (12; 32) depending on the function of the subscriber station (10; 30) in the subsequent communication phase (451, 452, 454, 455; 453), and a switch-over feedback block (15; 35) for detecting, from the output signals of the transmitting module and of the receiving module, into which operating mode (Z_SL; Z_F_RX; Z_F_ZX) the transmitting module and the receiving module are switched, and for outputting feedback (R_S) about a performed switch-over of the operating mode (Z_SL; Z_F_RX; Z_F_TX) due to the operating mode switch-over signal (RxD_TC), wherein the switch-over feedback block (15; 35) is connected to the first connection for outputting the feedback (R_S) to the communication control device (11; 31) via the first connection. a first connection for receiving a transmission signal (TxD) from a communication control device (11; 31), a transmitting module for transmitting the transmission signal (TxD) onto a bus of the bus system, in which bus system at least a first communication phase (451, 452, 454, 455) and a second communication phase are used to exchange messages (45; 46) between subscriber stations (10, 20, 30) of the bus system, a receiving module for receiving the signal (S_SW) from the bus, wherein the receiving module is configured to generate a digital reception signal (RxD; RxD_T; RxD_R) from the signal (S_SW) received from the bus, characterized by a second connection for transmitting the digital reception signal (RxD; RxD_T; RxD_R) to the communication control device (11; 31) and for receiving an operating mode switch-over signal (RxD_TC) from the communication control device (11; 31) in order to switch over between operating modes of the transmitting/receiving device (12; 32) depending on the function of the subscriber station (10; 30) in the subsequent communication phase (451, 452, 454, 455; 453), and a switch-over feedback block (15; 35) for detecting, from the output signals of the transmitting module and of the receiving module, into which operating mode (Z_SL; Z_F_RX; Z_F_ZX) the transmitting module and the receiving module are switched, and for outputting feedback (R_S) about a performed switch-over of the operating mode (Z_SL; Z_F_RX; Z_F_TX) due to the operating mode switch-over signal (RxD_TC), wherein the switch-over feedback block (15; 35) is connected to the first connection for outputting the feedback (R_S) to the communication control device (11; 31) via the first connection.