Subscriber station (10; 30) for a serial bus system , having a communication control device (11; 31) for controlling communication between the subscriber station (10; 30) and at least one other subscriber station (10; 20; 30) of the bus system , and a transmitting/receiving device (12; 32) for transmitting a transmission signal (TXD) generated by the communication control device (11; 31) onto a bus of the bus system , with the result that, for a message exchanged between subscriber stations of the bus system , the bit time (t_bt) of a signal transmitted onto the bus in the first communication phase can differ from a bit time (t_bt) of a signal transmitted in the second communication phase , characterized in that the communication control device (11; 31) is configured to generate the transmission signal (TXD) according to a frame (450; 450_1; 4500) and to insert in the frame (450; 450_1; 4500) at least one field (FCP; FCP_1; FCP_2) which is configured for checking whether the bit stream of the frame (450; 450_1; 4500) is offset by at least one bit compared with the expected frame (450; 450_1; 4500) in a subscriber station (10; 20; 30) of the bus system which receives the frame (450; 450_1; 4500) but is not a transmitter of the frame (450; 450_1; 4500), and wherein the communication control device (11; 31) in the case where the subscriber station (10; 30) is not a transmitter of the frame (450; 450_1; 4500) is configured to use the at least one field (FCP; FCP_1; FCP_2) for checking whether the bit stream of the received frame is offset by at least one bit compared with the expected frame (450; 450_1; 4500). a communication control device (11; 31) for controlling communication between the subscriber station (10; 30) and at least one other subscriber station (10; 20; 30) of the bus system , and a transmitting/receiving device (12; 32) for transmitting a transmission signal (TXD) generated by the communication control device (11; 31) onto a bus of the bus system , with the result that, for a message exchanged between subscriber stations of the bus system , the bit time (t_bt) of a signal transmitted onto the bus in the first communication phase can differ from a bit time (t_bt) of a signal transmitted in the second communication phase , characterized in that the communication control device (11; 31) is configured to generate the transmission signal (TXD) according to a frame (450; 450_1; 4500) and to insert in the frame (450; 450_1; 4500) at least one field (FCP; FCP_1; FCP_2) which is configured for checking whether the bit stream of the frame (450; 450_1; 4500) is offset by at least one bit compared with the expected frame (450; 450_1; 4500) in a subscriber station (10; 20; 30) of the bus system which receives the frame (450; 450_1; 4500) but is not a transmitter of the frame (450; 450_1; 4500), and wherein the communication control device (11; 31) in the case where the subscriber station (10; 30) is not a transmitter of the frame (450; 450_1; 4500) is configured to use the at least one field (FCP; FCP_1; FCP_2) for checking whether the bit stream of the received frame is offset by at least one bit compared with the expected frame (450; 450_1; 4500). <EOS>