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 differs from a bit time (t_bt) of a signal transmitted in the second communication phase , wherein the communication control device (11; 31) is configured to generate the transmission signal (TXD) according to a frame (450; 450_1; 4500) in which a field for a header checksum (H_CRC) and a field for a frame checksum (F_CRC) are provided, wherein the communication control device (11; 31) is configured to provide, in the frame (450; 450_1; 4500), an identifier which indicates the priority for transmitting the exchanged message onto the bus , and wherein the communication control device (11; 31) is configured to provide at least one further identifier in the frame (450; 450_1; 4500), wherein the at least one further identifier, as a message identifier (MSG ID), indicates the content of data in a data field of the exchanged message or, as a transmitter identifier (TX ID), indicates the transmitting subscriber station for the exchanged message or, as a virtual network identifier (VLAN ID), indicates forwarding information for the exchanged message . 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 differs from a bit time (t_bt) of a signal transmitted in the second communication phase , wherein the communication control device (11; 31) is configured to generate the transmission signal (TXD) according to a frame (450; 450_1; 4500) in which a field for a header checksum (H_CRC) and a field for a frame checksum (F_CRC) are provided, wherein the communication control device (11; 31) is configured to provide, in the frame (450; 450_1; 4500), an identifier which indicates the priority for transmitting the exchanged message onto the bus , and wherein the communication control device (11; 31) is configured to provide at least one further identifier in the frame (450; 450_1; 4500), wherein the at least one further identifier, as a message identifier (MSG ID), indicates the content of data in a data field of the exchanged message or, as a transmitter identifier (TX ID), indicates the transmitting subscriber station for the exchanged message or, as a virtual network identifier (VLAN ID), indicates forwarding information for the exchanged message . <EOS>