Embodiments of a device and method are disclosed. In an embodiment, a CAN device is disclosed. The CAN device includes a TXD input interface, a TXD output interface, an RXD input interface, an RXD output interface, and a traffic control system connected between the TXD input and output interfaces and between the RXD input and output interfaces. The traffic control system is configured to detect the presence of CAN Flexible Data-rate (FD) traffic on the RXD input interface and if the traffic control system detects the presence of CAN FD traffic on the RXD input interface, disconnect the RXD input interface from the RXD output interface and disconnect the TXD input interface from the TXD output interface.