in a method for serial communication of data frames between nodes connected by a bus system , the transmitter and receiver roles are assigned to the nodes for each data frame by the arbitration procedure defined in the can - standard iso 11898 - 1 . the exchanged data frames , which include multiple bits , have a logical structure according to the can - standard iso 11898 - 1 , including a start - of - frame - bit , an arbitration field , a control field , a data field , a crc field , an acknowledge field and an end - of - frame field . each bit has a bit time which is divided into time segments . in response to a predefined value of a specific bit within the control field a first node of a first node group restarts its protocol decoding state machine and waits until it has synchronized itself to the bus activity and a second node of a second node group communicates using can fd specification protocol .