Method and device for serial data transmission with the addition of inserted data

Disclosed is a method and apparatus in order to transfer additional data between at least two participants of a bus system. The object is inventively achieved in that the transmitted data frame is a logical structure according to the , and in that at least two additional short bits are inserted so within the temporal bit length of at least some CAN bits, that at least for one of the two possible values ​​of the current CAN bits, the first of inserted in this CAN-bit additional bits with this value opposite bus level is transmitted.