Method and device for transmitting serial data with a switchable data rate

Method for transmitting data on a bus system with at least two participating stations or bus stations, which exchange data frames via the bus system, where the data frames sent have a logical structure according to the CAN specification ISO 11898-1 where the temporal length of the bit within the data frame can assume at least two different values, wherein for a first predetermined area within the data frame temporal bit length is greater than or equal to a predetermined minimum value for example a microsecond and at least a second predetermined area within the data frame temporal bit length is at least halved compared with the first area, preferably less than half, which changes the temporal bit length They are performed through the use of at least two different scale factors to adjust the time unit bus form relat iva with respect to the unit time or smaller with respect to the oscillator cycle in progress during operation, characterized in that the bus participants emission with respect to ISO 11898-1 specification, accept a confirmation (acknowledgment Acknowledge- ) too late by one bit of the correct reception of the data frame via one or more receivers and / or accept one slot confirmation of receipt of at most two bits long, and not treated as an error.