SERIAL DATA TRANSMISSION VIA A BUS SYSTEM

The present invention relates to a passive component for a bus system, such as, for example, a field bus system, having a bus interface for connection to a bus, a serial interface for serially reading out and reading in data, a data memory with an output area for storing data which has been read in via the bus interface and is to be read out via the serial interface and an input area for storing data which has been read in via the serial interface and is to be read out via the bus interface, and a control device for controlling the transmission and storage of data, a detection device to detect the status of the output area and of the input area and providing corresponding status information being provided, which status information is used as the basis for reading data into the output area and reading data out of the input area via the bus interface when the bus system is connected. The present invention also comprises a corresponding active component for exchanging data with such passive component, and a method for reading data in and out of a bus system which comprises such a passive component and such an active component. The present invention makes data communication possible between such a bus system and one or more decentralized peripherals or serial interfaces.