Verfahren und Einrichtung zum Datenaustausch zwischen einer zentralen Einheit und einer Datenendeinrichtung

The invention relates to a method for data transmission between a central unit devoted to data processing, storage and provision and a data terminal equipment via a communications channel. To this end, a long-term inalterable, application-independent query structure (general query structure) and a small amount of long-term inalterable, application-independent answer formats are initially stored both in the central unit and in the data terminal equipment. The specific query structure for each application is defined on the basis of the general query structure and stored in the central unit in the form of a set of parameters. Upon request, the data terminal equipment demands a specific query structure that it has not yet stored from the central unit via the communications channel, receives the appropriate set of parameters and stores. To conduct a query function, the appropriate specific query structure is formed in the data terminal equipment assisted by the corresponding set of parameters on the basis of the general answer structure and transmitted to the central unit after the user has at least partially filled them in, and the data terminal equipment provides the user the answers to the query which were transmitted to it by the central unit on the basis of one of the stored answer formats indicated in the relevant answer.