Device for machine communication in data transmission

US5202550A · kind A · utility

Assignee

• Skidata Computer (yesellschaft m.b.H.) · AT

Inventors

• Wolfram Kocznar · Innsbruck, AT
• Kurt Wallerstorfer · Straßwalchen, AT

Key dates

• Filing date: Jul 7, 1992
• Grant date: Apr 13, 1993
• Expiry date: Jul 7, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C9/28
• WIPO field: Control
• WIPO sector: Instruments

Abstract

For automated communication in a limited acquisition space, for example in order to identify or check an access authorization, use is made of active data supports which comprise a transmitter (15), a receiver (16), a read-write memory, an electric clock, a computer, a display and a power source (7). The checking station is also provided with a transmitter-receiver to check and possibly modify the data. Each transmitter-receiver has a limited communication space, of which the maximum extent is less than the minimum extent of the acquisition space. In this way it is not necessary to plug in the data support, of which a precise point must, however, be deliberately brought close to the checking station. In this way a definite coordination between the checking station and a further data support is prevented.