Access control equipment

Access control equipment comprises an interrogation unit (IU) having means (14) for emitting an interrogation signal, and a plurality of transponders (e.g. T), each transponder (T) having a stored identity code different from that of the other transponders (T). This identity code comprises a plurali...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	DODD, HAROLD, STANIER, BRIAN JOHN DR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CALCULATING CHECKING-DEVICES COMPUTING COUNTING GENERATING RANDOM NUMBERS HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS REGISTERING OR INDICATING THE WORKING OF MACHINES TIME OR ATTENDANCE REGISTERS VOTING OR LOTTERY APPARATUS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Access control equipment comprises an interrogation unit (IU) having means (14) for emitting an interrogation signal, and a plurality of transponders (e.g. T), each transponder (T) having a stored identity code different from that of the other transponders (T). This identity code comprises a plurality of fields each holding a selected information bit. The interrogation signal is controlled so as simultaneously to interrogate the fields of all transponders (T) within range in a serial manner. A group reply signal is sent back to the interrogation unit (IU) from any transponder (T) having, in the field being interrogated, a bit matching that required by the interrogation signal. The interrogation unit (IU) is arranged to determine, from the series of received reply signals, the identity of each and every valid transponder (T) within range.