Polling-type information transmission system

Details Polling-type information transmission system Polling-type information transmission system

1990-11-06

1992-09-22

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082508, 34082552, 34087003, 370 858, H04Q 100

Patent

active

051501147

ABSTRACT:
A transmission system comprising an interrogator (1) and a number of transponders (2). The transponders (2) communicate with the interrogator (1) by means of individual addresses for reading and/or writing of information in the transponders, which admits more than one transponder to be located within the read/write zone of the interrogator. By transmitting the start code from the interrogator and giving the transponders opportunity to answer with an address dependent time delay of the reply code and investigating time differences between transmitted and received reply codes in the interrogator, the address of the transponder is determined. The transmission system is suitable for use in connection with identification, for example, personal identification.

REFERENCES:
patent: 4071908 (1978-01-01), Brophy et al.
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4595921 (1986-06-01), Wang
patent: 4604618 (1986-08-01), Akiba et al.
patent: 4667193 (1987-05-01), Cotie et al.
patent: 4940974 (1990-07-01), Sojka

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