WO1994017615A3 - Electronic price display system with data bus isolation - Google Patents

Electronic price display system with data bus isolation Download PDF

Info

Publication number
WO1994017615A3
WO1994017615A3 PCT/US1994/000822 US9400822W WO9417615A3 WO 1994017615 A3 WO1994017615 A3 WO 1994017615A3 US 9400822 W US9400822 W US 9400822W WO 9417615 A3 WO9417615 A3 WO 9417615A3
Authority
WO
WIPO (PCT)
Prior art keywords
bus
data
switch
electronic price
data bus
Prior art date
Application number
PCT/US1994/000822
Other languages
French (fr)
Other versions
WO1994017615A2 (en
Inventor
George T Briechle
Marvin Ackerman
Original Assignee
Electronic Retailing Syst
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronic Retailing Syst filed Critical Electronic Retailing Syst
Publication of WO1994017615A2 publication Critical patent/WO1994017615A2/en
Publication of WO1994017615A3 publication Critical patent/WO1994017615A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40039—Details regarding the setting of the power status of a node according to activity on the bus
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/04—Electronic labels

Abstract

An electronic price display system having electronic price displays (12) on a serial data bus (11) protects against shorts on the data line (28) of the bus by providing identifier modules (30) at many locations in the bus. Each identifier has a data bus isolator including a switch (40) selectively connecting and disconnecting first and second data terminals, and a current threshold sensor (35, 36) operatively coupled with the switch. The threshold is selected so that with actuation of the serial line driver and with a first impedance at the data line of the associated second bus (29) the switch conducts, and that with actuation of the serial line driver and with a second, lower impedance at the data line of the associated second bus (29) the switch (40) does not conduct. Advantageously the isolator shares circuitry with a current detector (35, 36) that permits the identifier (30) to monitor data transmissions on the data bus. Optionally the system is set up so that a pull-up resistor (13) on the data line is provided only when messages are to be propagated but not continuously.
PCT/US1994/000822 1993-01-25 1994-01-24 Electronic price display system with data bus isolation WO1994017615A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US820093A 1993-01-25 1993-01-25
US08/008,200 1993-01-25

Publications (2)

Publication Number Publication Date
WO1994017615A2 WO1994017615A2 (en) 1994-08-04
WO1994017615A3 true WO1994017615A3 (en) 1994-10-27

Family

ID=21730293

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/000822 WO1994017615A2 (en) 1993-01-25 1994-01-24 Electronic price display system with data bus isolation

Country Status (1)

Country Link
WO (1) WO1994017615A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5736967A (en) * 1993-09-03 1998-04-07 Kayser Ventures, Ltd. Article-information display system using electronically controlled tags
US6266052B1 (en) 1993-09-03 2001-07-24 Display Edge Technology, Ltd. Power and information distribution system for article display or storage areas and related method
US6181299B1 (en) 1993-09-03 2001-01-30 Display Edge Technology, Ltd. Power and communication system for electronic display tags
US6249263B1 (en) 1993-09-03 2001-06-19 Display Edge Technology, Ltd. Article-information display system using electronically controlled tags
JPH11514507A (en) * 1995-03-06 1999-12-07 エレクトロニック リーテイリング システムズ インターナショナル インコーポレイテッド Low power two-way wireless communication system for electronic shelf labels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2077076A (en) * 1978-05-31 1981-12-09 Vdo Schindling A circuit for detecting short circuits and for shutting down individual line sections of a bus-line
GB2194867A (en) * 1986-09-09 1988-03-16 Mitsubishi Electric Corp Disconnection of a sub-bus from a main bus
US4912724A (en) * 1985-06-10 1990-03-27 Northern Telecom Limited Bidirectional bus arrangement for a digital communication system
WO1993005475A1 (en) * 1991-09-10 1993-03-18 Electronic Retailing Systems International, Inc. System for displaying prices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2077076A (en) * 1978-05-31 1981-12-09 Vdo Schindling A circuit for detecting short circuits and for shutting down individual line sections of a bus-line
US4912724A (en) * 1985-06-10 1990-03-27 Northern Telecom Limited Bidirectional bus arrangement for a digital communication system
GB2194867A (en) * 1986-09-09 1988-03-16 Mitsubishi Electric Corp Disconnection of a sub-bus from a main bus
WO1993005475A1 (en) * 1991-09-10 1993-03-18 Electronic Retailing Systems International, Inc. System for displaying prices

Also Published As

Publication number Publication date
WO1994017615A2 (en) 1994-08-04

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