System for communication between a central controller and items in a factory using infrared light

• US 5,742,238 A
• Filed: 09/01/1995
• Issued: 04/21/1998
• Est. Priority Date: 09/01/1995
• Status: Expired due to Term

• Current Assignee: Brooks Automation (Germany) GmbH (Azenta, Inc.)
• Original Assignee: EMTRAK, Inc.
• Inventors: Fox, Christopher Wayne
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): Beaulieu, Yonel
• Application Number:
  US08/522,692
• Time in Patent Office: 963 Days
• Field of Search: 340/825.35, 340/825.49, 340/825.54, 340/505, 340/568, 340/572, 340/825.36, 455/343, 235/382.5
• US Class Current: 340/8.1
• CPC Class Codes: G08B 3/1083 Pager locating systems
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system using microterminals attached to work pieces, containers and workers for tracking the location of work in a factory and for communication with workers to provide instructions for further processing. A central control system, to which infrared transceivers strategically located throughout the factory are wired, communicates with the microterminals via infrared transmissions between the microterminals and transceivers. The microterminals have four modes of operation to extend battery life.

Claims

1. A communications and tracking system for use in a workplace having a plurality of distinct work areas comprising:

(a) a computer system;

(b) a system controller connected to said computer system via a network;

(c) a plurality of transceivers, each transceiver;

(1) being fixed in one of said distinct areas of the workplace;

(2) having an infrared transmitter and receiver for modulated light beam communication within the said distinct area where said transceiver is fixed;

(3) having means for electronically communicating with said system controller;

(4) having means for translating modulated light communication into electrical communication and electrical communication into modulated light communication; and

(5) having means for generating beacon messages having a unique identification code imbedded therein.

(d) a plurality of microterminals, each microterminal having;

(1) a microcontroller;

(2) operator input means;

(3) a display;

(4) an infrared transmitter and infrared receiver for modulated light beam communication with a transceiver when the microterminal is located in the same distinct work area of the workplace as the transceiver; and

(5) four modes of operation including;

(a) an operate mode wherein said microcontroller, display and infrared receiver are powered so the microterminal is ready to communicate with the system controller through one of said transceivers;

(b) a stand-by mode wherein the microcontroller and receiver are periodically activated at a constant predetermined interval to receive beacon messages, to check for a change in the location of the microterminal based upon the identification code imbedded in the beacon message received, and to check for messages directed to the microterminal by the system controller;

(c) a power saving mode wherein the portable microterminal is activated to check for messages at a predetermined interval which increases incrementally from about 5 seconds to more than 4 minutes over time if no transceiver beacon messages are received by the portable microterminal; and

(d) an extended sleep mode invoked by a message issued to the microterminal by the system controller through one of said transceivers, in which the microterminal cannot communicate with the system controller or changing to another mode in the absence of activation of the operator input means.

2. The system of claim 1 wherein each of said portable microterminals generates a message to the system controller through the transceiver if the portable microterminal determines it has been moved from one distinct area of the workplace to another.

3. The communication and tracking system of claim 1 wherein each of said portable microterminals has:

(a) an operate mode wherein said microcontroller, display and infrared receiver are powered so the microterminal is ready to communicate with the system controller through one of said transceivers;

(b) a stand-by mode wherein the microcontroller and receiver are periodically activated to receive the transceiver beacon messages, to check the location of the microterminal, and to check for messages directed to the microterminal by the system controller.

(c) a motion detection switch to change the microterminal from the stand-by mode to the operate mode.

4. The communication and tracking system of claim 1 wherein each of said portable microterminals stores text messages and graphic images, received from the system controller through one of said transceivers, and recalling said text messages and graphic images to the display based on signals received from the operator input means or from the system controller through one of said transceivers.

5. The communication and tracking system of claim 1 wherein each of said portable microterminals has a unique identification means used to track the location of a specific portable microterminal, used to address messages to a specific portable microterminal, and used to identify which specific microterminal is the source of a message.

6. The system of claim 1 wherein at least one of said portable microterminals can be attached to a work piece to be processed in the workplace.

7. The communication and tracking system of claim 1 wherein at least one of said portable microterminals can be worn by a worker.

8. The communication and tracking system of claim 1 wherein at least one of said portable microterminals can be attached to a container for items to be processed in the workplace.

9. A communication and tracking system including at least one portable microterminal having a transmitter, a receiver, a microcontroller, operator input means, and a display, said microterminal having:

(a) an operate mode wherein said microcontroller, display, and receiver are powered so that the microterminal is ready to communicate;

(b) a stand-by mode wherein the microcontroller and receiver are periodically activated at a predetermined fixed interval to receive transceiver beacon messages, to check the location of the microterminal and to check for messages directed to the microterminal;

(c) a power saving mode wherein said microterminal is activated to check for messages at a predetermined interval which increases incrementally from about 5 seconds to more than 4 minutes over time if no beacon messages are received by said microterminal;

(d) an extended sleep mode involved by a message received by the microcontroller'"'"'s receiver and terminated by activation of the operator input means; and

(e) a motion detection switch for changing the microterminal from the stand-by mode to the operate mode.