System and method for remote opening of handicap access doors

• US 6,956,495 B2
• Filed: 05/22/2001
• Issued: 10/18/2005
• Est. Priority Date: 05/22/2001
• Status: Expired due to Fees

• Current Assignee: Microchip Technology Incorporated, OneLink
• Original Assignee: Microchip Technology Incorporated, OneLink
• Inventors: Welling, Thomas L., Klein, Christopher J., Baynham, Mark S., Dykema, Kurt A., Duvenhage, Fanie
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): AU, SCOTT D
• Application Number:
  US09/862,857
• Publication Number:
  US 20020175827A1
• Time in Patent Office: 1,610 Days
• Field of Search: 340/825.19, 340/825.69, 340/825.72
• US Class Current: 340/4.11
• CPC Class Codes: E05F 15/77 using wireless control
• CPC Class Codes: G07C 2009/0023 with encription of the transmittted data signal
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/62 Rolling code

Abstract

A control system for remotely activating an automatically opening door according to the present invention includes a plurality of transmitters held by different people and each transmitter transmits control signals. The system further includes a plurality of doors at least some of which are mounted in different buildings. Each of the doors includes an actuator for automatically opening and closing the door and a receiver electrically coupled to the actuator for receiving control signals from the transmitters and activating the actuator to open the door in response to the receipt of the control signals. In this system, any one of the transmitters may be used to open any of the doors.

Claims

1. A receiver for an automatic door assembly having a door and an actuator coupled to the receiver for automatically opening and closing the door in response to an activation signal, said receiver comprising:

a receiver circuit for receiving hopping code control signal from a plurality of remote transmitters, the hopping code control signals each including a fixed serial number unique to the remote transmitter from which the control signal is transmitted, and a hopping code that changes with each transmission from the remote transmitter;

a memory in which a table is stored, said table including pairs of serial numbers and hopping codes of hopping code control signals as received from the plurality of remote transmitters; and

a control circuit coupled to the actuator, said memory, and said receiver circuit, wherein said control circuit is configured to determine whether the serial number and the hopping code of any received hopping code control signal corresponds to one of the pairs of serial numbers and hopping codes previously stored in said table, said control circuit supplies the activation signal to the actuator when any received hopping code control signal has a serial number and hopping code pair that does not correspond to a serial number and hopping code pair previously stored in said table.

2. The receiver of claim 1, wherein the hopping code control signals received by said receiver circuit are RF signals.

3. The receiver of claim 1, wherein the hopping code of the hopping code control signals are encrypted and said control circuit decrypts the hopping code of the hopping code control signals received by said receiver circuit if the serial numbers correspond to any serial number already stored in said table.

4. The receiver of claim 3, wherein each encrypted hopping code includes specified bits of the corresponding serial number as discrimination bits, and a synchronization counter that changes with each transmission.

5. The receiver of claim 1, wherein said serial numbers are 32-bit serial numbers.

6. An automatic door assembly comprising the receiver of claim 1 and further comprising a door and an actuator for opening and closing said door, said actuator is responsive to an activation signal supplied from said control circuit.

7. A secure system to allow multiple users to remotely open/close a plurality of electronically actuated doors in numerous locations, said system comprising:

a plurality of transmitters, each of said transmitters transmitting open/close door signals including a fixed serial number unique to the transmitter and a hopping code that changes with each transmission; and

a plurality of receivers in electrical communication with said plurality of electronically actuated doors to receive open/close door signals from said transmitters to initiate the opening of said doors in response to the receipt of said open/close door signals, each of said receivers including a memory circuit including a table in which pairs of serial numbers and hopping codes of any received open/close door control signals are stored, and a control circuit coupled to said memory circuit, wherein said control circuit is configured to supply an activation signal to open/close a door when any received open/close door signal has a serial number and hopping code pair that does not correspond to a serial number and hopping code pair previously stored in said table.

8. The system of claim 7, wherein each of said transmitters encrypts the hopping code of the open/close door signals and said control circuit of said receiver decrypts the hopping code of the open/close door signals received by said receiver.

9. The system of claim 8, wherein each encrypted hopping code includes specified bits of the corresponding serial number as discrimination bits, and a synchronization counter that changes with each transmission.

10. The system of claim 9, wherein, if said control circuit determines that appropriate discrimination bits are present and if the serial number of an open/close door signal received by said receiver corresponds to any serial number already stored in said table, said control circuit proceeds to supply an activation signal to open/close a door.

11. The system of claim 9, wherein before said control circuit supplies the activation signal, said control circuit determines whether appropriate discrimination bits are present in the received open/close door signal that corresponds to specified bits of the serial number.