(19)
(11) EP 0 407 776 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.09.1991 Bulletin 1991/38

(43) Date of publication A2:
16.01.1991 Bulletin 1991/03

(21) Application number: 90111713.5

(22) Date of filing: 21.06.1990
(51) International Patent Classification (IPC)5: G08B 25/10, H05C 3/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 14.07.1989 US 379939

(71) Applicant: COLLMER SEMICONDUCTOR, INC.
Dallas, Texas 75244 (US)

(72) Inventors:
  • Seals, David George
    Dallas, Texas 75214 (US)
  • McDonald, Elzie Monroe, Jr.
    Dallas,Texas 75229 (US)
  • Blair, Herbert Woody, Jr.
    Carrollton, Texas 75006 (US)
  • Tran, Christina Phan
    Carrollton, Texas 75007 (US)

(74) Representative: UEXKÜLL & STOLBERG 
Patentanwälte Beselerstrasse 4
22607 Hamburg
22607 Hamburg (DE)


(56) References cited: : 
   
       


    (54) Radio telemetry monitoring system


    (57) A system to monitor an electric fence or a secured area uses radio telemetry to report faults. The radio telemetry transmitter gathers data from a fence charge sensor, battery voltage sensor and/or switch contacts and encodes this information along with a unique address code in a serial data stream that modulates, by frequency shift keying (FSK), a radio frequency (RF) signal. A radio telemetry receiver intercepts the transmitted RF signal and compares the received address code to a preprogrammed unique address code. If code match occurs the received data is transferred to the appropriate displays. Various faults are reported visually and audibly. Fail-safe timers and error detector circuitry in the radio telemetry and transmitter receiver ensure the integrity of the radio telemetry link.







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