(19)

(11)

EP 0 617 823 A1

(12)

(43) Date of publication: 05.10.1994 Bulletin 1994/40 (21) Application number: 93902790.0 (22) Date of filing: 18.12.1992

(51) International Patent Classification (IPC):  G08B 25/ 04( . ) H04L 12/ 28( . ) G08B 19/ 00( . ) H04Q 9/ 00( . ) (86) International application number: PCT/US1992/011262 (87) International publication number: WO 1993/013507 (08.07.1993 Gazette 1993/16)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 20.12.1991 US 19910811508 (71) Applicant: HONEYWELL INC. Minneapolis Minnesota 55408 (US)	(72) Inventors: WALD, William, M. Laguna Niguel, CA 92622 (US) GREGORY, Ronald, B. Garden Grove, CA 92643 (US) (74) Representative: Fox-Male, Nicholas Vincent Humbert  Honeywell Control Systems Limited, Honeywell House, Arlington Business Park Bracknell, Berkshire RG12 1EB Bracknell, Berkshire RG12 1EB (GB)