| US 7,449,990 B2 | ||
| Communication protocol for interconnected hazardous condition detectors, and system employing same | ||
| John J. Andres, Colorado Springs, Colo. (US); Michael W. Apperson, Chapel Hill, N.C. (US); Joseph G. DeLuca, Colorado Springs, Colo. (US); Chris R. Gilbert, Colorado Springs, Colo. (US); Craig Kleinberg, Colorado Springs, Colo. (US); Larry Ratzlaff, Elgin, Ill. (US); Stephen M. Ernst, Colorado Springs, Colo. (US); and John Wurtenberger, Colorado Springs, Colo. (US) | ||
| Assigned to Walter Kidde Portable Equipment, Inc., Mebane, N.C. (US) | ||
| Filed on May 17, 2004, as Appl. No. 10/849,366. | ||
| Application 10/849366 is a continuation of application No. 09/638091, filed on Aug. 11, 2000, granted, now 6,791,453. | ||
| Prior Publication US 2005/0007248 A1, Jan. 13, 2005 | ||
| Int. Cl. G09F 25/00 (2006.01) | ||
| U.S. Cl. 340—286.01 [340/639; 340/693.6; 340/516; 340/289] | 24 Claims |
| 1. A method of communicating multiple hazardous condition alarms between distributed hazardous condition detectors over a
single signal line, at least one of the hazardous condition detectors having circuitry configured to detect and distinguish
a first signal including a voltage pulse from a second signal including a constant voltage received over the single signal
line, the method comprising the steps of:
sensing a first hazardous environmental condition; and
generating an alarm signal on the single signal line upon sensing the first hazardous environmental condition, the alarm signal
comprising at least one voltage pulse.
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