Three wire interface for field wiring of on/off sensors
US6559653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1999 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Jul 27, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/94
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A three-wire sensor interface for field wiring of conventional on/off type control sensors that delivers power to the sensor, provides a normally open control output from the sensor and, concurrently, provides a normally closed control output from the sensor. The sensor interface includes a plurality of external terminals including a normally open external terminal for electrically connecting to zero, one, or more normally open load devices to control the operation of the normally open load device, and a normally closed external terminal for electrically connecting to zero, one, or more normally closed load devices to control the operation of the normally closed load device. A plurality of interface terminals are preferably electrically coupled between the sensor interface and the sensor and include a normally open control terminal and a normally closed control terminal. The sensor interface further includes an interface circuit adapted to receive the control signals from the sensor subsystem through the normally open and normally closed control terminals and to couple these control signals to the appropriate normally open or normally closed external terminals for controlling the e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.