Apparatus for unit control and presence detection
US5581201A · kind A · utility
7Cited by
13References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Oct 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/1732
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital control circuit is constructed to use a single signal line for the dual functions of control and sensing the presence of the controlled device. The control circuit includes a driver element having an output capable of being placed in a high impedance allowing the signal line to be pulled to a first predetermined voltage potential when the controlled device is connected thereto, and a second voltage potential when the controlled device is absent therefrom. A receiver circuit monitors the signal line to sense presence of the one or the other of the voltage potentials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.