Circuit for interfacing between an external signal and control apparatus
US4197471A · kind A · utility
12Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1977 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Sep 29, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/7955
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input/output interface for a digital controller including an optical isolator coupling an input portion which formats an external signal to make it compatible with the optical isolator and an output portion comprising an RC network connected to a threshold detector with hysteresis to provide a filtered output logic signal in addition to an accompanying audio or visual signal. The interface, with slight modifications can be used with either DC or AC external signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.