Central station to addressed point communication system
US4048620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1974 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Oct 2, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q9/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication system for the transfer of information between a central station and an addressed point has the points organized in decimal groups at different remote stations, and selects a point for communication after enabling the group thereof with a unique station address. The central station equipment produces multiple-level addressing signals in serial sequence appropriate for transmission on a pair of conductors with other signals having a different frequency characteristic. All remote stations can be coupled in common with the central station, but the many points are normally inactive with regard to communication with the central station. An addressed remote station activates a selected point therein for transferring information with the central station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.