Interface circuit for communicating between two data highways
US4047162A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Apr 28, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4213
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interface circuit for use in a data transmission system is designed to be used not only between a highway and a device but also to link highways and can be commanded to enter a status in which commands sent to it on one highway are modified and sent out as commands on a second highway so that a controller device on the one highway can control devices not only on that highway but also on the second highway, with extension, if desired, to a third highway or beyond. To achieve this, the interface circuit has two ports each for connection to a respective one of two substantially identical highways, and status control means responsive to signals received at either port to establish different statuses of the interface. For inter-highway communication, the status control means is responsive to a command signal of particular form at either port to produce a modified command signal at the other port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.