Re-linked portable data terminal controller system
US4247908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1978 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Dec 8, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0097
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A two-way communications system for use with a host computer includes a control unit, a base station and multiple radio/data terminal units. The control unit interfaces directly with the computer but uses a radio link to the portable units. Voice and data signals can be transmitted and data between units is decoded, sorted, stored, encoded, and sent to its destination in accordance with predetermined protocol in queue discipline. An extensive self-diagnostic system is included. An active redundancy arrangement switches between two control units/base stations on a regular schedule if both units are up, and instantaneously if the "on" unit goes down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.