Data transmission system and method
US4410985A · kind A · utility
15Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Mar 25, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/423
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A central station and a plurality of transmission stations are connected in cascade by a serial transmission line, and constitute a looped data highway system. The central station controls the whole system. The system allows the transmission station having a data signal transmission request to send out a data signal by means of a normal polling signal, but only the station having sent out the data signal by means of the preceding normal polling signal is allowed to send out the data signal again in response to a retry polling signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.