Communication protocol for a three nodes system having dedicated connections and bit indicating function of exchanged message
US4947317A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Oct 12, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/40
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication network comprised of a first, second and third controller node. Each of the controller nodes includes a microprocessor for generating and receiving data messages. The first nodes has a transmit pin in line communication with the receive pin of the second nodes and has a receive pin in line communication with the transmit pin of the second node. The third controller receive pin is in line communication with the transmit pin of the first node and its transmit pin is in line communication with the receive pin of the first node. The microprocessors are programmed to respond to and generate suitable formatted data message bytes. The microprocessors are further programmable to respond only to a unique address-command data message byte from the message source node. The microprocessor will then issue a reply message byte to the destination node. The transmitting node will then send a data message. Where the receiving node is the third node, a data message from the third node must then follow. The protocol is software implemented and includes means of detecting a message error and resolving transmission line content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.