Apparatus for transferring signals and data under the control of a host computer
US4910655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1985 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Aug 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/403
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A communications medium for transmitting data between a plurality of peripheral devices and a host computer. Only one device may talk on the bus at a time and only in response to a command from the host. When a peripheral device needs to be serviced, it sends out a service request signal by holding the bus low after any command signal. The device continues to request service until it receives a talk command from the host computer. When more than one device are the same type (for example, two mice) are coupled to the bus, the host computer assigns new addresses to the devices. Devices detect collisions by sensing a low signal on the bus when they attempt to send a "1".
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.