System for reverse data transmission flow control wherein command is transferred by asynchronous transfer mode while data is transferred by isochronous transfer mode
US6334161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1998 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Feb 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/33378
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A host computer logs in an image providing device such as a scanner connected by a serial bus, and reverses flow control of data transfer by issuing a Reverse command. The image providing device opens a transfer channel by an OpenChannel command, transfers image data in form of blocks. When the transfer of the image data has been completed, the image providing device closes the transfer channel by a CloseChannel command, and reverses the flow control of the data transfer again by the Reverse command. This changes the data transfer direction of a device having a bi-directional data transfer function, i.e., a device having a data reception function and a data providing function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.