Infrared communication port fax software legacy flow control emulation
US5923443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Jan 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0053
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A new functionality in a fax communication system including a PC with a virtual data port (DTE) and a fax modem (DCE), having an infrared (IR) connection between them, wherein the DCE is capable of indicating to the local infrared communications, i.e., IrDA IrCOMM, port or interface the type of the software flow control, either local or end-to-end, so that the local and the remote IrCOMM ports can be made to function such that: ______________________________________ IF an XON/XOFF character is received from the client AND the mode is end-to-end AND the SW flow control is enabled, THEN the XON/XOFF character is handled as flow control and the character is transmitted to the host IrCOMM. ______________________________________ A new interface primitive at the interface of the IrCOMM in the DCE requests the desired mode and if the desired mode is "local", the XON/XOFF characters are not transmitted to the host system when SW flow control is active. When the mode is "end-to-end", then the XON/XOFF characters are always transmitted to the host system regardless of the SW flow control state. A new control channel parameter inside the local IrCOMM indicates the change of the SW flow contro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.