System and method for pendant bud for serially chaining multiple portable pendant peripherals
US6957284B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2002 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Sep 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communications system is arranged for serially chaining multiple portable pendant peripherals to a portable host device. The system enables multiple low power input/output peripherals to communicate over a bi-directional data line with a portable host device such as a PDA or cellular phone. Fixed-length data packets are employed in a store-and-forward approach between the host device and the pendant peripherals. An upstream pendant system component controls a unidirectional clock signal that regulates data transfers to or from the host device and a downstream pendant peripheral. A device identification field associated with the data packet is incremented or decremented as the data packet is forwarded along the pendant bus chain until it reaches its destination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.