System for communicating messages via a forward overhead control channel for a programmable logic control device
US7151943B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2004 |
| Grant date | Dec 19, 2006 |
| Priority date | — |
| Expiry date | Mar 25, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W8/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Communicating commands and/or data to a remote controller, such as a programmable logic controller, coupled to a cellular communications device. Each cellular communications device can monitor the cellular network control channel for a pair of target pages within a first time period. In the event that a cellular communications device receives target pages having a matching specific identifier, the device will monitor the cellular network control channel over a second time period for at least one command page or data page. The cellular communications device can respond to the reception of one or more command or data pages by forwarding instructions or information to the controller via a communications link. In addition, the cellular communications device can acknowledge receipt of the data or command pages by issuing an acknowledgment signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.