Electrically programmable transceiver security system and integrated circuit
US4859990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1987 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Apr 15, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electrically programmable security system includes a receiver responsive to particular radio frequency signals which include a predetermined digital code encoded on the radio frequency signal. The receiver generates a control signal upon detecting the presence of the encoded radio frequency signal. The receiver also includes a circuit for digitally communicating the predetermined digital code on a communication link. A transmitter includes a memory for storing a digital code and a circuit for generating a radio frequency signal at the radio frequency to which said receiver is responsive. The radio frequency signal generated by the transmitter is encoded with the digital code stored in the memory. The transmitter further includes a circuit for coupling with the communication link and a circuit for inputting the predetermined digital code from the receiver unit communicated on the communication link into the memory when the communication link is coupled to the coupling circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.