Simultaneous data and electric power transmitting/receiving system

Patent 5003457 Issued on March 26, 1991. Estimated Expiration Date:

December 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3924224

Electrical wiring system
Patent #: 3944981
Issued on: 03/16/1976
Inventor: Akita , et al.

Time division multiplex transmission system in which electrical power is transmitted to remote terminals from a central unit simultaneously with address and control signals
Patent #: 4139737
Issued on: 02/13/1979
Inventor: Shimada , et al.

Electronic multiple device control system
Patent #: 4163218
Issued on: 07/31/1979
Inventor: Wu

System for displaying at a remote station data generated at a central station and for powering the remote station from the central station
Patent #: 4228422
Issued on: 10/14/1980
Inventor: Perry

Point-of-manufacture data acquisition system Patent #: 4408291
Issued on: 10/04/1983
Inventor: Gunzberg , et al.

Inventors

Assignee

Hitachi Chemical Company, Ltd.

Application

No. 291135 filed on 12/28/1988

US Classes:

700/4Parallel

Examiners

Primary: MacDonald, Allen R.

Attorney, Agent or Firm

Jones, Askew & Lunsford

International Classes

G06F 001/00
H04L 001/00

Foreign Application Priority Data

1987-12-29 JP

Abstract

A data and power transmitting/receiving system applicable to a home automation system. Plural terminal units and associated communication units are connected via a common signal bus. Each terminal unit may operate an electrical load to be controlled remotely, and may include control switches for operating such loads at a number of remote locations. Each communication unit generates an n-bit data signal, each bit corresponding to the desired function of a corresponding terminal unit. A sync signal is combined with the data signal in time sequence such that the respective communication units can identify which signal operates which terminal unit. The sync signals also can supply DC power to ther respective communication units.