Communication system and transmission unit employed in same

Patent metadata

Field	Value
Publication number	US-9548913-B2
Application number	US-201214353340-A
Country	US
Kind code	B2
Filing date	Oct 22, 2012
Priority date	Nov 7, 2011
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

Provided are a communication system that is capable of acquiring information having a relatively large data amount by a transmission unit while securing a communication speed of a transmission signal of transmission unit, and a transmission unit employed in communication system. Transmission unit transmits superimposition requesting data from a superimposition requesting unit to a second monitoring terminal in a transmission segment of transmission signal. Second monitoring terminal, upon receiving superimposition requesting data and with responding thereto, transmits, to transmission unit, monitoring data corresponding to a monitoring input from a sensor device with a superimposition signal superimposed on transmission signal as superimposition response data in a reply segment of transmission signal. Transmission unit, upon receiving superimposition response data composed of monitoring data with a superimposition communication unit, transmits control data to either a second control terminal or a first control terminal associated with this monitoring data in control table.

First claim

The invention claimed is:

1. A communication system comprising:
a transmission unit that repeatedly transmits a transmission signal for communication to a communication line,
a first terminal apparatus that communicates with at least the transmission unit by the transmission signal that conforms to a first protocol; and
a second terminal apparatus that communicates with at least the transmission unit by a superimposition signal that is superimposed on the transmission signal and conforms to a second protocol different from the first protocol, the transmission unit, the first terminal apparatus and the second terminal apparatus being connected to the communication line, and the first terminal apparatus and the second terminal apparatus being separately addressable relative to the transmission unit,
wherein the transmission signal is a time-division signal that is divided, frame by frame, into a plurality of regions in a time axis direction, including:
a transmission segment for transmitting data to the first terminal apparatus; and
a reply segment that is a time slot for receiving response data from the first terminal apparatus, and
wherein the transmission unit includes:
a superimposition requesting unit configured to transmit superimposition requesting data to the second terminal apparatus; and
a superimposition communication unit configured to receive superimposition response data that the second terminal apparatus transmits in the reply segment with the superimposition signal in response to the superimposition requesting data.

2. The communication system according to claim 1 ,
wherein the superimposition requesting unit is configured to transmit the superimposition requesting data to the second terminal apparatus in the transmission segment with the transmission signal, and
the second terminal apparatus includes a terminal apparatus side transmission communication unit configured to receive the superimposition requesting data transmitted with the transmission signal.

3. The communication system according to claim 1 ,
wherein the superimposition requesting unit is configured to transmit the superimposition requesting data to the second terminal apparatus in the reply segment with the superimposition signal.

4. The communication system according to claim 3 ,
wherein the superimposition communication unit is configured to receive the superimposition response data from the second terminal apparatus in the reply segment subsequent to the reply segment in which the superimposition requesting unit transmitted the superimposition requesting data.

5. The communication system according to claim 1 ,
wherein the transmission unit further includes a segment securing unit configured to transmit, with the transmission signal in the transmission segment, securing data for securing the reply segment for superimposition of the superimposition signal, by prohibiting transmission of the response data in the reply segment, with the superimposition requesting data as a trigger.

6. The communication system according to claim 1 ,
wherein the first terminal apparatus includes at least a first control terminal apparatus configured to control one or more first loads based on control data included in the transmission signal that is transmitted from the transmission unit,
the second terminal apparatus includes:
a second monitoring terminal apparatus configured to generate monitoring data having a relatively large data amount in response to the superimposition requesting data from the transmission unit, and transmit the monitoring data to the transmission unit as the superimposition response data; and
a second control terminal apparatus configured to control one or more second loads based on control data included in the superimposition signal that is transmitted from the transmission unit, and
the transmission unit has a control table in which an address of the second monitoring terminal apparatus is associated with an address of the second control terminal apparatus, and determines, with the control table, whether control data generated based on the monitoring data included in the superimposition response data received from the second monitoring terminal apparatus is to be transmitted to the first control terminal apparatus or the second control terminal apparatus.

7. A transmission unit used in a communication system in which the transmission unit, a first terminal apparatus that communicates with at least the transmission unit by a transmission signal for communication, conforming to a first protocol, and a second terminal apparatus that communicates with at least the transmission unit by a superimposition signal superimposed on the transmission signal and conforming to a second protocol different from the first protocol are connected to a communication line, the first terminal apparatus and the second terminal apparatus being separately addressable relative to the transmission unit, the transmission unit comprising:
a transmission communication unit configured to repeatedly transmit, to the communication line, the transmission signal, which is a time-division signal divided, frame by frame, into a plurality of regions in a time axis direction, including a transmission segment for transmitting data to the first terminal apparatus and a reply segment that is a time slot for receiving response data from the first terminal apparatus;
a superimposition requesting unit configured to transmit superimposition requesting data to the second terminal apparatus; and
a superimposition communication unit configured to receive superimposition response data that is transmitted from the second terminal apparatus in response to the superimposition requesting data with the superimposition signal in the reply segment.

8. The communication system according to claim 2 ,
wherein the transmission unit further includes a segment securing unit configured to transmit, with the transmission signal in the transmission segment, securing data for securing the reply segment for superimposition of the superimposition signal, by prohibiting transmission of the response data in the reply segment, with the superimposition requesting data as a trigger.

9. The communication system according to claim 3 ,
wherein the transmission unit further includes a segment securing unit configured to transmit, with the transmission signal in the transmission segment, securing data for securing the reply segment for superimposition of the superimposition signal, by prohibiting transmission of the response data in the reply segment, with the superimposition requesting data as a trigger.

10. The communication system according to claim 4 ,
wherein the transmission unit further includes a segment securing unit configured to transmit, with the transmission signal in the transmission segment, securing data for securing the reply segment for superimposition of the superimposition signal, by prohibiting transmission of the response data in the reply segment, with the superimposition requesting data as a trigger.

Assignees

• Panasonic Corp
• Panasonic Ip Man Co Ltd

Inventors

• Yoshimura Yuichi
• Matsumoto Tadashi
• Sakasegawa Shinji

Classifications

• H04B2203/5454

  Adapter and plugs · CPC title

• H04L43/0876 Primary

  Network utilisation, e.g. volume of load or congestion level · CPC title

• H04B3/58

  Repeater circuits · CPC title

• H04Q9/00 Primary

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H04B2203/5416

  by adding signals to the wave form of the power source · CPC title