JPH04150432A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPH04150432A
JPH04150432A JP27211790A JP27211790A JPH04150432A JP H04150432 A JPH04150432 A JP H04150432A JP 27211790 A JP27211790 A JP 27211790A JP 27211790 A JP27211790 A JP 27211790A JP H04150432 A JPH04150432 A JP H04150432A
Authority
JP
Japan
Prior art keywords
data
data communication
transmitter
power line
communication system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27211790A
Other languages
Japanese (ja)
Inventor
Seiji Moriyama
森山　誠司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP27211790A priority Critical patent/JPH04150432A/en
Publication of JPH04150432A publication Critical patent/JPH04150432A/en
Pending legal-status Critical Current

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  • Small-Scale Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To eliminate the need of laying a transmission line separately from a power line by connecting the power line with transmitter-receivers in electrically insulated states and performing communication by using the power line as a transmission line. CONSTITUTION:Connecting means which connect transmitter-receivers 2 with a power line 5 in such a state that they are electrically insulated from each other and signal communication can be performed between them are provided and data communication is performed by using the power line 5 as a transmission line. Namely, each data terminal equipment 1 is connected with each transmitter-receiver 2 and receives communicating status information and receiving data from each transmitter-receiver 2. When a transmittable status is recognized, each equipment 1 sets transmitting data to each transmitter-receiver 2. The transmitter-receivers 2 are respectively connected with photocouplers 3. The photocouplers 3 are connected with the power line 5 through signal lines 4 and perform signal communication by electrically insulating the transmitterreceivers 2 and power line 5 from each other.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

本発明はデータ通信システムに関する。 The present invention relates to data communication systems.

【従来の技術】[Conventional technology]

従来、この種のデータ通信システムは、第２図に示され
るように、電源配線１５から給電を受ける複数のデータ
端末装置１１と、複数のデータ端末装置１１にそれぞれ
接続され、高周波をデータ信号で変調してデータ通信を
行なうための複数の送受信機１２と、各送受信機１２に
信号配線１４を通して接続され、データ通信を行なうた
めの通信専用の伝送路１６とを有する。Conventionally, this type of data communication system, as shown in FIG. 2, includes a plurality of data terminal devices 11 that receive power from a power supply wiring 15, and is connected to each of the plurality of data terminal devices 11, and transmits high frequencies as data signals. It has a plurality of transceivers 12 for performing modulation and data communication, and a transmission path 16 dedicated to communication, which is connected to each transceiver 12 through signal wiring 14 and used for data communication.

【発明が解決しようとする課１ｉ！ｆｉｌ上述した従来
のデータ通信システムは、専用の伝送路１６を使用して
データ通信を行なっていたため、伝送路１６の敷設作業
や接続作業が必要であり、装置の移動や障害発生時の点
検などの保守作業が煩雑であるという欠点がある。 本発明の目的は、通信専用の伝送路を敷設する必要がな
いデータ通信システムを提供することにある。 【課題を解決するための手段】 本発明のデータ通信システムは、電源配線から給電を受
ける複数のデータ端末装置と、前記複数のデータ端末装
置にそれぞれ接続され、高周波をデータ信号で変調して
データ通信を行なうための複数の送受信手段と、を有す
るデータ通信システムに於いて、前記送受信手段と前記
電源配線とを電気的に絶縁された状態で、信号のやり取
りを可能に接続する接続手段を有し、前記電源配線を伝
送路として使用してデータ通信を行なうこと特徴とする
。[Lesson 1i that the invention attempts to solve! filThe conventional data communication system described above performs data communication using a dedicated transmission line 16, which requires installation and connection work of the transmission line 16, which requires equipment movement and inspection in the event of a failure. The disadvantage is that maintenance work is complicated. An object of the present invention is to provide a data communication system that does not require the installation of a transmission path dedicated to communication. [Means for Solving the Problems] A data communication system of the present invention includes a plurality of data terminal devices that receive power from a power supply wiring, each of which is connected to the plurality of data terminal devices, and transmits data by modulating a high frequency with a data signal. A data communication system having a plurality of transmitting/receiving means for communication, further comprising a connecting means for connecting the transmitting/receiving means and the power supply wiring in an electrically insulated state so as to enable signal exchange. The apparatus is characterized in that data communication is performed using the power supply wiring as a transmission path.

【実施例】【Example】

次に、本発明について図面を参照して説明する。 第１図を参照すると、本発明の一実施例によるデータ通
信システムは、複数のデータ端末装置１と、これらデー
タ端末装置１に電源を供給するための電源配線５とを有
する。本発明では、電源配線５を信号の伝送路としても
使用する。 データ端末装置１の各々は、送受信機２と接続されてお
り、送受信機２から通信状態の情報と受信データを受は
取り、送信可能状態であれば、送受信機２への送信デー
タの設定を行なう。 送受信機２は、フォトカプラ３と接続されている。フォ
トカプラ３は、信号配線４を通して電源配線５と接続さ
れていて、送受信機２と電源配線５とを電気的に絶縁し
つつ（８号のやり取りを行なっている。 以下、第３図を参照して、第１図に示されたデータ通信
システムの動作について説明する。 送信側のデータ端末装置１では、電源配線５上のキャリ
ア信号の受信を行い（ステップ２１）、キャリアが検出
されれば（ステップ２２のＹｅｓ）、送信の衝突を避け
るため、キャリアが検出されなくなるまで、ステップ２
１及びステップ２２を繰り返す。キャリアが検出されな
ければ（ステップ２２のＮ　ｏ　）　、送信データの設
定を行い（ステラプ２３）、送信を行う（ステップ２４
）。送信データの終了を判定しくステップ２５）、終了
しない場合は（ステップ２５のＮｏ）、ステップ２１に
戻って送信を続ける。 受信側のデータ端末装置１では、電源配線５上のキャリ
ア信号の受信を行い（ステップ３１）、キャリアが検出
されれば（ステップ３２のＹｅｓ）、受信を行う（ステ
ップ３３）。キャリアが検出されない場合は（ステップ
３２のＮ　ｏ　）　、ステップ３１に戻り、キャリアの
受信を行う。受信したデータが自局宛かどうかの判定を
行い（ステップ３４）、自局宛であれば（ステップ３４
のＹ　ｅ　ｓ）、データの入力を行う（ステップ３５）
。そして、入力データの終了の判定を行う（ステップ３
６）。Next, the present invention will be explained with reference to the drawings. Referring to FIG. 1, a data communication system according to an embodiment of the present invention includes a plurality of data terminal devices 1 and a power supply wiring 5 for supplying power to these data terminal devices 1. In the present invention, the power supply wiring 5 is also used as a signal transmission path. Each of the data terminal devices 1 is connected to a transmitter/receiver 2, receives communication status information and received data from the transmitter/receiver 2, and if it is in a transmittable state, sets transmission data to the transmitter/receiver 2. Let's do it. The transceiver 2 is connected to a photocoupler 3. The photocoupler 3 is connected to the power supply wiring 5 through the signal wiring 4, and conducts communication (No. 8) while electrically insulating the transmitter/receiver 2 and the power supply wiring 5. See Fig. 3 below. The operation of the data communication system shown in Fig. 1 will now be described.The data terminal device 1 on the transmitting side receives a carrier signal on the power supply wiring 5 (step 21), and if a carrier is detected, (Yes in step 22), to avoid transmission collision, step 2 until no carrier is detected.
1 and step 22 are repeated. If no carrier is detected (No in step 22), setting of transmission data is performed (step 23), and transmission is performed (step 24).
). If the end of the transmission data is determined (step 25), and if not (No in step 25), the process returns to step 21 to continue the transmission. The data terminal device 1 on the receiving side receives a carrier signal on the power supply wiring 5 (step 31), and if a carrier is detected (Yes in step 32), reception is performed (step 33). If no carrier is detected (No in step 32), the process returns to step 31 and the carrier is received. It is determined whether the received data is addressed to the own station (step 34), and if it is addressed to the own station (step 34).
Yes), enter data (step 35)
. Then, it is determined whether the input data is finished (step 3).
6).

【発明の効果】【Effect of the invention】

以上説明したように本発明は、電源配線と送受信機とを
電気的に絶縁した状態で接続することにより、電源配線
を伝送路として通信を行うことが可能となり、電源配線
と個別に伝送路を敷設する必要がなくなるという効果が
ある。As explained above, the present invention enables communication to be performed using the power wiring as a transmission path by connecting the power wiring and the transmitter/receiver in an electrically insulated state. This has the effect of eliminating the need for laying.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例によるデータ通信システムを
示すブロック図、第２図は従来のデータ通信システムを
示すブロック図、第３図は第１図に示されたデータ通信
システムの動作を説明するためのフローチャートである
。 １・・・データ端末装置、２・・・送受信機、３・・・
フォトカプラ、４・・・信号配線、５・・・電源配線。FIG. 1 is a block diagram showing a data communication system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional data communication system, and FIG. 3 shows the operation of the data communication system shown in FIG. It is a flow chart for explanation. 1...Data terminal device, 2...Transmitter/receiver, 3...
Photocoupler, 4...signal wiring, 5...power supply wiring.

Claims (1)

【特許請求の範囲】 １、電源配線から給電を受ける複数のデータ端末装置と
、前記複数のデータ端末装置にそれぞれ接続され、高周
波をデータ信号で変調してデータ通信を行なうための複
数の送受信手段と、を有するデータ通信システムに於い
て、 前記送受信手段と前記電源配線とを電気的に絶縁された
状態で、信号のやり取りを可能に接続する接続手段を有
し、前記電源配線を伝送路として使用してデータ通信を
行なうことを特徴とするデータ通信システム。 ２、前記接続手段がフォトカプラである請求項１記載の
データ通信システム。 ３、前記データ端末装置は、前記伝送路の使用状況を判
定する判定手段と、該判定手段の判定結果に基づき、通
信の衝突を回避する衝突回避手段と、を含む請求項１記
載のデータ通信システム。[Claims] 1. A plurality of data terminal devices that receive power from a power supply wiring, and a plurality of transmitting and receiving means connected to the plurality of data terminal devices, respectively, for performing data communication by modulating a high frequency with a data signal. A data communication system comprising: a connecting means for connecting the transmitting/receiving means and the power wiring in an electrically insulated state so as to enable exchange of signals, and using the power wiring as a transmission path. A data communication system characterized in that it is used to perform data communication. 2. The data communication system according to claim 1, wherein the connecting means is a photocoupler. 3. The data communication according to claim 1, wherein the data terminal device includes a determining means for determining the usage status of the transmission path, and a collision avoidance means for avoiding communication collisions based on the determination result of the determining means. system.
JP27211790A 1990-10-12 1990-10-12 Data communication system Pending JPH04150432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27211790A JPH04150432A (en) 1990-10-12 1990-10-12 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27211790A JPH04150432A (en) 1990-10-12 1990-10-12 Data communication system

Publications (1)

Publication Number Publication Date
JPH04150432A true JPH04150432A (en) 1992-05-22

Family

ID=17509328

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27211790A Pending JPH04150432A (en) 1990-10-12 1990-10-12 Data communication system

Country Status (1)

Country Link
JP (1) JPH04150432A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006523393A (en) * 2003-04-08 2006-10-12 エーシーエヌ・アドヴァンスト・コミュニケーションズ・ネットワークス・エスエー System and method for data communication over power lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006523393A (en) * 2003-04-08 2006-10-12 エーシーエヌ・アドヴァンスト・コミュニケーションズ・ネットワークス・エスエー System and method for data communication over power lines
JP4686445B2 (en) * 2003-04-08 2011-05-25 エーシーエヌ・アドヴァンスト・コミュニケーションズ・ネットワークス・エスエー Method for data communication

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