JPS617746A - Two-way data communication device for computer - Google Patents

Two-way data communication device for computer

Info

Publication number
JPS617746A
JPS617746A JP59128497A JP12849784A JPS617746A JP S617746 A JPS617746 A JP S617746A JP 59128497 A JP59128497 A JP 59128497A JP 12849784 A JP12849784 A JP 12849784A JP S617746 A JPS617746 A JP S617746A
Authority
JP
Japan
Prior art keywords
computer
computers
transmission
turned
reception
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
JP59128497A
Other languages
Japanese (ja)
Inventor
Naonori Izumi
出水 尚典
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.)
MITAKA KOGYO KK
Original Assignee
MITAKA KOGYO KK
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 MITAKA KOGYO KK filed Critical MITAKA KOGYO KK
Priority to JP59128497A priority Critical patent/JPS617746A/en
Publication of JPS617746A publication Critical patent/JPS617746A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20Repeater circuits; Relay circuits
    • H04L25/26Circuits with optical sensing means, i.e. using opto-couplers for isolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE:To perform data transmission and reception between normal computers even when a computer is faulty, by connecting in parallel photocouplers for reception of each computer with a communication line and, at the same time, providing a transmitting electric wire to each computer. CONSTITUTION:When a transistor switch 12 for transmission is turned on and turned off by means of a main computer 1, an electric current synchronous to the turning on and turning off is made to flow to photocouplers 5 and 6 for reception from a power source 18 for transmission. Therefore, data can be transmitted from the main computer 1 to subordinate computers 2 and 3. In the same way, when the computer 2 turns on and turns off another transistor switch 13 for transmission, the computer 2 can transmit data to the computers 1 and 3. Even if any one of the receiving side computers is set to a condition where the power supply is turned off when the transmitting operation is made, the data transmission and reception between normal computers can be performed without hindrance, because all the photocouplers for reception are connected with the power source for transmission at the transmitting side and, at the same time, turned on and turned off by the transistor switch at the transmitting side.

Description

【発明の詳細な説明】 (技術分野) 本発明はフォトカプラでカレントループを構成してデー
タの送・受信をする=1ンビュータ用双方向データ通信
装置に関する。
DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a two-way data communication device for a single monitor that configures a current loop using a photocoupler to transmit and receive data.

(従来技術) この種の双方向データ通信装置は、例えば第1図に示す
如く構成される。図中、1はメインコンピュータ(ホス
ト・コンピュータ)、2及び3はサブコンピュータであ
る。4.5及び6は受信用フォトカプラ、7,8及び9
は送信用トランジスタスイッチ、10は定電流源、11
は通信線である。全ての受信用コンピュータ及び送信用
トランジスタスイッチはそれぞれのコンピュータに接続
されると共に、それぞれが即ち、4と7.5と8及び6
と9が直列的に接続されている。そして、全ての受信用
フォトカブラと送信用トランジスタスイッチ及び定電流
源10が通信線11で接続されてループを構成している
〈全てが直列的に接続されている)。
(Prior Art) This type of two-way data communication device is configured as shown in FIG. 1, for example. In the figure, 1 is a main computer (host computer), and 2 and 3 are subcomputers. 4.5 and 6 are receiving photocouplers, 7, 8 and 9
is a transmission transistor switch, 10 is a constant current source, 11
is a communication line. All receiving computers and transmitting transistor switches are connected to their respective computers, namely 4, 7.5, 8 and 6 respectively.
and 9 are connected in series. All of the receiving photocouplers, transmitting transistor switches, and constant current source 10 are connected by a communication line 11 to form a loop (all are connected in series).

このような双方向データ通信装置において、データを送
信するとき、ループを構成している送信用トランジスタ
スイッチ7.8及び9がオンの状態にて送信側となるコ
ンピュータ、例えばメインコンピュータ1の送信用トラ
ンジスタスイッチ7をオン・オフする。これにより、受
信用フォトカプラ4,5及び6に(MA又は20mAの
電流が流れるので、受信側となる1ノブコンピュータ2
又は3が自己の受信用フォトカブラの信号を読み込むこ
とによってデータの送・受信が達成される。
In such a two-way data communication device, when transmitting data, the transmitting transistor switches 7, 8 and 9 forming the loop are turned on, and the transmitting side computer, for example, the main computer 1, is turned on. The transistor switch 7 is turned on and off. As a result, a current of MA or 20 mA flows through the receiving photocouplers 4, 5, and 6, so the 1-knob computer 2 on the receiving side
Alternatively, data transmission/reception is achieved by reading the signal of the receiving photocoupler 3.

しかしながら、従来の双方向データ通信装置にあっては
、ループを構成するコンピュータの−いずれかの電源が
オフ(送信用トランジスタスイッチもA)になる)にな
ると、ループが構成されないため、他の正常なコンピュ
ータ同土間におけるデータ通信も不可能になるという問
題があった。
However, in conventional two-way data communication devices, if the power of one of the computers configuring the loop is turned off (the transmitting transistor switch is also set to A), the loop is not configured, and other normal There was a problem in that data communication between computers was also impossible.

(発明の目的) 本発明はこのような点に鑑みてなされたもので、その目
的は、ループを構成づるコンピュータのいずれかに電源
オフの状態が発生したときにおいても、正常なコンピュ
ータ同土間でデータの送・受信を可能にしたコンピュー
タ用双方向データ通信装置を提供するものである。
(Objective of the Invention) The present invention has been made in view of the above points, and its purpose is to ensure that even if one of the computers making up the loop is powered off, the same normal computer remains on the same floor. The present invention provides a two-way data communication device for computers that enables data transmission and reception.

(発明の構成) この目的を達成する本発明は、直列接続の送信用スイッ
チと受信用フォトカプラをコンピュータそれぞれに有し
、通信線を介してデータの送・受信をするコンピュータ
用双方向データ通信装置にトカプラを通信線で並列接続
すると共に、送信用電源を前記コンピュータそれぞれに
備えるような構成としたことを特徴とするものである。
(Structure of the Invention) The present invention achieves this object by providing two-way data communication for computers in which each computer has a transmitting switch and a receiving photocoupler connected in series, and transmits and receives data via a communication line. The present invention is characterized in that a tocoupler is connected in parallel to the device via a communication line, and a transmitting power source is provided in each of the computers.

(実施例) 以下、図面を参照し、本発明の実施例を詳細に説明する
(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第2図は本発明の一実施例を示す構成図である。FIG. 2 is a configuration diagram showing an embodiment of the present invention.

第2図において、第1図と同一部分には同一符号を付し
その説明は省略する。12.13及び14は、フォトカ
ブラ15.16及び17それぞれによって駆動される送
信用トランジスタスイッチで、各コンピュータの受信用
フォトカプラそれぞれと、即ち4と12.5と13及び
6と14が直列接続されると共に、各コンピュータから
の送信用データによって動作する構成となっている。又
、各コンピュータの受信用フォトカプラ4,5及び6は
同軸ケーブル、ツイストペア線等の通信線11で並列接
続される構成となっている。18.19及び20は送信
用電源で、各コンピュータにおいて、受信用フォトカプ
ラと送信用トランジスタスイッチの直列回路に電流を供
給するようになっている。
In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and their explanations will be omitted. 12.13 and 14 are transmitting transistor switches driven by photocouplers 15.16 and 17, respectively, and the receiving photocouplers of each computer, that is, 4, 12.5, 13, and 6 and 14 are connected in series. It is configured to operate based on transmission data from each computer. Further, the receiving photocouplers 4, 5, and 6 of each computer are connected in parallel through a communication line 11 such as a coaxial cable or a twisted pair wire. Reference numerals 18, 19, and 20 are transmitting power supplies, which supply current to a series circuit of a receiving photocoupler and a transmitting transistor switch in each computer.

このような双方向データ通信装置において、通常、送信
用トランジスタスイッチ12.13及び14はオフにな
っている。そして、メインコンピュータ1からデータを
他のコンピュータに送信するとき、メインコンピュータ
1により送信用トランジスタスイッチ12をオン・オフ
すると、受信用フォトカプラ5及び6(勿論4も)には
、前記オン・オフに同期する電流が送信用電源18から
流れる。これにより、メインコンピュータ1からデータ
をザブコンピュータ2及び3に送信することができる。
In such a two-way data communication device, the transmitting transistor switches 12, 13 and 14 are normally turned off. When transmitting data from the main computer 1 to another computer, when the main computer 1 turns on/off the transmitting transistor switch 12, the receiving photocouplers 5 and 6 (of course 4) are turned on/off. A current synchronized with the transmission power supply 18 flows from the transmission power supply 18. Thereby, data can be transmitted from the main computer 1 to the subcomputers 2 and 3.

又、同様に、サブコンピュータ2が送信用トランジスタ
スイッチ13をオン・オフすることにより、メインコン
ビl−夕1及びサブコンピュータ3にデータを送信する
ことができる。
Similarly, the subcomputer 2 can transmit data to the main computer 1 and the subcomputer 3 by turning on and off the transmission transistor switch 13.

この送信動作のとき、受信側のコンピュータのいずれか
が電源オフの状態にあっても、全ての受信用フォトカプ
ラが送信側の送信用電源に接続されると共に、送信側の
送信用トランジスタスイッチによってオン・オフされる
ため正常なコンピュータ同土間のデータの送・受信に支
障を来たすことがない。
During this transmission operation, even if one of the computers on the receiving side is powered off, all the receiving photocouplers are connected to the transmitting power supply on the sending side, and the transmitting transistor switch on the sending side Since it is turned on and off, there is no problem with normal data transmission and reception between computers.

(発明の効果) 以上説明したように、本発明によれば、各コンピュータ
の受信用フォトカプラを通信線で並列接続すると共に、
送信用電源を各フンピユータに備える構成としたため、
ループを構成するコンピュータのいずれかに電源オフの
状態が発生したとぎにおいても、正常なコンピュータ同
土間でデータの送・受信をすることができ、かつ、長距
離間におけるデータの送・受信も実現できる。
(Effects of the Invention) As explained above, according to the present invention, the receiving photocouplers of each computer are connected in parallel through communication lines, and
Since the power supply for transmission is provided in each unit,
Even if one of the computers that make up the loop is powered off, data can be sent and received between the same computer, and data can also be sent and received over long distances. can.

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

第1図は従来例を示す構成図、第2図は本発明の一実施
例を示す構成図である。 1・・・メインコンピュータ 2.3・・・サブコンピュータ 4.5.6・・・受信用フォトカプラ 11・・・通信線 12.13.14・・・送信用トランジスタスイッチ1
8.19.20・・・送信用電源 尼1図
FIG. 1 is a block diagram showing a conventional example, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1...Main computer 2.3...Sub computer 4.5.6...Receiving photocoupler 11...Communication line 12.13.14...Transmitting transistor switch 1
8.19.20... Transmission power supply diagram 1

Claims (1)

【特許請求の範囲】[Claims] 直列接続の送信用スイッチと受信用フォトカプラをコン
ピュータそれぞれに有し、通信線を介してデータの送・
受信をするコンピュータ用双方向データ通信装置におい
て、前記コンピュータそれぞれの受信用フォトカプラを
通信線で並列接続すると共に、送信用電源を前記コンピ
ュータそれぞれに備えるような構成としたことを特徴と
するコンピュータ用双方向データ通信装置。
Each computer has a series-connected transmission switch and reception photocoupler, and data can be sent and received via communication lines.
A two-way data communication device for a computer that receives data, characterized in that receiving photocouplers of each of the computers are connected in parallel via a communication line, and each of the computers is provided with a power source for transmission. Two-way data communication device.
JP59128497A 1984-06-22 1984-06-22 Two-way data communication device for computer Pending JPS617746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59128497A JPS617746A (en) 1984-06-22 1984-06-22 Two-way data communication device for computer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59128497A JPS617746A (en) 1984-06-22 1984-06-22 Two-way data communication device for computer

Publications (1)

Publication Number Publication Date
JPS617746A true JPS617746A (en) 1986-01-14

Family

ID=14986203

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59128497A Pending JPS617746A (en) 1984-06-22 1984-06-22 Two-way data communication device for computer

Country Status (1)

Country Link
JP (1) JPS617746A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937656A (en) * 1988-04-22 1990-06-26 Mitsubishi Denki Kabushiki Kaisha Semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937656A (en) * 1988-04-22 1990-06-26 Mitsubishi Denki Kabushiki Kaisha Semiconductor device

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