JPS608668B2 - data transmission circuit - Google Patents
data transmission circuitInfo
- Publication number
- JPS608668B2 JPS608668B2 JP56041527A JP4152781A JPS608668B2 JP S608668 B2 JPS608668 B2 JP S608668B2 JP 56041527 A JP56041527 A JP 56041527A JP 4152781 A JP4152781 A JP 4152781A JP S608668 B2 JPS608668 B2 JP S608668B2
- Authority
- JP
- Japan
- Prior art keywords
- data
- transmission line
- circuit
- processing unit
- photocoupler
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation
Landscapes
- Engineering & Computer Science (AREA)
- Small-Scale Networks (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
Description
【発明の詳細な説明】
本発明は中央データ処理装置に伝送ラインを介して端末
装置を直列接続したデータ伝送回路に係り、特に前記端
末装置を複数直列接続した場合その中の１の故障によっ
て他の端末も使用できなくなるのを未然に防止し得るデ
ータ伝送回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission circuit in which terminal devices are connected in series to a central data processing unit via a transmission line, and in particular, when a plurality of terminal devices are connected in series, a failure in one of the terminal devices can cause a failure in the other terminal devices. The present invention relates to a data transmission circuit that can prevent terminals from becoming unusable.
従来の伝送回路には、中央データ処理装置（所謂ホスト
コンピュータ）と複数の端末装置（夕−ミナル）を並列
に伝送ラインによって並列接続するキキャン方式と中央
データ処理装置に伝送ラインを介して複数の端末装置を
直列に接続するボーリング方式とがある。Conventional transmission circuits include the quick-can system, in which a central data processing unit (so-called host computer) and multiple terminal devices (terminals) are connected in parallel via a transmission line, and the central data processing unit, in which multiple terminals are connected in parallel via a transmission line. There is a boring method in which terminal devices are connected in series.
前者は各端末装置を順次切換える必要があり、構成が複
雑になる欠点があり、例えば各種データを多数の末端装
置に同時に送信するには極めて不同であった。The former method requires sequential switching of each terminal device, which has the disadvantage of complicating the configuration. For example, it is extremely difficult to transmit various types of data to a large number of terminal devices at the same time.
そこで後者の方式が各種データを多数の端末装置に中央
データ処理装置から送信する場合に多く採用されており
、第１図に示すように中央データ処理装置１から伝送ラ
イン２に対してデータを送信するものである。Therefore, the latter method is often adopted when various types of data are transmitted from a central data processing unit to a large number of terminal devices, and as shown in Figure 1, data is transmitted from a central data processing unit 1 to a transmission line 2. It is something to do.
この場合各端末装置３，４，５には各々発光ダイオード
６，７，８及びフオトトランジスタ９，１０，１１を有
するフオトカプラ１２，１３，１４が設けられており、
該フオトトランジスタ９，１０，１１は各々負荷抵抗１
５，１６，１７によって出力はィンバータ１８，１９，
２０を介して２１，２２，２３に各々受信出力が得られ
る。In this case, each terminal device 3, 4, 5 is provided with a photocoupler 12, 13, 14 having a light emitting diode 6, 7, 8 and a phototransistor 9, 10, 11, respectively.
The phototransistors 9, 10, 11 each have a load resistance 1
5, 16, 17, the output is inverter 18, 19,
Reception outputs are obtained through 20 at 21, 22, and 23, respectively.
ところが前記第１図の構成では仮に＃１の端末装置３内
のフィトカプラ１２が何らかの原因で破壊すると、前記
伝送ライン２はオープンになってしまい、＃１のみなら
ず＃２及び＃３の端末装置４，５もデータが伝送されず
、従って中央データ処理装置１からデータ伝送ライン２
に送信したとしても、端末装置３，４，６に前記デー外
ま伝送されず、受信することが不可能となり、更にオペ
レータはどの端末装置が破壊しているのか即座には知り
得なかった。そこで本発明は前記欠点を除去した新規な
データ伝送回路を提供するもので、以下図面に従って説
明する。However, in the configuration shown in FIG. 1, if the phytocoupler 12 in the terminal device 3 of #1 were to break for some reason, the transmission line 2 would become open, and not only the terminal devices #1 but also the terminal devices #2 and #3 would be damaged. 4 and 5, no data is transmitted either, and therefore from the central data processing unit 1 to the data transmission line 2.
Even if the data is sent to the terminal devices 3, 4, and 6, the data is not transmitted to the terminal devices 3, 4, and 6, making it impossible to receive the data, and furthermore, the operator cannot immediately know which terminal device is being destroyed. Therefore, the present invention provides a new data transmission circuit that eliminates the above-mentioned drawbacks, and will be described below with reference to the drawings.
第２図は本発明のデータ伝送回路に用いる端末装置を示
し、該端末装置２４は伝送ライン２を介して、第１図と
同機に中央データ処理装置に接続される。FIG. 2 shows a terminal device used in the data transmission circuit of the invention, which terminal device 24 is connected to the central data processing unit via the transmission line 2 in the same manner as in FIG.
次に本発明回路の動作について説明すると、正常動作時
、データは発光ダイオード２５及びフオトトランジスタ
２６を有するフオトカプラ２７に加わった後、インバー
夕２８を介してＯＲゲート２９に加わり、端子３０から
出力Ｖｏが得られる。Next, the operation of the circuit of the present invention will be explained. During normal operation, data is applied to a photocoupler 27 having a light emitting diode 25 and a phototransistor 26, then applied to an OR gate 29 via an inverter 28, and outputted from a terminal 30 to an output Vo. is obtained.
この場合発光ダイオード３１及びフオトトランジスタ３
２を有するフオトカプラ３３には直列に表示用発光ダイ
オード３４が接続されており、該発光ダイオード３４は
オンになるだけの電圧が加わらないので従ってオフ状態
に保持されている。In this case, a light emitting diode 31 and a phototransistor 3
A display light-emitting diode 34 is connected in series to the photocoupler 33 having the photocoupler 2, and since a voltage sufficient to turn it on is not applied to the light-emitting diode 34, the light-emitting diode 34 is held in an off state.
又伝送ライン２の直流電流は第３図に示すように無信号
時／・ィレベルＨ」（一例として２仇ｈＡ）、信号印加
時ローレベルＬ」（一例として■ｈＡ）に設定されてい
る。次にフオトカプラ２７が何れかの原因で破壊された
ときは、フオトカプラ２７側はオープンになるので、伝
送ライン２からフオトカプラ３３に電流が加わることに
なる。Further, as shown in FIG. 3, the direct current of the transmission line 2 is set to a high level (2 hA as an example) when there is no signal and to a low level L (2 hA as an example) when a signal is applied. Next, when the photocoupler 27 is destroyed for any reason, the photocoupler 27 side becomes open, and current is applied from the transmission line 2 to the photocoupler 33.
従って無信号状態には前述の通り伝送ライン２の直流電
流が／・ィレベル（Ｈ）になっているので、表示用発光
ダイオード３４に直流電流が加わって点灯し、フオトカ
プラ２７の破壊をオペレータに知らせると共に、伝送ラ
イン２からの送信デ一外まフオトカプラ３３によって受
信するように指示と共に表示せしめることができ、所定
のデータが伝送ライン２を介してフオトカプラ３３に加
わった後、ィンバータ３５によって反転された前記デー
タはＯＲゲート２９を通して端子３０から出力Ｖｏとし
て現われる。Therefore, in the no-signal state, the DC current in the transmission line 2 is at the level (H) as described above, so a DC current is applied to the display light emitting diode 34 and it lights up, notifying the operator that the photocoupler 27 has been destroyed. At the same time, the transmission data from the transmission line 2 can be displayed together with an instruction to be received by the photocoupler 33, and after the predetermined data is applied to the photocoupler 33 via the transmission line 2, it is inverted by the inverter 35. Said data passes through OR gate 29 and appears at terminal 30 as output Vo.
前述の第２図に示す端末装置を伝送ラインに複数直列接
続した場合、前述の説明の破壊したフオトカプラの設け
られている端末装置の表示用発光ダイオードが無信号時
点灯することになる。When a plurality of the terminal devices shown in FIG. 2 described above are connected in series to a transmission line, the display light emitting diode of the terminal device equipped with the destroyed photocoupler described above will light up when there is no signal.
尚図中３６は負荷抵抗３７は直流電源端子を示す。ここ
で前記表示用ダイオードは端末装置の前面に設ければ、
フオトカプラの破壊をオペレータに直ちに感知せしめる
ことができる。以上の様に本発明によれば、ボーリング
方式のデータ伝送回路において、端末装置内の伝送ライ
ンに接続される結合手段の破壊時即座にバックアップで
きると共に該破壊をオペレー外こ知らしめる表示手段を
備えているので、オペレータとして、複数直列接続した
端末装置のの中のいずれの結合手段が破壊したのかを直
ちに知ることがきる利点が得られる。In the figure, numeral 36 indicates a load resistor 37 and a DC power supply terminal. Here, if the display diode is provided on the front of the terminal device,
The operator can immediately sense the destruction of the photocoupler. As described above, according to the present invention, a boring type data transmission circuit is provided with a display means that can immediately back up when a coupling means connected to a transmission line in a terminal device is destroyed, and also informs the outside of the operator of the destruction. Therefore, as an operator, there is an advantage that it is possible to immediately know which coupling means among a plurality of serially connected terminal devices has broken.
第１図は従来のデータ伝送回路、第２図は本発明の同回
路に用いる端末装置の一実施例、第３図は本発明の説明
波形図を示す。
主な図番の説明、１・・・中央データ処理装置、２・・
・伝送ライン、１２，１３，１４，２７，３３・・・フ
オトカプラ、１５，１６，１７，３６・・・負荷抵抗、
２９・・・ＯＲゲート。
ａ；１凶
節２図
第３図FIG. 1 shows a conventional data transmission circuit, FIG. 2 shows an embodiment of a terminal device used in the same circuit according to the present invention, and FIG. 3 shows an explanatory waveform diagram of the present invention. Explanation of main drawing numbers, 1...Central data processing unit, 2...
・Transmission line, 12, 13, 14, 27, 33... Photo coupler, 15, 16, 17, 36... Load resistance,
29...OR gate. a; 1 evil knot 2 figure 3 figure
Claims (1)
データ処理装置に直列接続された端末装置と、前記中央
データ処理装置と端末装置との間でデータを伝送する伝
送ラインとより成り、前記伝送ラインに結合されたデー
タ受信用の第１の結合手段に並列に、第２の結合手段と
発光素子とを有する直列回路を接続し、前記第１及び第
２の結合手段の出力側を論理和回路を通して受信回路に
接続したことを特徴とするデータ伝送回路。 ２ 特許請求の範囲第１項において、第１及び第２の結
合手段にフオトカプラ、発光素子に発光ダイオードを用
いたことを特徴とするデータ伝送回路。[Claims] 1. A central data processing unit in which data is stored, a terminal device connected in series to the central data processing unit, and a transmission line for transmitting data between the central data processing unit and the terminal device. A series circuit having a second coupling means and a light emitting element is connected in parallel to the first coupling means for data reception coupled to the transmission line, and the first and second coupling means A data transmission circuit characterized in that the output side of the circuit is connected to a receiving circuit through an OR circuit. 2. A data transmission circuit according to claim 1, characterized in that a photocoupler is used as the first and second coupling means, and a light emitting diode is used as the light emitting element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041527A JPS608668B2 (en) | 1981-03-20 | 1981-03-20 | data transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041527A JPS608668B2 (en) | 1981-03-20 | 1981-03-20 | data transmission circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57155863A JPS57155863A (en) | 1982-09-27 |
| JPS608668B2 true JPS608668B2 (en) | 1985-03-05 |
Family
ID=12610866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56041527A Expired JPS608668B2 (en) | 1981-03-20 | 1981-03-20 | data transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608668B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59196053U (en) * | 1983-06-15 | 1984-12-26 | 三菱農機株式会社 | Straw processing equipment in combine harvester |
| CN111442815B (en) * | 2019-01-17 | 2023-12-01 | 上海树诚实业有限公司 | Wide-range isotope liquid level detection synthetic circuit |
-
1981
- 1981-03-20 JP JP56041527A patent/JPS608668B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57155863A (en) | 1982-09-27 |
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