JPS5827706B2 - Receiver of transmitting and receiving system - Google Patents
Receiver of transmitting and receiving systemInfo
- Publication number
- JPS5827706B2 JPS5827706B2 JP54058549A JP5854979A JPS5827706B2 JP S5827706 B2 JPS5827706 B2 JP S5827706B2 JP 54058549 A JP54058549 A JP 54058549A JP 5854979 A JP5854979 A JP 5854979A JP S5827706 B2 JPS5827706 B2 JP S5827706B2
- Authority
- JP
- Japan
- Prior art keywords
- receiver
- transformer
- transmission line
- transmitting
- secondary side
- 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
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Small-Scale Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】
この発明は多数の局間でデータの送受を行なうデータ伝
送システムにお−ける受信局に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving station in a data transmission system that transmits and receives data between a large number of stations.
第１図に示すようにデータ伝送システムは伝送ライン１
に送信局あるいは受信局（３，４・・・・・・１０）が
多数並設され、この受信局は制御装置２０指令にもとづ
いて指定の送信局から指定の受信局にデータを伝送する
ものである。As shown in Figure 1, the data transmission system consists of transmission line 1.
A large number of transmitting stations or receiving stations (3, 4...10) are installed in parallel, and this receiving station transmits data from a designated transmitting station to a designated receiving station based on commands from the control device 20. It is.
このデータ伝送システムにおいて、従来の受信局は第２
図のように構成されていた。In this data transmission system, the conventional receiving station is
It was configured as shown in the figure.
すなわち、伝送ライン１にトランス１１を介してし・ン
ーバ１３が接続され、伝送ライン１を介して送られる高
周波電圧を受信する。That is, the amplifier 13 is connected to the transmission line 1 via the transformer 11 and receives the high frequency voltage sent via the transmission line 1.
ここでトランス１１の２次側にはマツチング抵抗１２が
接続されている。Here, a matching resistor 12 is connected to the secondary side of the transformer 11.
従来のこのような構成のデータ伝送システムにお−いて
は次のような欠点がある。The conventional data transmission system having such a configuration has the following drawbacks.
すなわち、伝送路の片側がはずれた場合トランス１１の
１次側インピーダンスが高いので１次巻線がアンテナの
ような作用をなし、このトランス１１の２次側に誘導電
圧を発生して伝送路１の信号がレシーバ１３に加わりレ
シーバ１３はこれを受信してし１う。That is, if one side of the transmission line is disconnected, the primary winding of the transformer 11 acts like an antenna because the impedance on the primary side is high, and an induced voltage is generated on the secondary side of the transformer 11, causing the transmission line 1 to become disconnected. The signal is applied to the receiver 13, and the receiver 13 receives this signal.
伝送路の片側がはずれて誤信号であるにもかかわらず信
号とみなして検出してし１う誤動作が生じるのである。When one side of the transmission path is disconnected, a malfunction occurs in which the signal is detected as a signal even though it is an erroneous signal.
この誤動作を解消するには、マツチング抵抗１２を小さ
くすることが考えられる。In order to eliminate this malfunction, it is conceivable to reduce the size of the matching resistor 12.
しかしながら、このマツチング抵抗１２を小さくするこ
とは、トランスの１次側からみた受信機のインピーダン
スを小さくすることになる。However, reducing the matching resistor 12 reduces the impedance of the receiver as seen from the primary side of the transformer.
１次側インピーダンスが小さくなることは伝送路にたく
さんの受信機を接続できないということになり、逆にい
えばたぐさんの受信機と接続する場合には送信器の出力
をあげなければならないということを意味する。A decrease in primary impedance means that it is not possible to connect many receivers to the transmission line, and conversely, when connecting to many receivers, the output of the transmitter must be increased. means.
したがって、たくさんの受信機を接続し、送信器の出力
も小さいものを使用するなら、マツチング抵抗をあ１り
小さくすることはできない。Therefore, if a large number of receivers are connected and a transmitter with a small output is used, the matching resistance cannot be made any smaller.
この発明は上述の問題にがんがえてなされたもので、そ
の目的はマツチング抵抗として大きいものが使用でき、
しかも、伝送路が伺らかの原因で外れた場合でも誤動作
を生じない送受信システムの受信機を提供することにあ
る。This invention was made in response to the above-mentioned problem, and its purpose is to use a large matching resistor.
Moreover, it is an object of the present invention to provide a receiver for a transmitting/receiving system that does not malfunction even if the transmission line is disconnected for some reason.
この目的のために、この発明は、要約すれば伝送路に接
続されるトランスの２次側の一端とこのトランスからの
信号を受信するレシーバとの間に介在される逆並列接続
したダイオードと、このダイオードの出力側とトランス
の２次側の他端とに接続されたサーミスタを含む温度補
償回路を備えた構成を採用している。For this purpose, the present invention can be summarized as follows: diodes connected in antiparallel and interposed between one end of the secondary side of a transformer connected to a transmission line and a receiver receiving a signal from the transformer; A configuration including a temperature compensation circuit including a thermistor connected to the output side of this diode and the other end of the secondary side of the transformer is adopted.
この構成を採用することにより、伝送路の片側が外れた
場合、伝送路を介して送られる信号を指定された受信局
は受信せず、′伝送の受信ミスを未然に防止できる効果
がある。By employing this configuration, if one side of the transmission line is disconnected, the designated receiving station will not receive the signal sent through the transmission line, and this has the effect of preventing transmission reception errors.
第３図はこの発明の一実施例を示す受信局の回路図であ
る。FIG. 3 is a circuit diagram of a receiving station showing an embodiment of the present invention.
この実施例は番２図の従来例とほぼ同一であるが、トラ
ンス１１の２次巻線とレシーバ１３との間に逆並列接続
したダイオード１４，１５、サー□スタ１６、抵抗１７
が接続されている点で異なる。This embodiment is almost the same as the conventional example shown in FIG.
They differ in that they are connected.
この実施例では抵抗１２の値を充分に高くとり、伝送ラ
イン１に多数の送受信局が並設されてもレシーバの受信
には影響が出ないように考慮されている。In this embodiment, the value of the resistor 12 is set sufficiently high so that even if a large number of transmitting/receiving stations are installed in parallel on the transmission line 1, reception by the receiver will not be affected.
伝送ライスの片側が外れていない正常の状態にかいて、
データが伝送されている状態でトランス１１の２次側に
は２■程度の高周波信号が発生しこれは、ダイオード１
４．１５を介してレシーバ１３で検知される。Under normal conditions with one side of the transmission rice not coming off,
While data is being transmitted, a high frequency signal of about 2 mm is generated on the secondary side of the transformer 11, and this is caused by the diode 1.
4.15 and is detected by the receiver 13.
い１伝送路の片側が外れたとする。Suppose that one side of the transmission line is disconnected.
この場合、トランスの２次側には０．３ Ｖ程度の信号
に落ちてし１うことが実験的に認められた。In this case, it has been experimentally confirmed that the signal drops to about 0.3 V on the secondary side of the transformer.
２次側の高周波信号のピーク値が０．３ Ｖになると周
知のと釦りダイオードには０．５Ｖ程度のスレショルド
レベルが存在するのでこの値を越えることができない。When the peak value of the high-frequency signal on the secondary side reaches 0.3 V, the well-known Tobutsu diode has a threshold level of about 0.5 V, so it cannot exceed this value.
受信局にはＩＶ程度の入力信号を受信するように設計さ
れてかり、したがって伝送ラインの片側が外れた場合、
伝送ライン１からの伝送信号はレシーバ１３で受信され
ず、異常が生じた場合の信号受信は行なわれず誤動作を
未然に防止できる。The receiving station is designed to receive an input signal of about IV, so if one side of the transmission line becomes disconnected,
The transmission signal from the transmission line 1 is not received by the receiver 13, and even if an abnormality occurs, signal reception is not performed, and malfunctions can be prevented.
サー□スタ１６と抵抗１７はダイオード１４の温度補償
の役目をする。The resistor 16 and the resistor 17 serve to compensate for the temperature of the diode 14.
ダイオードのスレッショルドレベルは温度上昇とともに
低下していく。The threshold level of the diode decreases with increasing temperature.
この低下が生じると、伝送路の片側が外れた場合、伝送
ライン１からの伝送信号がレシーバ１３で受信されると
いう誤動作が生じる。When this decrease occurs, a malfunction occurs in which the transmission signal from the transmission line 1 is received by the receiver 13 if one side of the transmission line is disconnected.
これを防ぐにはトランスの２次側の負荷インピーダンス
を低くすればよい。This can be prevented by lowering the load impedance on the secondary side of the transformer.
周知のように、この種データ伝送システムに用いられる
トランス１１は、単なるアイソレーション用の小型トラ
ンスであるから、高インピーダンスで負荷の影響を受は
易く負荷インピーダンスが小さくなると、２次側巻線の
発生電圧も低下するという機能がある。As is well known, the transformer 11 used in this type of data transmission system is simply a small transformer for isolation, so it has a high impedance and is easily affected by the load, and when the load impedance decreases, the secondary winding It also has the function of reducing the generated voltage.
したがって温度上昇により抵抗値の下がるサー□スタ１
６を抵抗１７とともに並列接続シ２、レシーバの入力端
に接続すれば、次の作用Ｃよって温度補償の効果を生じ
る。Therefore, the resistance value decreases as the temperature rises.
If the resistor 6 is connected in parallel with the resistor 17 to the input terminal of the receiver, a temperature compensation effect is produced by the following action C.
すなわち、伝送路の片側が外れた状態で温度上昇が生じ
ると、サーミスタ１６と抵抗１７で構成される合成抵抗
が小さくなり、これによってトランス１１の２次側発生
電圧が小さくなる。That is, if the temperature rises with one side of the transmission line disconnected, the combined resistance made up of the thermistor 16 and resistor 17 becomes smaller, thereby reducing the voltage generated on the secondary side of the transformer 11.
さらにまた伝送路の片側が外れているため、トランスの
１次側からみた受信機のインピーダンスが大きく、トラ
ンスの２次側の負荷インピーダンスが小さくなり、結果
として負荷が重くなるとトランスの２次側巻線の発生電
圧は、より小さくなりやすい。Furthermore, since one side of the transmission line is disconnected, the impedance of the receiver seen from the primary side of the transformer is large, and the load impedance on the secondary side of the transformer is small. As a result, when the load becomes heavy, the secondary winding of the transformer The voltage generated in the line tends to be smaller.
こ５して、ダイオード１４．１５のスレッショルドレベ
ルが低下しても、トランスの２次側発生電圧もまた小さ
ぐなっているので、トランスの２次側発生電圧とダイオ
ードのスレッショルド電圧の差電圧つ唸すレシーバ１３
の入力電圧は、レシーバ１３の受信検知レベルより常に
小さくなることが可能となる。5. Even if the threshold level of the diodes 14 and 15 decreases, the voltage generated on the secondary side of the transformer also decreases, so the voltage difference between the voltage generated on the secondary side of the transformer and the threshold voltage of the diode increases. Roaring receiver 13
The input voltage of the receiver 13 can always be lower than the reception detection level of the receiver 13.
すなわち温度補償がなし得る。In other words, temperature compensation can be achieved.
なオ・、すでに述べた説明からも分る。Oh, it's clear from the explanation I've already given.
１ｍつに、この種データ伝送システムに卦いては、伝送
路に多数の受信機を接続する必要から、個々の受信機の
入力インピーダンスはできるだけ大きい方が望ましい。First, in this type of data transmission system, it is necessary to connect a large number of receivers to the transmission path, so it is desirable that the input impedance of each receiver be as large as possible.
この意味で、サー□スタを含む温度補償回路を、逆並列
接続されスレッショルドレベル以下で大キなインピーダ
ンスを有するダイオードとレシーバの間に設けることは
、入力インピーダンスを大きくする効果がある。In this sense, providing a temperature compensation circuit including a servo resistor between the receiver and the diode which is connected in antiparallel and has a large impedance below the threshold level has the effect of increasing the input impedance.
第１図は伝送システムの一実施例回路図、第２図は従来
の受信機の回路図、第３図はこの発明の一実施例である
受信機の回路図である。
図にち・いて、１：伝送路ｉ１：）ランス、１３：レシ
ーバ、１４，１５：ダイオード、１６：サーミスタ。FIG. 1 is a circuit diagram of an embodiment of a transmission system, FIG. 2 is a circuit diagram of a conventional receiver, and FIG. 3 is a circuit diagram of a receiver according to an embodiment of the present invention. In the figure, 1: transmission line i1:) lance, 13: receiver, 14, 15: diode, 16: thermistor.
Claims (1)
タ信号を送受信するものにむいて、伝送路に接続される
トランスの２次側の一端と、このトランスから出る信号
を受信するレシーバとの間に介在される逆並列接続した
ダイオードと、このダイオードの出力端と前記トランス
の２次側の他端とに接続され、温度上昇により抵抗値の
下がるザー□スタを含む温度補償回路を備えたことを特
徴とする送受信システムの受信機。1. For those who install many transmitting and receiving stations in parallel on a transmission line and transmit and receive data signals between these stations, one end of the secondary side of a transformer connected to the transmission line and the signal output from this transformer are received. A temperature compensation circuit including a diode connected in antiparallel to the receiver, and a resistor connected to the output end of this diode and the other end of the secondary side of the transformer, whose resistance value decreases as the temperature rises. A receiver for a transmitting/receiving system comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54058549A JPS5827706B2 (en) | 1979-05-11 | 1979-05-11 | Receiver of transmitting and receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54058549A JPS5827706B2 (en) | 1979-05-11 | 1979-05-11 | Receiver of transmitting and receiving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55150638A JPS55150638A (en) | 1980-11-22 |
| JPS5827706B2 true JPS5827706B2 (en) | 1983-06-10 |
Family
ID=13087532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54058549A Expired JPS5827706B2 (en) | 1979-05-11 | 1979-05-11 | Receiver of transmitting and receiving system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827706B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6426063U (en) * | 1987-08-05 | 1989-02-14 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6010838A (en) * | 1983-06-29 | 1985-01-21 | Matsushita Electric Ind Co Ltd | Transmission and reception network system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5183729A (en) * | 1975-01-20 | 1976-07-22 | Matsushita Electric Ind Co Ltd | ZATSUONYOKUATSU KAIRO |
-
1979
- 1979-05-11 JP JP54058549A patent/JPS5827706B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5183729A (en) * | 1975-01-20 | 1976-07-22 | Matsushita Electric Ind Co Ltd | ZATSUONYOKUATSU KAIRO |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6426063U (en) * | 1987-08-05 | 1989-02-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55150638A (en) | 1980-11-22 |
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