JPH04315336A - Multiplex transmission system - Google Patents

Multiplex transmission system

Info

Publication number
JPH04315336A
JPH04315336A JP3080297A JP8029791A JPH04315336A JP H04315336 A JPH04315336 A JP H04315336A JP 3080297 A JP3080297 A JP 3080297A JP 8029791 A JP8029791 A JP 8029791A JP H04315336 A JPH04315336 A JP H04315336A
Authority
JP
Japan
Prior art keywords
terminal
value
impedance
signal
multiplex transmission
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.)
Granted
Application number
JP3080297A
Other languages
Japanese (ja)
Other versions
JP3024812B2 (en
Inventor
Katsuhiko Kimura
克彦 木村
Yoshiharu Suzuki
義春 鈴木
Kiyotaka Takehara
清隆 竹原
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP3080297A priority Critical patent/JP3024812B2/en
Publication of JPH04315336A publication Critical patent/JPH04315336A/en
Application granted granted Critical
Publication of JP3024812B2 publication Critical patent/JP3024812B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Abstract

PURPOSE:To improve the reliability in the long distance signal transmission by decreasing fluctuation of a signal reception level with respect to the signal transmission distance. CONSTITUTION:Each terminal equipment 3 is provided with an impedance element 5 whose resistance is made variable. A master set 1 sends a signal to the terminal equipments 3 and a CPU of the master set 1 confirms number N of the terminal equipments 3 in the system. Then a data relating to the number of the terminal equipments 3 is sent from the master set 1 to each terminal equipment 3. Then the CPU of each terminal equipment 3 outputs a control signal to adjust an impedance of the impedance element 5 to be a value (NXR) being the product between an output impedance R of the master set 1 and number of the terminal equipments 3.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、集合住宅管理システム
などの遠隔監視制御システムにおける多重伝送システム
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission system in a remote monitoring and control system such as a housing complex management system.

【0002】0002

【従来の技術】図4はこの種の多重伝送システムの概略
構成図を示し、親機1からの一対の伝送線2に複数の端
末器3が接続されている。また、親機1の出力側には一
定値の終端抵抗4が接続してある。図5は親機1のブロ
ック図を示し、伝送線2に電圧を印加すべく電源15が
チョークコイル14を介して設けてあり、また、CPU
11及び送受信回路12はパルストランス13を介して
伝送線2に接続されるようになっている。
2. Description of the Related Art FIG. 4 shows a schematic configuration diagram of this type of multiplex transmission system, in which a plurality of terminal devices 3 are connected to a pair of transmission lines 2 from a base device 1. Furthermore, a terminating resistor 4 having a constant value is connected to the output side of the base unit 1. FIG. 5 shows a block diagram of the base unit 1, in which a power supply 15 is provided via a choke coil 14 to apply voltage to the transmission line 2, and a CPU
11 and the transmitting/receiving circuit 12 are connected to the transmission line 2 via a pulse transformer 13.

【0003】図6は端末器3のブロック図を示し、CP
U31、送受信回路32、パルストランス33、チョー
クコイル34、スイッチングレギュレータ35等で構成
されている。親機1と各端末器3との間では、時分割多
重伝送によりデータの伝送の授受が行われるようになっ
ている。
FIG. 6 shows a block diagram of the terminal 3, in which the CP
It is composed of U31, a transmitting/receiving circuit 32, a pulse transformer 33, a choke coil 34, a switching regulator 35, and the like. Data is exchanged between the base device 1 and each terminal device 3 by time division multiplex transmission.

【0004】0004

【発明が解決しようとする課題】従来は図4に示すよう
に、親機1に一定値の終端抵抗4を設けていたが、信号
伝送距離が長距離になるほど、親機1における端末器3
からの信号受信レベルが低下してしまうため、信号送出
端末器3の位置により受信信号波形レベルが大きく変動
してしまうという問題があった。
[Problems to be Solved by the Invention] Conventionally, as shown in FIG.
Since the signal reception level from the terminal device 3 decreases, there is a problem in that the reception signal waveform level varies greatly depending on the position of the signal transmission terminal device 3.

【0005】本発明は上述の点に鑑みて提供したもので
あって、信号伝送距離に対する信号受信レベルの変動を
減少させ、長距離信号伝送における信頼性を向上させる
ことを目的とした多重伝送システムを提供するものであ
る。
The present invention has been provided in view of the above-mentioned points, and is a multiplex transmission system that aims to reduce fluctuations in signal reception level with respect to signal transmission distance and improve reliability in long-distance signal transmission. It provides:

【0006】[0006]

【課題を解決するための手段】本発明は、各端末器の入
力側に値を可変可能としたインピーダンス素子を接続し
、端末器数に関するデータを親機から各端末器に伝送し
、端末器ではインピーダンス素子の値を、親機の出力イ
ンピーダンスに端末器の数を乗じた値となるように自動
調整するようにしたものである。
[Means for Solving the Problems] The present invention connects an impedance element whose value can be changed to the input side of each terminal, transmits data regarding the number of terminals from the base unit to each terminal, and In this case, the value of the impedance element is automatically adjusted to the value obtained by multiplying the output impedance of the parent device by the number of terminal devices.

【0007】[0007]

【作  用】而して、システムに接続されている端末器
の数に関するデータを親機から各端末器に向けて伝送し
、その情報により、各端末器はインピーダンス素子の値
を、親機の出力インピーダンスに端末器の数を乗じた値
となるように自動調整することにより、端末器の数に関
わらず伝送線の線路間のインピーダンスを常に一定とし
、各端末器において所望の信号受信レベルが得られるよ
うにしている。
[Operation] Data regarding the number of terminals connected to the system is transmitted from the base unit to each terminal, and based on that information, each terminal changes the value of the impedance element of the base unit. By automatically adjusting the output impedance to the value multiplied by the number of terminals, the impedance between the lines of the transmission line is always constant regardless of the number of terminals, and the desired signal reception level is achieved at each terminal. I'm trying to get it.

【0008】[0008]

【実施例】以下、本発明の実施例を図面を参照して説明
する。図1は全体の概略構成図を示し、図2は端末器3
の要部のブロック図を示し、また、図3は動作説明用の
フローチャートを示している。全体の構成は従来とほぼ
同様であるが、各端末器3に抵抗値を可変としたインピ
ーダンス素子5を設けている。このインピーダンス素子
5の値を変化させて、端末器3側で所望の信号受信レベ
ルが得られるようにしているものである。
Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic diagram of the overall configuration, and FIG. 2 shows a terminal device 3.
FIG. 3 shows a block diagram of the main parts of the system, and FIG. 3 shows a flowchart for explaining the operation. The overall configuration is almost the same as the conventional one, but each terminal 3 is provided with an impedance element 5 whose resistance value is variable. By changing the value of this impedance element 5, a desired signal reception level can be obtained on the terminal device 3 side.

【0009】次に図3に基づいて動作を説明する。まず
、親機1に設置されている終端抵抗の値を親機1の出力
インピーダンスR程度に設定し、端末器3のインピーダ
ンス素子5は端末器3の入力インピーダンス程度の大き
い値とした状態とする。この状態で、親機1から端末器
3に向けて信号を送出し、その返送信号により親機1の
CPU11はシステム上の端末器3の数Nを確認する。 そして、端末器3の数に関するデータを親機1から各端
末器3に向けて伝送し、その後、各端末器3のCPU3
1から制御信号を出力して、インピーダンス素子5の値
を、親機1の出力インピーダンスに端末器3の数を乗じ
た値(N×R)となるように自動調整することで、端末
器3の数に関わらず線路間のインピーダンスを常に一定
にすることができる。従って、各端末器3において所望
の信号受信レベルを得ることができるものである。
Next, the operation will be explained based on FIG. First, the value of the terminating resistor installed in the base unit 1 is set to approximately the output impedance R of the base unit 1, and the impedance element 5 of the terminal unit 3 is set to a value approximately equal to the input impedance of the terminal unit 3. . In this state, a signal is sent from base unit 1 to terminal unit 3, and based on the return signal, CPU 11 of base unit 1 confirms the number N of terminal units 3 on the system. Then, data regarding the number of terminal devices 3 is transmitted from the base device 1 to each terminal device 3, and then the CPU 3 of each terminal device 3
By outputting a control signal from 1 and automatically adjusting the value of impedance element 5 to the value (N x R) obtained by multiplying the output impedance of base unit 1 by the number of terminal units 3, terminal unit 3 The impedance between lines can always be kept constant regardless of the number of lines. Therefore, each terminal 3 can obtain a desired signal reception level.

【0010】0010

【発明の効果】本発明は上述のように、各端末器の入力
側に値を可変可能としたインピーダンス素子を接続し、
端末器数に関するデータを親機から各端末器に伝送し、
端末器ではインピーダンス素子の値を、親機の出力イン
ピーダンスに端末器の数を乗じた値となるように自動調
整するようにしたものであるから、システムに接続され
ている端末器の数に関するデータを親機から各端末器に
向けて伝送し、その情報により、各端末器はインピーダ
ンス素子の値を、親機の出力インピーダンスに端末器の
数を乗じた値となるように自動調整することにより、端
末器の数に関わらず伝送線の線路間のインピーダンスを
常に一定とし、各端末器において所望の信号受信レベル
が得られることができるものであり、そのため、長距離
信号伝送システムにおいて、各端末器における信号受信
レベルが従来に比べて安定化し、信号伝送の信頼性を向
上させることができ、また、伝送線にインピーダンス素
子を可変可能として各端末器に分散して設けているため
、端末器の数に関わらず、信号受信レベルの安定化を実
現できる効果を奏するものである。
[Effects of the Invention] As described above, the present invention connects an impedance element whose value can be changed to the input side of each terminal,
Transmits data regarding the number of terminals from the base unit to each terminal,
Since the value of the impedance element in the terminal device is automatically adjusted to the value obtained by multiplying the output impedance of the parent device by the number of terminal devices, data regarding the number of terminal devices connected to the system is is transmitted from the base unit to each terminal, and based on that information, each terminal automatically adjusts the value of its impedance element to the value obtained by multiplying the output impedance of the base unit by the number of terminals. , the impedance between the lines of the transmission line is always constant regardless of the number of terminals, and the desired signal reception level can be obtained at each terminal. Therefore, in a long-distance signal transmission system, each terminal The signal reception level at the terminal is more stable than before, improving the reliability of signal transmission.In addition, variable impedance elements are provided on the transmission line and distributed to each terminal, making it possible to improve the reliability of signal transmission. Regardless of the number of signals, it is possible to achieve the effect of stabilizing the signal reception level.

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

【図1】本発明の実施例の多重伝送システムの概略構成
図である。
FIG. 1 is a schematic configuration diagram of a multiplex transmission system according to an embodiment of the present invention.

【図2】端末器のブロック図である。FIG. 2 is a block diagram of a terminal device.

【図3】動作説明用のフローチャートである。FIG. 3 is a flowchart for explaining operation.

【図4】従来の多重伝送システムの概略構成図である。FIG. 4 is a schematic configuration diagram of a conventional multiplex transmission system.

【図5】従来の親機のブロック図である。FIG. 5 is a block diagram of a conventional master device.

【図6】従来の端末器のブロック図である。FIG. 6 is a block diagram of a conventional terminal device.

【符号の説明】[Explanation of symbols]

1  親機 2  伝送線 3  端末器 5  インピーダンス素子 1 Base unit 2 Transmission line 3 Terminal 5 Impedance element

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  親機に一対の伝送線を介して複数の端
末器が接続され、親機と各端末器との間で多重伝送にて
データの授受を行う多重伝送システムにおいて、各端末
器の入力側に値を可変可能としたインピーダンス素子を
接続し、端末器数に関するデータを親機から各端末器に
伝送し、端末器ではインピーダンス素子の値を、親機の
出力インピーダンスに端末器の数を乗じた値となるよう
に自動調整するようにしたことを特徴とする多重伝送シ
ステム。
Claim 1: In a multiplex transmission system in which a plurality of terminal devices are connected to a base device via a pair of transmission lines, and data is exchanged by multiplex transmission between the base device and each terminal device, each terminal device An impedance element whose value can be changed is connected to the input side of the terminal, and data regarding the number of terminals is transmitted from the base unit to each terminal unit. 1. A multiplex transmission system characterized by automatically adjusting the value to be a value multiplied by a number.
JP3080297A 1991-04-15 1991-04-15 Multiplex transmission system Expired - Lifetime JP3024812B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3080297A JP3024812B2 (en) 1991-04-15 1991-04-15 Multiplex transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3080297A JP3024812B2 (en) 1991-04-15 1991-04-15 Multiplex transmission system

Publications (2)

Publication Number Publication Date
JPH04315336A true JPH04315336A (en) 1992-11-06
JP3024812B2 JP3024812B2 (en) 2000-03-27

Family

ID=13714341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3080297A Expired - Lifetime JP3024812B2 (en) 1991-04-15 1991-04-15 Multiplex transmission system

Country Status (1)

Country Link
JP (1) JP3024812B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6416741B1 (en) 1992-10-10 2002-07-09 Quadrant Healthcare (Uk) Limited Preparation of further diagnostic agents
US7029104B2 (en) 2001-11-08 2006-04-18 Seiko Epson Corporation Ink cartridge and recording apparatus
JP2009222339A (en) * 2008-03-18 2009-10-01 Daikin Ind Ltd Transmission device for air conditioner
WO2016157472A1 (en) * 2015-04-01 2016-10-06 三菱電機株式会社 Communication system and communication apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6416741B1 (en) 1992-10-10 2002-07-09 Quadrant Healthcare (Uk) Limited Preparation of further diagnostic agents
US7029104B2 (en) 2001-11-08 2006-04-18 Seiko Epson Corporation Ink cartridge and recording apparatus
US7249821B2 (en) 2001-11-08 2007-07-31 Seiko Epson Corporation Ink cartridge and recording apparatus
JP2009222339A (en) * 2008-03-18 2009-10-01 Daikin Ind Ltd Transmission device for air conditioner
WO2016157472A1 (en) * 2015-04-01 2016-10-06 三菱電機株式会社 Communication system and communication apparatus
JPWO2016157472A1 (en) * 2015-04-01 2017-09-07 三菱電機株式会社 Communication system and communication apparatus
US10378785B2 (en) * 2015-04-01 2019-08-13 Mitsubishi Electric Corporation Communication system and communication apparatus

Also Published As

Publication number Publication date
JP3024812B2 (en) 2000-03-27

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Effective date: 19991221