JP2754788B2 - Wireless telemeter one-way transmission system - Google Patents
Wireless telemeter one-way transmission systemInfo
- Publication number
- JP2754788B2 JP2754788B2 JP1256373A JP25637389A JP2754788B2 JP 2754788 B2 JP2754788 B2 JP 2754788B2 JP 1256373 A JP1256373 A JP 1256373A JP 25637389 A JP25637389 A JP 25637389A JP 2754788 B2 JP2754788 B2 JP 2754788B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- radio frequency
- frequency channel
- wireless
- measuring devices
- 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 - Fee Related
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Selective Calling Equipment (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は無線テレメータ特に単一の無線周波数チャネ
ルにより複数の計測装置によって計測した結果をデータ
収集装置に一方向に伝送する単向式無線テレメータの伝
送方式に関するものである。Description: FIELD OF THE INVENTION The present invention relates to wireless telemeters, and in particular to unidirectional wireless telemeters for unidirectionally transmitting the results measured by a plurality of measuring devices to a data collection device over a single radio frequency channel. This is related to the transmission method.
［従来の技術］ 複数の遠隔地点の計測結果を無線伝送によって一ケ所
のデータ収集装置に集める無線テレメータを実現するた
めには、各地点から送られてくる無線信号の衝突による
混信を回避する必要がある。遠隔の計測地点から一方向
にデータの送信のみを行なう単向式の無線伝送方式にお
いては、通常各々別の無線周波数チャネルを使用し、混
信によるデータの欠落を防止しているのが現状である
が、受信側においては使用する無線周波数チャネルの数
だけ無線受信機を複数台設置する必要がある。[Prior Art] In order to realize a wireless telemeter that collects measurement results of a plurality of remote points into one data collection device by wireless transmission, it is necessary to avoid interference due to collision of wireless signals transmitted from each point. There is. At present, unidirectional wireless transmission systems that only transmit data in one direction from a remote measurement point usually use different radio frequency channels to prevent data loss due to interference. However, on the receiving side, it is necessary to install a plurality of radio receivers by the number of radio frequency channels to be used.
単一の無線周波数チャネルにより複数の計測地点から
一ケ所のデータ収集装置にデータを無線伝送するために
は、各計測装置及びデータ収集装置の両者に同一周波数
チャネルに設定した無線送信機と受信機を設置してお
き、各計測装置はデータ収集装置から送信される自局宛
のデータ要求信号を受信した時のみ自局データを送信す
る単信式ポーリング方式を採用する必要がある。In order to wirelessly transmit data from a plurality of measurement points to a single data collection device using a single radio frequency channel, a radio transmitter and a receiver set to the same frequency channel for both the measurement device and the data collection device It is necessary to adopt a simplex polling method in which each measuring apparatus transmits its own station data only when receiving a data request signal addressed to the own station transmitted from the data collecting apparatus.
［発明が解決しようとする課題］ 前記した通り、単向式の従来技術においては計測装置
の数だけ無線周波数チャネルを使用する必要があり、電
波資源の公共性から考えて極めて非効率であるばかりで
なく、受信側にあたるデータ収集装置においては使用す
る無線周波数チャネルの数だけ各々の周波数に同調して
受信する無線受信機を設置する必要があり極めて不経済
である。[Problems to be Solved by the Invention] As described above, in the one-way conventional technology, it is necessary to use radio frequency channels as many as the number of measuring devices, which is extremely inefficient in view of the public nature of radio wave resources. In addition, in the data collection device on the receiving side, it is necessary to install radio receivers that tune to each frequency by the number of radio frequency channels to be used, which is extremely uneconomical.
また、単信式の従来技術においては、無線周波数１チ
ャンネルを使用するのみで電波の衝突回避を実現できる
が、各計測装置及びデータ収集装置の両者に無線送信機
と受信機を設置する必要があり、これも極めて不経済な
方法である。Further, in the simplex type conventional technology, collision avoidance of radio waves can be realized by using only one radio frequency channel. However, it is necessary to install a radio transmitter and a receiver in each of the measuring devices and the data collecting devices. Yes, this is also a very expensive method.
本発明の目的は、前記した従来技術の欠点を解消し、
単一の無線周波数チャネルのみを使用し、複数の計測装
置からのデータを混信なくデータ収集装置に無線伝送す
るための単向式無線伝送方式を提供することにある。An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
An object of the present invention is to provide a one-way wireless transmission system for wirelessly transmitting data from a plurality of measurement devices to a data collection device without interference using only a single radio frequency channel.
［課題を解決するための手段］ 本発明の要旨は、遠隔地点にある複数の計測装置によ
る計測結果を単一無線周波数チャネルによってデータ収
集装置に送信する単向式無線テレメータにおいて、複数
の該計測装置は単一の該無線周波数チャネルの電波の有
無を検出するキャリアセンス機能を有する無線送信機を
具備しており、各計測装置は前回の送信から所定の送信
周期を経過した後であってかつ該キャリアセンス機能に
よって各々別々に設定した送信遅延時間の間該無線周波
数チャネルの電波がないことを確認した時にのみ該計測
データを送信し、前記送信周期ti、送信遅延時間t
d（ｊ）及び計測データの送信時間ttは、 但し、Ｎは計測装置の数の式を満たすように設定したこ
とにある。Means for Solving the Problems The gist of the present invention is to provide a one-way wireless telemeter that transmits measurement results obtained by a plurality of measuring devices at remote locations to a data collection device through a single radio frequency channel. The device includes a wireless transmitter having a carrier sense function for detecting the presence or absence of radio waves of the single radio frequency channel, each measuring device after a predetermined transmission period has elapsed since the previous transmission, and The measurement data is transmitted only when it is confirmed that there is no radio wave of the radio frequency channel during the transmission delay time set individually by the carrier sense function, and the transmission cycle t i , the transmission delay time t
d (j) and the transmission time t t of the measurement data are However, N is set so as to satisfy the equation of the number of measuring devices.
［実施例］ 本発明無線テレメータ単向式伝送方式を実施例示す図
によって具体的に説明する。[Embodiment] The wireless telemeter one-way transmission system of the present invention will be specifically described with reference to the drawings showing an embodiment.
第１図は本発明無線テレメータ単向式伝送方式の一実
施例を示す全体構成図である。センサ１により計測した
結果は計測装置２により無線アンテナ３から無線周波数
f1により無線伝送される。データ収集装置４は無線アン
テナ３から無線伝送された信号を受信する。FIG. 1 is an overall configuration diagram showing one embodiment of a wireless telemeter one-way transmission system of the present invention. The result measured by the sensor 1 is transmitted from the radio antenna 3 by the measuring device 2 to the radio frequency.
The f 1 are wirelessly transmitted. The data collection device 4 receives a signal wirelessly transmitted from the wireless antenna 3.
第２図は本発明無線テレメータ単向式伝送方式を採用
した計測装置２の一実施例を示す回路構成図である。セ
ンサ１により計測した結果はセンサアンプ21により増幅
され、A/D変換器22によりデジタル信号に変換され、更
にP/S変換器23により直列ディジタル信号に変換された
後無線送信機24によって無線信号としてアンテナ切換器
25及びアンテナ３を通って送信される。FIG. 2 is a circuit diagram showing one embodiment of the measuring device 2 employing the one-way wireless telemeter transmission system of the present invention. The result measured by the sensor 1 is amplified by the sensor amplifier 21, converted into a digital signal by the A / D converter 22, further converted into a serial digital signal by the P / S converter 23, and then transmitted by the wireless transmitter 24. As an antenna switch
25 and transmitted through antenna 3.
P/S変換器23及び無線送信機24はキャリアセンス27に
よって動作する送信制御装置26によって制御される。The P / S converter 23 and the wireless transmitter 24 are controlled by a transmission control device 26 operated by a carrier sense 27.
第３図は第２図に示した送信制御装置26の一実施例を
示す回路構成図である。キャリアセンス27はアンテナ３
によって入力される当該周波数f1の電波の有無を検出
し、電波を検出した時に出力する信号によって送信遅延
時間タイマ261をリセットする。FIG. 3 is a circuit diagram showing one embodiment of the transmission control device 26 shown in FIG. Carrier sense 27 is antenna 3
Detecting the presence or absence of the radio wave of the frequency f 1 which is input by resetting the transmission delay time timer 261 by a signal output upon detection of a radio wave.
この送信遅延時間タイマ261には計測装置２の＃１〜
＃４各々にtd（１）〜td（４）の時間が設定されてお
り、キャリアセンス出力がなくなってから時間td経過後
に出力する。一方、送信間隔タイマ262は前回の送信時
から時間ti経過後に出力し、これと前述の送信遅延時間
タイマ261の出力との論理積（AND）を論理積回路263に
よって得る。論理積回路263の出力は送信継続タイマ264
を起動し、時間ttの間送信制御信号を出力し、これによ
って第２図に示したP/S変換器23及び無線送信機24、ア
ンテナ切換器25動作し、データを送信する。The transmission delay time timer 261 includes # 1 to # 1 of the measuring device 2.
The time of td (1) to td (4) is set for each of # 4, and is output after the time td has elapsed since the carrier sense output disappeared. On the other hand, the transmission interval timer 262 outputs the data after the elapse of the time ti from the previous transmission, and obtains a logical product (AND) of the output from the transmission delay time timer 261 by the logical product circuit 263. The output of the AND circuit 263 is the transmission continuation timer 264
Start and outputs between the transmission control signal in the time t t, thereby the P / S converter 23 and the radio transmitter 24 shown in FIG. 2, the antenna switching equipment 25 operates to transmit the data.
第４図は以上説明した本発明無線テレメータ単向式伝
送方式の一実施例のキャリアセンス及び送信動作を示す
タイムチャートである。同図に示す様に送信遅延時間td
を各計測装置＃１〜＃４毎に td（１）＜td（２）＜td（３）＜td（４） と設定しているために、各計測装置は同時送信して混信
を引き起こすことなく整然と（＃１）→（＃２）→（＃
３）→（＃４）の順に送信される。この状態は、各計測
装置が別々に運用を開始しても全く問題なく達成される
極めて信頼性の高い方式である。実施例においては、計
測装置の数を４台としているが、更に多数の計測装置を
採用することも勿論である。電波の混信を発生すること
なく、全ての信号が整然と送信されるためには、 を満たす様に各時間を設定する必要がある。FIG. 4 is a time chart showing the carrier sensing and transmission operation of one embodiment of the one-way wireless telemeter transmission system of the present invention described above. As shown in the figure, the transmission delay time td
Is set as td (1) <td (2) <td (3) <td (4) for each of the measuring devices # 1 to # 4, so that the measuring devices simultaneously transmit and cause interference. (# 1) → (# 2) → (#
3) transmitted in the order of (# 4). This state is an extremely reliable method that can be achieved without any problem even if each measuring device starts operation separately. In the embodiment, the number of the measuring devices is four, but it goes without saying that a larger number of measuring devices may be employed. In order for all signals to be transmitted orderly without causing radio interference, It is necessary to set each time so that it satisfies.
本発明無線テレメータ単向式伝送方式に使用するキャ
リアセンスは、従来技術に示した単信方式等に使用され
る無線受信機と異なり、単に当該無線周波数f1の電波の
有無を検出する機能のみでよいため、復調回路等を必要
とせず極めて簡単な構成で達成可能である。Carrier sense used in the present invention a radio telemeter unidirectional type transmission system, unlike the radio receiver used in the simplex such as a conventional, merely the ability to detect the presence or absence of the radio wave of the radio frequency f 1 Therefore, it can be achieved with a very simple configuration without the need for a demodulation circuit or the like.
［発明の効果］ 以上説明した通り、本発明無線テレメータ単向式伝送
方式によれば、単一の無線周波数チャネルのみを使用
し、複数の計測装置からデータを混信なしに確実にデー
タ収集装置に伝送できる極めて信頼性の高い、効率的な
伝送が可能となる顕著な効果を有するものである。[Effects of the Invention] As described above, according to the one-way wireless telemeter transmission system of the present invention, only a single radio frequency channel is used, and data from a plurality of measurement devices is reliably transmitted to a data collection device without interference. It has a remarkable effect of enabling highly reliable and efficient transmission.
第１図は本発明無線テレメータ単向式伝送方式の一実施
例を示す全体構成図、第２図は計測装置の一実施例を示
す回路構成図、第３図は第２図に示した送信制御装置の
一実施例を示す回路構成図である。また、第４図は第１
図〜第３図に示した本発明無線テレメータ単向式伝送方
式の一実施例のキャリアセンス及び送信動作を説明する
タイムチャートである。 1:センサ、 2:計測装置、 3:無線アンテナ、 4:データ収集装置、 21:センサ・アンプ、 22:A/D変換器、 23:P/S変換器、 24:無線送信機、 25:アンテナ切換器、 26:送信制御装置、 27:キャリアセンス、 261:送信遅延時間タイマ、 262:送信間隔タイマ、 263:論理積（AND）回路、 264:送信継続時間タイマ。FIG. 1 is an overall configuration diagram showing one embodiment of a one-way wireless telemeter transmission system of the present invention, FIG. 2 is a circuit configuration diagram showing one embodiment of a measuring device, and FIG. 3 is a transmission diagram shown in FIG. FIG. 2 is a circuit configuration diagram illustrating an example of a control device. Also, FIG.
4 is a time chart for explaining the carrier sensing and transmission operation of the embodiment of the wireless telemeter one-way transmission system of the present invention shown in FIGS. 1: Sensor, 2: Measurement device, 3: Wireless antenna, 4: Data collection device, 21: Sensor amplifier, 22: A / D converter, 23: P / S converter, 24: Wireless transmitter, 25: Antenna switch, 26: Transmission control device, 27: Carrier sense, 261: Transmission delay time timer, 262: Transmission interval timer, 263: Logical product (AND) circuit, 264: Transmission duration timer.
Claims (1)
結果を単一無線周波数チャネルによってデータ収集装置
に送信する単向式無線テレメータにおいて、複数の該計
測装置は単一の該無線周波数チャネルの電波の有無を検
出するキャリアセンス機能を有する無線送信機を具備し
ており、各計測装置は前回の送信から所定の送信周期を
経過した後であってかつ該キャリアセンス機能によって
各々別々に設定した送信遅延時間の間該無線周波数チャ
ネルの電波がないことを確認した時にのみ該計測データ
を送信し、前記送信周期ti、送信遅延時間td（ｊ）及び
計測データの送信時間ttは、 但し、Ｎは計測装置の数の式を満たすように設定させて
いることを特徴とした無線テレメータ単向式伝送方法。1. A one-way wireless telemeter for transmitting measurement results from a plurality of measuring devices at remote locations to a data collection device through a single radio frequency channel, wherein the plurality of measuring devices are connected to a single radio frequency channel. A wireless transmitter having a carrier sense function for detecting the presence or absence of radio waves is provided, and each measuring device is set separately after a predetermined transmission cycle has elapsed since the previous transmission and by the carrier sense function. The measurement data is transmitted only when it is confirmed that there is no radio wave of the radio frequency channel during the transmission delay time, and the transmission cycle t i , the transmission delay time t d (j), and the transmission time t t of the measurement data are: However, N is set so as to satisfy the equation of the number of measuring devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1256373A JP2754788B2 (en) | 1989-09-29 | 1989-09-29 | Wireless telemeter one-way transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1256373A JP2754788B2 (en) | 1989-09-29 | 1989-09-29 | Wireless telemeter one-way transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03117931A JPH03117931A (en) | 1991-05-20 |
| JP2754788B2 true JP2754788B2 (en) | 1998-05-20 |
Family
ID=17291789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1256373A Expired - Fee Related JP2754788B2 (en) | 1989-09-29 | 1989-09-29 | Wireless telemeter one-way transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2754788B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2764717B2 (en) * | 1992-09-28 | 1998-06-11 | 株式会社堀場製作所 | Measurement system |
| JP3947026B2 (en) * | 2002-03-29 | 2007-07-18 | オムロン株式会社 | Information processing apparatus and method, and recording medium |
| JP2008258715A (en) * | 2007-04-02 | 2008-10-23 | Ricoh Elemex Corp | Centralized meter-reading device, and microcomputer meter with communication function |
| FR2961054A1 (en) * | 2010-06-08 | 2011-12-09 | Sigfox Wireless | METHOD FOR USING SHARED FREQUENCY RESOURCE, METHOD FOR CONFIGURING TERMINALS, TERMINALS, AND TELECOMMUNICATIONS SYSTEM |
| JP2014175678A (en) * | 2013-03-05 | 2014-09-22 | Fuji Tecom Inc | Method for preventing interference in water pipeline monitoring device |
| JP6216402B2 (en) * | 2016-03-18 | 2017-10-18 | ニシム電子工業株式会社 | Terminal for data acquisition and transmission |
| JP6564430B2 (en) * | 2017-08-25 | 2019-08-21 | ニシム電子工業株式会社 | Terminal for data acquisition and transmission |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61278235A (en) * | 1985-06-03 | 1986-12-09 | Fujitsu Ten Ltd | Data collection system of optical transmission system |
-
1989
- 1989-09-29 JP JP1256373A patent/JP2754788B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61278235A (en) * | 1985-06-03 | 1986-12-09 | Fujitsu Ten Ltd | Data collection system of optical transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03117931A (en) | 1991-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |