JPH07120973B2 - Measurement data wireless transfer device - Google Patents
Measurement data wireless transfer deviceInfo
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- JPH07120973B2 JPH07120973B2 JP2179241A JP17924190A JPH07120973B2 JP H07120973 B2 JPH07120973 B2 JP H07120973B2 JP 2179241 A JP2179241 A JP 2179241A JP 17924190 A JP17924190 A JP 17924190A JP H07120973 B2 JPH07120973 B2 JP H07120973B2
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- data
- measuring instruments
- transmission
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、計測器で得られた計測データを無線転送によ
り親機に送信する計測データ無線転送装置に関する。Description: TECHNICAL FIELD The present invention relates to a measurement data wireless transfer device for transmitting measurement data obtained by a measuring instrument to a master unit by wireless transfer.
本発明は、複数の計測器から得られる計測データを微弱
電波を用いた無線転送により個別に順次収集する親機と
前記計測器に関する。親機は計測器へ計測データの送信
要求信号を計測器の間欠受信周期以上連続して送出す
る。送信要求信号には、基準となる送信開始時刻迄の時
間データが含まれており、経時とともに時間データは変
化する。計測器は受信した送信要求信号に含まれる時間
データから送信開始時刻を認識し、送信開始時刻後それ
ぞれの計測器に与えられた一定期間に計測データを送信
する。上述のような通信手順により、簡易的な通信シス
テムで計測器からの送信データが衝突することなく、か
つ時間効率良くデータ収集が可能になる。The present invention relates to a master device and the measuring device that individually and sequentially collect measurement data obtained from a plurality of measuring devices by wireless transfer using weak radio waves. The master unit continuously sends a measurement data transmission request signal to the measuring instrument for at least the intermittent reception cycle of the measuring instrument. The transmission request signal includes time data up to the reference transmission start time, and the time data changes with time. The measuring instrument recognizes the transmission start time from the time data included in the received transmission request signal, and transmits the measurement data in a fixed period given to each measuring instrument after the transmission start time. By the communication procedure as described above, it is possible to collect data in a simple communication system in a time-efficient manner without collision of the transmission data from the measuring instruments.
従来、複数の計測器から得られる計測データを微弱電波
を用いた無線転送により親機が個別に収集する通信装置
には以下のような方式があった。Conventionally, a communication device in which a master device individually collects measurement data obtained from a plurality of measuring devices by wireless transfer using weak radio waves has the following method.
第１の例として、計測器はデータ送信準備が完了したら
送信を開始し、親機は計測器からの送信信号を正常に受
信した場合には、鳴音あるいはランプの点灯等の手段に
より受信完了を報知する装置。As a first example, the measurement device starts transmission when data transmission preparation is completed, and when the master device normally receives the transmission signal from the measurement device, reception is completed by means such as sounding or lighting of a lamp. A device that informs.
第２の例として、計測器は送信を行う前にキャリアセン
スを実施し、自身の送信周波数と同一のキャリアの存在
を認識し混信を妨ぐ方式。この方式には他の計測器が送
信しているキャリア自身をセンスする場合と、親機が他
の計測器からの送信を認識した場合に送信する前記計測
器からの送信周波数とは異なるキャリアを、センスする
場合がある。As a second example, the measuring instrument performs carrier sensing before transmitting, and recognizes the presence of the same carrier as its own transmission frequency to prevent interference. In this method, when the carrier itself that another measuring instrument is transmitting is sensed, and when the master unit recognizes the transmission from another measuring instrument, a carrier different from the transmission frequency from the measuring instrument is transmitted. , You may have a sense.
第３の例として、親機は任意の計測器からデータを収集
する場合には、計測器個別に与えられたIDを含む送信要
求信号を送信し、計測器は前記送信要求信号に自身のID
を認識した場合に親機に対してデータ送信する方式。As a third example, when collecting data from an arbitrary measuring device, the master device transmits a transmission request signal including an ID given to each measuring device, and the measuring device sends its own ID to the transmission request signal.
A method of transmitting data to the base unit when it recognizes.
以上の様な方式がある。There is a method as described above.
上記方式により、多数の計測器が高頻度で計測データを
送信する場合、次の様な欠点を有している。When a large number of measuring instruments transmit measurement data with high frequency by the above method, there are the following drawbacks.
第１の方式では、同時に電波が発射される可能性大で、
信号の衝突による混信が予想される。また混信を認識す
る手段を有しているが人間による判断が必要となり自動
化が困難である。In the first method, radio waves are likely to be emitted at the same time,
Interference due to signal collision is expected. Although it has a means for recognizing interference, it is difficult to automate because it requires human judgment.
第２の方式では、送信の頻度が低い場合には問題ない
が、一定の短期間に管理している全ての計測器からの計
測データ収集を行うような使用方法においては混信の可
能性が増大し、かつ時間効率も良くない。In the second method, there is no problem if the frequency of transmission is low, but the possibility of interference increases when used in such a way that measurement data is collected from all the measuring instruments that are managed in a certain short period of time. It is also not time efficient.
第３の方式では、混信が発生する可能性は無くACK信号
の返答も可能であるが、携帯型計測器のようにバッテリ
ー動作する機種においてはバッテリーセービングのため
に間欠受信動作が行われており、親機側から送られてく
る送信要求信号を時間効率良く受信するための間欠受信
周期短縮化と低消費電力化は相反する。In the third method, there is no possibility of interference, and it is possible to reply with an ACK signal. However, in models that operate on batteries, such as portable measuring instruments, intermittent reception operation is performed for battery saving. The shortening of the intermittent reception cycle and the reduction of power consumption for time-efficiently receiving the transmission request signal sent from the master unit conflict with each other.
上記課題を解決するために、本発明において親機は、基
準となる送信開始時刻迄の時間データを含む計測データ
の送信要求信号を計測器の間欠受信周期以上繰り返して
送信し、計測器は受信した送信要求信号に含まれる時間
データから送信開始時刻迄の時間を認識し、送信開始時
刻後それぞれの計測器に与えられた一定期間に計測デー
タを送信する装置を構成した。In order to solve the above-mentioned problems, in the present invention, the master device repeatedly transmits a transmission request signal of measurement data including time data up to a reference transmission start time for at least the intermittent reception cycle of the measurement device, and the measurement device receives. The device configured to recognize the time from the time data included in the transmission request signal to the transmission start time and to transmit the measurement data within a fixed period given to each measuring device after the transmission start time.
上記の様な構成にすれば、同一の周期ではあるが非同期
に間欠受信している計測器に対して送信開始時刻という
概念で同期をとることが可能となる。With the above-described configuration, it is possible to synchronize with a measuring instrument that is intermittently receiving asynchronously in the same cycle, based on the concept of transmission start time.
以下に本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第４図は本発明の実施例のシステム図である。FIG. 4 is a system diagram of an embodiment of the present invention.
複数の計測器1,2……ｍと親機36とから構成される。It is composed of a plurality of measuring instruments 1, 2 ... m and a master unit 36.
第３図は、本発明の実施例の親機送信要求信号データ構
成図である。親機36は、親機送信要求信号を計測器１、
２……ｍに送って計測データを各計測器から収集する。
送信データ（親機送信要求信号）の１ブロックは34で表
され、34,35のように繰り返し送信される。前記送信デ
ータの１ブロック34は、同期データＡ（第１の同期デー
タ）31、時間データ32、同期データＢ（第２の同期デー
タ）33から構成され、前記同期データＡはブロックの先
頭、時間データ32は、計測器の送信タイミングの基準と
なる送信開始時刻までの時間、同期データB33は前記時
間データ32をタイマ手段で計測する際に計測開始時間の
タイミングをとる信号である。前記時間データ32のデー
タは、送信開始時刻までの時間を表すが、１ビットの重
みづけを１（ms）とし、BCDで30ならば30（ms）、また
は送信要求信号34の１ブロック長が40（ms）の場合、重
みづけを40（ms）とし、BCDで30ならば1200（ms）とし
ても良い。FIG. 3 is a data configuration diagram of a master unit transmission request signal according to the embodiment of the present invention. The master unit 36 transmits the master unit transmission request signal to the measuring instrument 1,
2 ... Send to m and collect measurement data from each measuring instrument.
One block of transmission data (master unit transmission request signal) is represented by 34, and is repeatedly transmitted as 34 and 35. One block 34 of the transmission data is composed of synchronous data A (first synchronous data) 31, time data 32, and synchronous data B (second synchronous data) 33. The synchronous data A is the beginning of the block, the time. The data 32 is a time until the transmission start time which is the reference of the transmission timing of the measuring instrument, and the synchronous data B33 is a signal for timing the measurement start time when the time data 32 is measured by the timer means. The data of the time data 32 represents the time until the transmission start time, but the weighting of 1 bit is 1 (ms), and if the BCD is 30, 30 (ms), or 1 block length of the transmission request signal 34 is In the case of 40 (ms), the weighting may be 40 (ms), and if the BCD is 30, 1200 (ms) may be used.
前記同期データB33は、前記時間データ32をタイマ手段
で計測する際に計測開始時間のタイミングをとる信号で
あり、例えば同期データB33の値を３ビット110とし、２
ビット目の立ち下がりを同期の基準として時間データ32
をタイマ手段により計測する様な構成とする。すなわ
ち、前述の立ち下がりで後述する時間データがセットさ
れたタイマ手段A14をトリガーさせる。The synchronization data B33 is a signal for timing the measurement start time when the time data 32 is measured by the timer means. For example, the value of the synchronization data B33 is 3 bits 110, and 2
Time data 32 with the falling edge of the bit as the synchronization reference
Is configured to be measured by the timer means. That is, the timer means A14 in which the time data described later is set is triggered at the aforementioned fall.
第１図（ａ）は本発明の実施例の計測器機能ブロック図
である。FIG. 1 (a) is a functional block diagram of a measuring instrument according to an embodiment of the present invention.
複数の計測器のそれぞれにおいて、受信部A13で受信し
た親機からの前記送信要求信号34に含まれる時間データ
32を時間データ認識手段12で認識し時間データをタイマ
手段A14に送出する。更に、遅延時間設定手段からは他
の計測器とは異なる遅延時間がタイマ手段A14に送出さ
れる。同期信号検出手段11は、前記送信要求信号34に含
まれる前記同期データB33を検出すると時間データと遅
延時間との和が設定されたタイマ手段A14をトリガしタ
イマ手段A14はタイマ動作を開始する。タイマ手段A14は
前記時間データ認識手段12から受け取った時間データに
遅延時間設定手段16により設定された他の計測器と異な
る遅延時間を加えた時間が経過するとタイムアップし、
そのタイムアップ信号により計測部17で計測したデータ
を送信部A15より無線送信する。従って、複数の計測器
１、２……ｍがそれぞれ同期の基準より時間データが経
過した時刻t1（送信開始時刻t1）を基準として、そこか
ら、計測器１、２……ｍの遅延時間T6,T7……T8が経過
する毎に計測器１、２……ｍの順で親機に計測データを
送信する。In each of the plurality of measuring instruments, the time data included in the transmission request signal 34 from the master unit received by the receiver A13
32 is recognized by the time data recognition means 12 and the time data is sent to the timer means A14. Further, the delay time setting means sends a delay time different from that of other measuring instruments to the timer means A14. When the synchronization signal detecting means 11 detects the synchronization data B33 included in the transmission request signal 34, it triggers the timer means A14 in which the sum of the time data and the delay time is set, and the timer means A14 starts the timer operation. The timer means A14 is timed up when a time obtained by adding a delay time different from the other measuring devices set by the delay time setting means 16 to the time data received from the time data recognizing means 12,
The data measured by the measuring unit 17 is wirelessly transmitted from the transmitting unit A15 by the time-up signal. Therefore, with respect to the time t 1 (transmission start time t 1 ) when the time data of the plurality of measuring instruments 1, 2, ... Every time the time T 6 , T 7, ... T 8 elapses, the measurement data is transmitted to the master unit in the order of the measuring instruments 1, 2 ... M.
前記受信部A13の間欠受信動作は、前記タイマ手段Ａが
制御する。また遅延時間設定手段16により設定する値
T6,T7……T8（第２図参照）は個々の計測器により異な
り送信が衝突しないように設定する。The timer unit A controls the intermittent receiving operation of the receiving unit A13. The value set by the delay time setting means 16
T (see FIG. 2) 6, T 7 ...... T 8 is set so that the transmission depends on the particular measuring instrument can not collide.
第１図（ｂ）は本発明の実施例の親機機能ブロック図で
ある。親機では、時間データ生成手段19からの時間デー
タに同期信号Ａ及び同期信号Ｂを付け加えて計測データ
要求信号を送信データ生成手段18で作成する。FIG. 1 (b) is a functional block diagram of a master unit according to the embodiment of the present invention. In the parent device, the transmission data generation means 18 creates a measurement data request signal by adding the synchronization signal A and the synchronization signal B to the time data from the time data generation means 19.
親機は、計測器に対して計測データ送信要求をする場合
には、送信データ生成手段18で生成した前記送信要求信
号34を、送信部B20より無線送信する。時間データ生成
手段19は、送信データ生成手段18より送信要求信号のブ
ロックが送出されるごとに時間データを減算し、減算し
た時間データを送信データ生成手段18に送出する。タイ
マ手段B21は送信部B20,受信部B22の動作を制御する。When the master device makes a measurement data transmission request to the measuring instrument, the transmission request signal 34 generated by the transmission data generating means 18 is wirelessly transmitted from the transmission unit B20. The time data generation means 19 subtracts time data each time a block of the transmission request signal is transmitted from the transmission data generation means 18, and transmits the subtracted time data to the transmission data generation means 18. The timer means B21 controls the operations of the transmitter B20 and the receiver B22.
次に第２図を用いて、本発明の実施例の動作タイミング
チャートについて説明を行う。Next, the operation timing chart of the embodiment of the present invention will be described with reference to FIG.
計測器１〜ｍは、受信期間T1、周期T2で間欠受信動作を
行っている。親機からの送信要求信号34を受信出来ない
と、前記受信期間T1、周期T2で間欠受信を繰返す。送信
要求信号34に含まれる同期データＡを受信すると、受信
期間をT3と長くして送信要求信号34を受信する。親機
は、計測器１〜ｍに対して計測データの送信要求を行う
場合、全ての計測器１〜ｍに有効な送信要求信号34を計
測器１〜ｍの間欠周期T2より長いT4期間繰返して送信す
る。計測器１〜ｍは、送信要求信号が存在すると、同期
データA31から始まる送信要求信号34を１ブロック分、T
3期間受信し、前記送信要求信号34に含まれる時間デー
タ32から送信開始時刻t1までの時間を得る。The measuring instruments 1 to m perform the intermittent reception operation in the reception period T 1 and the cycle T 2 . If the transmission request signal 34 from the parent device cannot be received, the intermittent reception is repeated in the reception period T 1 and the cycle T 2 . When the synchronization data A included in the transmission request signal 34 is received, the reception period is lengthened to T 3 and the transmission request signal 34 is received. When requesting the transmission of the measurement data to the measuring instruments 1 to m, the master unit transmits the transmission request signal 34 effective to all the measuring instruments 1 to m to T 4 longer than the intermittent cycle T 2 of the measuring instruments 1 to m. Repeat the period and send. When the transmission request signal is present, the measuring instruments 1 to m transmit the transmission request signal 34 starting from the synchronization data A31 for one block by T
After receiving for three periods, the time from the time data 32 included in the transmission request signal 34 to the transmission start time t 1 is obtained.
親機は、前記送信開始時刻t1よりT5前より受信状態に入
る。各計測器は、前記送信開始時刻t1後、各計測器に順
次与えられた期間（計測器１はT6＋T11、計測器２はT7
＋T11、計測器ｍはT8＋T11）に計測データを送信する。
親機は、T5＋T8＋T11を包括するT9期間受信を継続す
る。The base unit enters the receiving state before T 5 before the transmission start time t 1 . After the transmission start time t 1 , each measuring device has a period (T 6 + T 11 for the measuring device 1 and T 7 for the measuring device 2) sequentially given to each measuring device.
+ T 11 , the measuring instrument m sends the measurement data to T 8 + T 11 ).
The base unit continues reception for the period T 9 including T 5 + T 8 + T 11 .
計測器１〜ｍは計測データの送信が終了するとT10後に
次の親機からの送信要求信号に備えて、受信期間T1、周
期T2で間欠受信を再開する。When the transmission of the measurement data is completed, the measuring instruments 1 to m restart the intermittent reception with the reception period T 1 and the cycle T 2 in preparation for the transmission request signal from the next master unit after T 10 .
この発明は以上説明したように、親機は基準となる送信
開始時刻迄の時間データを含む計測データの送信要求信
号を計測器の間欠受信周期以上繰返して送信し、計測器
は受信した受信要求信号に含まれる時間データから送信
開始時刻を認識し、送信開始時刻後それぞれの計測器に
与えられた一定期間に計測データを送信する通信方式と
した。これにより計測器からの送信信号の衝突による混
信が無くなり、かつ複数の計測器からのデータ収集を短
時間で行える効果がある。As described above, according to the present invention, the master unit repeatedly transmits the measurement data transmission request signal including the time data up to the reference transmission start time for at least the intermittent reception cycle of the measurement device, and the measurement device receives the reception request. The communication method is such that the transmission start time is recognized from the time data included in the signal, and the measurement data is transmitted during a fixed period given to each measuring device after the transmission start time. As a result, there is an effect that interference due to collision of transmission signals from the measuring instruments is eliminated and data can be collected from a plurality of measuring instruments in a short time.
また、無駄な送受信が無くなるために一層の電池寿命の
節約ができるという効果もある。In addition, there is an effect that the battery life can be further saved because unnecessary transmission and reception is eliminated.
第１図（ａ）は本発明の実施例の計測器受機能ブロック
図、第１図（ｂ）は本発明の実施例の親機機能ブロック
図、第２図は本発明の実施例の動作タイミングチャー
ト、第３図は本発明の実施例の親機送信要求信号データ
構成図、第４図は本発明の実施例のシステム図である。 11……同期信号検出手段 12……時間データ認識手段 13……受信部Ａ 14……タイマ手段Ａ 15……送信部Ａ 16……遅延時間設定手段 17……計測部 18……送信データ生成手段 19……時間データ生成手段 20……送信部Ｂ 21……タイマ手段Ｂ 22……受信部Ｂ 31……同期データＡ 32……時間データ 33……同期データＢ 36……親機 1,2……ｍ……計測器 t1……送信開始時刻FIG. 1 (a) is a functional block diagram of a measuring device according to an embodiment of the present invention, FIG. 1 (b) is a functional block diagram of a master unit according to the embodiment of the present invention, and FIG. 2 is an operation of the embodiment of the present invention. 3 is a timing chart, FIG. 3 is a data configuration diagram of a master unit transmission request signal of the embodiment of the present invention, and FIG. 4 is a system diagram of the embodiment of the present invention. 11 …… Synchronous signal detecting means 12 …… Time data recognizing means 13 …… Receiving section A 14 …… Timer means A 15 …… Sending section A 16 …… Delay time setting means 17 …… Measuring section 18 …… Sending data generation Means 19 ...... Time data generating means 20 ...... Sending unit B 21 ...... Timer B 22 ...... Reception unit B 31 ...... Synchronization data A 32 ...... Time data 33 ...... Synchronization data B 36 ...... Main unit 1, 2 …… m …… Measuring instrument t 1 …… Sending start time
Claims (1)
より転送する複数の計測器と、前記複数の計測器から送
信される前記計測データを受信し処理する親機とから構
成される計測データ無線転送装置において、前記親機
は、基準となる送信開始時刻までの時間を示し経時によ
り変化する時間データを生成する時間データ生成手段
と、第一の同期信号と前記時間データと第二の同期信号
とか成る計測データ送信要求信号を前記計測器の間欠受
信周期以上繰り返して生成する送信データ生成手段と、
前記計測データ送信要求信号を前記複数の計測器に送信
する送信部と、前記複数の計測器からの計測データを受
信する受信部とを有し、また前記複数の計測器のそれぞ
れは、前記親機から送信される前記送信要求信号に含ま
れる全ての計測器に共通な基準となる計測データ送信開
始時刻迄の時間を示す前記時間データを認識する時間デ
ータ認識手段と、前記送信要求信号含まれる前記第二の
同期信号を検出する同期信号検出手段と、前記計測デー
タ送信開始時刻から計測データ転送迄での遅延時間を他
の計測器の遅延時間と異なる様に設定する遅延時間設定
手段と、受信部を間欠動作させ、また前記時間データと
他の計測器の遅延時間と異なる遅延時間との和が設定さ
れるタイマ手段とを有しており、それぞれの計測器に於
いて、前記同期信号検出手段からの前記第二同期信号の
タイミングで前記タイマ手段がトリガーされて動作を開
始し、前記計測データ送信開始時刻から遅延時間が経過
すると前記タイマ手段が出力信号を発生し、前記出力信
号により送信部が制御されて前記それぞれの計測器から
の計測データが異なる時間に親機に送信されることを特
徴とする計測データ転送装置。1. Measurement data composed of a plurality of measuring instruments for transferring measurement data by radio signals using weak radio waves and a master unit for receiving and processing the measurement data transmitted from the plurality of measuring instruments. In the wireless transfer device, the master unit, a time data generation unit that generates time data that indicates a time until a reference transmission start time and that changes with time, a first synchronization signal, the time data, and a second synchronization. A transmission data generating means for repeatedly generating a measurement data transmission request signal consisting of a signal for at least the intermittent reception cycle of the measuring instrument,
It has a transmitter that transmits the measurement data transmission request signal to the plurality of measuring instruments, and a receiver that receives the measurement data from the plurality of measuring instruments, and each of the plurality of measuring instruments is the parent device. A time data recognition means for recognizing the time data indicating a time up to a measurement data transmission start time, which is a reference common to all measuring instruments included in the transmission request signal transmitted from a machine, and the transmission request signal is included. Sync signal detecting means for detecting the second sync signal, delay time setting means for setting the delay time from the measurement data transmission start time to the measurement data transfer so as to be different from the delay times of other measuring instruments, The receiving section is operated intermittently, and timer means is provided for setting the sum of the time data and the delay time different from the delay time of other measuring instruments. The timer means is triggered to start the operation at the timing of the second synchronization signal from the detection means, and when the delay time elapses from the measurement data transmission start time, the timer means generates an output signal, and the output signal A measurement data transfer device, characterized in that the transmission unit is controlled to transmit the measurement data from each of the measuring instruments to the master at different times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2179241A JPH07120973B2 (en) | 1990-07-05 | 1990-07-05 | Measurement data wireless transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2179241A JPH07120973B2 (en) | 1990-07-05 | 1990-07-05 | Measurement data wireless transfer device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0468826A JPH0468826A (en) | 1992-03-04 |
| JPH07120973B2 true JPH07120973B2 (en) | 1995-12-20 |
Family
ID=16062412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2179241A Expired - Fee Related JPH07120973B2 (en) | 1990-07-05 | 1990-07-05 | Measurement data wireless transfer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07120973B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9459591B2 (en) | 2011-06-22 | 2016-10-04 | CVEngineering Corporation | Multipoint simultaneous measurement method and multipoint simultaneous measurement system in electric power station, and internal clock used therefor |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07123319B2 (en) * | 1992-04-09 | 1995-12-25 | 松下電器産業株式会社 | Transmission / reception system |
| JP4856407B2 (en) * | 2005-08-10 | 2012-01-18 | 株式会社ミツトヨ | Measurement information transmitter / receiver and measurement system |
| JP2007295249A (en) * | 2006-04-25 | 2007-11-08 | Nippon Telegr & Teleph Corp <Ntt> | Wireless terminal, and wireless communication system |
| JP6182948B2 (en) * | 2013-04-16 | 2017-08-23 | 株式会社村田製作所 | Wireless information acquisition system, parent device of wireless information acquisition system, and child device of wireless information acquisition system |
| JP5807692B2 (en) | 2014-02-27 | 2015-11-10 | 東洋製罐株式会社 | Liquid molded plastic molding |
| JP6748541B2 (en) * | 2016-09-28 | 2020-09-02 | シャープ株式会社 | Communication system, communication device, and communication method |
-
1990
- 1990-07-05 JP JP2179241A patent/JPH07120973B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9459591B2 (en) | 2011-06-22 | 2016-10-04 | CVEngineering Corporation | Multipoint simultaneous measurement method and multipoint simultaneous measurement system in electric power station, and internal clock used therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0468826A (en) | 1992-03-04 |
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