JPH02226092A - Data communication system - Google Patents
Data communication systemInfo
- Publication number
- JPH02226092A JPH02226092A JP1045231A JP4523189A JPH02226092A JP H02226092 A JPH02226092 A JP H02226092A JP 1045231 A JP1045231 A JP 1045231A JP 4523189 A JP4523189 A JP 4523189A JP H02226092 A JPH02226092 A JP H02226092A
- Authority
- JP
- Japan
- Prior art keywords
- time
- data communication
- station
- response
- compensation
- 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.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims abstract description 62
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000012937 correction Methods 0.000 claims description 16
- 238000012790 confirmation Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Communication Control (AREA)
- Selective Calling Equipment (AREA)
- Electric Clocks (AREA)
- Multi Processors (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、共通時刻の設定が可能なデータ通信システム
に間し、特に、伝送Ｊ！！！！間を補正して時刻設定を
行なうことが可能なデータ通信システムに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a data communication system in which a common time can be set, and in particular, to a data communication system capable of setting a common time. ! ! ! The present invention relates to a data communication system that can set time by correcting the time difference.
［従来の技術］
近年、データ通信装置が主局と従局をなし、当該データ
通信装置間をネ・ントワークで接続したデータ通信シス
テムが利用されている。[Prior Art] In recent years, data communication systems have been used in which data communication devices serve as a master station and a slave station, and the data communication devices are connected through a network.
ところで、従来のデータ通信システムでは、各データ通
１８装置ごとに独立して時刻設定されるとともに、独立
に計時しており、他のデータ通信装置から時刻設定され
ると、あらかじめ設定さオτていた時刻と他のデータ通
信装置から受信した時刻との差を補正値とし、この補正
値によって計時処理を行なっていた。By the way, in conventional data communication systems, each of the 18 data communication devices independently sets the time and measures the time independently, and when the time is set from another data communication device, the preset time is automatically set. The difference between the received time and the time received from another data communication device is used as a correction value, and the time measurement process is performed using this correction value.
［解決すべき課！ｉ］
上述した従来のデータ通信システムは、伝送遅延時間を
考慮しておらず、伝送遅延が生じても、その影響を補正
して時刻同期を取ることができなかったため、伝送Ｍ延
が大きく、その影響を簾視できない場合には時刻同期の
精度を許容限度内に押さえることができないという課題
があった。[A problem to be solved! i] The conventional data communication system described above does not take transmission delay time into consideration, and even if a transmission delay occurs, it is not possible to correct the influence and achieve time synchronization, so the transmission M delay is large. If the influence cannot be overlooked, there is a problem in that the accuracy of time synchronization cannot be kept within the permissible limit.
本発明は、上記ｒ１Ｍにかんがみてなされたもので、伝
送Ｊ！！延が大きい場合でも、時刻同期の精度を許容限
度内に押さえることが可能なデータ通信システムの提供
を目的とする。The present invention has been made in view of the above r1M, and is based on the transmission J! ! The present invention aims to provide a data communication system capable of keeping the accuracy of time synchronization within an allowable limit even when the delay is large.
［ｆｆ、ｄの解決手段］
上記目的を達成するため、本発明のデータ通信システム
は、主局と従局とをネットワークを介して接続するとと
もに、上記主局は、上記ネットワークを介して上記従局
に時刻設定を行なわしめる主局側時刻同期手段と、時刻
設定の開始から設定確認を受信するまでの時間を計数し
、伝送！Ｘ延時間として記憶する伝送ｊ！延待時間計数
記憶手段、上記伝送遅延時間にもとづいて上記主局側時
刻同期手段による時刻設定の時刻を補正する設定時刻補
正手段とを備え、上記従局は、上記ネットワークを介し
て上記主局から時刻設定されると当該時刻を設定する従
局倒時刻同朋手段と、時刻設定を受けると上記ネットワ
ークを介して上記主局に設定確認を送信する設定確認返
送手段とを備えた構成としである。[Means for solving ff, d] In order to achieve the above object, the data communication system of the present invention connects a master station and a slave station via a network, and the master station connects the slave station via the network. The time synchronization means on the main station side performs the time setting, and the time from the start of time setting until receiving the setting confirmation is counted and transmitted! Transmission j to be stored as X extension time! A delay time counting storage means, a setting time correction means for correcting the time set by the master station side time synchronization means based on the transmission delay time, and the slave station receives information from the master station via the network. The main station is configured to include a slave station failure time synchronizing means for setting the time when the time is set, and a setting confirmation return means for transmitting a setting confirmation to the master station via the network when the time is set.
かかる構成とすることにより、主局となるデータ通信装
置から従局となるデータ通信装置へ時刻設定を行なうと
き、時刻同期の主局となるデータ通信装置は、従局とな
るデータ通信装置に計数する時刻を送信してから応答が
返されるまでの時間を計数して伝送遅延時間を検出する
とともに、この伝送遅延時間にもとづいて当該従局に対
する計数時刻設定値を補正してから時刻設定コマンドを
送信している。With this configuration, when the time is set from the data communication device serving as the master station to the data communication device serving as the slave station, the data communication device serving as the master station for time synchronization sets the time to be counted to the data communication device serving as the slave station. The transmission delay time is detected by counting the time from sending the message until a response is returned, and based on this transmission delay time, the counting time setting value for the slave station is corrected, and then the time setting command is sent. There is.
［実施例］ 以下、図面にもとづいて本発明の詳細な説明する。[Example] Hereinafter, the present invention will be explained in detail based on the drawings.
第１図は、本発明の一実施例に係るデータ通信システム
のブロック図である。FIG. 1 is a block diagram of a data communication system according to an embodiment of the present invention.
同図において、１０は主局となるデータ通信装置、２０
は従局となるデータ通信装置、３０は主局データ通信装
置ＩＯと従局データ通信！装置２０とを接続するデータ
通信ネットワーク（以下、ネットワークという、）であ
る、ここで、時刻同期の主局となるデータ通信装置ｌＯ
内には、時計装置１１と通信制御装置１２と時刻補正演
算装置１３と応答時間計数装置１４と応答時閉記憶装置
１５とを備えている。そして、時刻補正演算装置１３は
、時計装置１１から出力される時刻を応答時間記憶装置
１５において従局ごとに記憶された応答時間にもとづい
て補正演算を行なう、また、その結果は、時刻設定コマ
ンドとして通信ｉ／ＪＷ装置１２からデータ通信ネット
ワーク３０を経由して従局データ通信装置２０へ送信さ
れる。In the figure, 10 is a data communication device serving as a main station;
is a data communication device that becomes a slave station, and 30 is a data communication device between the master station data communication device IO and the slave station! A data communication network (hereinafter referred to as a network) that connects the device 20 to the data communication device lO, which serves as the main station for time synchronization.
Inside, there is provided a clock device 11, a communication control device 12, a time correction calculation device 13, a response time counting device 14, and a response closing storage device 15. Then, the time correction calculation device 13 performs a correction calculation on the time output from the clock device 11 based on the response time stored for each slave station in the response time storage device 15, and the result is sent as a time setting command. It is transmitted from the communication i/JW device 12 to the slave data communication device 20 via the data communication network 30.
一方、従局データ通信装置２０内には、時計装置１２と
通信制御装置２２を備えている。そして、通信制御装置
２２によって主局データ通信装置１０から送信された時
刻設定コマンドを受信し、当該コマンドによって指示さ
れる時刻に時計装置２１の計数値を設定するとともに、
設定確認の応答を通信制ｉ＃装置２２から主局データ通
信装置１０に返送する。On the other hand, the slave data communication device 20 includes a clock device 12 and a communication control device 22. Then, the communication control device 22 receives the time setting command transmitted from the main station data communication device 10, and sets the count value of the clock device 21 to the time specified by the command, and
A setting confirmation response is sent back from the communication system i# device 22 to the main station data communication device 10.
従って、主局データ通信装置１０では、伝送遅延時間の
検出を行なった後、補正後に再度、時刻設定を行なうこ
とになる。すなわち、通信制御＃装置１２は、上記シー
ケンスで時刻設定コマンドを送信してから応答が返され
るまでの時間を応答時間計数装置１４で計数させ、計数
出力を応答時間記憶装置１５に記憶させてから、再度、
時刻設定を行なう。Therefore, in the main station data communication device 10, after detecting the transmission delay time, the time setting is performed again after correction. That is, the communication control #device 12 causes the response time counting device 14 to count the time from when the time setting command is sent to when a response is returned in the above sequence, and stores the counted output in the response time storage device 15. ,again,
Set the time.
以下、これをより具体的に説明する。This will be explained in more detail below.
まず、最初に伝送遅延時間を検出するとき、すなわち、
時刻同期の初回においては応答時間が未知数であるため
、応答時間記憶装置１５を期間化しておく、従って、時
刻補正演算装置１３で何ら補正をすることなく従局に対
して時刻設定を行なう、そして、従局からの榛答までを
計数し、伝送遅延時間として応答時間記憶装置１５で記
憶する。First, when first detecting the transmission delay time, i.e.
At the first time of time synchronization, the response time is unknown, so the response time storage device 15 is set as a period. Therefore, the time is set for the slave station without any correction in the time correction calculation device 13, and The response time from the slave station is counted and stored in the response time storage device 15 as the transmission delay time.
一方、時刻同期の二回目以降は、応答時間が既知数とな
るので、応答時間記憶装置１５に記憶された値を補正値
として時刻補正演算装置１３にて補正演算を行なう。On the other hand, after the second time synchronization, since the response time becomes a known number, the time correction calculation device 13 performs correction calculation using the value stored in the response time storage device 15 as a correction value.
ここで、データ通信ネットワーク３０を介して時刻設定
コマンドとその応答を主局データ通信装置１０と従局デ
ータ通信装置２０との間で送受信するにあたり、上記時
刻設定コマンドと応答の電文長が同一であり、かつ、デ
ータ通信ネットワーク３０中の電文経路が送受信ともに
同一であれば、このネットワーク３′０の伝送遅延時間
は概ね送受信とも等しいと考えることができる。このこ
とから、上述した補正演算は応答時間記憶装置１５に記
憶された値の１／２を加算する演算とすることで実用上
十分な精度を得ることができる。Here, when transmitting and receiving the time setting command and its response between the master data communication device 10 and the slave data communication device 20 via the data communication network 30, the message length of the time setting command and the response are the same. , and if the message path in the data communication network 30 is the same for both transmission and reception, it can be considered that the transmission delay time of this network 3'0 is approximately the same for both transmission and reception. Therefore, by performing the above-mentioned correction calculation by adding 1/2 of the value stored in the response time storage device 15, sufficient accuracy for practical use can be obtained.
このように本実施例では、他のデータ通信装置との閏で
データ通信を行なう手段と、当該手段によって受信した
時刻にもとづいて時刻を計数する手段とを惟えたデータ
通信装置をネットワークを介して接続してデータ通信シ
ステムを構成するとともに、時刻同期の主局となるデー
タ通信装置では、時刻同期の従局となるデータ通信装置
へ計数する時刻を送信する時刻同期手段と、この送信の
後、従局となるデータ通信装置から設定確認の応答が返
されるまでの時間を伝送遅延時間として計数し、記憶し
ておく手段と、従局となるデータ通信装置へ送信する時
刻をこの記憶値にもとづいて補正する手段を備え、従局
となるデータ通信装置では、計数する時刻を受信すると
設定確認を応答として返送する手段とを備えている。As described above, in this embodiment, a data communication device equipped with a means for performing data communication with another data communication device and a means for counting time based on the time received by the means is connected via a network. The data communication device that connects to form a data communication system and serves as the master station for time synchronization has a time synchronization means that transmits the time to be counted to the data communication device that serves as the slave station for time synchronization, and after this transmission, the slave station The time it takes for a configuration confirmation response to be returned from the data communication device is counted as the transmission delay time, and the means for storing it and the time at which it is sent to the slave data communication device are corrected based on this stored value. The slave data communication device includes means for returning a setting confirmation as a response upon receiving the time to be counted.
そして、主局となるデータ通信装置では、時刻設定を行
なう隙、計数する時刻を送信するにあたり、伝送遅延時
間にもとづく補正を行なってから送信している。The data communication device serving as the main station performs a correction based on the transmission delay time before transmitting the time to be counted while setting the time.
［発明の効果コ
以上説明したように本発明は、主局データ通信装置から
他の従局データ通信装置へ時刻設定を行なう隙、各従局
ごとに応答が返されるまでの時間を計数して記憶してお
き、設定時刻を補正してから時刻設定コマンドとして送
信しているため、時刻設定コマンドのネットワーク中に
おけろ伝送遅延時間が無視できないような場合でも高精
度な時刻同期を行なうことが可能なデータ通信システム
を提供できるという効果がある。[Effects of the Invention] As explained above, the present invention calculates and stores the time until a response is returned from each slave station during the time setting from the master station data communication device to other slave data communication devices. Since the set time is corrected before being sent as a time setting command, highly accurate time synchronization can be performed even when the transmission delay of the time setting command cannot be ignored in the network. This has the effect of providing a data communication system.
第１図は本発明の一実施例に係るデータ通信システムの
ブロック図である。
１０゜
ｌ ｌ。
！２゜
１３ ：
ｌ ４：
ｌ ５ ：
３０ ：
２０：データ通信装置
２１コ時計装置
２２：通信制ｉｓｉ置
時刻補正演算装置
応答時間計数装置
応答時間記憶装置
データ通信ネットワークFIG. 1 is a block diagram of a data communication system according to an embodiment of the present invention. 10゜l. ! 2゜13: l 4: l 5: 30: 20: Data communication device 21 Clock device 22: Communication system ISI time correction calculation device Response time counter Response time storage device Data communication network
Claims (1)
トワークを介して接続したデータ通信システムにおいて
、上記主局は、上記ネットワークを介して上記従局に時
刻設定を行なわしめる主局側時刻同期手段と、時刻設定
の開始から設定確認を受信するまでの時間を計数し、伝
送遅延時間として記憶する伝送遅延時間計数記憶手段と
、上記伝送遅延時間にもとづいて上記主局側時刻同期手
段による時刻設定の時刻を補正する設定時刻補正手段と
を有し、上記従局は、上記ネットワークを介して上記主
局から時刻設定されると当該時刻を設定する従局側時刻
同期手段と、時刻設定を受けると上記ネットワークを介
して上記主局に設定確認を送信する設定確認返送手段と
を有することを特徴とするデータ通信システム。In a data communication system in which a master station and a slave station having a timekeeping means and a communication control means are connected via a network, the master station has a time synchronization means on the master station side that causes the slave station to set time via the network. , a transmission delay time counting storage means for counting the time from the start of time setting until receiving a setting confirmation and storing it as a transmission delay time; and a time setting by the main station side time synchronization means based on the transmission delay time. The slave station has a set time correction means for correcting the time, and the slave station has a slave side time synchronization means for setting the time when the time is set from the master station via the network, and a slave side time synchronization means that sets the time when the time is set from the master station via the network, and and a setting confirmation return means for transmitting a setting confirmation to the main station via the main station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1045231A JPH02226092A (en) | 1989-02-28 | 1989-02-28 | Data communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1045231A JPH02226092A (en) | 1989-02-28 | 1989-02-28 | Data communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02226092A true JPH02226092A (en) | 1990-09-07 |
Family
ID=12713487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1045231A Pending JPH02226092A (en) | 1989-02-28 | 1989-02-28 | Data communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02226092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04359189A (en) * | 1991-06-04 | 1992-12-11 | Hokuriku Electric Power Co Inc:The | Reference time signal synchronizing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071981A (en) * | 1983-09-29 | 1985-04-23 | Fujitsu Ltd | Remote time setting system |
-
1989
- 1989-02-28 JP JP1045231A patent/JPH02226092A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071981A (en) * | 1983-09-29 | 1985-04-23 | Fujitsu Ltd | Remote time setting system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04359189A (en) * | 1991-06-04 | 1992-12-11 | Hokuriku Electric Power Co Inc:The | Reference time signal synchronizing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5566180A (en) | Method for recognizing events and synchronizing clocks | |
| US4549297A (en) | Data retransmitting system | |
| EP2057765B1 (en) | Coordinated timing network configuration parameter update procedure | |
| JPS60150345A (en) | One point vs. multipoint communicating method and device | |
| JPH10509294A (en) | System with predetermined timing relationship between data input and output, and transmitter and receiver of such system | |
| JPH02226092A (en) | Data communication system | |
| JPH025654A (en) | Signal synchronizing system | |
| JP3571218B2 (en) | Synchronous operation system | |
| JPS6352089A (en) | Time synchronizing system for network | |
| JPS6363238A (en) | Timing device for network system | |
| JP2560141B2 (en) | Data compensation method in asynchronous data transfer | |
| JPH05161181A (en) | Time synchronization system | |
| JPS616953A (en) | Timer correcting system | |
| US20240089021A1 (en) | System and methods for network data processing | |
| JPH04121691A (en) | Remote time setting method | |
| JPS61142831A (en) | Time division multiplexer | |
| SU1078421A2 (en) | Data exchange device | |
| JPH04275611A (en) | Information processing system | |
| JP2827284B2 (en) | Network time adjustment method | |
| CN117544266A (en) | Error compensation method for enhancing time synchronization port | |
| JP2643832B2 (en) | Propagation delay measurement method | |
| JPH0472837A (en) | Data transmission delay adjustment system | |
| JPH0435934B2 (en) | ||
| JPH02288750A (en) | Inter-node time matching system | |
| JPH0758999B2 (en) | How to match clocks in communication network systems |