JPH0348704B2 - - Google Patents
Info
- Publication number
- JPH0348704B2 JPH0348704B2 JP57087720A JP8772082A JPH0348704B2 JP H0348704 B2 JPH0348704 B2 JP H0348704B2 JP 57087720 A JP57087720 A JP 57087720A JP 8772082 A JP8772082 A JP 8772082A JP H0348704 B2 JPH0348704 B2 JP H0348704B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal station
- data
- terminal
- transmission
- central control
- 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
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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)
- Computer And Data Communications (AREA)
- Small-Scale Networks (AREA)
Description
【発明の詳細な説明】
本発明はデータ通信ネツトワーク、特にデータ
収集システムにおけるデータ送信方式に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission system in a data communication network, and more particularly in a data collection system.
従来のデータ収集形式のネツトワークにおける
送信権獲得方式には次の２つがある。 There are two methods for acquiring transmission rights in conventional data collection networks:
第１はポーリング方式であり、この方式は、中
央制御局が端局に対し送信するよう勧誘するポー
リング信号を発するもので、端局がデータを送信
したい場合は、このポーリング信号を受信して、
はじめて送信可能となる、いわゆる問合わせ、応
答方式である。この方式の欠点としては、伝送制
御手順が複雑なため端局の処理回路が複雑になる
ことと端局からは任意の時刻に送信アクセスがで
きないことである。 The first is the polling method. In this method, the central control station issues a polling signal inviting the terminal station to transmit data. When the terminal station wants to transmit data, it receives this polling signal and
This is a so-called inquiry/response method that allows transmission for the first time. The disadvantages of this method are that the processing circuit of the terminal station becomes complicated due to the complicated transmission control procedure, and that the terminal station cannot access transmission at any time.
第２は、コンテンシヨン方式であり、この方式
は、ネツトワークに接続されたすべての端局が、
任意の時刻にデータを送信できる。しかし、その
ため２つ以上の端局が同時に送信を開始した場合
には、伝送路上でデータの“衝突”がおこる。こ
れにより各端局からのデータはすべて無効となる
ため各端局共再送を行うことになる。従つて、各
端局からの送信データが集中する時間帯や加入端
局数の多い場合などは、データの衝突頻度がかな
り大きくなり、伝送路の利用効率が大きく低下し
てしまう。 The second method is the contention method, in which all terminal stations connected to the network
Data can be sent at any time. However, if two or more terminal stations start transmitting at the same time, a "collision" of data will occur on the transmission path. As a result, all data from each terminal station becomes invalid, so that each terminal station retransmits the data. Therefore, during times when transmission data from each terminal station is concentrated or when there are a large number of subscriber terminal stations, the frequency of data collisions becomes quite high, and the efficiency of using the transmission path is greatly reduced.
本発明は制御手順及びデータ処理回路が簡単
で、かつ比較的効率良くデータ伝送を行うことが
できる新規なデータ伝送方式の提供を目的とする
ものである。 An object of the present invention is to provide a new data transmission system that has a simple control procedure and data processing circuit, and can perform data transmission relatively efficiently.
添付図面を参照して本発明の一実施例について
説明する。 An embodiment of the present invention will be described with reference to the accompanying drawings.
第１図はシステムの全体構成を示したものであ
り、１は中央制御装置、２は伝送路、３1，…，
３Nは端局であり、各端局は１または複数の端末
４1，…，４ｉを有している。 Figure 1 shows the overall configuration of the system, where 1 is the central control unit, 2 is the transmission line, 3 1 ,...,
3 N is a terminal station, and each terminal station has one or more terminals 4 1 , . . . , 4i.
また、第２図は端局３1，…，３ｎ，…，３N−
１の構成例を示したものである。 In addition, Fig. 2 shows terminal stations 3 1 ,..., 3n,..., 3 N -
This figure shows an example of the configuration of No. 1 .
いま、端末４ｉからのデータが端局３ｎを介し
て中央制御装置１に送られている場合を考える。
このとき、端局３ｎ内部の切換器７は第２図の破
線で示した側にたおれており、この端局３ｎより
も上流側にある端局３N-1，３Nからのデータは全
てここで消去され、端局３ｎからのデータのみが
中央制御装置１に送信されることになる。 Now, consider a case where data from the terminal 4i is sent to the central control device 1 via the terminal station 3n.
At this time, the switch 7 inside the terminal station 3n is tilted to the side shown by the broken line in FIG . The data is erased here, and only the data from the terminal station 3n is transmitted to the central control device 1.
端局３ｎからのデータの送信が終了すると、切
換器７は第２図の実線で示した側にたおれ、上流
側にある端局３N-1，３Nからのデータは中央制御
装置１に送信可能な状態にされる。 When the data transmission from the terminal station 3n is completed, the switch 7 is turned to the side shown by the solid line in FIG . Become ready to send.
なお、第２図において、５はデータ受信器、６
はデータ送信器、８はデータ処理回路である。 In addition, in FIG. 2, 5 is a data receiver, and 6 is a data receiver.
8 is a data transmitter, and 8 is a data processing circuit.
上記のように、本発明では下流側の端局（中央
制御装置に近い端局）がデータ送信の優先権を得
ることになるが、データ送信のタイミングが重な
ると上流側の端局はなかなかデータ送信を完了で
きなくなる不都合が生じる。そこで、優先権を得
にくい上流側の端局は下流側よりも送信頻度を大
きくしてやることによつて平均した受信確率を得
られるようになる。 As described above, in the present invention, the terminal station on the downstream side (terminal station close to the central control unit) gets priority for data transmission, but if the timing of data transmission overlaps, the terminal station on the upstream side will have a hard time receiving the data. This causes the inconvenience of not being able to complete the transmission. Therefore, the upstream terminal station, which is difficult to obtain priority, can obtain an average reception probability by making the transmission frequency higher than that of the downstream terminal station.
また、受信確率を均一化する他の方法として
は、各端局毎にそれぞれ異なるパターンの乱数ブ
ロツクを持たせ、その乱数周期で送信を行う方法
もある。 Another method for equalizing the reception probabilities is to provide each terminal station with a random number block with a different pattern, and to transmit data at the random number period.
本発明によれば、各端末はデータ送信周期に基
づき伝送路上にいつでもデータを送り込むことが
できるランダムアクセス方式であるにもかかわら
ず、従来の方式で見られるようなデータの衝突は
生じない。そのため、データ衝突後のいろいろな
処理、制御などを考える必要がなく、簡単な伝送
制御で実現できる。さらに各端局は、簡単な構成
で、経済性にも優れている。 According to the present invention, although the random access method is used in which each terminal can send data onto the transmission path at any time based on the data transmission cycle, data collisions that occur in conventional methods do not occur. Therefore, there is no need to consider various processes and controls after a data collision, and this can be achieved with simple transmission control. Furthermore, each terminal station has a simple configuration and is highly economical.
また、端局の送信優先権と端局の送信周期の調
和をはかることにより、各端局に平等な送信権を
持たせることができる。 Further, by harmonizing the transmission priority of the terminal stations and the transmission period of the terminal stations, it is possible to give each terminal station equal transmission rights.
第１図は本発明の一実施例の全体構成図、第２
図は端局の一実施例の説明図である。
１…中央制御装置、２…伝送路、３…端局。
Fig. 1 is an overall configuration diagram of an embodiment of the present invention, Fig. 2
The figure is an explanatory diagram of an embodiment of a terminal station. 1...Central control device, 2...Transmission line, 3...Terminal station.
Claims (1)
収集かつ処理する中央制御装置とを伝送路で直列
に結んでなり、各端局からのデータ送信頻度を、
中央制御装置に対して遠くにある端局ほど大きく
し、一つの端局がデータを送信するときは、当該
端局内の切換器を切換えることによつて、当該端
局よりも上記中央制御装置に対して遠くにある上
流側の端局から送信されたデータを当該端局にお
いて全て消去し、自らのデータを中央制御装置に
送信し、当該端局がデータを送信しないときは、
当該端局内の切換器を元に戻すことによつて、当
該端局よりも上流側の端局から送信されたデータ
を下流側の中央制御装置に送信することを特徴と
するデータ送信方式。1 A plurality of terminal stations and a central control unit that collects and processes data from the plurality of terminal stations are connected in series through a transmission line, and the frequency of data transmission from each terminal station is controlled by
The farther the terminal station is from the central control device, the larger the size, and when one terminal station sends data, by switching the switch within that terminal station, the distance from the terminal station to the central control device is increased. On the other hand, if the terminal station erases all data sent from a distant upstream terminal station, transmits its own data to the central controller, and the terminal station does not transmit data,
A data transmission method characterized in that data transmitted from a terminal station upstream of the terminal station is transmitted to a central control device downstream of the terminal station by returning the switch in the terminal station to its original state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57087720A JPS58204656A (en) | 1982-05-24 | 1982-05-24 | Data transmitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57087720A JPS58204656A (en) | 1982-05-24 | 1982-05-24 | Data transmitting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58204656A JPS58204656A (en) | 1983-11-29 |
| JPH0348704B2 true JPH0348704B2 (en) | 1991-07-25 |
Family
ID=13922738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57087720A Granted JPS58204656A (en) | 1982-05-24 | 1982-05-24 | Data transmitting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58204656A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62239639A (en) * | 1986-04-10 | 1987-10-20 | Nec Corp | Data collection system |
| GR880100760A (en) * | 1988-11-10 | 1990-12-31 | Telefonica Nacional Espana Co | Flexible interconnection system of electronic equipment |
-
1982
- 1982-05-24 JP JP57087720A patent/JPS58204656A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58204656A (en) | 1983-11-29 |
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