JPS58114545A - Equality type loop communication system - Google Patents

Abstract

PURPOSE:To attain efficient loop communication, by providing a means which can communicate plural stations each other at an arbitrary time, in a loop communication system. CONSTITUTION:In the communication from a station A to C, the station A uses a loop back connection toward a station F, and returns data from the station F to the station F. The station C stops the relay function of data from the station A and blocks the data transmission to the station D. That is, the data between the stations A and C is relayed at a station B and flows as shown in the arrow 2. Thus, when the station D obtains the right of transmission and makes transmission to the station F, the communication is done as shown in the arrow 2. If the station D transmits to the station B, since loop back is executed at the station A, it is easily known that the other communication is executed on the way to the station B.

Description

【発明の詳細な説明】 （１）発明の技術分野 本発明は相互に対等な局同士が複数局同一回線上にルー
プ状に接続され１対の局同士が通信するループ通信方式
に於ける接続方式に関する。Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to connection in a loop communication system in which a plurality of mutually equal stations are connected in a loop on the same line and a pair of stations communicate with each other. Regarding the method.

（２）技術の背景 本発明は相互に対等な局、例えばいわゆるミニコン、パ
ソコン及びオフィスオートメーション用ワークステーシ
ョン等が相互に通信する場合対等なし１係となり、同−
回Ｇ上にループ状に接続して通信を行なう時は対等型の
ループ通信方式が要求される。この場合酸る一時点では
１対の局同士の間でのみ通信が行なわれるのが通常であ
った。即ち送信櫂ヲ取った局のみが他の局に通信を行な
う事が可能で、その送信権はループ上で１つに限定され
る。若し複数の送信ｆを許せばループ上でデータのぶつ
かシ合いが生する場合がある。これをさける為にはルー
プ上での相互の接続関係を予め知っておき、更にその時
点で通信中の局とループ上の空き区間とを知る必要があ
るが、この制御は非常に複雑であシ簡単なループ通信方
式に於ける接続方式の出現が望１れている。(2) Background of the Technology The present invention provides that when mutually equal stations, such as so-called minicomputers, personal computers, office automation workstations, etc., communicate with each other, they act as two equal parties.
When communicating in a loop on the circuit G, a peer-to-peer loop communication system is required. In this case, at a certain point in time, communication was usually carried out only between a pair of stations. That is, only the station that has taken over the transmitter can communicate with other stations, and the right to transmit is limited to one on the loop. If multiple transmissions f are allowed, data collisions may occur on the loop. In order to avoid this, it is necessary to know in advance the mutual connection relationship on the loop, and also to know which stations are communicating at that time and the vacant sections on the loop, but this control is extremely complex. It is hoped that a simple connection system for loop communication will emerge.

（３）従来技術と問題点 相互に対等な局同士を複数局同一回線上にループ状に接
続した場合の一例を第１図に示す。Ａ。(3) Prior Art and Problems FIG. 1 shows an example of a case where a plurality of mutually equal stations are connected in a loop on the same line. A.

Ｂ、　　Ｃ，Ｄ、　　Ｅ、　Ｆは対等な局である。１は
ループ状にＡ−Ｆ局を接続する回線である。通信信号電
流即ちデータの流れる方向は矢印の如くであるとすれば
、今Ａ局が０局と通信していれば残シのＢ、　Ｄ、　　
Ｅ、　Ｆ局はデータを中継するのみである。B, C, D, E, and F are equal stations. 1 is a line connecting A to F stations in a loop. Assuming that the communication signal current, that is, the direction in which data flows, is as shown by the arrow, if station A is currently communicating with station 0, the remaining stations B, D,
Stations E and F only relay data.

この場合Ａ及びＣ局間にあるＢ局は中継するのみでも止
むを得ないとしても残ｊ５Ｄ−Ｆ局間ではデータの流れ
方によれば通信可能であるが前記の如くその制御は複雑
である。従って従来技術に於いてはループ回線の効率が
悪く、若しループ回線の効率を良くしようとすれば複雑
な制御を行なわねばならぬ欠点を有す。In this case, even if it is unavoidable that the B station between the A and C stations only relays the data, communication is possible between the remaining J5D and F stations depending on the data flow, but as mentioned above, the control is complicated. . Therefore, in the prior art, the efficiency of the loop line is poor, and if the efficiency of the loop line is to be improved, complicated control must be performed.

（４）発明の目的 本発明の目的は上記欠点を除くためループ回線の障害時
に行なわれるループバック機能を利用し容易に複数の送
信権を与えループ回線の効率向上を複雑な制御を要さず
に実現する手段を提供することにある。(4) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks by utilizing the loopback function that is performed in the event of a failure of the loop line, easily granting multiple transmission rights, and improving the efficiency of the loop line without requiring complicated control. The goal is to provide the means to achieve this goal.

（５）発明の構成 第２図に従い本発明の詳細な説明する。第２図に於いて
Ａ−Ｆは局で１はループ回線である。(5) Structure of the Invention The present invention will be explained in detail with reference to FIG. In FIG. 2, A-F are stations and 1 is a loop line.

今Ａ局よ９０局に通信中の場合Ａ局はＦ局側をループバ
ック接続としてＦ局側よシ来るブータラＦ局へ返送する
。Ｃ局はＡ局よりのデータの中継機能を停止しＤ局側へ
のデータ送出を阻止する。即ちＡ局とＣ局間のデータは
Ｂ局で中継されるのみで２で示す矢印の如く流れる。従
ってＤ局が送信権を得てＦ局へ送信する場合３で示す矢
印の如く通信することが出来る。若しＤ局がＢ局へ送信
する場合はＡ局でループバックされるだめＢ局迄の途中
で他の通信が行なわれていることが容易に判明する。If the A station is currently communicating with 90 stations, the A station connects the F station as a loopback connection and sends back to the bootara F station coming from the F station. Station C stops relaying data from station A and prevents data from being sent to station D. That is, data between stations A and C is only relayed by station B and flows as shown by the arrow 2. Therefore, when station D obtains the transmission right and transmits to station F, it can communicate as shown by the arrow 3. If station D transmits to station B, it will be looped back at station A, and it will be easy to see that other communication is occurring on the way to station B.

（６）発明の実施例 第３図は本発明の一実施例を示す回路のブロック図であ
る。回線２９．３０は現用のループ回線で回線３１．３
２は現用回線障害時に切替えて用いる予備回線である。(6) Embodiment of the Invention FIG. 3 is a block diagram of a circuit showing an embodiment of the invention. Line 29.30 is the current loop line and line 31.3
2 is a protection line that is switched over and used in the event of a failure in the working line.

データを中継している場合は回線２９よシデータはルー
プ制御部５のレシーバ８に入りＡＮＤ回路９を経て１ビ
ツトバツフア１１に入る。ここでデータは１ビツト遅れ
てＡＮＤ回路１３、ＯＲ回路１４を経てドライバ１５に
より回線３０へ送出される。送信を開始したい局は送信
制御部６のアイドル検出回路２４により１ビツトバツフ
ア１１をデータが流れているかどうか判足し、データが
流れていなければフレーム送信制御回路２５を起動しル
ープバック制御回路２３３− の出力をオンとしてループ制御部５のＮＯＴ回路２１を
オフとしてＡＮＤ回路２０の出力をオフとし１ビツトバ
ツフア１７の出力ｔｔｍ止、する。又、ＮＯＴ回路１０
の出力をオフとしＡＮＤ回路９の出力をオフとしてレシ
ーバ８の出力を阻止する。When data is being relayed, the data from the line 29 enters the receiver 8 of the loop control section 5, passes through the AND circuit 9, and enters the 1-bit buffer 11. Here, the data is transmitted to the line 30 by the driver 15 via the AND circuit 13 and the OR circuit 14 with a delay of one bit. A station that wants to start transmission uses the idle detection circuit 24 of the transmission control unit 6 to determine whether data is flowing through the 1-bit buffer 11. If no data is flowing, it activates the frame transmission control circuit 25 and controls the loopback control circuit 233-. The output is turned on, the NOT circuit 21 of the loop control section 5 is turned off, and the output of the AND circuit 20 is turned off, thereby stopping the output ttm of the 1-bit buffer 17. Also, NOT circuit 10
The output of the AND circuit 9 is turned off to block the output of the receiver 8.

又ＡＮＤ回路１８をオンとしてＯＲ回路１９を経てレシ
ーバ８の出力をドライバ２２に接続して回線３２に送出
しループバックを形成する。送信制御部６のフレーム送
信制御回路２５はループ制御部５のＯＲ回路１４を経て
ドライバ１５に送信データを送シ回ｍ３０へ送出する。Furthermore, the AND circuit 18 is turned on, and the output of the receiver 8 is connected to the driver 22 via the OR circuit 19 and sent to the line 32 to form a loopback. The frame transmission control circuit 25 of the transmission control section 6 sends the transmission data to the driver 15 via the OR circuit 14 of the loop control section 5 at a transmission time m30.

若し送信したい対向局が通信中の局か又は通信中の局の
間にあってデータの中継をしている局の場合は回Ｉｗ３
０へ送出したデータはループバックされて回線３１よリ
レシーバ１６へ戻ってくる。レシーバ１６の出力は１ビ
ツトバツフア１７によ、９ＡＮＤ回路２０へ送られるが
前記の如（ＡＮＤ回路はオフとなっているので戻って来
たデータはここで阻止される。If the opposite station to which you want to send is a station that is currently communicating or a station that is relaying data between stations that are currently communicating, turn Iw3.
The data sent to 0 is looped back and returned to the re-receiver 16 via the line 31. The output of the receiver 16 is sent to the 9AND circuit 20 by the 1-bit buffer 17, but as described above (the AND circuit is off, the returned data is blocked here).

一方１ビットバッファ１７よシ受信制御部７のフレーム
受信制御回路２８へ入った送信データによ４− 多対内局が他の通信区間に入っていることが判明する。On the other hand, the transmission data that has entered the frame reception control circuit 28 of the reception control section 7 from the 1-bit buffer 17 reveals that the 4-multiple internal station is in another communication section.

送信すべきデータの送出が完了すると送信制御部６のフ
レーム送信制御回路２５はループバック制御回路２３を
リセットし、その出力をオフとしてループ制御部５を元
の中継機能に戻す。When the transmission of the data to be transmitted is completed, the frame transmission control circuit 25 of the transmission control section 6 resets the loopback control circuit 23, turns off its output, and returns the loop control section 5 to its original relay function.

データを受信する場合はループ制御部５の１ビツトバツ
フア１１よシ受信制御部７のフラグアドレス検出回路２
７に入ったフラグアドレスによシ自局宛のデータである
ことが検出されると、フラグアドレス検出回路２７はフ
レーム受信制御回路２８を起動して１ビツトバツフア１
１よシのデータを受信させる。同時に中継制御回路２６
を起動し、その出力をオンとしてＮＯＴ回路１２の出力
をオフとしＡＮＤ回路１３をオフとして１ビツトバツフ
ア１１の出力を阻止する。データの受信が完了するとフ
レーム受信制御回路２８は中継制御回路２６をリセット
し、その出力をオフとしてループ制御部５を元の中継機
能に戻す。When receiving data, the 1-bit buffer 11 of the loop control section 5 and the flag address detection circuit 2 of the reception control section 7 are used.
When it is detected that the data is addressed to the own station based on the flag address entered in 7, the flag address detection circuit 27 activates the frame reception control circuit 28 and transfers the 1-bit buffer 1.
Receive data from 1. At the same time, the relay control circuit 26
is activated, its output is turned on, the output of the NOT circuit 12 is turned off, and the AND circuit 13 is turned off, thereby blocking the output of the 1-bit buffer 11. When data reception is completed, the frame reception control circuit 28 resets the relay control circuit 26, turns off its output, and returns the loop control section 5 to its original relay function.

（７）発明の効果 以上説明した如く本発明は従来１対の局のみ通信が可能
であった対等型ループ通信方式に於いて、複数対の局が
任意の時間に同時に通信することが可能であシ、シかも
簡単な制御で実現し得ることによシ効率の良いループ通
信を笑現し得る効果は大なるものがある。(7) Effects of the Invention As explained above, the present invention enables multiple pairs of stations to communicate simultaneously at any time in the peer-to-peer loop communication system, where conventionally only one pair of stations could communicate. The fact that this can be achieved with simple control has a great effect in achieving highly efficient loop communication.

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

第１し１は相互に対等女局同士を複数局同一回線上にル
ープ状に接続した場合の一例を示す図、第２図は本発明
の詳細な説明する図、第３図は本発明の一笑施例を示す
回路のブロック図である。 ５はループ制御部、６は送信制御部、７は受信制御部、
８，１６はレシーバ、１１．１７は１ピツトバツフア、
１５．２２はドライバ、２３はループバック制御回路、
２４はアイドル検出回路、２５はフレーム送信制御回路
、２６は中継制御回路、２７はフラグアドレス制御回路
、２８はフレーム受信制御回路である。 ％１図 晃２図1 is a diagram showing an example of a case where two or more equal female stations are connected in a loop on the same line, FIG. 2 is a diagram explaining the present invention in detail, and FIG. 3 is a diagram showing the present invention in detail. FIG. 2 is a block diagram of a circuit showing an example. 5 is a loop control section, 6 is a transmission control section, 7 is a reception control section,
8 and 16 are receivers, 11.17 is 1 pit buffer,
15. 22 is a driver, 23 is a loopback control circuit,
24 is an idle detection circuit, 25 is a frame transmission control circuit, 26 is a relay control circuit, 27 is a flag address control circuit, and 28 is a frame reception control circuit. %1 figure ko2 figure

Claims (1)

【特許請求の範囲】[Claims] 相互に対等な局同士を沙数局同−回線上にループ状に接
続し、１対の局同士が通信するループ通信方式に於いて
、任意の時間に複数組の局同士が同時に通信し得る手段
を設けた事をｔ￥ｆ徴とする対等型ループ通信方式。In a loop communication method in which mutually equal stations are connected in a loop on the same line and a pair of stations communicate with each other, multiple sets of stations can communicate with each other at the same time at any given time. A peer-to-peer loop communication method that is characterized by the provision of a means.