JPS636186B2 - - Google Patents
Info
- Publication number
- JPS636186B2 JPS636186B2 JP55110114A JP11011480A JPS636186B2 JP S636186 B2 JPS636186 B2 JP S636186B2 JP 55110114 A JP55110114 A JP 55110114A JP 11011480 A JP11011480 A JP 11011480A JP S636186 B2 JPS636186 B2 JP S636186B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- request signal
- transmission request
- station
- time
- 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 150
- 238000000034 method Methods 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
- G06F13/368—Handling requests for interconnection or transfer for access to common bus or bus system with decentralised access control
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Bus Control (AREA)
- Computer And Data Communications (AREA)
- Small-Scale Networks (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、複数の主局が伝送線路を共有して時
分割でデータ伝送を行う場合の伝送方式に係り、
特に主局間の伝送が競合した場合の調停に関す
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transmission system in which a plurality of main stations share a transmission line and perform data transmission in a time-division manner.
In particular, it relates to arbitration in the case of conflicting transmissions between main stations.
（従来の技術及びその問題点）
複数の主局が伝送線路を共有して時分割でデー
タ伝送を行う場合、次の４種類がある。以下、そ
の概略と問題点を指摘する。(Prior art and its problems) When a plurality of main stations share a transmission line and perform data transmission in a time-division manner, there are the following four types. The outline and problems are pointed out below.
(1) 集中型伝送制御装置
各主局からの伝送要求信号を集中的に処理す
る伝送制御装置を設けたものである。伝送制御
装置は、伝送要求が競合した場合に、適当な主
局のみ伝送を許可する。(1) Centralized transmission control device This is equipped with a transmission control device that centrally processes transmission request signals from each main station. The transmission control device allows only an appropriate master station to transmit when transmission requests conflict.
問題点として、伝送制御装置が故障するとす
べての伝送が異常となる。そこで、例えば電源
系統などの、伝送制御装置に格別の信頼性が要
求されるため、二重化などの対策をとる必要が
あり、装置が複雑かつ高価となる。 The problem is that if the transmission control device fails, all transmissions become abnormal. Therefore, transmission control devices, such as power supply systems, are required to have exceptional reliability, so it is necessary to take measures such as duplication, which makes the device complicated and expensive.
(2) 分散型伝送制御装置。(2) Distributed transmission control equipment.
主局間で伝送制御権を一定のスケジユールで
持回りし、伝送制御権を得た主局が自局の伝送
制御機能を用いて伝送制御するものである。 The transmission control authority is rotated between master stations on a fixed schedule, and the master station that has acquired the transmission control authority controls the transmission using its own transmission control function.
この方式は危険分散形なので、個々の主局の
伝送制御機能の信頼性は(1)の場合ほど高い信頼
性を持つ必要がない。しかし、伝送制御権の持
回りのスケジユーリングに周到な配慮を必要と
する。 Since this method is a risk distribution type, the reliability of the transmission control function of each main station does not need to be as high as in case (1). However, careful consideration must be given to scheduling of transmission control rights.
(3) 伝送制御装置のないもの
特別の伝送制御装置を設けず、単にタイマを
各主局に備えたものである。即ち、各主局に優
先順位に応じた互いに異なつた待ち時間を設定
し、各伝送は伝送要求信号を出した後のこの待
ち時間経過後（タイムアツプ）に伝送線路の状
況を判断し、線路があいていれば伝送に入る。(3) Without a transmission control device A special transmission control device is not provided, and each main station is simply equipped with a timer. In other words, different waiting times are set for each main station depending on the priority order, and each transmission judges the status of the transmission line after the waiting time has elapsed (time-up) after issuing a transmission request signal, and then determines whether the line is If it is free, it will start transmitting.
このようにすれば、主局に対して伝送を許可
する伝送制御装置が不要となる利点がある。し
かし、各主局に設定した待ち時間がオーバーヘ
ツドタイムとなり、共通線路使用の時間的効率
が低下する。特に、優先順位にしたがつて待ち
時間を定めているので、低い優先順位の主局は
オーバーヘツドタイムが著しく長くなる欠点が
ある。 This has the advantage that a transmission control device that permits transmission to the main station is not required. However, the waiting time set for each main station becomes overhead time, reducing the time efficiency of using the common line. In particular, since the waiting time is determined according to the priority, the main station with a lower priority has a disadvantage that the overhead time becomes significantly longer.
(4) タイミング同期型
この方式は、例えば特開昭48−62311号公報
で公知のもので、特別の伝送制御装置を設けな
いで、共通のタイミング発生装置により各主局
の伝送要求信号のタイミングを同期させたもの
である。(4) Timing synchronization type This method is known, for example, in Japanese Patent Application Laid-open No. 48-62311, and uses a common timing generator to synchronize the timing of transmission request signals from each main station without installing a special transmission control device. are synchronized.
伝送制御装置を用いること無くタイミング発
生装置を共通化しただけなので、このタイミン
グ発生装置だけ格別の信頼性があればよい。し
かし、クロツクのタイミング信号は一定の間隔
で出力されるので、各主局は送信要求信号を出
力する場合タイミング信号との関係で１クロツ
ク分より少ない時間待機する必要が生じて、や
はりオーバーヘツドタイムが長くなる問題点が
ある。 Since the timing generation device is simply shared without using a transmission control device, it is only necessary that this timing generation device has exceptional reliability. However, since the clock timing signal is output at regular intervals, when each main station outputs the transmission request signal, it is necessary to wait for less than one clock period due to the timing signal, which also results in overhead time. There is a problem with the length of time.
（発明の目的）
本発明はこのような問題点を解決したもので、
集中的にも分散的にも伝送制御装置が不要で、且
つオーバーヘツドタイムが必要最小限ですむデー
タ伝送方式を提供することを目的とする。(Object of the invention) The present invention solves these problems,
It is an object of the present invention to provide a data transmission system that does not require a transmission control device either centrally or decentrally, and that requires minimal overhead time.
（問題点を解決するための手段）
このような目的を達成する本発明は、共通の伝
送線路にそれぞれＴ型接続された複数の主局と複
数の従局からなるデータ伝送装置に使用されるデ
ータ伝送方式に関する。(Means for Solving the Problems) The present invention, which achieves the above object, is a data transmission device used in a data transmission device consisting of a plurality of main stations and a plurality of slave stations, each connected in a T-shape to a common transmission line. Regarding transmission methods.
そして、このデータ伝送方式は、複数の主局に
は優先順位にしたがつて個々に周波数を違えた伝
送要求信号を割当て、各主局は伝送線路上の伝送
要求信号の有無を監視して伝送要求信号がないと
きに自局の伝送要求信号を送出し、所定時間経過
後に伝送線路上の伝送要求信号の有無を調べ、当
該伝送要求信号が存在している場合はさらにその
周波数を調べて、他に伝送要求信号のないとき若
しくは他に伝送要求信号が存在していてその中に
自局の伝送要求信号よりも優先順位の上位のもの
がないときはデータ伝送を開始し１つのトランザ
クシユン終了後に伝送要求信号の送出をとめ、自
局の伝送要求信号よりも優先順位の上位のものが
あるときはただちに伝送要求信号の送出をとめる
ようにしたものにおいて、次の構成としたもので
ある。 In this data transmission method, transmission request signals with different frequencies are assigned to multiple main stations according to their priorities, and each main station monitors the presence or absence of a transmission request signal on the transmission line and transmits the signal. When there is no request signal, it sends out its own transmission request signal, checks whether there is a transmission request signal on the transmission line after a predetermined period of time has passed, and if the transmission request signal is present, further checks its frequency, When there is no other transmission request signal, or when there is another transmission request signal and none of them has a higher priority than the transmission request signal of the local station, data transmission is started and one transaction ends. In this system, the transmission of the transmission request signal is stopped later, and the transmission of the transmission request signal is immediately stopped when there is a transmission request signal higher in priority than the transmission request signal of the own station, and has the following configuration.
即ち、自局の伝送要求信号の送出はランダムで
あると共に、前記所定時間を自局の伝送要求信号
送出時を起算時とし、伝送線路上最も隔たつた二
つの主局間の信号伝達時間の２倍を下回らない時
間経過後であることを特徴とするものである。 That is, the sending of the transmission request signal from the own station is random, and the predetermined time is calculated from the time when the own station sends the transmission request signal, and the signal transmission time between the two main stations that are the most distant on the transmission line. It is characterized in that the time has elapsed no less than twice as long.
（作用）
所定時間は、他の主局から伝送要求信号が送出
されて伝送要求が競合したものと認識できる最少
時間に設定されている。伝送要求が競合すると、
自局の優先順位が高いと判断すると送信を開始す
るが、優先順位が低いと送信要求を取下げる。他
の主局に対して送信要求の許可をすることはな
く、また送信要求信号の送出はランダムでよい。(Function) The predetermined time is set to the minimum time when a transmission request signal is sent from another main station and it is recognized that the transmission request is in conflict. When transmission requests conflict,
If it determines that its own priority is high, it will start transmitting, but if it determines that its priority is low, it will cancel the transmission request. Transmission requests are not permitted to other main stations, and transmission request signals may be sent randomly.
（実施例） 以下図面を用いて、本発明を説明する。(Example) The present invention will be explained below using the drawings.
第１図は本発明の使用されるデータ伝送装置の
構成ブロツク図である。第１図において、Ｍ１〜
Mmは主局で、伝送要求信号を出す資格のある局
である。Sm１〜Snは従局で、伝送要求信号を出
す資格のない局である。Ｌは伝送線路で、主局Ｍ
１〜Mm及び従局Sm１〜SnがＴ型接続されてい
る。各主局Miには優先順位に応じて周波数を
個々に異ならせた伝送要求信号が割当てられてお
り、一本の専用信号線を用いて伝送している。ま
た、主局Miと従局Sjの関係は、例えばデータ通
信系における通信ステーシヨンとその端末機とい
う関係でもよく、またマルチプロセシング・シス
テムにおけるプロセツサやDMA装置とメモリや
Ｉ／Ｏ装置の関係でもよい。 FIG. 1 is a block diagram of a data transmission device used in the present invention. In Figure 1, M1~
Mm is a master station, which is a station qualified to issue a transmission request signal. Sm1 to Sn are slave stations, which are not qualified to issue transmission request signals. L is the transmission line, and the main station M
1 to Mm and slave stations Sm1 to Sn are connected in a T-shape. Each main station Mi is assigned a transmission request signal with a different frequency depending on the priority, and is transmitted using a single dedicated signal line. Further, the relationship between the master station Mi and the slave station Sj may be, for example, a relationship between a communication station and its terminal in a data communication system, or a relationship between a processor, a DMA device, a memory, or an I/O device in a multiprocessing system.
以下、データ通信系を例に説明し、ここで伝送
線路Ｌは同軸ケーブルとする。また、要求の優先
順位は周波数が高いほど高位とする。 Hereinafter, a data communication system will be explained as an example, and the transmission line L is assumed to be a coaxial cable. Furthermore, the higher the frequency, the higher the priority of the request.
第２図は各種局Miの送受信部の構成ブロツク
図である。図中、１は伝送要求信号の送受信器、
２はデータの送受信器である。伝送線路Ｌもこれ
に対応して、伝送要求信号などを伝送する制御線
路と、データを伝送するデータ線路の２系統にな
つている。これら両送受信器において、１１は伝
送要求信号を制御線路の送出するドライバ、２１
はデータをデータ線路に送出するドライバ、１２
は他局からの伝送要求信号を傍受するレシーバ、
２２は他局からのデータを傍受するレシーバであ
る。１３はレシーバ１２の出力端に接続された分
波器１３で、伝送要求信号の周波数の弁別が行わ
れる。分波器１３の出力信号に基づいて、主局
Miの論理的機能により、自局と他局との優先順
位の上下関係が判断される。 FIG. 2 is a block diagram of the configuration of the transmitting/receiving sections of various stations Mi. In the figure, 1 is a transmitter/receiver for a transmission request signal;
2 is a data transmitter/receiver. Correspondingly, the transmission line L has two systems: a control line for transmitting a transmission request signal, etc., and a data line for transmitting data. In both of these transceivers, 11 is a driver for sending out a transmission request signal on a control line;
is a driver that sends data to the data line, 12
is a receiver that intercepts transmission request signals from other stations,
22 is a receiver that intercepts data from other stations. Reference numeral 13 denotes a duplexer 13 connected to the output end of the receiver 12, which discriminates the frequency of the transmission request signal. Based on the output signal of the duplexer 13, the main station
Mi's logical function determines the priority relationship between the own station and other stations.
このように構成された装置の動作を次に場合を
分けて説明する。 The operation of the apparatus configured in this manner will be explained below for each case.
(1) 伝送要求信号の送信
主局Miは伝送の必要が生じたとき、ランダ
ムに自局に割当てられた周波数iの伝送要求信
号をドライバ１１を通じて伝送線路Ｌに送出す
る。伝送要求信号は、一つの伝送トランザクシ
ユン（transaction）が終わるまで維持される。
伝送要求信号の送出は、制御線路に他の主局か
らの伝送要求信号が存在していないことを分波
器１３の出力により事前に調べ、空きであるこ
とを確認して行われる。伝送要求信号が希にし
か送出されない場合は競合の発生することは少
なく、そのため多くの場合そのままデータ転送
が認められる。尚、例外として複数の主局の伝
送要求が同時に発生した場合の競合処理は、次
の如くである。(1) Transmission of transmission request signal When the need for transmission arises, the main station Mi sends a transmission request signal of a frequency i randomly assigned to the main station to the transmission line L through the driver 11. The transmission request signal is maintained until one transmission transaction is completed.
The transmission request signal is sent by checking in advance that there is no transmission request signal from another main station on the control line using the output of the duplexer 13, and confirming that the control line is empty. If a transmission request signal is sent only rarely, contention is unlikely to occur, and therefore data transfer is allowed as is in most cases. Incidentally, as an exception, when transmission requests from a plurality of main stations occur at the same time, competition processing is as follows.
(2) 競合処理
任意の主局Miが、自局の分波器１３の出力
に基づいて他局の伝送要求信号の有無を調べ、
伝送線路Ｌが空きであれば周波数iの伝送要求
信号を送信したとする。(2) Competition processing An arbitrary main station Mi checks whether there is a transmission request signal from another station based on the output of the duplexer 13 of its own station, and
Assume that if the transmission line L is empty, a transmission request signal of frequency i is transmitted.
しかし、この伝送要求信号は他局に到達する
までには、伝送線路Ｌの伝送距離に応じた時間
がかかる。この時間内は、他局にとつてはどの
主局も伝送要求信号を出力していない場合と等
価である。そこで、他局はこの時間内に伝送要
求信号を送出可能である。言い替えると、主局
Miが伝送要求信号を送出してから、この信号
が他局に到達するまでの時間内に発生した他局
の伝送要求信号は、主局Miにとつて同時要求
と見なすことができる。 However, it takes time for this transmission request signal to reach another station, depending on the transmission distance of the transmission line L. For other stations, this period is equivalent to a case where none of the main stations outputs a transmission request signal. Therefore, other stations can send transmission request signals within this time. In other words, the main station
Transmission request signals from other stations that occur within the time period from when Mi sends out the transmission request signal to when this signal reaches another station can be regarded as simultaneous requests by the main station Mi.
この様な同時要求が他局において発生する
と、その伝送要求信号は、主局Miの伝送要求
信号と同じ所要時間で主局Miに伝達される。
即ち、主局Miは自局の伝送要求信号を送出し
たとき、少なくとも他局までの信号到達時間の
２倍の時間だけ待たなければ、他局の同時要求
の有無を確認できない。 When such a simultaneous request occurs at another station, the transmission request signal is transmitted to the main station Mi in the same time required as the transmission request signal of the main station Mi.
That is, when the main station Mi sends its own transmission request signal, it cannot confirm whether there is a simultaneous request from another station unless it waits at least twice the time it takes for the signal to reach the other station.
そこで、主局Miは伝送要求信号送出後、他
局までの信号到達時間の２倍の時間経つてから
分波器１３の出力信号を調べ、他局による伝送
要求信号の競合の有無を認識する。信号伝達時
間としては、主局Ｍ１〜Mmのうち最も離れた
もの同志の間の到達時間を選び、同時要求と見
なせるすべての他の主局の伝送要求信号が出揃
つた時点で競合の確認ができるようにし、この
時間を競合処理受付け時間という。 Therefore, after transmitting the transmission request signal, the main station Mi checks the output signal of the duplexer 13 after a time twice as long as the signal arrival time to other stations, and recognizes whether there is a competition for the transmission request signal from another station. . As the signal transmission time, select the arrival time between the most distant master stations M1 to Mm, and confirm the conflict when the transmission request signals from all other master stations that can be considered as simultaneous requests are received. This time is called the conflict processing acceptance time.
主局Miは、分波器１３の出力がいずれも自
局の伝送要求信号の周波数iを上回らない周波
数を示すときは、自局の優先順位が最高である
として伝送要求信号を持続したままデータの伝
送を開始する。他方、分波器１３の出力中に自
局の伝送要求信号の周波数iを上回る周波数を
示すものがあるときは、他局の優先順位が上で
あるとして伝送要求信号の送出を止めて待機す
る。 When the output of the duplexer 13 indicates a frequency that does not exceed the frequency i of the transmission request signal of the main station Mi, the main station Mi assumes that the priority of the own station is the highest and continues transmitting the transmission request signal and transmits the data. transmission begins. On the other hand, if there is a frequency in the output of the duplexer 13 that exceeds the frequency i of the transmission request signal of the own station, it is assumed that another station has a higher priority, and the transmission of the transmission request signal is stopped and the station waits. .
同様な動作が同時要求を発した他の主局にお
いても行われ、結局そのときの優先順位が最高
の主局がデータ伝送を開始する。 Similar operations are performed in other master stations that have issued simultaneous requests, and eventually the master station with the highest priority at that time starts data transmission.
データ伝送を開始した主局は、一つの伝送ト
ランザクシユンが終わつたときに伝送要求信号
の送出をとめる。すると、伝送要求信号がかな
えられず待機していた他の主局は、伝送線路Ｌ
が空いたことを検知してふたたび伝送要求信号
を発する。以下同様にして、複数の主局間の伝
送要求信号の競合が処理される。 The main station that started data transmission stops sending the transmission request signal when one transmission transaction is completed. Then, the other main stations that were waiting because the transmission request signal could not be fulfilled will switch to the transmission line L.
It detects that it is empty and issues a transmission request signal again. Thereafter, conflicts in transmission request signals between a plurality of main stations are handled in the same manner.
（発明の効果）
以上説明したように本発明によれば次の効果が
ある。(Effects of the Invention) As explained above, the present invention has the following effects.
(1) 競合処理を行う場合、各主局は競合処理受付
け時間経過後、優先順位の如何に関わらず一律
の時間で確定し、従来例(3)で示すような競合処
理の確定時間が各局の待ち時間で相違するとい
う事態がない。(1) When performing contention processing, each main station determines the contention process in a uniform time after the contention processing reception time has passed, regardless of the priority, and each station has a fixed time for contention processing as shown in conventional example (3). There is no difference in waiting time.
(2) 競合処理受付け時間は信号伝達上必要最小限
の時間なので、必要最小限のオーバーヘツドタ
イムで、伝送要求信号の競合処理ができる。(2) Since the contention processing acceptance time is the minimum time required for signal transmission, contention processing of transmission request signals can be performed with the minimum necessary overhead time.
(3) 各主局にランダムな伝送要求信号の発生を許
容しているので、従来例(4)のようなタイミング
信号の到達を待つ必要がない。(3) Since each main station is allowed to generate random transmission request signals, there is no need to wait for the timing signal to arrive as in the conventional example (4).
(4) 各主局は自局のデータ伝送のみを管理し、他
の主局にデータ伝送を許可することがないの
で、集中的にも分散的にも伝送制御装置がな
く、簡単な構成である。(4) Since each master station only manages its own data transmission and does not permit data transmission to other master stations, there is no transmission control device either centrally or decentrally, and the configuration is simple. be.
第１図は本発明の使用されるデータ伝送装置の
構成ブロツク図、第２図は各種局Miの送受信部
の構成ブロツク図である。
Ｍ１〜Mm…主局、Sm１〜Sn…従局、Ｌ…伝
送線路、１…伝送要求信号送受信器、２…データ
送受信器。
FIG. 1 is a block diagram of the configuration of a data transmission apparatus used in the present invention, and FIG. 2 is a block diagram of the configuration of transmitting and receiving units of various stations Mi. M1 to Mm...Main station, Sm1 to Sn...Slave station, L...Transmission line, 1...Transmission request signal transmitter/receiver, 2...Data transmitter/receiver.
Claims (1)
数の主局と複数の従局からなるデータ伝送装置に
使用されるものであつて、 複数の主局には優先順位にしたがつて個々に周
波数を違えた伝送要求信号を割当て、各主局は伝
送線路上の伝送要求信号の有無を監視して伝送要
求信号がないときに自局の伝送要求信号を送出
し、所定時間経過後に伝送線路上の伝送要求信号
の有無を調べ、当該伝送要求信号が存在している
場合はさらにその周波数を調べて、他に伝送要求
信号のないとき若しくは他に伝送要求信号が存在
していてその中に自局の伝送要求信号よりも優先
順位の上位のものがないときはデータ伝送を開始
し１つのトランザクシユン終了後に伝送要求信号
の送出をとめ、自局の伝送要求信号よりも優先順
位の上位のものがあるときはただちに伝送要求信
号の送出をとめるようにしたデータ伝送方式にお
いて、 自局の伝送要求信号の送出はランダムであると
共に、 前記所定時間は自局の伝送要求信号送出時を起
算時とし、伝送線路上最も隔たつた二つの主局間
の信号伝達時間の２倍を下回らない時間経過後で
あることを特徴とするデータ伝送制御方式。[Claims] 1. Used in a data transmission device consisting of a plurality of master stations and a plurality of slave stations, each connected in a T-shape to a common transmission line, wherein the plurality of master stations are arranged in order of priority. Therefore, transmission request signals with different frequencies are assigned to each main station, and each main station monitors the presence or absence of a transmission request signal on the transmission line, and when there is no transmission request signal, transmits its own transmission request signal and waits for a predetermined period of time. After the elapsed time, the presence or absence of a transmission request signal on the transmission line is checked, and if the transmission request signal is present, its frequency is further checked. If there is no one with a higher priority than the own station's transmission request signal, data transmission is started, and transmission of the transmission request signal is stopped after one transaction is completed, giving priority to the own station's transmission request signal. In a data transmission method in which transmission of transmission request signals is immediately stopped when there is a higher ranked one, the transmission of the transmission request signal of the own station is random, and the transmission of the transmission request signal of the own station is performed at the predetermined time. A data transmission control system characterized in that the calculation is performed after a time not less than twice the signal transmission time between the two main stations furthest apart on the transmission line, starting from the current time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11011480A JPS5735445A (en) | 1980-08-11 | 1980-08-11 | Data transmission controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11011480A JPS5735445A (en) | 1980-08-11 | 1980-08-11 | Data transmission controlling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5735445A JPS5735445A (en) | 1982-02-26 |
| JPS636186B2 true JPS636186B2 (en) | 1988-02-08 |
Family
ID=14527390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11011480A Granted JPS5735445A (en) | 1980-08-11 | 1980-08-11 | Data transmission controlling system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5735445A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59234A (en) * | 1982-06-25 | 1984-01-05 | Mitsubishi Electric Corp | Signal monitoring controlling system |
| JPS59202753A (en) * | 1983-05-02 | 1984-11-16 | Toshiba Corp | Data communication system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4862311A (en) * | 1971-11-08 | 1973-08-31 |
-
1980
- 1980-08-11 JP JP11011480A patent/JPS5735445A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4862311A (en) * | 1971-11-08 | 1973-08-31 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5735445A (en) | 1982-02-26 |
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