JPH0432333A - Data transmission system - Google Patents
Data transmission systemInfo
- Publication number
- JPH0432333A JPH0432333A JP2139010A JP13901090A JPH0432333A JP H0432333 A JPH0432333 A JP H0432333A JP 2139010 A JP2139010 A JP 2139010A JP 13901090 A JP13901090 A JP 13901090A JP H0432333 A JPH0432333 A JP H0432333A
- Authority
- JP
- Japan
- Prior art keywords
- data
- data transmission
- transmission
- priority
- circuit
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 83
- 238000010586 diagram Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、複数局間のデータ伝送を行う場合に、デー
タのぶつかりを起こす確率を小さくするためのデータ伝
送システムに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission system for reducing the probability of data collision occurring when data is transmitted between multiple stations.
［従来の技術］
第４図は、従来のこの種のデータ伝送システムを実現し
ている各データ伝送装置のブロック構成図であり、図に
おいて、１−はデータ入出力装置、２はデータ入出力装
置１が接続されるデータ制御装置、３はデータ制御装置
２に接続され、アンテナ３ａが接続される無線機である
。また、４はデータ制御装置２より出力されるデータ送
出要求と無線機３より出力されるデータ送出許可信号の
アンド条件を取るアンド回路、６はアンド回路４より出
力されるデータ送出制御信号をランダムな時間分だけ遅
らせてデータ制御装置２及び無線機３に出力するランダ
ム時間遅延回路である。[Prior Art] FIG. 4 is a block diagram of each data transmission device that realizes this kind of conventional data transmission system. In the figure, 1- is a data input/output device, and 2 is a data input/output device. A data control device 3 is connected to the data control device 2, and a radio device 3 is connected to the antenna 3a. Further, 4 is an AND circuit that takes an AND condition between the data transmission request output from the data control device 2 and the data transmission permission signal output from the radio device 3, and 6 is a random output control signal for the data transmission control signal output from the AND circuit 4. This is a random time delay circuit that outputs the data to the data control device 2 and the radio device 3 with a delay of a certain amount of time.
次に動作について説明する。Next, the operation will be explained.
データ入出力装置１より伝送するデータが入力され、デ
ータ制御袋ｗ２で入力データを加工し、無線機３を通し
てデータをアンテナ３ａより相手局へ伝送する。この場
合、他局同士がデータ伝送を実施していると、それに対
して妨害を与える。Data to be transmitted is input from the data input/output device 1, processed by the data control bag w2, and transmitted through the radio 3 to the other station via the antenna 3a. In this case, if other stations are transmitting data to each other, this will be interfered with.
そのためデータを送出する場合は、無線機３よりの全他
局が通信してなく送出音である旨の信号とデータ制御装
置２からのデータ送出要求とのアンド条件をアンド回路
４で取り、その信号出力でデータ制御装置２及び無線機
３を制御してデータ送出を開始する。この時、データ送
出要求が出ているデータ伝送装置が複数ある場合は、無
線機３より送出可の信号が出ると同時にそれぞれがデー
タ伝送を開始することになり、データがぶつかってデー
タ伝送ができなくなる。この対策として、アンド回路４
の出力にランダム時間遅延回路６を挿入し、各伝送装置
の送出開始時間をランダムにずらすことにより、データ
のぶつかりを防止している。Therefore, when transmitting data, the AND circuit 4 performs an AND condition between the signal from the radio 3 indicating that all other stations are not communicating and the sound is being transmitted, and the data transmission request from the data control device 2. The data control device 2 and the radio device 3 are controlled by the signal output to start data transmission. At this time, if there are multiple data transmission devices requesting data transmission, each device will start transmitting data at the same time as the radio device 3 outputs a signal indicating that transmission is possible, and the data will collide and data transmission will not be possible. It disappears. As a countermeasure for this, AND circuit 4
By inserting a random time delay circuit 6 into the output of the transmitter and randomly shifting the transmission start time of each transmission device, data collision is prevented.
［発明が解決しようとする課題］
従来のデータ伝送システムは以上のように、各データ伝
送装置のランダム時間遅延回路のみでデータのぶつかり
防止対策をしているため、ぶつかりの確率を小さくする
には最大遅延時間を十分に長くする必要があり、そのた
め長い遅延時間が設定された場合は長く待たなければな
らない。また、遅延時間がランダムなため、各データ伝
送装置の伝送優先順位付けができないなどの問題点があ
った。[Problems to be Solved by the Invention] As described above, conventional data transmission systems take measures to prevent data collisions using only the random time delay circuit of each data transmission device, so there are several ways to reduce the probability of collisions. The maximum delay time needs to be long enough, so if a long delay time is set, you will have to wait a long time. Furthermore, since the delay times are random, there are problems in that it is not possible to prioritize the transmission of each data transmission device.
この発明は上記のような問題点を解消するためになされ
たもので、各データ伝送装置の伝送優先順位を付け、伝
送効率を良くすることを目的とする。This invention was made to solve the above-mentioned problems, and aims to improve transmission efficiency by assigning transmission priorities to each data transmission device.
［課題を解決するための手段］
この発明に係るデータ伝送システムは、各データ伝送装
置の伝送優先順位に応じて、すなわち優先順位順に段々
長くなるように設定された遅延時間だけデータ送出の開
始を遅延させる遅延手段を備えたものである。[Means for Solving the Problems] The data transmission system according to the present invention starts data transmission for a delay time that is set to become gradually longer in the order of priority, that is, according to the transmission priority of each data transmission device. It is equipped with a delay means for delaying the time.
［作用］
この発明における遅延手段は、各データ伝送装置のデー
タ送出優先順似顔に段々長く遅延時間が設定され、各デ
ータ伝送装置のデータ送出開始時間が優先順位順に決定
される。[Operation] In the delay means of the present invention, the delay time is set to be gradually longer in accordance with the data transmission priority order of each data transmission device, and the data transmission start time of each data transmission device is determined in order of priority.
［実施例コ 以下、この発明の一実施例を図について説明する。[Example code] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１はデータ入出力装置、２はデータ入
出力装置１が接続されるデータ制御装置、３はデータ制
御装置２に接続され、アンテナ３ａが接続される無線機
である。また、４はデータ制御装置２より出力されるデ
ータ送出要求と無線機３より出力されるデータ送出許可
信号のアンド条件を取るアンド回路、５はアンド回路４
より出力されるデータ送出制御信号を各データ伝送装置
の優先順位に対応して設定された遅延時間分だけ遅らせ
てデータ制御装置２及び無線機３に出力する遅延回路で
ある。In FIG. 1, 1 is a data input/output device, 2 is a data control device to which the data input/output device 1 is connected, and 3 is a radio device connected to the data control device 2 and to which an antenna 3a is connected. Further, 4 is an AND circuit that takes an AND condition between the data transmission request outputted from the data control device 2 and the data transmission permission signal outputted from the radio device 3, and 5 is an AND circuit 4.
This is a delay circuit that delays the data transmission control signal outputted from the data transmission control signal by a delay time set corresponding to the priority of each data transmission device and outputs the delayed data to the data control device 2 and the radio device 3.
次に動作について説明する。Next, the operation will be explained.
従来同様、データ入出力装置１より伝送するデータが入
力さお、データ制御装置２で入力データを加工し、無線
機３を通してデータをアンテナ３ａより相手局へ伝送す
る。この場合、他局同士がデータ伝送を実施していると
、それに対して妨害を与える。そのためデータを送出す
る場合は、無線機３よりの今他局が通信してなく送出可
である旨の信号とデータ制御装置２からのデータ送出要
求とのアンド条件をアンド回路４で取り、その信号出力
を、各データ伝送装置の伝送優先順位に応じて遅延時間
が設定された遅延回路５を通すことにより、それぞれが
決められたデータ伝送開始時間にデータ送出を開始する
。なお、当然のことながら、データ送出要求のないもの
は送出しない。また、送出開始前に他の装置が開始した
場合は、無線機３でそれを検出し送出不可信号が出され
るため、データの送出を中止する。このようにして、伝
送優先順位が高く、かつデータを送出する必要のあるデ
ータ伝送装置からデータ伝送を開始することができる。As in the prior art, data to be transmitted from a data input/output device 1 is input, the input data is processed by a data control device 2, and the data is transmitted through a radio device 3 to a partner station from an antenna 3a. In this case, if other stations are transmitting data to each other, this will be interfered with. Therefore, when transmitting data, the AND circuit 4 performs an AND condition between the signal from the radio 3 indicating that no other station is currently communicating and transmission is possible, and the data transmission request from the data control device 2. By passing the signal output through a delay circuit 5 whose delay time is set according to the transmission priority of each data transmission device, each data transmission device starts transmitting data at the determined data transmission start time. Note that, as a matter of course, data without a data transmission request will not be transmitted. Furthermore, if another device starts before the start of data transmission, the wireless device 3 detects this and issues a transmission prohibition signal, so that data transmission is stopped. In this way, data transmission can be started from a data transmission device that has a high transmission priority and needs to send data.
また、伝送優先順位で遅延時間を決めるため、最大遅延
時間は必要最小限でよい。Furthermore, since the delay time is determined based on the transmission priority, the maximum delay time may be the minimum necessary.
なお、上記実施例では、伝送優先順位に応じて遅延時間
が設定された遅延回路５のみを設けたものを示したが、
ある−室以上優先順位の付けら九ない場合、すなわち同
じ優先順位の装置が複数となる場合は、第２図に示すよ
うに、遅延回路５の後にランダム時間遅延回路６を設け
ても良い。Note that in the above embodiment, only the delay circuit 5 whose delay time is set according to the transmission priority is provided; however,
If a certain room or more is not prioritized, that is, if a plurality of devices have the same priority, a random time delay circuit 6 may be provided after the delay circuit 5, as shown in FIG.
また、アンド回路４の代わりに、第３図に示すように、
データ制御装置２からのデータ送出要求信号が来たとき
無線機３より既に送出可信号が来ている場合はデータ送
出制御信号を遅延回路５゜６を通さずに直ぐに出し、送
出要求信号が送出可信号が出る前に出ている場合は、送
出可信号がでると同時にデータ送出制御信号を遅延回路
５，６を通して出力する制御回路７を設けても良い。Also, instead of the AND circuit 4, as shown in FIG.
When a data transmission request signal is received from the data control device 2, if a transmission ready signal has already been received from the radio 3, the data transmission control signal is immediately output without passing through the delay circuit 5゜6, and the transmission request signal is transmitted. If the send enable signal is issued before the send enable signal is issued, a control circuit 7 may be provided that outputs the data send control signal through the delay circuits 5 and 6 at the same time as the send enable signal is issued.
ところで、、ｈ記各実施例では、遅延回路５及び６やア
ンド回路４．制御回路７をハードウェアで説明したが、
ＣＰＵで同様の制御を行っても良い。By the way, in each embodiment described in h, the delay circuits 5 and 6 and the AND circuit 4. Although the control circuit 7 was explained in terms of hardware,
Similar control may be performed by the CPU.
また、無線機３は、有線のモデム装置などでも同様の効
果を奏する。Further, the radio device 3 can have the same effect with a wired modem device or the like.
［発明の効果コ
以北のように、この発明によれば、各データ伝送装置の
優先順位に応じてデータ送出の開始を遅延するように構
成したので、データ伝送装置間のデータのぶつかり合い
を効果的に防止でき、かつ優先順位の高い伝送装置から
先にデータ伝送でき、伝送効率が良くなる効果がある。[Effects of the Invention] As described above, according to the present invention, the start of data transmission is delayed according to the priority of each data transmission device, so data collision between data transmission devices can be prevented. This can be effectively prevented, data can be transmitted from the transmission device with a higher priority first, and the transmission efficiency can be improved.
第１図はこの発明の一実施例によるデータ伝送システム
における各データ伝送装置を示すブロック構成図、第２
図及び第３図はこの発明の他の実施例を示すブロック構
成図、第４図は従来のデータ伝送装置を示すブロック構
成図である。
１はデータ入出力装置、２はデータ制御装置、３は無線
機、４はアンド回路、５は遅延回路（遅延手段）、６は
ラング１１時間遅延回路、７は制御回路。
なお、図中、同一符号は同一、又は相当部分を示す。
代理人 弁理士 宮 園 純
図
ａ
４、アンド回路
５：遅延回路
う′Ｊダム時間遅延回路FIG. 1 is a block diagram showing each data transmission device in a data transmission system according to an embodiment of the present invention, and FIG.
3 and 3 are block diagrams showing other embodiments of the present invention, and FIG. 4 is a block diagram showing a conventional data transmission device. 1 is a data input/output device, 2 is a data control device, 3 is a radio, 4 is an AND circuit, 5 is a delay circuit (delay means), 6 is a rung 11 time delay circuit, and 7 is a control circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Patent Attorney Junzu Miyazono A 4, AND circuit 5: Delay circuit U'J dumb time delay circuit
Claims (1)
データ送出要求があり、かつ他局同士がデータ伝送を実
施していないときにデータ送出を行うようにしたデータ
伝送システムにおいて、各データ伝送装置の伝送優先順
位に応じて設定された遅延時間だけデータ送出の開始を
遅延させる遅延手段を備えたことを特徴とするデータ伝
送システム。Consisting of multiple data transmission devices, each data transmission device is
In a data transmission system in which data transmission is performed when there is a data transmission request and other stations are not transmitting data, data is transmitted for a delay time set according to the transmission priority of each data transmission device. A data transmission system comprising a delay means for delaying the start of transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139010A JPH0771084B2 (en) | 1990-05-29 | 1990-05-29 | Data transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139010A JPH0771084B2 (en) | 1990-05-29 | 1990-05-29 | Data transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0432333A true JPH0432333A (en) | 1992-02-04 |
| JPH0771084B2 JPH0771084B2 (en) | 1995-07-31 |
Family
ID=15235373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2139010A Expired - Fee Related JPH0771084B2 (en) | 1990-05-29 | 1990-05-29 | Data transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0771084B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841983A (en) * | 1995-01-18 | 1998-11-24 | Nippondenso Co., Ltd. | Communication system for transmitting divisional messages back-to-back by pre-setting blank duration between the divisonal messages prior to transmission |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60132440A (en) * | 1983-12-21 | 1985-07-15 | Toshiba Corp | Data transmission system |
-
1990
- 1990-05-29 JP JP2139010A patent/JPH0771084B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60132440A (en) * | 1983-12-21 | 1985-07-15 | Toshiba Corp | Data transmission system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841983A (en) * | 1995-01-18 | 1998-11-24 | Nippondenso Co., Ltd. | Communication system for transmitting divisional messages back-to-back by pre-setting blank duration between the divisonal messages prior to transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0771084B2 (en) | 1995-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |