JPH0865299A - Controlling method for transmission right - Google Patents
Controlling method for transmission rightInfo
- Publication number
- JPH0865299A JPH0865299A JP6201868A JP20186894A JPH0865299A JP H0865299 A JPH0865299 A JP H0865299A JP 6201868 A JP6201868 A JP 6201868A JP 20186894 A JP20186894 A JP 20186894A JP H0865299 A JPH0865299 A JP H0865299A
- Authority
- JP
- Japan
- Prior art keywords
- transmission right
- transmission
- signal
- slave
- slave devices
- 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.)
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- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、データ伝送システムに
関し、特に同一の通信回線を複数の通信装置で共有し、
複数の通信装置がランダムに信号を送信するときの送信
権制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system, and more particularly, to the same communication line shared by a plurality of communication devices.
The present invention relates to a transmission right control method when a plurality of communication devices randomly transmit signals.
【０００２】[0002]
【従来の技術】従来、この種のデータ伝送システムで
は、信号を送信した時、通信回線上で他の装置の送信信
号との衝突を防止するため、１つの装置のみに送信権を
与え、その他の装置が送信することを禁止しており、送
信権の管理方法として、以下の公知例がある。2. Description of the Related Art Conventionally, in this type of data transmission system, when a signal is transmitted, only one device is given a transmission right in order to prevent a collision with a transmission signal of another device on a communication line. The device is prohibited from transmitting, and as a method of managing the transmission right, there are the following known examples.
【０００３】第１の公知例として、「特開平３−２８３
８２９号公報」には、送信権の要求，解放および変更に
関する信号（以下、送信権制御信号と呼ぶ）の通信にデ
ータ通信とは別の専用の回線を使用し、送信権の制御を
行う制御局は、送信権を要求および解放する加入者局と
の間の送信権制御信号の送受信を１対１の通信で行って
いる。As a first known example, "Japanese Patent Laid-Open No. 3-283"
No. 829 publication ”, a control for controlling a transmission right by using a dedicated line different from data communication for communication of a signal relating to request, release and change of the transmission right (hereinafter, referred to as a transmission right control signal). The station transmits and receives the transmission right control signal to and from the subscriber station that requests and releases the transmission right by one-to-one communication.
【０００４】第２の公知例として、「特開平３−１３６
４２６公報」には、送信権の要求をキャリア信号で行
い、複数の装置が同時に送信権要求信号を送信した場
合、送信した順番とは逆の順番に送信権を与えている。As a second known example, "Japanese Patent Laid-Open No. 3-136"
"426 publication", a transmission right is requested by a carrier signal, and when a plurality of devices simultaneously transmit a transmission right request signal, the transmission right is given in the reverse order of the transmission order.
【０００５】第３の公知例として、「特開昭６０−２５
４９４３公報」には、いずれの装置からも送信要求が発
生していない場合でも、どれか１つの装置に送信権を与
えておき、送信権を必要とする装置は、全装置に対して
送信権要求信号を同報送信し、送信権を持っている装置
がそれを受信して、送信権の委譲を同報送信する。そし
て、送信権が移った場合、送信権を持たない装置は一定
時間、送信権要求信号の送信を停止している。As a third known example, "Japanese Patent Laid-Open No. 60-25"
4943 gazette, even if no transmission request is issued from any of the devices, one of the devices is given a transmission right, and the device requiring the transmission right transmits the transmission right to all the devices. The request signal is broadcast, and the device having the transmission right receives it, and broadcasts the transfer of the transmission right. When the transmission right is transferred, the device that does not have the transmission right suspends the transmission of the transmission right request signal for a certain period of time.
【０００６】[0006]
【発明が解決しようとする課題】第１の公知例の場合、
送信権制御信号のために、専用の回線を必要とする上
に、制御局と加入者局との間を１対１の通信で行ってい
るため、制御局は、１回の送信権要求に対して加入者局
数分の信号を送受信しなければならず、加入者局が増え
ると、制御局の負荷および送信権制御信号用の回線のト
ラフィックが増加することを免れない。In the case of the first known example,
Since a dedicated line is required for the transmission right control signal and the control station and the subscriber station are in one-to-one communication, the control station requests the transmission right once. On the other hand, signals corresponding to the number of subscriber stations must be transmitted and received, and when the number of subscriber stations increases, the load on the control station and the traffic on the line for the transmission right control signal are inevitably increased.
【０００７】また、第２の公知例の場合、最初に送信権
を要求した装置が最後に送信権を与えられるという問題
がある。Further, in the case of the second known example, there is a problem that the device which first requests the transmission right is given the transmission right at the end.
【０００８】また、第３の公知例の場合、送信している
かいないかに関係なく、送信権が与えられており、送信
権を持っていない装置では、実際に送信が行われている
かどうかがわからず、送信中でも送信権要求信号が他の
装置から送信され、衝突が発生する可能性がある。ま
た、他の装置に送信権が渡った場合、一定時間、送信権
要求信号の送信を禁止しているが、一定時間経過しても
まだ、送信中の場合は衝突が発生し、一定時間経過前に
送信が終了している場合は、その一定時間が経過するま
で、回線が空いてしまい無駄になり、また、送信権の要
求を同報で行っているため、回線のトラフィックが大き
いという問題がある。Further, in the case of the third known example, the transmission right is given regardless of whether the transmission is performed or not, and the device which does not have the transmission right knows whether or not the transmission is actually performed. However, the transmission right request signal may be transmitted from another device even during transmission, and a collision may occur. In addition, when the transmission right is passed to another device, the transmission of the transmission right request signal is prohibited for a certain period of time. If the transmission has been completed before, the line will be wasted until the fixed time elapses, and the request for the transmission right will be sent in a broadcast manner, resulting in heavy line traffic. There is.
【０００９】[0009]
【課題を解決するための手段】上述した問題点を解決す
るため、本発明による送信権制御方法は、送信権の制御
を行うマスタ装置は上り回線が空き状態のときには、全
スレーブ装置に送信権要求信号のみの送信を許可する信
号を同報送信し、いずれか１つのスレーブ装置から送信
権要求信号を受信したときには、そのスレーブ装置が送
信権を解放するまでの間、すべての信号の送信権を与え
る信号を全スレーブ装置に同報送信して送信権要求信号
を送信したスレーブ装置には送信権が与えられたことを
知らせ、その他のスレーブ装置には他のスレーブ装置に
送信権が渡り、送信権要求信号を含むすべての信号の送
信が禁止されたことを知らせることにより、複数のスレ
ーブ装置が同時に上り信号を送信し、衝突が発生するこ
とを防止する。In order to solve the above problems, in the transmission right control method according to the present invention, the master device for controlling the transmission right transmits the transmission right to all slave devices when the uplink is idle. When a signal permitting the transmission of only a request signal is broadcast, and a transmission right request signal is received from any one slave device, the transmission right of all signals until the slave device releases the transmission right. The slave device that has transmitted the transmission right request signal by broadcasting a signal that gives the transmission right request signal to the slave device is notified that the transmission right has been given, and the other slave devices are given the transmission right to the other slave devices. By notifying that transmission of all signals including the transmission right request signal is prohibited, it is possible to prevent a plurality of slave devices from transmitting uplink signals at the same time and causing a collision.
【００１０】[0010]
【実施例】次に本発明について図面を参照して説明す
る。本実施例では、マスタ装置からスレーブ装置の方向
の信号を「下り」、スレーブ装置からマスタ装置の方向
の信号を「上り」と呼ぶ。The present invention will be described below with reference to the drawings. In this embodiment, a signal in the direction from the master device to the slave device is called “down”, and a signal in the direction from the slave device to the master device is called “up”.
【００１１】図１は、本発明の一実施例におけるデータ
伝送システムの通信装置のブロック図である。図１を参
照すると、マスタ装置０は、データを送信する送信部Ｔ
０と、データを受信する受信部Ｒ０と、送信部Ｔ０およ
び受信部Ｒ０を制御する通信制御部ＣＣ０と、通信制御
部ＣＣ０の上位レイヤ処理を行う制御部Ｃ０とから構成
される。スレーブ装置１，２…ｎはすべて同様の構成で
あり、構成要素はマスタ装置０と同様である。マスタ装
置０の送信部Ｔ０は、スレーブ装置１，２…ｎの受信部
Ｒ１，２…ｎとまた、受信部Ｒ０は送信部Ｔ１，２…ｎ
と並列接続されている。FIG. 1 is a block diagram of a communication device of a data transmission system according to an embodiment of the present invention. Referring to FIG. 1, a master device 0 includes a transmitting unit T for transmitting data.
0, a reception unit R0 that receives data, a communication control unit CC0 that controls the transmission unit T0 and the reception unit R0, and a control unit C0 that performs upper layer processing of the communication control unit CC0. The slave devices 1, 2, ... N all have the same configuration, and the constituent elements are the same as those of the master device 0. The transmitting unit T0 of the master device 0 is the same as the receiving units R1,..., N of the slave devices 1, 2,.
It is connected in parallel with.
【００１２】図２は、マスタ装置０の状態遷移例であ
る。図２において、送信権空き状態とは、送信権をどの
スレーブ装置にも与えていない状態で、全スレーブ装置
から送信権要求信号のみを受け付ける。送信権許可中状
態とは、１つのスレーブ装置に送信権を与えている状態
である。FIG. 2 is a state transition example of the master device 0. In FIG. 2, the transmission right empty state is a state in which the transmission right is not given to any slave device, and only the transmission right request signal is received from all the slave devices. The transmission right permitting state is a state in which the transmission right is given to one slave device.
【００１３】図３はスレーブ装置１，２…ｎの状態遷移
例である。図３において、送信権空き状態とは、送信権
がどのスレーブ装置にも与えられていない状態で、スレ
ーブ装置から送信権要求信号のみが送信可能である。送
信権使用中状態とは、自スレーブ装置に送信権が与えら
れており、すべての信号の送信が可能な状態である。送
信権他装置使用中状態とは、他のスレーブ装置に送信権
が与えられている状態で、自スレーブ装置はすべての信
号の送信が禁止されている状態である。FIG. 3 is a state transition example of the slave devices 1, ... In FIG. 3, the transmission right empty state means that the transmission right is not given to any slave device, and only the transmission right request signal can be transmitted from the slave device. The transmission right in use state is a state in which the transmission right is given to the slave device itself and all signals can be transmitted. The transmission right other device in use state is a state in which the transmission right is given to another slave device, and is a state in which transmission of all signals is prohibited in the own slave device.
【００１４】図４は、図５から図９に示すＳＤＬ図の凡
例である。図５はマスタ装置０の送信制御部ＣＣ０の送
信権空き状態における動作を表すＳＤＬ図である。図６
はマスタ装置０の送信制御部ＣＣ０の送信権許可中状態
における動作を表すＳＤＬ図である。図７はスレーブ装
置１，２…ｎの送信制御部ＣＣ１，２…ｎの送信権空き
状態における動作を表すＳＤＬ図である。図８はスレー
ブ装置１，２…ｎの送信制御部ＣＣ１，２…ｎの送信権
他装置使用中状態における動作を表すＳＤＬ図である。
図９はスレーブ装置１，２…ｎの送信制御部ＣＣ１，２
…ｎの送信権使用中状態における動作を表すＳＤＬ図で
ある。図１０は、マスタ装置０とスレーブ装置１，２…
ｎとの間のデータ伝送のシーケンスの一例を示すシーケ
ンス図である。FIG. 4 is a legend of the SDL diagrams shown in FIGS. 5 to 9. FIG. 5 is an SDL diagram showing the operation of the transmission control unit CC0 of the master device 0 in the transmission right idle state. Figure 6
FIG. 6 is an SDL diagram showing an operation of the transmission control unit CC0 of the master device 0 in a transmission right permitting state. FIG. 7 is an SDL diagram showing the operation of the transmission control units CC1, CC2, ... FIG. 8 is an SDL diagram showing the operation of the transmission control units CC1, CC2, ...
9 shows transmission control units CC1, CC2 of the slave devices 1, ...
It is a SDL diagram showing the operation | movement in the state using the transmission right of ... n. FIG. 10 shows a master device 0, slave devices 1, 2, ...
It is a sequence diagram which shows an example of the sequence of the data transmission between n.
【００１５】次に、図１，図５，図６，図７，図８，図
９および図１０を参照して、送信権制御について説明す
る。マスタ装置０は、装置が起動すると、初期化処理で
送信権許可（全装置）信号を全スレーブ装置１，２…ｎ
に同報送信し、タイマＴを起動し、状態を「送信権空
き」にする（Ｓ５１２→Ｓ５１３→Ｓ５１４と同様処
理、Ｓ１００１）。送信権許可（全装置）信号を受信し
たスレーブ装置１，２…ｎは、状態を「送信権空き」に
する（Ｓ７０１→Ｓ７０２，Ｓ８０１→Ｓ８０２および
Ｓ９２１→Ｓ９２２）。マスタ装置０はタイマＴがタイ
ムアウトすると送信権許可（全装置）信号を全スレーブ
装置１，２…ｎに同報送信し、タイマＴを再起動し、状
態を「送信権空き」にする（Ｓ５１１→Ｓ５１２→Ｓ５
１３→Ｓ５１４、Ｓ１００２）。Next, the transmission right control will be described with reference to FIGS. 1, 5, 6, 7, 8, 9 and 10. When the master device 0 is activated, the master device 0 sends a transmission right permission (all devices) signal to all slave devices 1, 2, ...
Is broadcast to, the timer T is activated, and the state is set to “vacant transmission right” (S512 → S513 → the same processing as S514, S1001). The slave devices 1, 2, ... N receiving the transmission right permission (all devices) signal change the state to “transmission right free” (S701 → S702, S801 → S802 and S921 → S922). When the timer T times out, the master device 0 broadcasts a transmission right permission (all devices) signal to all the slave devices 1, 2, ... N, restarts the timer T, and sets the state to “vacation of transmission right” (S511). → S512 → S5
13 → S514, S1002).
【００１６】スレーブ装置１の制御部Ｃ１は、マスタ装
置０へのデータ送信の必要が発生すると、通信制御部Ｃ
Ｃ１に送信要求を行い、それを受信した通信制御部ＣＣ
１は、送信権要求（装置１）信号をマスタ装置０に送信
し、タイマＴａを起動する（Ｓ７２１→Ｓ７２２→Ｓ７
２３→Ｓ７２４、Ｓ１００３）。このタイムＴａの時間
内に送信権要求信号に対する応答信号である送信権許可
信号を受信しない場合、タイマＴａがタイムアウトし、
他のスレーブ装置の送信した送信権要求信号と衝突し、
マスタ装置０で正常に受信できなかったと判断し、再送
処理を起動する（Ｓ７４１）。再送にあたった、スレー
ブ装置１は、再送タイマＴｒを起動し（Ｓ７４２）、そ
の再送タイマＴｒのタイムアウトで送信権要求（装置
１）信号を再送し、タイマＴｒを再起動する（Ｓ７５１
→Ｓ７５２→Ｓ７５３→Ｓ７５４）。The control unit C1 of the slave device 1 receives the data transmission to the master device 0, and then the communication control unit C1.
The communication control unit CC that makes a transmission request to C1 and receives it
1 transmits a transmission right request (device 1) signal to the master device 0 and activates the timer Ta (S721 → S722 → S7).
23 → S724, S1003). When the transmission right permission signal, which is a response signal to the transmission right request signal, is not received within the time Ta, the timer Ta times out,
Collide with the transmission right request signal transmitted by another slave device,
It is determined that the master device 0 could not normally receive, and the retransmission process is activated (S741). The slave device 1 which has been retransmitted starts the retransmission timer Tr (S742), retransmits the transmission right request (device 1) signal when the retransmission timer Tr times out, and restarts the timer Tr (S751).
→ S752 → S753 → S754).
【００１７】マスタ装置０は送信権要求（装置１）信号
を正常受信すると、全スレーブ装置１，２…ｎに送信権
許可（装置１）信号を同報送信し、タイマＴを停止する
ことにより送信権許可（全装置）信号の周期的送信を停
止させ、状態を「送信権許可中」にする（Ｓ５０１→Ｓ
５０２→Ｓ５０３→Ｓ５０４、Ｓ１００４）。送信権許
可（装置１）信号を受信したスレーブ装置１は、装置番
号が自装置なので、タイマＴａおよび再送タイマＴｒが
起動中ならば停止させ、制御部Ｃ１に送信権が取得でき
たことを通知し、状態を「送信権使用中」にし、データ
の送信を可能にする（Ｓ７３１→Ｓ７３２→Ｓ７３３→
Ｓ７３４→Ｓ７３５）。送信権許可（装置１）信号を受
信したスレーブ装置２…ｎは、装置番号が他装置なの
で、状態を「送信権他装置使用中」にし、送信権要求信
号の送信を禁止にする（Ｓ７１１→Ｓ７１２）。When the master device 0 normally receives the transmission right request (device 1) signal, the master device 0 broadcasts the transmission right permission (device 1) signal to all the slave devices 1, 2, ... N, and stops the timer T. The periodic transmission of the transmission right permission (all devices) signal is stopped, and the state is changed to “transmission right permitting” (S501 → S).
502 → S503 → S504, S1004). The slave device 1 which has received the transmission right permission (device 1) signal has its own device number. Therefore, if the timer Ta and the retransmission timer Tr are running, they are stopped and the control unit C1 is notified that the transmission right has been acquired. Then, the state is set to “in use of transmission right” to enable data transmission (S731 → S732 → S733 →
S734 → S735). The slave devices 2 ... n that have received the transmission right permission (device 1) signal have the device number of another device, so the state is set to “transmission right other device in use” and the transmission of the transmission right request signal is prohibited (S711 → S712).
【００１８】スレーブ装置１の制御部Ｃ１は、送信権が
取得できると、データを送信するため、通信制御部ＣＣ
１にデータ送信の要求を行い、それを受信した通信制御
部ＣＣ１は、データを送信する（Ｓ９０１→Ｓ９０２→
Ｓ９０３、Ｓ１００５）。データを受信したマスタ装置
０は、送信権要求信号および送信権解放信号以外の信号
であり、その信号に対応した処理を行う（Ｓ６０１→Ｓ
６０２→Ｓ６０３）。スレーブ装置１の制御部Ｃ１は、
データの送信が完了すると、通信制御部ＣＣ１に送信権
解放要求を行い、それを受信した通信制御部ＣＣ１は、
送信権解放（装置１）信号を送信し、状態を「送信権空
き」にする（Ｓ９１１→Ｓ９１２→Ｓ９１３、Ｓ１００
６）。送信権解放要求（装置１）信号を受信したマスタ
装置０は、送信権許可（全装置）信号を全スレーブ装置
１，２…ｎに同報送信し、タイマＴを起動し、状態を
「送信権空き」にする（Ｓ６１１→Ｓ６１２→Ｓ６１３
→Ｓ６１４、Ｓ１００７）。送信権許可（全装置）信号
を受信したスレーブ装置２…ｎは、状態を「送信権空
き」にする。（Ｓ８０１→Ｓ８０２）。When the transmission right is acquired, the control unit C1 of the slave device 1 transmits data, and therefore, the communication control unit CC
1 requests data transmission, and the communication control unit CC1 having received the request transmits data (S901 → S902 →
S903, S1005). The master device 0 that has received the data is a signal other than the transmission right request signal and the transmission right release signal, and performs processing corresponding to the signal (S601 → S).
602 → S603). The control unit C1 of the slave device 1
When the data transmission is completed, the transmission right release request is sent to the communication control unit CC1, and the communication control unit CC1 which received the request releases the transmission right.
A transmission right release (device 1) signal is transmitted to set the state to “transmission right free” (S911 → S912 → S913, S100).
6). Upon receiving the transmission right release request (device 1) signal, the master device 0 broadcasts the transmission right permission (all devices) signal to all the slave devices 1, 2, ... Vacancy ”(S611 → S612 → S613
→ S614, S1007). The slave devices 2 ... n receiving the transmission right permission (all devices) signal set the state to “transmission right free”. (S801 → S802).
【００１９】[0019]
【発明の効果】以上説明したように本発明によれば、マ
スタ装置の送信はスレーブ装置の数に拘わらず１信号に
つき１回だけで済み、スレーブ装置は、マスタ装置１つ
だけに信号を送信すれば済み、送信権は不要になったと
きにすぐに解放され、他のスレーブ装置が使用可能で、
１つのスレーブ装置がデータ送信中は他のスレーブ装置
が信号を送信することはなく、衝突は発生しないので、
送信権制御に必要な装置の負荷と回線のトラフィックを
低く抑えることができる。As described above, according to the present invention, the master device needs to transmit only once per signal regardless of the number of slave devices, and the slave device transmits the signal to only one master device. The transmission right is released immediately when it is no longer needed, and other slave devices can be used.
While one slave device is transmitting data, the other slave device does not transmit a signal, so a collision does not occur,
It is possible to reduce the load on the device required for transmission right control and the line traffic.
【図１】本発明の一実施例におけるデータ伝送システム
の通信装置のブロック図である。FIG. 1 is a block diagram of a communication device of a data transmission system according to an embodiment of the present invention.
【図２】マスタ装置０の状態遷移例を示す。FIG. 2 shows an example of state transition of a master device 0.
【図３】スレーブ装置１，２…ｎの状態遷移例を示す。FIG. 3 shows an example of state transition of slave devices 1, ...
【図４】図５から図９に説明するＳＤＬ図の凡例を示
す。FIG. 4 shows a legend of the SDL diagram described in FIGS. 5 to 9.
【図５】マスタ装置０の送信制御部ＣＣ０の送信権空き
状態における動作を表すＳＤＬ図である。FIG. 5 is an SDL diagram showing the operation of the transmission control unit CC0 of the master device 0 in the transmission right idle state.
【図６】マスタ装置０の送信制御部ＣＣ０の送信権許可
中状態における動作を表すＳＤＬ図である。FIG. 6 is an SDL diagram showing an operation of a transmission control unit CC0 of the master device 0 in a transmission right permitting state.
【図７】スレーブ装置１，２…ｎの送信制御部ＣＣ１，
２…ｎの送信権空き状態における動作を表すＳＤＬ図で
ある。FIG. 7: Transmission control units CC1 of slave devices 1, ...
It is an SDL diagram showing operation | movement in the transmission right idle state of 2 ... n.
【図８】スレーブ装置１，２…ｎの送信制御部ＣＣ１，
２…ｎの送信権他装置使用中状態における動作を表すＳ
ＤＬ図である。FIG. 8: Transmission control units CC1 of slave devices 1, ...
S representing the operation in the state where the transmission right of 2 ... n is being used by another device
It is a DL figure.
【図９】スレーブ装置１，２…ｎの送信制御部ＣＣ１，
２…ｎの送信権使用中状態における動作を表すＳＤＬ図
である。FIG. 9: Transmission control unit CC1, of slave devices 1, ...
It is an SDL diagram showing the operation in the transmission right in use state of 2 ... n.
【図１０】マスタ装置０とスレーブ装置１，２…ｎの間
のデータ伝送のシーケンスの一例を示すシーケンス図で
ある。10 is a sequence diagram showing an example of a sequence of data transmission between the master device 0 and the slave devices 1, 2, ... N. FIG.
０ マスタ装置 １，２…ｎ スレーブ装置 Ｃ０，Ｃ１，Ｃ２…Ｃｎ 制御部 ＣＣ０，ＣＣ１，ＣＣ２…ＣＣｎ 通信制御部 Ｔ０，Ｔ１，Ｔ２…Ｔｎ 送信部 Ｒ０，Ｒ１，Ｒ２…Ｒｎ 受信部 0 Master device 1, 2,... N Slave device C0, C1, C2... Cn control unit CC0, CC1, CC2... CCn Communication control unit T0, T1, T2.
Claims (2)
し、前記通信装置のうちの１つは送信権制御を行うマス
タ装置として動作しかつ残りの複数がスレーブ装置とし
て動作し、前記マスタ装置は前記複数のスレーブ装置へ
の下り信号を同報送信し、前記複数のスレーブ装置は前
記マスタ装置への上り信号をランダムに送信するデータ
伝送システムにおいて、前記マスタ装置は上り回線が空
き状態のときには、前記複数のスレーブ装置に送信権要
求信号のみの送信を許可する信号を同報送信し、前記複
数のスレーブ装置のいずれかから送信権要求信号を受信
したときには、そのスレーブ装置が送信権を解放するま
での間、すべての信号の送信権を与える信号を前記複数
のスレーブ装置に同報送信して送信権要求信号を送信し
たスレーブ装置には送信権が与えられたことを知らせ、
その他のスレーブ装置には他のスレーブ装置に送信権が
渡り、送信権要求信号を含むすべての信号の送信が禁止
されたことを知らせることを特徴とする送信権制御方
法。1. The same communication line is shared by a plurality of communication devices, one of the communication devices operates as a master device that performs transmission right control, and the remaining plurality operates as slave devices, and the master device In the data transmission system, the device broadcasts a downlink signal to the plurality of slave devices, and the plurality of slave devices randomly transmits an uplink signal to the master device, wherein the master device is in an idle state. In some cases, a signal permitting the transmission of only the transmission right request signal is broadcast to the plurality of slave devices, and when the transmission right request signal is received from any of the plurality of slave devices, the slave device acquires the transmission right. Until the release, the slave device that has transmitted the transmission right request signal by broadcasting the signals that give the transmission right of all signals to the plurality of slave devices Notify that you have been granted the right to send
A transmission right control method characterized in that the transmission right is passed to the other slave device and the transmission of all signals including the transmission right request signal is prohibited.
みの送信を許可する信号を周期的に同報送信することを
特徴とする請求項１記載の送信権制御方法。2. The transmission right control method according to claim 1, wherein the master device periodically broadcasts a signal permitting transmission of only the transmission right request signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6201868A JPH0865299A (en) | 1994-08-26 | 1994-08-26 | Controlling method for transmission right |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6201868A JPH0865299A (en) | 1994-08-26 | 1994-08-26 | Controlling method for transmission right |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0865299A true JPH0865299A (en) | 1996-03-08 |
Family
ID=16448224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6201868A Pending JPH0865299A (en) | 1994-08-26 | 1994-08-26 | Controlling method for transmission right |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0865299A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373358C (en) * | 2002-10-15 | 2008-03-05 | 精工爱普生株式会社 | Image display system, device, method and program, image data output device and program |
| CN103116726A (en) * | 2012-12-31 | 2013-05-22 | 斐戈集团股份有限公司 | Research and development information storage and control method based on fashion design industry |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04256243A (en) * | 1991-02-07 | 1992-09-10 | Nippon Telegr & Teleph Corp <Ntt> | Contention control system |
-
1994
- 1994-08-26 JP JP6201868A patent/JPH0865299A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04256243A (en) * | 1991-02-07 | 1992-09-10 | Nippon Telegr & Teleph Corp <Ntt> | Contention control system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373358C (en) * | 2002-10-15 | 2008-03-05 | 精工爱普生株式会社 | Image display system, device, method and program, image data output device and program |
| US7420527B2 (en) | 2002-10-15 | 2008-09-02 | Seiko Epson Corporation | Image displaying system, image displaying device, image data outputting device, image displaying method, image displaying program, and image data outputting program |
| US8698702B2 (en) | 2002-10-15 | 2014-04-15 | Seiko Epson Corporation | Image displaying system, image displaying device, image data outputting device, image displaying method, image displaying program, and image data outputting program |
| US10319344B2 (en) | 2002-10-15 | 2019-06-11 | Seiko Epson Corporation | Image displaying system, image displaying device, image data outputting device, image displaying method, image displaying program, and image data outputting program |
| CN103116726A (en) * | 2012-12-31 | 2013-05-22 | 斐戈集团股份有限公司 | Research and development information storage and control method based on fashion design industry |
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