JPS6340382B2 - - Google Patents
Info
- Publication number
- JPS6340382B2 JPS6340382B2 JP55104821A JP10482180A JPS6340382B2 JP S6340382 B2 JPS6340382 B2 JP S6340382B2 JP 55104821 A JP55104821 A JP 55104821A JP 10482180 A JP10482180 A JP 10482180A JP S6340382 B2 JPS6340382 B2 JP S6340382B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- terminal
- signal
- permission signal
- request signal
- 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 29
- 208000033748 Device issues Diseases 0.000 claims 1
- CCPHAMSKHBDMDS-UHFFFAOYSA-N Chetoseminudin B Natural products C=1NC2=CC=CC=C2C=1CC1(SC)NC(=O)C(CO)(SC)N(C)C1=O CCPHAMSKHBDMDS-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission 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)
- Small-Scale Networks (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Communication Control (AREA)
Description
【発明の詳細な説明】
本発明はマルチドロツプ型式に接続された複数
の端末装置に対し、適切な送信優先制御のできる
送信権獲得制御方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission right acquisition control system that allows appropriate transmission priority control for a plurality of terminal devices connected in a multi-drop type.
第１図に示すように端末制御装置TCに対しマ
ルチドロツプ型式に接続される複数の端末装置
Ｉ／Ｏを有し、複数個の端末をまとめて１グルー
プとし、端末制御装置TCはグループ単位でポー
リングをかけることは既に提案されている。即ち
Ｉ／Ｏ−１、Ｉ／Ｏ−２、………をグループ１、
………、Ｉ／Ｏ−（ｎ−３）、Ｉ／Ｏ−（ｎ−２）、
Ｉ／Ｏ−（ｎ−１）、Ｉ／Ｏ−ｎをグループＮのよ
うにまとめ、端末制御装置TCは送受信を効率良
く行なうためにグループに対しポーリングをかけ
るようにし、グループ内で送信すべきデータを持
つていて優先順位の高い端末装置のみがデータを
送出する構成となつている。優先順位は端末制御
装置TCに近い方から順次高→低とされ、送信制
御は送信要求信号（以下RSと略記する）及び送
信許可信号（以下CSと略記する）を使用して行
なわれる。第２図に示すようにRSとCSの各信号
伝送路が端末装置Ｉ／Ｏ−Ａ，Ｉ／Ｏ−Ｂ，……
…と接続されているとき第３図に示すタイミング
チヤートのように動作する。端末制御装置TCか
らのグループポーリング信号GPが端末から見て
受信データ線RDに到来したときＩ／Ｏ−ＢのRS
制御部RS−Ｃ(B)は直ぐRSo信号を立上らせ、
Ｉ／Ｏ−ＢにおけるRSi信号とオア結合した信号
RSo′をＩ／Ｏ−Ａへ伝送し、該端末のRSi信号と
する。Ｉ／Ｏ−ＡのRS制御部RS−Ｃ(A)は自己の
RS立上りの有無が不明であるが、下位の端末か
らRSo′即ちRSiがあつたため、端末制御装置TC
に伝送し直ぐCSiと返つてくる。このＩ／Ｏ−Ａ
におけるCSiは下位のＩ／Ｏ−Ｂに対しCSoとし
て伝送されＩ／Ｏ−ＢにおけるCSiとなる。この
ときＩ／Ｏ−Ａは送信データがなく、Ｉ／Ｏ−Ｂ
にあるときは特に問題はないが、Ｉ／Ｏ−Ａにあ
つたときはＩ／Ｏ−Ｂに関係なく優先順位の高い
Ｉ／Ｏ−Ａが送信を行なうことができる。端末装
置が送信可能となる条件はRSpがオン、CSiがオ
ンを共に満足することであるから、RSpオンを該
端末は保持する必要があり、Ｉ／Ｏ−ＢはRSpオ
ンを続ける積りがあつても当初のグループポーリ
ングに対しＩ／Ｏ−Ａが遅れてRSpオンとしたた
め、Ｉ／Ｏ−ＡのCSp即ちＩ／Ｏ−ＢのCSiが中
断してＩ／Ｏ−Ｂの制御が乱れる。即ちＩ／Ｏ−
ＢはＩ／Ｏ−ＡのRSpオンの発生時期を考慮せず
に信号状態を判断していると発生時期に略100μ
秒程度の遅れがあるため不都合の起ることが多
い。 As shown in Figure 1, it has multiple terminal devices I/O connected to the terminal control device TC in a multi-drop format, and multiple terminals are grouped together, and the terminal control device TC polls in units of groups. It has already been proposed to apply That is, I/O-1, I/O-2, etc. are group 1,
......, I/O-(n-3), I/O-(n-2),
I/O-(n-1) and I/O-n are grouped into group N, and the terminal control device TC polls the group in order to perform transmission and reception efficiently, and transmits within the group. The configuration is such that only terminal devices that have data and have a high priority transmit data. The priority is set from high to low in order from the one closest to the terminal control device TC, and transmission control is performed using a transmission request signal (hereinafter abbreviated as RS) and a transmission permission signal (hereinafter abbreviated as CS). As shown in Fig. 2, each signal transmission path of RS and CS is connected to terminal equipment I/O-A, I/O-B,...
..., it operates as shown in the timing chart shown in Figure 3. When the group polling signal GP from the terminal control device TC arrives at the reception data line RD from the terminal, the I/O-B RS
The control unit RS-C(B) immediately raises the RSo signal,
Signal ORed with RSi signal in I/O-B
RSo' is transmitted to the I/O-A and used as the RSi signal of the terminal. The RS control unit RS-C(A) of I/O-A is
Although it is unknown whether RS rises or not, since RSo′, that is, RSi was received from the lower terminal, the terminal control device TC
CSi is immediately returned. This I/O-A
The CSi in is transmitted as CSo to the lower I/O-B and becomes CS i in the I/O-B. At this time, I/O-A has no data to send, and I/O-B
There is no particular problem when it is in I/O-A, but when it is in I/O-A, I/O-A with a higher priority can perform the transmission regardless of I/O-B. The condition for a terminal device to be able to transmit is that both RS p is on and CS i is on, so the terminal needs to keep RS p on, and I/O-B keeps RS p on. Even if there was a plan to continue, I/O-A turned on RS p late with respect to the initial group polling, so CS p of I/O-A, that is, CS i of I/O-B, was interrupted and I/O -B's control is disrupted. That is, I/O-
B is approximately 100μ when the signal state is judged without considering the timing of I/O-A's RS p turn-on.
There is a delay of about seconds, which often causes inconvenience.
本発明の目的は前述の欠点を改善し、オンされ
た送信要求信号について所定時間オン状態を保持
させることにより、複数の各端末装置に対し適切
な送信権獲得制御のできる送信権獲得制御方式を
提供することにある。 An object of the present invention is to improve the above-mentioned drawbacks, and to provide a transmission right acquisition control method that allows appropriate transmission right acquisition control for each of a plurality of terminal devices by keeping the turned-on transmission request signal on for a predetermined period of time. It is about providing.
以下図面に示す本発明の実施例について説明す
る。第４図は本発明の実施例として第２図と対応
して示す図であつて、同一符号は同様のものを示
す。TMはタイマであつて、RSオンの発生時期
からの時間経過を計測し、前述のように端末装置
Ｉ／Ｏの動作遅れタイミングの時間と略等しい時
間ＴだけRSオンを保持させるようにRS制御部
RS−Ｃを制御する。そしてタイマTMは該所定
時間経過後にCS制御部CS−Ｃに通知し、CSを下
位装置に転送するかどうか判断させる。したがつ
て第５図に示すように各RSp信号が時間Ｔ延伸さ
れているから、ハツチングを施した時間Thの間
には、Ｉ／Ｏ−ＡからＩ／Ｏ−ＣまでのRSp信号
がすべてオン状態となつている。したがつて時間
Thの間に、最初にRSをオンとしたＩ／Ｏ−Ｂ
が、自己の送信データの有無、グループ内で優先
順位の異なる端末の条件を判断して、送信するか
CSを下位の端末へ送るか等の判断を行なう。第
４図・第５図の場合を更に詳細に説明する。まず
ポーリング信号GPがRD線に到来したとき、端末
ＢのRSoが立上り下位端末ＣのRSiの“Ｌ”信号
とオア結合したRSo′が端末ＡのRSiとなる。この
RSiは端末制御装置TCに送られ、CSiが返つて来
る。このCSiは直ぐCSoとなり、端末Ｂに送られ
CSiとなる。端末Ｂは時間Thにおいて自己の送信
データの有無を送信判定部において判断し、次に
グループ内で優先順位の異なる端末の条件を判断
し、この場合端末ＡからのCSo（端末ＢではCSi）
を見ると、オフ状態となつているから、端末Ｂか
ら制御装置への送信が出来ないと判断する。した
がつて端末ＣへのCSoのオン送出は直ぐ出来ない
ことが判る。 Embodiments of the present invention shown in the drawings will be described below. FIG. 4 is a diagram corresponding to FIG. 2 as an embodiment of the present invention, and the same reference numerals indicate the same parts. TM is a timer that measures the passage of time from the time when RS is turned on, and performs RS control to keep RS on for a time T that is approximately equal to the operation delay timing of the terminal device I/O as described above. Department
Controls RS-C. Then, the timer TM notifies the CS control unit CS-C after the predetermined time has elapsed, and makes it decide whether to transfer the CS to the lower device. Therefore, as shown in FIG. 5, each RS p signal is stretched by time T, so during the hatched time Th, the RS p signal from I/O-A to I/O-C is are all turned on. therefore time
I/O-B that first turned on RS during Th
determines the presence or absence of its own transmission data and the conditions of terminals with different priorities within the group, and then determines whether to transmit data.
Decide whether to send the CS to a lower-level terminal, etc. The cases shown in FIGS. 4 and 5 will be explained in more detail. First, when the polling signal GP arrives on the RD line, RSo of terminal B rises and RSo' which is OR-combined with the "L" signal of RSi of lower terminal C becomes RSi of terminal A. this
RSi is sent to the terminal controller TC, and CSi is returned. This CSi immediately becomes CSo and is sent to terminal B.
Becomes CSi. Terminal B determines whether or not it has its own transmission data at time Th, and then determines the conditions of terminals with different priorities within the group. In this case, CSo from terminal A (CSi for terminal B)
Since it is in the off state, it is determined that transmission from terminal B to the control device is not possible. Therefore, it can be seen that on-sending of CSo to terminal C cannot be done immediately.
このようにして本発明によると端末装置がグル
ープポーリングされたときRSオンの立上り時期
について若干の時間差があつても、簡易な構成追
加によつてその影響を除くことができ、正確な動
作が可能である。 In this way, according to the present invention, even if there is a slight time difference in the rise timing of RS-ON when terminal devices are subjected to group polling, the influence can be removed by simple configuration additions, and accurate operation is possible. It is.
第１図は複数の端末装置をグループ制御する説
明図、第２図・第３図は従来の端末装置と送信要
求信号発生時の動作タイムチヤート、第４図、第
５図は本発明の実施例の構成図と、動作タイムチ
ヤートを示す。
TC……端末制御装置、Ｉ／Ｏ−Ａ，Ｉ／Ｏ−
Ｂ、……端末装置、RS−Ｃ(A)，RS−Ｃ(B)……
RS信号制御部、CS−Ｃ(A)，CS−Ｃ(B)……CS信
号制御部、TM……タイマ。
FIG. 1 is an explanatory diagram of group control of multiple terminal devices, FIGS. 2 and 3 are conventional terminal devices and operation time charts when a transmission request signal is generated, and FIGS. 4 and 5 are implementations of the present invention. An example configuration diagram and operation time chart are shown. TC...Terminal control device, I/O-A, I/O-
B...Terminal device, RS-C(A), RS-C(B)...
RS signal control unit, CS-C(A), CS-C(B)...CS signal control unit, TM...timer.
Claims (1)
グされたとき一斉に応答して送信要求信号を発し
送信特可信号を検出した時点で送信権を得て該制
御装置との間でデータ授受する複数の端末装置
と、該送信許可信号が伝送され、該複数の端末装
置の各々が直列に接続された送信許可信号線を有
し、該端末装置は送信要求信号を発した後、該送
信許可信号線に送信許可信号が検出された時、当
該信号線に直列に接続される当該端末装置より後
位の端末装置に該送信許可信号を中継せしめない
よう構成されるデータ授受システムにおいて、 制御装置よりグループポーリングされてから、
各端末が送信要求信号を発するまでの動作遅れの
最大時間とほぼ等しい所定時間を、各端末が送信
要求信号を発した時点から計時するタイマ手段を
設け、該各端末装置は該送信要求信号を発した時
点より該所定時間後に該許可信号の有無を検出し
てデータ送信権を得ること を特徴とする送信権獲得制御方式。[Scope of Claims] 1. When the control devices are group polled, they respond all at once and issue a transmission request signal, and when they detect a transmission privilege signal, they obtain the transmission right and establish a connection between the control device and the control device. A plurality of terminal devices that exchange data and the transmission permission signal are transmitted, each of the plurality of terminal devices has a transmission permission signal line connected in series, and after the terminal device issues a transmission request signal, the transmission permission signal is transmitted. , a data exchange system configured such that when a transmission permission signal is detected on the transmission permission signal line, the transmission permission signal is not relayed to a terminal device downstream of the terminal device connected in series to the signal line. After group polling is performed from the control device,
A timer means is provided for counting a predetermined time approximately equal to the maximum operation delay time until each terminal issues the transmission request signal from the time when each terminal issues the transmission request signal, and each terminal device transmits the transmission request signal. A transmission right acquisition control system characterized in that the data transmission right is acquired by detecting the presence or absence of the permission signal after the predetermined time from the time when the permission signal is issued.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10482180A JPS5730441A (en) | 1980-07-30 | 1980-07-30 | Control system for acquisition of right of transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10482180A JPS5730441A (en) | 1980-07-30 | 1980-07-30 | Control system for acquisition of right of transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5730441A JPS5730441A (en) | 1982-02-18 |
| JPS6340382B2 true JPS6340382B2 (en) | 1988-08-10 |
Family
ID=14391058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10482180A Granted JPS5730441A (en) | 1980-07-30 | 1980-07-30 | Control system for acquisition of right of transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5730441A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1263721A (en) * | 1985-10-18 | 1989-12-05 | Owen Lloyd Nelson | Communication system for the transfer of small digital message blocks and large digital message blocks |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5632855A (en) * | 1979-08-27 | 1981-04-02 | Fujitsu Ltd | Control circuit for right of transmission |
-
1980
- 1980-07-30 JP JP10482180A patent/JPS5730441A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5632855A (en) * | 1979-08-27 | 1981-04-02 | Fujitsu Ltd | Control circuit for right of transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5730441A (en) | 1982-02-18 |
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