JPH023850A - Gpib communication system - Google Patents
Gpib communication systemInfo
- Publication number
- JPH023850A JPH023850A JP63149683A JP14968388A JPH023850A JP H023850 A JPH023850 A JP H023850A JP 63149683 A JP63149683 A JP 63149683A JP 14968388 A JP14968388 A JP 14968388A JP H023850 A JPH023850 A JP H023850A
- Authority
- JP
- Japan
- Prior art keywords
- master device
- service request
- slave devices
- slave
- periodically
- 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.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はＧＰＩＢ （ＩＥＥＥ４８８汎用バスインター
フェース）におけるマスタ装置（コントローラ〉のスレ
ーブ装置（トーカ又はリスナ）よりのサービス要求の受
け付けに係わるＧＰＩＢ通信方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a GPIB (IEEE488 general-purpose bus interface) communication method related to receiving a service request from a slave device (talker or listener) of a master device (controller). .
従来、第２図に示すように、マスタ装置２とスレーブ装
置３，４とがＧＰＩＢバスインターフェース１で接続さ
れ、マスタ装置２がスレーブ装置３．４よりのＳＲＱ信
号を検出するＳＲＱ検出部６を有する。この構成におい
て、スレーブ装置３゜４のいずれかがＧＰＩＢバスイン
ターフェース１を介してＳＲＱ信号をアクティブにする
ことにより、マスタ装置２にサービスの要求を通知する
。Conventionally, as shown in FIG. 2, a master device 2 and slave devices 3 and 4 are connected via a GPIB bus interface 1, and the master device 2 has an SRQ detection section 6 that detects the SRQ signal from the slave devices 3 and 4. have In this configuration, one of the slave devices 3 to 4 notifies the master device 2 of a service request by activating the SRQ signal via the GPIB bus interface 1.
マスタ装置２はＳＲＱ検出部６よりサービスの要求を検
出すると、スレーブ装置３，４に対して順次シリアルボ
ール（ＳＴＢを受信する）を行い、要求元のスレーブ装
置を捜し出す。When the master device 2 detects a service request from the SRQ detection unit 6, it sequentially performs a serial ball (receives STB) to the slave devices 3 and 4, and searches for the requesting slave device.
上述した従来のＧＰＩＢ通信方式では、マスタ装置のデ
ータ転送の方向法めの点で次の問題がある。すなわち、
スレーブ装置が自律的にＳＲＱ信号をマスタ装置に送出
するので、非同期転送となり、データ転送の送受信衝突
が発生する。そのため、送受信衝突に対する処理がマス
タ装置に必要となり、処理の簡潔化が困難になる。The conventional GPIB communication system described above has the following problem in terms of the direction of data transfer by the master device. That is,
Since the slave device autonomously sends the SRQ signal to the master device, asynchronous transfer occurs and a collision between transmission and reception of data transfer occurs. Therefore, the master device is required to process transmission/reception collisions, making it difficult to simplify the process.
本発明はマスタ装置と複数のスレーブ装置とをＧＰＩＢ
バスインターフェースで接続したＧＰＩＢ通信方式にお
いて、前記マスタ装置にシリアルボール同期部を設け、
前記スレーブ装置のステータスバイトを周期的に読み取
り、前記スレーブ装置のサービス要求を受け付ける構成
である。The present invention connects a master device and a plurality of slave devices to GPIB
In the GPIB communication system connected by a bus interface, the master device is provided with a serial ball synchronization section,
The configuration is such that the status byte of the slave device is periodically read and a service request from the slave device is accepted.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
一実施例を示す第１図を参照すると、マスタ装置２とス
レーブ装置３，４とがＧＰＩＢバスインターフェース１
を介して接続され、マスタ装置２がシリアルボールを周
期的に実行するシリアルボール周期部５を有する。スレ
ーブ装置３．４のいずれかがＧＰＩＢバスインターフェ
ース１を介してＳＲＱ信号をアクティブにし、マスタ装
置２にサービスの要求を通知するが、マスタ装置２はＳ
ＲＱ検出部を排除しているので、サービス要求を認知し
ない、シリアルボール周期部５により、マスタ装置２が
スレーブ装置３．４のステータスバイトを周期的に読み
出し、サービス要求を検出する。つまり、スレーブ装置
３，４よりのサービス要求の検出はマスタ装置２の主導
により行なわれる。Referring to FIG. 1 showing one embodiment, a master device 2 and slave devices 3 and 4 are connected to a GPIB bus interface 1.
The master device 2 has a serial ball periodic unit 5 which periodically executes serial balls. One of the slave devices 3.4 activates the SRQ signal via the GPIB bus interface 1 and notifies the master device 2 of a request for service, but the master device 2
Since the RQ detection section is omitted, the master device 2 periodically reads the status byte of the slave device 3.4 and detects a service request using the serial ball periodic section 5, which does not recognize a service request. That is, detection of service requests from the slave devices 3 and 4 is performed under the initiative of the master device 2.
以上説明したように本発明は、マスタ装置が周期的にシ
リアルボールを行い、ステータスバイトを読み取ること
により、スレーブ装置からの自律的なサービス要求を抑
え、マスタ装置の制御によるデータ転送を可能にする。As explained above, in the present invention, the master device periodically performs serial balls and reads the status byte, thereby suppressing autonomous service requests from slave devices and enabling data transfer under the control of the master device. .
第１図は本発明の一実施例を示す構成図、第２図は従来
例を示す構成図である。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example.
Claims (1)
ターフェースで接続したＧＰＩＢ通信方式において、前
記マスタ装置にシリアルボール同期部を設け、前記スレ
ーブ装置のステータスバイトを周期的に読み取り、前記
スレーブ装置のサービス要求を受け付けることを特徴と
するＧＰＩＢ通信方式。In a GPIB communication system in which a master device and a plurality of slave devices are connected via a GPIB bus interface, the master device is provided with a serial ball synchronization section, which periodically reads the status byte of the slave device and requests service from the slave device. A GPIB communication method that is characterized by accepting
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63149683A JPH023850A (en) | 1988-06-17 | 1988-06-17 | Gpib communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63149683A JPH023850A (en) | 1988-06-17 | 1988-06-17 | Gpib communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH023850A true JPH023850A (en) | 1990-01-09 |
Family
ID=15480533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63149683A Pending JPH023850A (en) | 1988-06-17 | 1988-06-17 | Gpib communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH023850A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760854B2 (en) | 2000-01-15 | 2004-07-06 | Cirrus Logic, Inc. | Method and apparatus for handling a framing error at a serial interface by forcing invalid commands to be read upon determine the command is invalid |
-
1988
- 1988-06-17 JP JP63149683A patent/JPH023850A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760854B2 (en) | 2000-01-15 | 2004-07-06 | Cirrus Logic, Inc. | Method and apparatus for handling a framing error at a serial interface by forcing invalid commands to be read upon determine the command is invalid |
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