JPH03235546A - Data communication system - Google Patents
Data communication systemInfo
- Publication number
- JPH03235546A JPH03235546A JP2032889A JP3288990A JPH03235546A JP H03235546 A JPH03235546 A JP H03235546A JP 2032889 A JP2032889 A JP 2032889A JP 3288990 A JP3288990 A JP 3288990A JP H03235546 A JPH03235546 A JP H03235546A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- terminal
- host computer
- control device
- terminal control
- 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 abstract description 102
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 33
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はホストコンピュータと端末装置間を端末制御装
置の通信中継機能を用いて接続した通信システムに関し
、特にその端末制御装置及び通信回線のダウンを検出し
別の端末制御装置に通信中継機能を肩代りさせるデータ
通信方式に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication system in which a host computer and a terminal device are connected using a communication relay function of a terminal control device, and in particular, the present invention relates to a communication system in which a host computer and a terminal device are connected using a communication relay function of a terminal control device, and in particular, The present invention relates to a data communication method that detects a terminal control device and transfers the communication relay function to another terminal control device.
従来、データ通信方式は通信中継装置となる端末制御装
置あるいは通信回線が何らかの障害によりダウンすると
、その端末制御装置あるいは通信回線が復旧するまでホ
ストコンピュータと端末装置間のデータ通信が中断され
、場合によって回復できない障害を引き起こしていた。Conventionally, in data communication systems, when a terminal control device serving as a communication relay device or a communication line goes down due to some kind of failure, data communication between the host computer and the terminal device is interrupted until the terminal control device or communication line is restored. This caused irreversible damage.
上述した従来のデータ通信方式は通・信中継装置となる
端末制御装置が一つの通信システムに一台しかなく、ま
た端末制御装置と端末装置とが蜜結合な関係で接続され
ているので、通信回線がダウンした場合には当該通信回
線の復旧を待たねばならず、端末制御装置がダウンした
場合には端末制御装置のみならず端末装置も含めて再立
ち上げを行なわなければならず、さらに通信を行なって
いない他の端末装置にも影響が出るという欠点がある。In the conventional data communication method described above, there is only one terminal control device that serves as a communication relay device in one communication system, and the terminal control device and the terminal device are connected in a tightly coupled relationship. If a line goes down, you have to wait for the communication line to be restored, and if a terminal control device goes down, you have to restart not only the terminal control device but also the terminal device, and then restart the communication line. This has the disadvantage that it also affects other terminal devices that do not perform this function.
本発明のデータ通信方式は、複数の端末装置と、前記端
末装置とバス型の通信回線によって接続された複数の端
末制御装置と、前記端末制御装置と通信回線によって接
続されたホストコンピュータと、前記端末制御装置の通
信中継機能によって端末装置とホストコンピュータがデ
ータ転送を行っている際に互いの動作状況を監視する手
段とを有し、現在稼働中の端末制御装置および通信回線
がダウンした事を認識すると別の端末制御装置を切り換
え使用し、ホストコンピュータと端末装置間の通信を支
障なく継続させる。The data communication system of the present invention includes: a plurality of terminal devices; a plurality of terminal control devices connected to the terminal devices via a bus-type communication line; a host computer connected to the terminal control device via a communication line; It has a means for monitoring the operating status of each other when the terminal device and the host computer are transferring data using the communication relay function of the terminal control device, and it is possible to detect when the terminal control device and the communication line currently in operation are down. When recognized, another terminal control device is switched to use, and communication between the host computer and the terminal device continues without any trouble.
次に、本発明について7面を参照して説明する。 Next, the present invention will be explained with reference to the seventh page.
第1図は本発明の一実施例のシステム構成図である。FIG. 1 is a system configuration diagram of an embodiment of the present invention.
今、端末装置1とホストコンピュータ4とが正常に通信
している状態を考える。端末装置1はバス型通信回線ら
によって端末制御装置2及び端末制御装N3に接続され
、さらにそれぞれ通信回線6及び通信回線7を経由して
ホストコンピュータ4と接続されている。端末装置1上
のアプリケーションプログラム(以下、APという。)
14からの通信データは通信制御部11の制御によりバ
ス型通信回線5を経由して端末制御装置2上の通信中継
部23によって中継され、再び通信制御部21を通って
通信回線6を経由し、ホストコンピュータ4上の通信制
御部41を通ってAP44に到達する。下りのデータの
場合は逆のルートをたどる。Now, assume that the terminal device 1 and the host computer 4 are communicating normally. The terminal device 1 is connected to a terminal control device 2 and a terminal control device N3 via a bus-type communication line, and is further connected to a host computer 4 via a communication line 6 and a communication line 7, respectively. Application program on terminal device 1 (hereinafter referred to as AP)
The communication data from 14 is relayed by the communication relay unit 23 on the terminal control device 2 via the bus-type communication line 5 under the control of the communication control unit 11, and then passes through the communication control unit 21 again and via the communication line 6. , reaches the AP 44 through the communication control unit 41 on the host computer 4. For downlink data, take the opposite route.
AP14とAP44間が上記ルートにて通信している際
、端末装置1上のダウン検出部12と端末制御装置2上
のダウン検出通知部22の間及びホストコンピュータ1
上のダウン検出部42と端末制御装置2上のダウン検出
通知部22の間では、それぞれバス型通信回線5及び通
信回線6を経由して各装置のダウンを検出する為の監視
用データがやりとりされている。つまり、ダウン検出部
12は端末装!1が正常に動作している旨をダウン検出
通知部22に通知し、ダウン検出通知部22は端末制御
装置2が正常に動作している旨とホストコンピュータ4
との通信路も正常に確保出来ている旨をダウン検出部1
2に通知する。同様にダウン検出部42はホストコンピ
ュータ4が正常に動作している旨をダウン検出通知部2
2に通知し、ダウン検出通知部22は端末装置1上のダ
ウン検出部12から受けとった正常通知をダウン検出部
42に通知する。When the AP 14 and the AP 44 are communicating through the above route, the communication between the down detection unit 12 on the terminal device 1 and the down detection notification unit 22 on the terminal control device 2 and the host computer 1
Monitoring data for detecting down of each device is exchanged between the down detection unit 42 on the top and the down detection notification unit 22 on the terminal control device 2 via the bus type communication line 5 and the communication line 6, respectively. has been done. In other words, the down detection unit 12 is a terminal device! The down detection notification unit 22 notifies the host computer 4 that the terminal control device 2 is operating normally.
Down detection unit 1 confirms that the communication channel with
Notify 2. Similarly, the down detection unit 42 informs the down detection notification unit 2 that the host computer 4 is operating normally.
2, and the down detection notification section 22 notifies the down detection section 42 of the normal notification received from the down detection section 12 on the terminal device 1.
上記のようにして端末装置1とホストコンピュータ4と
の間の通信は正常に行なわれていることがダウン検出部
12および42.ダウン検出通知部22の三者で認識さ
れる。本システムではこの監視用データを一定間隔毎に
通知し合って通信回線、各装置の状態を監視する。The down detection units 12 and 42 confirm that communication between the terminal device 1 and the host computer 4 is being performed normally as described above. This is recognized by three parties including the down detection notification section 22. This system monitors the status of the communication line and each device by notifying each other of this monitoring data at regular intervals.
今、端末制御装置2が何らかの障害にてダウンした場合
を考える。このとき端末装置1上のダウン検出部12か
ら出た監視データに対し、端末制御装置2上のダウン検
出通知部22は応答する事が出来ない為、ダウン検出部
12は一定時間応答を待った後に再度監視データを送出
し、これを−定回数くり返した後に応答が無い事をもっ
て端末制御装置2のダウンを認識する。同様にホストコ
ンピュータ4も端末制御装置2のダウンを認識する。Now, let us consider a case where the terminal control device 2 goes down due to some kind of failure. At this time, since the down detection notification section 22 on the terminal control device 2 cannot respond to the monitoring data output from the down detection section 12 on the terminal device 1, the down detection section 12 waits for a response for a certain period of time. The monitoring data is sent out again, and when there is no response after repeating this a certain number of times, it is recognized that the terminal control device 2 is down. Similarly, the host computer 4 also recognizes that the terminal control device 2 is down.
障害を認識したダウン検出部12は通信回線切り替え部
13に端末制御装置2のダウンを通知し、これを受けた
通信回線切り替え部13は外部記憶装置15上の通信パ
ラメータファイル16の内容を読み込む。通信パラター
タフアル16中には障害時の切り替え光通信中継装置と
なる端末制御装置3の通信用パラメータが格納されてお
り、この情報に従って通信回線切り替え部13は通信制
御部11に端末制御装置3を中継してホストコンピュー
タ4と接続するよう指令を出す。Recognizing the failure, the down detection section 12 notifies the communication line switching section 13 that the terminal control device 2 is down, and upon receiving this, the communication line switching section 13 reads the contents of the communication parameter file 16 on the external storage device 15 . The communication parameter file 16 stores communication parameters for the terminal control device 3, which becomes the switching optical communication relay device in the event of a failure, and according to this information, the communication line switching unit 13 relays the terminal control device 3 to the communication control unit 11. and issues a command to connect with the host computer 4.
この時、ホストコンピュータ4上のダウン検出部42も
同様に通信回線切り替え部43に障害を通知し、外部記
憶装置45上の通信パラメータフアイル46中の障害発
生時の代替端末制御装置の通信パラメータを通信制御部
41に渡す。通信制御部41はこの情報によりAP44
と論理(物理)通信回線とのつながりを通信回線6から
通信回線7へ切り替え、ダウン検出部12および42ダ
ウン検出通知部32の三者で互いの正常を確認し合った
後、AP14とAP44のデータ通信を再開する。At this time, the down detection unit 42 on the host computer 4 similarly notifies the communication line switching unit 43 of the failure, and updates the communication parameters of the alternative terminal control device at the time of failure in the communication parameter file 46 on the external storage device 45. It is passed to the communication control unit 41. The communication control unit 41 uses this information to
After switching the connection between the communication line 6 and the logical (physical) communication line from the communication line 6 to the communication line 7, and confirming the normality of each other by the down detection unit 12 and the down detection notification unit 32, the connection between the AP 14 and the AP 44 is changed. Resume data communication.
但し、端末制御装置2が端末制御装置3に切り替えられ
た事はAP14.’44には通知されず、端末操作員は
通信中継装置の障害を知らずに業務を続ける事が出来る
。仮にこの端末制御装置3がダウンしても他の端末制御
装置が正常に稼働中か又は端末制御装置2が復旧してい
れば切り替えは際限なく行なわれ、AP14とAP44
開のデータ通信は保障される。However, the fact that the terminal control device 2 was switched to the terminal control device 3 is AP14. '44 is not notified, and the terminal operator can continue his work without knowing about the failure of the communication relay equipment. Even if this terminal control device 3 goes down, as long as other terminal control devices are operating normally or the terminal control device 2 is restored, switching will be performed without limit, and the AP14 and AP44
Open data communication is guaranteed.
次に、端末装置1.端末制御装置2.及びホストコンピ
ュータ4にて通信を行っている時の通信回線6のダウン
について説明する。このときダウン検出通知部22は通
信制御部21から通信回線6のダウンを通知される。ダ
ウン検出通知部22はこの回線ダウンの情報をダウン情
報検出部]2に伝える。一方、ダウン検出部42は通信
制御部41より通信回線6のダウンを通知され、端末制
御装置2がダウンした際と同様に通信中継装置の切り替
えが行なわれ、AP14とAP44のデータ通信は保障
される。ここで通信回線のダウンとは、例えばパケット
回線のダウン等を意味し、その障害通知は通信制御部2
1又は41が認識し、ダウン検出通知部22又はダウン
検出部42に通知される。Next, the terminal device 1. Terminal control device 2. A description will now be given of the failure of the communication line 6 when the host computer 4 is communicating. At this time, the down detection notification section 22 is notified by the communication control section 21 that the communication line 6 is down. The down detection notification section 22 transmits this line down information to the down information detection section]2. On the other hand, the down detection unit 42 is notified by the communication control unit 41 that the communication line 6 is down, and the communication relay device is switched in the same way as when the terminal control device 2 goes down, and data communication between the AP 14 and the AP 44 is guaranteed. Ru. Here, the communication line down means, for example, the packet line goes down, and the failure notification is sent to the communication control unit 2.
1 or 41 is recognized, and the down detection notification section 22 or the down detection section 42 is notified.
次に、端末装置1.端末制御装置2及びホストコンピュ
ータ4にて通信を行っている際のホストコンピュータ4
のダウンについて説明する。ホストコンピュータ4がダ
ウンすると、ダウン検出通知部22はホストコンピュー
タ4からの監視用データが一定時間送られて来ないこと
からホストコンピュータ4のダウンを認識する。この時
、ダウン検出通知部22はダウン検出部12に対してホ
ストコンピュータ4のダウンを通知し、端末制御装置を
切り替えてもホストコンピュータ4とはデータ通信が不
可能である旨を認識させる。従ってこの場合に限りダウ
ン検出部12はAP14に障害の通知を行い、AP14
はデータ通信を終了してホストコンピュータ4の復旧を
待つ。Next, the terminal device 1. Host computer 4 when communicating between terminal control device 2 and host computer 4
Explain about down. When the host computer 4 goes down, the down detection notification section 22 recognizes that the host computer 4 is down because monitoring data is not sent from the host computer 4 for a certain period of time. At this time, the down detection notification section 22 notifies the down detection section 12 that the host computer 4 is down, and makes it aware that data communication with the host computer 4 is impossible even if the terminal control device is switched. Therefore, only in this case, the down detection unit 12 notifies the AP 14 of the failure, and
terminates data communication and waits for the host computer 4 to recover.
通信回線のダウンは通信制御部の回線監視によって行わ
れ、端末装置、端末制御装置、及びホストコンピュータ
のダウンはダウン検出(通知)部間の監視用データのや
りとりにより行われる。したがってこれらのダウンを区
別できるので、通信回線及び端末制御装置のダウン時の
み端末制御装置を切り替えることができる。When a communication line goes down, the communication control section monitors the line, and when a terminal device, terminal control device, and host computer go down, it is done by exchanging monitoring data between the down detection (notification) sections. Therefore, since these down states can be distinguished, the terminal control device can be switched only when the communication line and the terminal control device are down.
以上説明したように、本発明は一つの通信システムに複
数の通信中継装置(端末制御装置)が存在し、通信中継
装置(端末制御装置)と端末装置とがバス型の通信回線
で接続されて疎結合な関係にあるので、端末制御装置(
通信中継装置)あるいは通信回線がダウンしても他の端
末制御装置を通信中継装置として切り替え使用し、端末
装置とホストコンピュータ上のAP−AP間通信を中断
なく継続させて実行する事ができるという効果かある。As explained above, the present invention includes a plurality of communication relay devices (terminal control devices) in one communication system, and the communication relay devices (terminal control devices) and the terminal devices are connected by a bus-type communication line. Since there is a loosely coupled relationship, the terminal control device (
Even if the communication relay device (communication relay device) or the communication line goes down, it is possible to switch to another terminal control device as the communication relay device and continue the AP-AP communication between the terminal device and the host computer without interruption. It's effective.
第1図は本発明の一実施例を示すシステム構成図である
。
1・・・端末装置、2.3・・・端末制御装置、4・・
・ホストコンピュータ、5・・・バス型通信回線、6.
7・・・通信回線。FIG. 1 is a system configuration diagram showing an embodiment of the present invention. 1...Terminal device, 2.3...Terminal control device, 4...
- Host computer, 5... bus type communication line, 6.
7...Communication line.
Claims (1)
よって接続された複数の端末制御装置と、前記端末制御
装置と通信回線によって接続されたホストコンピュータ
と、前記端末制御装置の通信中継機能によって端末装置
とホストコンピュータがデータ転送を行っている際に互
いの動作状況を監視する手段とを有し、現在稼働中の端
末制御装置および通信回線がダウンした事を認識すると
別の端末制御装置を切り換え使用し、ホストコンピュー
タと端末装置間の通信を支障なく継続させることを特徴
とするデータ通信方式。A plurality of terminal devices, a plurality of terminal control devices connected to the terminal devices via a bus-type communication line, a host computer connected to the terminal control device via a communication line, and a communication relay function of the terminal control device. The terminal device and the host computer have means for monitoring each other's operating status when they are transferring data, and when it is recognized that the currently operating terminal control device and communication line are down, another terminal control device is activated. A data communication method that uses switching to continue communication between a host computer and a terminal device without any hindrance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032889A JPH03235546A (en) | 1990-02-13 | 1990-02-13 | Data communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2032889A JPH03235546A (en) | 1990-02-13 | 1990-02-13 | Data communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03235546A true JPH03235546A (en) | 1991-10-21 |
Family
ID=12371450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2032889A Pending JPH03235546A (en) | 1990-02-13 | 1990-02-13 | Data communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03235546A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009237789A (en) * | 2008-03-26 | 2009-10-15 | Mizuho Information & Research Institute Inc | Data transfer system, data transfer method, and data transfer program |
JP2015052949A (en) * | 2013-09-06 | 2015-03-19 | 東芝テック株式会社 | Information processing device and program |
-
1990
- 1990-02-13 JP JP2032889A patent/JPH03235546A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009237789A (en) * | 2008-03-26 | 2009-10-15 | Mizuho Information & Research Institute Inc | Data transfer system, data transfer method, and data transfer program |
JP2015052949A (en) * | 2013-09-06 | 2015-03-19 | 東芝テック株式会社 | Information processing device and program |
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