JPH06120954A - Abnormal state restoration system for local network system - Google Patents

Abnormal state restoration system for local network system

Info

Publication number
JPH06120954A
JPH06120954A JP4263774A JP26377492A JPH06120954A JP H06120954 A JPH06120954 A JP H06120954A JP 4263774 A JP4263774 A JP 4263774A JP 26377492 A JP26377492 A JP 26377492A JP H06120954 A JPH06120954 A JP H06120954A
Authority
JP
Japan
Prior art keywords
station
token
monitoring
monitoring station
abnormal state
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
Application number
JP4263774A
Other languages
Japanese (ja)
Other versions
JP3162204B2 (en
Inventor
Yasuhisa Masuo
泰央 増尾
Masayuki Iwatsuka
昌幸 岩塚
Mamoru Kunimoto
衛 国本
Tooru Takenuki
徹 竹貫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, Matsushita Electric Works Ltd filed Critical Nippon Steel Corp
Priority to JP26377492A priority Critical patent/JP3162204B2/en
Publication of JPH06120954A publication Critical patent/JPH06120954A/en
Application granted granted Critical
Publication of JP3162204B2 publication Critical patent/JP3162204B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To shorten the restoration time of an abnormal state by judging the abnormal state by a monitoring station when no transmission of a valid frame is present from a station from which a token is received when a non- communication state from the station is continued for a fixed time and omitting the pertinent station from a network map. CONSTITUTION:At the monitoring station 11, token monitoring is performed by receiving the token to be broadcasted and the station holding the token at the present is recognized. In the fixed time corresponding to the time for transmitting the token from the recognized station to the next station, when the monitoring station 11 detects that the non-communication state is continued, it is discriminated that a network failure is generated and the token is retransmitted to the pertinent station by the monitoring station 11. Thereafter, when the valid frame is received, the monitoring station 11 considers that the delivery of the token is succeeded and returns to a token monitoring state.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ローカルネットワーク
システムの異常状態復旧方式に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal state recovery system for a local network system.

【0002】[0002]

【従来の技術】従来トークンパッシング方式のローカル
ネットワークシステムにおいて異常状態が発生した場合
の対策として、特開平2−53346号に記載されたも
のがある。この従来例では、監視局以外の通常の局に後
続局のトークン不受理を検出したときに、トークンを監
視局に返還し、監視局では、この返還されたトークンに
基づいてトークンを受理しない後続局をネットワークマ
ップから除外するとともに、返還されたトークンを、新
たな後続局へ送信するようになっている。
2. Description of the Related Art As a countermeasure against an abnormal state occurring in a conventional token passing type local network system, there is one described in JP-A-2-53346. In this conventional example, when the normal station other than the monitoring station detects the token rejection of the subsequent station, the token is returned to the monitoring station, and the monitoring station does not accept the token based on the returned token. The station is excluded from the network map, and the returned token is transmitted to a new succeeding station.

【0003】[0003]

【発明が解決しようとする課題】上記従来例によれば、
前の局で後続局を監視し、後続局が異常であれば、前の
局からトークンを監視局に送信し、このトークンの返還
により監視局ではネットワークマップから異常局を外
し、更に監視局から新たな後続局へ送信するというステ
ップを踏むため、監視局での異常状態の復旧処理が遅く
なるという問題がある。
According to the above conventional example,
The previous station monitors the subsequent station, and if the subsequent station is abnormal, the previous station sends a token to the monitoring station, and the return of this token causes the monitoring station to remove the abnormal station from the network map, and then from the monitoring station. Since the step of transmitting to a new succeeding station is taken, there is a problem that the recovery processing of the abnormal state in the monitoring station becomes slow.

【0004】本発明は、上述の問題点に鑑みて為された
もので、その目的とするところは異常状態発生時の復旧
時間を短縮することができるローカルネットワークシス
テムの異常状態復旧方式を提供するにある。
The present invention has been made in view of the above problems, and an object thereof is to provide an abnormal state recovery method for a local network system capable of shortening the recovery time when an abnormal state occurs. It is in.

【0005】[0005]

【課題を解決するための手段】上述の目的を達成するた
めに、請求項1の発明は、トークンパッシング方式によ
り伝送制御されるローカルネットワークシステムにおい
て、いずれかの局の一つを監視局とし、この監視局では
各局のトークン送信を常時監視して、トークンを受信し
た局から一定時間、無通信状態が継続したことを検出し
たとき当該局にトークンを再送し、この再送に対応した
当該局からの有効フレームの送信がなければ監視局では
異常状態と判定してネットワークマップより当該局を削
除し、有効フレームの送信が当該局からあればトークン
の常時監視状態に戻ることを特徴とする。
In order to achieve the above-mentioned object, the invention of claim 1 is a local network system in which transmission is controlled by a token passing system, wherein one of the stations is a monitoring station, This monitoring station constantly monitors the token transmission of each station, retransmits the token to the station when it detects that the station that received the token has been in a non-communication state for a certain period of time, and the station corresponding to this retransmission If the valid frame is not transmitted, the monitoring station determines that it is in an abnormal state, deletes the station from the network map, and if the valid frame is transmitted from the station, returns to the constant monitoring state of the token.

【0006】請求項2の発明は、ブロードキャスト伝送
によるトークンを監視局で常時監視することを特徴とす
る。請求項3の発明は、送信される全フレームを監視局
で受信してフレーム中のトークンを監視することを特徴
とする。請求項4の発明は、監視局を除いた局では、無
通信状態の時間が一定時間以上継続した場合、自局のア
ドレスに一定時間を乗じた時間経過後に監視局となって
次の局のトークンを送信することを特徴とする。
The invention of claim 2 is characterized in that the token transmitted by broadcast is constantly monitored by the monitoring station. The invention of claim 3 is characterized in that all the transmitted frames are received by a monitoring station and the tokens in the frames are monitored. According to the invention of claim 4, in the stations excluding the monitoring station, if the time of the non-communication state continues for a certain time or more, the station becomes the monitoring station after the time obtained by multiplying the address of the own station by the certain time and becomes the next station. Characterized by transmitting a token.

【0007】[0007]

【作用】請求項1の発明によれば、監視局が、トークン
送信を常時監視しているため、異常検出から異常状態の
局の削除までの処理に要するまでの時間が短くなり、異
常状態の復旧時間を短縮できるのである。監視局がトー
クンをブロードキャスト伝送する請求項2の発明又は送
信される全フレームを監視局で受信してフレーム中のト
ークンを監視する請求項3の発明によれば監視局でトー
クンを常時監視することができる。
According to the invention of claim 1, since the monitoring station constantly monitors the token transmission, the time required for processing from the detection of an abnormality to the deletion of the station in the abnormal state is shortened, and The recovery time can be shortened. According to the invention of claim 2 in which the monitoring station broadcast-transmits the token or the monitoring station receives all the frames to be transmitted and monitors the token in the frame, the monitoring station constantly monitors the token. You can

【0008】また請求項4の発明によれば、監視局を除
いた局では、無通信状態の時間が一定時間以上継続した
場合、自局のアドレスに一定時間を乗じた時間経過後に
監視局となって次の局のトークンを送信するため、監視
局自体が異常状態となっても、短時間で監視局を除いた
他の局が自動的に次の監視局になるため、予備の監視局
等を設けることなく、監視局の異常発生時においても短
時間に復旧させることができる。
Further, according to the invention of claim 4, in the stations excluding the monitoring station, when the non-communication state continues for a certain time or more, the station becomes the monitoring station after the time obtained by multiplying the address of the own station by the certain time. Since the next station's token is transmitted, even if the monitoring station itself becomes abnormal, other stations except the monitoring station automatically become the next monitoring station in a short time. Even when an abnormality occurs in the monitoring station, it is possible to recover in a short time without providing the above.

【0009】[0009]

【実施例】以下本発明を実施例により説明する。 (実施例1)図2は本実施例を採用するネットワークシ
ステムの構成を示しており、各局1 1 …1nは伝送路2
を介して接続されて、各種フレームの送受信が行われる
ようになっており、その局の内の一つを監視局(例えば
1 )とし、他の局と区別する。
EXAMPLES The present invention will be described below with reference to examples. (Embodiment 1) FIG. 2 is a network system adopting this embodiment.
Shows the configuration of the stem, each station 1 1... 1n is transmission line 2
Connected via and send / receive various frames.
One of the stations is a monitoring station (eg
11) And distinguish it from other stations.

【0010】而してネットワークシステムに接続された
監視局を含めた各局11 …1nはトークンフレームを受
信すると、データ送信を行ない、データ送信が終了する
と、次の局のアドレスを宛て先アドレスに設定したトー
クンフレームを送信した後、次のトークンフレームの受
信のための状態に移行するようなっており、ネットワー
ク障害が発生しない限り、トークンが巡回することにな
る。
When each station 1 1 ... 1n including the monitoring station connected to the network system receives the token frame, it transmits data, and when the data transmission is completed, the address of the next station becomes the destination address. After transmitting the set token frame, the state shifts to the state for receiving the next token frame, and the token circulates unless a network failure occurs.

【0011】本実施例では、ネットワークマップを含め
たトークンフレームをブロードキャスト伝送するように
なっており、図3は実施例で使用するトークンフレーム
の構成を示す。図3において、同期用フラグF、ブロー
ドキャストアドレスであるFFFF(H ) を書き込む2バ
イトのADDR、トークンを示すコード66(H) を書き
込んだ種別コードCTL、更に送信元局のアドレスを書
き込むSID、送信先局のアドレスを書き込むDID、
ネットワークマップのデータを書き込むMAP(この場
合8バイトのデータからなり、最大局数が64局で各ビ
ットが一局に対応し、加入局の場合対応するビットがオ
ンする)、更に2バイトのエラチェック用データCR
C、同期用フラグFから構成され、ブロードキャスト伝
送されるこのトークンフレームにネットワークマップを
含めることにより、各局11 …が自局内に保持するネッ
トワークマップを常に更新することができるようになっ
ている。またトークンをブロードキャスト伝送すること
により監視局11 でトークンを常時監視することがで
き、その結果監視局11 により現在トークンを保持して
いる局を把握することができるのである。
In this embodiment, a token frame including a network map is broadcast-transmitted, and FIG. 3 shows the structure of the token frame used in this embodiment. 3, the synchronous flag F, a 2-byte for writing FFFF (H) is a broadcast address ADDR, type code CTL writing the code 66 (H) showing the token, SID further writes the address of the source station, transmission DID to write the address of the destination station,
MAP for writing network map data (in this case, it consists of 8 bytes of data, the maximum number of stations is 64 stations, each bit corresponds to one station, and the corresponding bit turns on in case of a subscriber station), and further 2 bytes error Check data CR
By including a network map in this token frame which is composed of C and a synchronization flag F and is broadcast and transmitted, each station 1 1 ... Can update the network map held in its own station at all times. Further, by broadcasting the token, the monitoring station 1 1 can constantly monitor the token, and as a result, the monitoring station 1 1 can know the station that currently holds the token.

【0012】図1は、監視局11 の動作のフローチャー
トを示しており、監視局11 ではトークン監視を上述の
ようにブロードキャストされるトークンを受信すること
によりトークン監視を行ない、現在トークンを保持して
いる局を把握する。この把握されている局から、次の局
にトークンを送信するまでの間に対応する一定時間にお
いて、無通信状態が継続したことを監視局11 が検出す
ると、ネットワーク障害が発生したと判断して、監視局
1 では当該局に対してトークンを再送する。このあと
監視局11 は有効フレームが一定時間の間に受信される
かどうかを監視し、有効フレームの受信があると、トー
クンの受渡しが成功したと見なして、トークンの監視状
態に戻る。もし有効フレームが一定時間の間に受信され
ないときには、当該局をネットワークマップから削除
し、この削除したネットワークマップを含めたトークン
フレームを次の局へ送信し、異常状態を復旧するのであ
る。
[0012] Figure 1 shows a flowchart of the operation of the monitoring station 1 1 performs token monitoring by receiving a token is broadcast monitoring station 1 1 Token monitoring as described above, holds the current token Understand which stations are doing. From station to which this is understood, in certain time corresponding to those before sending the token to the next station, if that no communication state continues monitoring station 1 1 detects, determines that the network failure Te, retransmits the token for monitoring station 1 1 in the station. After that, the monitoring station 1 1 monitors whether or not a valid frame is received within a certain time, and when the valid frame is received, it is considered that the token has been successfully delivered, and the state returns to the token monitoring state. If the valid frame is not received within a certain time, the station is deleted from the network map, the token frame including the deleted network map is transmitted to the next station, and the abnormal state is recovered.

【0013】尚無通信状態の発生は、各局11 …の通信
制御用のハードウェアで検出することができる。従っ
て、監視局11 自体の異常発生時には次のような復旧処
理がなされる。図4はこの監視局11 自体の異常発生時
の他の局12 …の動作のフローチャートを示している。
而して監視局11 の障害が原因で無通信状態が発生した
場合には、監視局11 によるトークンの再送が行われな
いため、無通信状態が継続する。監視局11 を除いた他
の局12 …では無通信状態が一定時間継続した場合、自
局のアドレスに一定時間を乗じた時間が経過した後、自
局以外の局が送信していなければ、自局が監視局とな
る。この新規に監視局となった局は障害が発生する前の
ネットワークマップを基に次の局にトークンフレームを
送信する。
[0013] The occurrence of Naomu communication state can be detected in each station 1 1 ... of hardware for communication control. Therefore, the recovery, the following process is performed at the time of occurrence of abnormality in the monitoring station 1 1 itself. FIG. 4 shows a flowchart of the operation of the other stations 1 2 ... When an abnormality occurs in the monitoring station 1 1 itself.
When Thus to non-communication state failure monitoring station 1 1 Causes occurs, because the retransmission of the token by the monitoring station 1 1 is not performed, no communication state continues. If other stations 1 2 ... In the non-communication status, except for the monitoring station 1 1 has continued for a certain time, after a time obtained by multiplying a predetermined time to the address of the own station has elapsed, it is not a station other than the own station transmits For example, your own station becomes the monitoring station. The station that has newly become the monitoring station transmits a token frame to the next station based on the network map before the failure.

【0014】そしてトークンが前監視局(障害発生局)
に渡って、無通信状態が発生すると、上述の図1に示す
フローチャートによる監視局の動作を行って、異常状態
の復旧処理を行うのである。 (実施例2)上記実施例方式はトークンをブロードキャ
スト伝送して、トークンを監視局で常時監視する方式で
あったが、本実施例では監視局がネットワークで伝送さ
れる全フレームを受信して、トークンを常時監視するよ
うになっている。
Then, the token is the front monitoring station (fault occurrence station)
When the non-communication state occurs, the operation of the monitoring station according to the flowchart shown in FIG. 1 described above is performed to perform the recovery processing of the abnormal state. (Embodiment 2) In the embodiment described above, the token is broadcasted and the token is constantly monitored by the monitoring station. However, in this embodiment, the monitoring station receives all frames transmitted by the network, It is designed to constantly monitor tokens.

【0015】図5は本実施例におけるフレームの構成を
示しており、この構成では同期用フラグF、受信局のア
ドレスDID、フレームの種別コードCTL、送信局の
アドレスSID、データ、エラーチェック用データCR
C、同期用フラグFから構成されており、監視局、例え
ば11 は図6に示すように伝送される全フレームを受信
して、受信データがトークンであるのかどうかをフレー
ムの種別コードCTLが66(H) であるのかどうかを判
定して66(H) のトークンであれば、送受信局のアドレ
スを記憶して現在トークンを保持している局を把握す
る。
FIG. 5 shows the structure of the frame in this embodiment. In this structure, the synchronization flag F, the address DID of the receiving station, the frame type code CTL, the address SID of the transmitting station, the data, and the error checking data are used. CR
C, is composed of a synchronous flag F, the monitoring station, for example, 1 1 receives the entire frame to be transmitted as shown in FIG. 6, the received data is a type code CTL frame whether the a token If the token is 66 (H) and it is a 66 (H) token, the address of the transmitting / receiving station is stored and the station currently holding the token is grasped.

【0016】この後、図1に示すフローチャートと同様
の処理を行うのである。尚監視局の障害発生時の処理は
実施例1と同様に行われる。
After that, the same processing as the flowchart shown in FIG. 1 is performed. The processing when a failure occurs in the monitoring station is performed in the same manner as in the first embodiment.

【0017】[0017]

【発明の効果】請求項1の発明は、トークンパッシング
方式により伝送制御されるローカルネットワークシステ
ムにおいて、いずれかの局の一つを監視局とし、この監
視局では各局のトークン送信を常時監視して、トークン
を受信した局から一定時間、無通信状態が継続したこと
を検出したとき当該局にトークンを再送し、この再送に
対応した当該局からの有効フレームの送信がなければ監
視局では異常状態と判定してネットワークマップより当
該局を削除し、有効フレームの送信が当該局からあれば
トークンの常時監視状態に戻るものであって、監視局
が、トークン送信を常時監視しているため、異常検出か
ら異常状態の局の削除までの処理に要する時間が短くな
り、異常状態の復旧時間を短縮できるという効果があ
る。
According to the invention of claim 1, in a local network system in which transmission is controlled by the token passing system, one of the stations is used as a monitoring station, and this monitoring station constantly monitors the token transmission of each station. , When the station that received the token detects that the non-communication state has continued for a certain period of time, the token is retransmitted to the station, and if there is no valid frame transmission from the station corresponding to this retransmission, the monitoring station is in an abnormal state. It is determined that the station is deleted from the network map, and if the valid frame is sent from the station, the token returns to the constant monitoring state, and the monitoring station constantly monitors the token transmission. The time required for processing from detection to the deletion of the station in the abnormal state is shortened, and the recovery time of the abnormal state can be shortened.

【0018】また請求項4の発明は、監視局を除いた局
では、無通信状態の時間が一定時間以上継続した場合、
自局のアドレスに一定時間を乗じた時間経過後に監視局
となって次の局のトークンを送信するため、監視局自体
が異常状態となっても、短時間で監視局を除いた他の局
が自動的に次の監視局になるため、予備の監視局等を設
けることなく、監視局の異常発生時においても短時間に
復旧させることができるという効果がある。
According to the invention of claim 4, in the stations excluding the monitoring station, when the time of the non-communication state continues for a certain time or more,
Since the station becomes the monitoring station and sends the token of the next station after the time obtained by multiplying the address of its own station by a certain time, even if the monitoring station itself is in an abnormal state, other stations except the monitoring station in a short time Since it automatically becomes the next monitoring station, there is an effect that it is possible to recover in a short time even when an abnormality occurs in the monitoring station without providing a backup monitoring station or the like.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例1の監視局の動作説明用フロー
チャートである。
FIG. 1 is a flowchart for explaining an operation of a monitoring station according to a first embodiment of the present invention.

【図2】同上に用いるネットワークシステムの構成図で
ある。
FIG. 2 is a configuration diagram of a network system used in the above.

【図3】同上に用いるトークンフレームの構成図であ
る。
FIG. 3 is a configuration diagram of a token frame used in the above.

【図4】同上の他の局の動作説明用フローチャートであ
る。
FIG. 4 is a flowchart for explaining the operation of another station in the above.

【図5】本発明の実施例2に用いるフレームの構成図で
ある。
FIG. 5 is a configuration diagram of a frame used in Example 2 of the present invention.

【図6】同上の監視局の動作説明用フローチャートであ
る。
FIG. 6 is a flowchart for explaining the operation of the above monitoring station.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 国本 衛 東京都千代田区大手町2丁目6番3号 新 日本製鐵株式会社内 (72)発明者 竹貫 徹 東京都千代田区大手町2丁目6番3号 新 日本製鐵株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mamoru Kunimoto 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Toru Takenuki 2-6, Otemachi, Chiyoda-ku, Tokyo No. 3 within Nippon Steel Corporation

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】トークンパッシング方式により伝送制御さ
れるローカルネットワークシステムにおいて、いずれか
の局の一つを監視局とし、この監視局では各局のトーク
ン送信を常時監視して、トークンを受信した局から一定
時間、無通信状態が継続したことを検出したとき当該局
にトークンを再送し、この再送に対応した当該局からの
有効フレームの送信がなければ監視局では異常状態と判
定してネットワークマップより当該局を削除し、有効フ
レームの送信が当該局からあればトークンの常時監視状
態に戻ることを特徴とするローカルネットワークシステ
ムの異常状態復旧方式。
1. In a local network system in which transmission is controlled by a token passing system, one of any stations is used as a monitoring station, and this monitoring station constantly monitors the token transmission of each station, When a non-communication state is detected for a certain period of time, the token is retransmitted to the station, and if there is no transmission of a valid frame from the station corresponding to this re-transmission, the monitoring station judges that it is in an abnormal state Abnormal state recovery method for the local network system, which deletes the station and returns to the constant monitoring state of the token if a valid frame is transmitted from the station.
【請求項2】ブロードキャスト伝送によるトークンを監
視局で常時監視することを特徴とする請求項1記載のロ
ーカルネットワークシステムの異常状態復旧方式。
2. The abnormal state recovery system for a local network system according to claim 1, wherein a token transmitted by broadcast is constantly monitored by a monitoring station.
【請求項3】送信される全フレームを監視局で受信して
フレーム中のトークンを監視することを特徴とする請求
項1記載のローカルネットワークシステムの異常状態復
旧方式。
3. The abnormal state recovery system for a local network system according to claim 1, wherein a monitoring station receives all transmitted frames and monitors the tokens in the frames.
【請求項4】監視局を除いた局では、無通信状態の時間
が一定時間以上継続した場合、自局のアドレスに一定時
間を乗じた時間経過後に監視局となって次の局のトーク
ンを送信することを特徴とする請求項1記載のローカル
ネットワークシステムの異常状態復旧方式。
4. A station other than the monitoring station becomes a monitoring station after the elapse of a time obtained by multiplying the address of its own station by a certain time, when the non-communication time continues for a certain time or longer, and becomes a token of the next station. The method for recovering an abnormal state of a local network system according to claim 1, wherein the method is transmitted.
JP26377492A 1992-10-01 1992-10-01 Error recovery method for local network system Expired - Lifetime JP3162204B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26377492A JP3162204B2 (en) 1992-10-01 1992-10-01 Error recovery method for local network system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26377492A JP3162204B2 (en) 1992-10-01 1992-10-01 Error recovery method for local network system

Publications (2)

Publication Number Publication Date
JPH06120954A true JPH06120954A (en) 1994-04-28
JP3162204B2 JP3162204B2 (en) 2001-04-25

Family

ID=17394101

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26377492A Expired - Lifetime JP3162204B2 (en) 1992-10-01 1992-10-01 Error recovery method for local network system

Country Status (1)

Country Link
JP (1) JP3162204B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010187244A (en) * 2009-02-13 2010-08-26 Meidensha Corp System for detecting/recovering token abnormality between terminal apparatuses

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102469910B1 (en) * 2020-09-17 2022-11-23 진지현 Portable hanger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010187244A (en) * 2009-02-13 2010-08-26 Meidensha Corp System for detecting/recovering token abnormality between terminal apparatuses

Also Published As

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JP3162204B2 (en) 2001-04-25

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