JPH0748738B2 - Communication error detection device - Google Patents
Communication error detection deviceInfo
- Publication number
- JPH0748738B2 JPH0748738B2 JP63224230A JP22423088A JPH0748738B2 JP H0748738 B2 JPH0748738 B2 JP H0748738B2 JP 63224230 A JP63224230 A JP 63224230A JP 22423088 A JP22423088 A JP 22423088A JP H0748738 B2 JPH0748738 B2 JP H0748738B2
- Authority
- JP
- Japan
- Prior art keywords
- communication
- communication terminal
- terminal devices
- signal
- transmission
- 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 - Fee Related
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は伝送通信路に接続された複数の通信端末機器間
の通信異常を発見する通信異常検出装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication error detection device for detecting a communication error between a plurality of communication terminal devices connected to a transmission communication path.
従来の技術 近年、複数の通信端末機器を集中的に制御したり、各通
信端末機器の状態をモニタすることを目的として、各通
信端末機器を伝送通信路で結び、互いに信号を伝送し合
う伝送制御システムが各種報告されている。これらは主
に、通信方式としてCSMA/CD方式を採用しているが、こ
の方式はすべての通信端末機器間で正常に信号の送受信
が行なわなければシステム全体が正常に動作しないとい
う通信方式である。たとえば、A,B,Cという３つの通信
端末機器があり、ＡとB,及びＢとＣとは互いに信号の送
受信が正常であったが、ＡとＣはＡが送信する信号をＣ
が、また反対にＣが送信する信号をＡが受信できなかっ
たとする。この場合においてＡとＣに同時に信号の送信
要求が生じ、その信号に含まれる情報がＢに必要なもの
であっても、ＡとＣで衝突検出（CD）が行なわれないた
め、ＢにはＡとＣの信号が混ざった状態で受信され、正
常に情報が到達しないばかりでなく、最悪の場合には誤
った情報が受信されることもある。またＡとＣに少し時
間的にずれて送信要求が生じた場合にも、伝送通信路が
未使用であることを確認してから送信を開始すること
（CSMA）が正常に行なわれないため、やはり信号の途中
からＡとＣの信号が混ざった状態となり前記したものと
同様の問題が生じる。したがって、システム施工時に
は、すべての通信端末機器の組み合せにおいて、送受信
が正常に行なわれているかを検査する必要があり、従来
はその作業を手作業により行なっていた。2. Description of the Related Art In recent years, for the purpose of centrally controlling a plurality of communication terminal devices and monitoring the state of each communication terminal device, each communication terminal device is connected by a transmission communication path and signals are transmitted to each other. Various control systems have been reported. These mainly use the CSMA / CD method as a communication method, but this method is a communication method in which the entire system does not operate normally unless signals are normally transmitted and received between all communication terminal devices. . For example, there are three communication terminal devices, A, B, and C, and A and B, and B and C are normally transmitting and receiving signals, but A and C are C
On the contrary, it is assumed that A cannot receive the signal transmitted by C. In this case, A and C are requested to transmit signals at the same time, and even if the information contained in the signals is necessary for B, collision detection (CD) is not performed between A and C, so Not only the information does not arrive normally when the signals of A and C are mixed, but in the worst case, erroneous information may be received. Also, when a transmission request is generated with a slight time lag between A and C, it is not possible to normally start transmission (CSMA) after confirming that the transmission communication path is unused. After all, the signals of A and C are mixed from the middle of the signal, and the same problem as described above occurs. Therefore, at the time of system construction, it is necessary to inspect whether or not transmission / reception is normally performed in all combinations of communication terminal devices, and conventionally, the work is manually performed.
発明が解決しようとする課題 しかしながら、通信端末機器の数が多くなると手作業に
よる動作チェックには限界があり、たとえば百台の通信
端末機器があるシステムにおいては100C2＝4950通りも
の組合せにおいて、その動作チェックを行なう必要があ
るため、すべてのチェックは不可能なのが現状であっ
た。However, when the number of communication terminal devices is large, there is a limit to the operation check by hand, and for example, in a system with 100 communication terminal devices, 100 C 2 = 4950 combinations, Since it is necessary to check the operation, all the checks are impossible at present.
本発明は前記問題点を解決するもので、すべての通信端
末機器の組合せにおいて、送受信が正常に行なわれてい
ないものがあることを自動的に検出する通信異常検出装
置を提供することを目的としている。The present invention solves the above problems, and an object thereof is to provide a communication abnormality detection device that automatically detects that transmission / reception is not normally performed in all combinations of communication terminal devices. There is.
課題を解決するための手段 本発明の通信異常検出装置は前記課題を解決するため
に、CSMA/CD方式通信を行なう複数の通信端末機器と、
前記複数の通信末端機器へ一斉に信号の送信を指示する
一斉同報信号の送出を行なう送信手段と、前記複数の通
信端末機器の送信する信号を受信する受信手段と、前記
一斉同報信号送出後、前記受信手段の出力により正常に
信号を受信した通信端末機器数をカウントする計数手段
とより成る通信異常検出機器と、これら複数の通信端末
機器、及び通信異常検出機器が送受信する信号の伝送路
である伝送通信路とから構成されている。Means for Solving the Problems In order to solve the above problems, the communication abnormality detection device of the present invention includes a plurality of communication terminal devices that perform CSMA / CD communication.
Transmitting means for transmitting a broadcast signal for instructing simultaneous transmission of signals to the plurality of communication end devices, receiving means for receiving signals transmitted by the plurality of communication terminal devices, and transmitting the broadcast signal After that, a communication abnormality detecting device including a counting device that counts the number of communication terminal devices that have received a signal normally by the output of the receiving device, and transmission of signals transmitted and received by the plurality of communication terminal devices and the communication abnormality detecting device. And a transmission communication path which is a path.
作用 本発明は前記した構成により、通信異常検出機器が送信
手段により一斉同報信号を伝送通信路に送出すると、こ
の一斉同報信号を受信した通信端末機器が同時に信号の
送出を開始し、この際全通信端末機器まで互いの信号が
受信できないものがあれば、それらは前記したように互
いの信号が混ざった状態で通信異常検出機器の受信手段
で受信され、その結果正常に信号を受信した通信端末機
器の計数手段によるカウント数が、実際に伝送通信路上
に存在する通信端末機器より少なくなることより、通信
異常の発見が非常に容易に行なえることとなる。According to the present invention, with the above-described configuration, when the communication abnormality detecting device sends the broadcast signal to the transmission communication path by the transmitting means, the communication terminal device which receives the broadcast signal simultaneously starts sending the signal. At this time, if there are signals that cannot receive each other's signals up to all communication terminal devices, they are received by the receiving means of the communication abnormality detection device in a state where the signals of each other are mixed as described above, and as a result, the signals are normally received. Since the number counted by the counting means of the communication terminal equipment is smaller than that of the communication terminal equipment actually existing on the transmission communication path, it becomes possible to detect the communication abnormality very easily.
実施例 以下本発明の一実施例について、図面を参照しながら説
明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例における通信異常検出装置の
構成図を示すものである。第１図において１は信号の伝
送路である電灯線、2,3,4はCSMA/CD方式通信を行なう通
信端末機器、5,6,7は通信端末機器２〜４の識別番号で
ある自局アドレスを設定するための自局アドレス設定ス
イッチであり、各通信端末機器で異なった値をとり、通
信端末機器が信号を送信する際はこのスイッチで設定さ
れた値を信号内に含めて送信することにより、どの通信
端末機器が送信した信号であるのかが識別可能となる。
８は通信端末機器へ一斉に信号の送信を指示する一斉同
報信号の送出を行なう送信手段、９は通信端末機器が送
信する信号を電灯線１を介して受信する受信手段、10は
送信手段８が一斉同報信号送出後、受信手段９の出力に
より正常に信号を受信した端末機器数をカウントする計
数手段、11は計数手段10の計数値を表示する計数値表示
手段、12は受信手段９により受信した通信端末機器の自
局アドレスを表示する受信アドレス表示手段、13は前記
８〜12の手段から成る通信異常検出機器である。FIG. 1 is a block diagram of a communication abnormality detecting device in an embodiment of the present invention. In FIG. 1, 1 is a power line which is a signal transmission path, 2, 3 and 4 are communication terminal devices that perform CSMA / CD communication, and 5, 6 and 7 are identification numbers of the communication terminal devices 2 to 4. This is a local address setting switch for setting the station address.Each communication terminal device takes a different value, and when the communication terminal device sends a signal, the value set by this switch is included in the signal and sent. By doing so, it becomes possible to identify which communication terminal device transmitted the signal.
Reference numeral 8 is a transmitting means for sending out a broadcast signal for instructing simultaneous transmission of signals to the communication terminal equipment, 9 is receiving means for receiving a signal transmitted by the communication terminal equipment via the power line 1, and 10 is transmitting means. 8 is a counting means for counting the number of terminal devices which have normally received the signal by the output of the receiving means 9 after sending the broadcast signal, 11 is a count value displaying means for displaying the count value of the counting means 10, and 12 is a receiving means. Reception address display means for displaying the own station address of the communication terminal equipment received by 9 and 13 is a communication abnormality detection equipment comprising the means of 8 to 12.
以上のように構成された通信異常検出装置について、以
下その動作について説明する。The operation of the communication abnormality detection device configured as described above will be described below.
まず、通信異常機器13が送信手段８により一斉同報信号
を電灯線１上へ送出したとする。これを電灯線１を介し
て受信した通信端末機器２〜４は一斉同報信号に対する
応答の信号を電灯線１上へ同時に送信する。この際通信
端末機器２〜４の間で送受信が正常である場合は、つま
り各通信端末機器において他の通信端末機器の送信信号
を正常に受信できる場合は衝突検出（CD）が、信号に含
まれる各通信端末機器で互いに異なる自局アドレスの部
分等で行なわれ、通信端末機器２〜４の送信信号はすべ
て正常に電灯線１上に送出されることになる。したがっ
て通信異常検出機器13は受信手段９によりそれらの信号
を受信し、そして計数手段10は通信端末機器数が３台で
あることを計数し、その結果、計数値表示手段には３と
いう値が表示されることになる。また受信アドレス表示
手段12には、受信手段９により信号が正常に受信される
ごとに、その中に含まれる自局アドレスが表示されるこ
とになる。First, it is assumed that the abnormal communication device 13 sends a simultaneous broadcast signal to the power line 1 by the transmitting means 8. The communication terminal devices 2 to 4 which have received this via the power line 1 simultaneously transmit a signal of a response to the broadcast signal onto the power line 1. At this time, if transmission / reception is normal between the communication terminal devices 2 to 4, that is, if each communication terminal device can normally receive the transmission signal of the other communication terminal device, collision detection (CD) is included in the signal. Each of the communication terminal devices to be used is carried out at a portion of its own station address different from each other, etc., and all transmission signals of the communication terminal devices 2 to 4 are normally transmitted to the power line 1. Therefore, the communication abnormality detecting device 13 receives those signals by the receiving means 9, and the counting means 10 counts that the number of communication terminal devices is 3, and as a result, the count value display means shows a value of 3. Will be displayed. In addition, the reception address display means 12 displays the address of its own station contained therein each time the signal is normally received by the reception means 9.
また、なんらかの理由により、通信端末機器２と通信端
末機器４が互いに送信する信号を受信できない場合は、
通信異常検出機器13が送信手段８により、一斉同報信号
を電灯線１上へ送出しても、通信端末機器３の送信信号
しか電灯線１上へは正常に送出されないことになる。こ
の理由を第２図を用いてより詳しく説明する。第２図に
おいて、14は電灯線１上の交流電圧波形を示している。
Ａはデータ“1"とデータ“0"のビット列を示し、データ
“1"は交流電圧波形のピークの前半に、データ“0"は交
流電圧波形のピークの後半に高周波信号を重畳して構成
されており、通信端末機器の送信信号はこのデータ
“1",データ“0"が複数ビット連結された構成となって
いる。Ｂは同様な定義により、データ“0"とデータ“1"
のビット列を示している。いまＡのデータを通信端末機
器２が、Ｂのデータを通信端末機器４が送出したとすれ
ば、各々互いの送信信号が受信できないため衝突検出が
動作せず、結局電灯線１にはＣの様な信号が送出された
ことになり、この信号を受信した他のものには、データ
が“1"なのか“0"なのか判別できないことになる。した
がって前記したように、通信異常検出機器13が送信手段
８により一斉同報信号を電灯線１上へ送出しても、通信
端末機器３の送信信号しか電灯線１上へは正常に送信さ
れないことになり、その結果通信異常検出機器13は、受
信手段９によりその信号を受信し、そして計数手段10は
通信端末機器数が１台であると認識し、計数値が計数値
表示手段に１と表示されるため、この表示結果が実際の
通信端末機器数より少ないことより、即座に通信異常が
検出できることになる。またこの際、受信アドレス表示
手段12には通信端末機器３の自局アドレス、つまり自局
アドレス設定スイッチ６の値のみしか表示されないた
め、通信端末機器2,4に通信異常があることも即座に判
ることになる。Further, if for some reason the communication terminal device 2 and the communication terminal device 4 cannot receive the signals transmitted to each other,
Even if the communication abnormality detecting device 13 sends the simultaneous broadcast signal to the power line 1 by the transmitting means 8, only the transmission signal of the communication terminal device 3 is normally sent to the power line 1. The reason for this will be described in more detail with reference to FIG. In FIG. 2, reference numeral 14 indicates an AC voltage waveform on the power line 1.
A indicates a bit string of data "1" and data "0". Data "1" is formed by superimposing a high frequency signal on the first half of the peak of the AC voltage waveform and data "0" is superimposed on the second half of the peak of the AC voltage waveform. The transmission signal of the communication terminal device has a configuration in which a plurality of bits of this data “1” and data “0” are concatenated. B has the same definition as data "0" and data "1"
Shows the bit string of If the communication terminal device 2 sends the data of A and the communication terminal device 4 sends the data of B, the collision detection does not operate because the mutual transmission signals cannot be received. This means that such a signal has been sent, and it is impossible to determine whether the data is "1" or "0" to the other who received this signal. Therefore, as described above, even if the communication abnormality detecting device 13 sends the broadcast signal to the power line 1 by the transmitting means 8, only the transmission signal of the communication terminal device 3 is normally transmitted to the power line 1. As a result, the communication abnormality detecting device 13 receives the signal by the receiving means 9, and the counting means 10 recognizes that the number of communication terminal devices is one, and the count value is 1 in the count value display means. Since it is displayed, this display result is smaller than the actual number of communication terminal devices, so that the communication abnormality can be immediately detected. Further, at this time, since only the own station address of the communication terminal device 3, that is, the value of the own station address setting switch 6 is displayed on the reception address display means 12, immediately there is a communication abnormality in the communication terminal devices 2 and 4. You will understand.
以上のように本実施例によれば、通信端末機器間で通信
異常があるかないかを、実際の通信端末機器数と計数値
表示手段で表示された通信端末機器数とを比較すること
により即座に判断でき、かつ通信異常があった場合に
は、どの通信端末機器に異常があったかも、受信アドレ
ス表示手段により判ることになる。As described above, according to the present embodiment, whether or not there is a communication abnormality between the communication terminal devices is immediately determined by comparing the actual number of communication terminal devices with the number of communication terminal devices displayed by the count value display means. If there is a communication abnormality, the reception address display means can also determine which communication terminal device has the abnormality.
なお本実施例では通信端末機器数を３台としたが、この
数は多いほど本発明の効果が顕著に表われる。また伝送
通信路を電灯線としたが、これはたの伝送通信路、たと
えば、同軸ケーブル，通信専用線を用いるものでも本発
明の主旨には影響しない。Although the number of communication terminal devices is three in this embodiment, the larger the number, the more remarkable the effect of the present invention. Although the transmission communication path is an electric power line, this does not affect the gist of the present invention even if another transmission communication path such as a coaxial cable or a communication dedicated line is used.
発明の効果 以上のように本発明は、CSMA/CD方式を行なう複数の通
信端末機器と、前記複数の通信端末機器へ一斉に信号の
送信を指示する一斉同報信号の送出を行なう送信手段
と、前記複数の通信端末機器の送信する信号を受信する
受信手段と、前記一斉同報信号送出後、前記受信手段の
出力により正常に信号を受信した通信端末機器数をカウ
ントする計数手段とより成る通信異常検出機器と、これ
ら複数の通信端末機器、及び通信異常検出機器が送受信
する信号の伝送路である伝送通信路とから構成すること
により、すべての通信端末機器へ同時に信号送信を促す
ことにより、通信端末機器のすべての組合せにおいて、
互いに送信する信号が正常に受信できるかを判断でき、
かつ、その判断が実際の通信端末機器数と計数手段の値
を比較することだけで、きわめて容易に実施することが
できるという効果を有している。EFFECTS OF THE INVENTION As described above, the present invention includes a plurality of communication terminal devices that perform the CSMA / CD method, and a transmitting unit that transmits a broadcast signal that instructs the plurality of communication terminal devices to transmit signals simultaneously. A receiving means for receiving the signals transmitted from the plurality of communication terminal devices, and a counting means for counting the number of communication terminal devices that have normally received the signals by the output of the receiving means after transmitting the broadcast signal. By composing a communication error detection device, a plurality of these communication terminal devices, and a transmission communication path that is a transmission path for signals sent and received by the communication error detection device, by prompting signal transmission to all communication terminal devices at the same time , In all combinations of communication terminal equipment,
You can judge whether the signals sent to each other can be received normally,
Moreover, there is an effect that the judgment can be carried out extremely easily only by comparing the actual number of communication terminal devices with the value of the counting means.
第１図は本発明の一実施例における通信異常検出装置の
構成図、第２図は本発明の一実施例における通信信号波
形図である。 １……電灯線、２〜４……通信端末機器、８……送信手
段、９……受信手段、10……計数手段、13……通信異常
検出機器。FIG. 1 is a block diagram of a communication abnormality detecting device in one embodiment of the present invention, and FIG. 2 is a communication signal waveform diagram in one embodiment of the present invention. 1 ... Light line, 2-4 ... communication terminal equipment, 8 ... sending means, 9 ... reception means, 10 ... counting means, 13 ... communication abnormality detection equipment.
Claims (1)
機器と、前記複数の通信端末機器へ一斉に信号の送信を
指示する一斉同報信号の送出を行なう送信手段と、前記
複数の通信端末機器の送信する信号を受信する受信手段
と、前記一斉同報信号送出後、前記受信手段の出力によ
り正常に信号を受信した通信端末機器数をカウントする
計数手段とより成る通信異常検出機器と、これら複数の
通信端末機器、及び通信異常検出機器が送受信する信号
の伝送路である伝送通信路とから構成された通信異常検
出装置。1. A plurality of communication terminal devices for performing CSMA / CD communication, transmitting means for transmitting a broadcast signal for instructing simultaneous signal transmission to the plurality of communication terminal devices, and the plurality of communication devices. A communication abnormality detecting device comprising: receiving means for receiving a signal transmitted from a terminal device; and counting means for counting the number of communication terminal devices that have normally received a signal by the output of the receiving means after transmitting the broadcast signal. A communication abnormality detection device including a plurality of communication terminal devices and a transmission communication line that is a transmission line of signals transmitted and received by the communication abnormality detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63224230A JPH0748738B2 (en) | 1988-09-07 | 1988-09-07 | Communication error detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63224230A JPH0748738B2 (en) | 1988-09-07 | 1988-09-07 | Communication error detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0272739A JPH0272739A (en) | 1990-03-13 |
| JPH0748738B2 true JPH0748738B2 (en) | 1995-05-24 |
Family
ID=16810540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63224230A Expired - Fee Related JPH0748738B2 (en) | 1988-09-07 | 1988-09-07 | Communication error detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0748738B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61177047A (en) * | 1985-01-31 | 1986-08-08 | Matsushita Electric Ind Co Ltd | Centralized control system for terminal |
-
1988
- 1988-09-07 JP JP63224230A patent/JPH0748738B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61177047A (en) * | 1985-01-31 | 1986-08-08 | Matsushita Electric Ind Co Ltd | Centralized control system for terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0272739A (en) | 1990-03-13 |
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