JPH0241065A - Remote monitor controller - Google Patents

Remote monitor controller

Info

Publication number
JPH0241065A
JPH0241065A JP19180688A JP19180688A JPH0241065A JP H0241065 A JPH0241065 A JP H0241065A JP 19180688 A JP19180688 A JP 19180688A JP 19180688 A JP19180688 A JP 19180688A JP H0241065 A JPH0241065 A JP H0241065A
Authority
JP
Japan
Prior art keywords
modem
control circuit
center station
remote control
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.)
Pending
Application number
JP19180688A
Other languages
Japanese (ja)
Inventor
Tetsuo Nojiri
野尻 哲郎
Yuki Kusaka
草鹿 由紀
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP19180688A priority Critical patent/JPH0241065A/en
Publication of JPH0241065A publication Critical patent/JPH0241065A/en
Pending legal-status Critical Current

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  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To prevent illegitimate access by inhibiting automatic reply to a MODEM of a remote control circuit connecting to a public telephone network and outputting a ringer signal and an autonomous call signal with respect to a control request signal from a center station. CONSTITUTION:A control request signal U is sent from a center station 2 to a remote control circuit 3 via a MODEM 4, a public telephone network 1 and a MODEM 5. The MODEM 5 is subjected to inhibition of automatic reply outputs a ringer signal S instead. Since the MODEM 5 is connected to one of monitor items N, an autonomous call signal J is set to inform the information to a predetermined center station 2 and is connected to the center station 2. Since the remote control circuit is connected only to the predetermined station, illegitimate access from the third party is completely prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、遠方監視制御装置に係り、と(に不正アクセ
ス防止用として好適な遠方監視制御装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring and control device, and more particularly, to a remote monitoring and control device suitable for preventing unauthorized access.

〔従来の技術〕[Conventional technology]

遠方監視制御装置における、不正アクセスの防止は、従
来より重要課題の一つとなっている。従来より行われて
いる不正アクセス防止策としてはコールバック機能付き
モデム(MODEM)を使用゛して予め定められた局に
かけ直す方式のもの、又は制御コードを暗号化する方式
若しくはパスワードを付加する方式等、いくつかの方式
のものがある。
Prevention of unauthorized access to remote monitoring and control devices has long been one of the important issues. Conventional measures to prevent unauthorized access include using a modem with a callback function (MODEM) to call back to a predetermined station, or encrypting the control code or adding a password. There are several methods such as.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、上記従来例にあって、例えばコールバッ
ク機能付きモデムを使用するものについては、不正アク
セス防止用として特に必要としていない種々の機能(セ
ンタ局の保全性を高める機能や複数のコールバックの登
録機能)を有しており、これがためシステム全体が高価
となる、という欠点を有している。
However, among the above conventional examples, for example, those that use a modem with a callback function have various functions that are not particularly necessary for preventing unauthorized access (such as a function to improve the integrity of the center station and the registration of multiple callbacks). This has the disadvantage that the entire system is expensive.

また、制御コードを暗号化又はパスワードを付加する場
合には、これらを付加するための装置が高価であり、暗
号・パスワードがもれた時には保全性は無効となるとい
う欠点があった。
Furthermore, when the control code is encrypted or a password is added, the equipment for adding these codes is expensive, and there is a drawback that the integrity becomes invalid if the code or password is leaked.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、かかる従来例の有する不都合を改善し
、とくに公衆回線等からの不正アクセスを有効に防止す
ることのできる遠方監視制御装置を提供することにある
SUMMARY OF THE INVENTION An object of the present invention is to provide a remote monitoring and control device that can overcome the disadvantages of the conventional system and, in particular, can effectively prevent unauthorized access from public lines and the like.

[課題を解決するための手段] 本発明では、公衆電話網を介してセンタ局側と遠方制御
回路側とにそれぞれモデムを装備して成る遠方監視制御
装置において、前記遠方制御回路側のモデムとして自動
応答禁止機能を備えたモデムを使用するとともに、この
モデムから出力されるリンガ−信号を前記遠方制御回路
の監視項目の一つとして入力する構成とし、前記遠方制
御回路が、前記センタ局からの制御要求信号に対して前
記リンガ−信号を出力する限定応答機能と、このリンガ
−信号の出力とともに自律発呼信号を出力してセンタ局
との接続を図るセンタ局接続機能とを備える、という構
成を採っている。これによって前述した目的を達成しよ
うとするものである。
[Means for Solving the Problems] In the present invention, in a remote monitoring and control device which is equipped with a modem on the center station side and on the remote control circuit side via a public telephone network, as the modem on the remote control circuit side, A modem equipped with an automatic response prohibition function is used, and a ringer signal outputted from the modem is inputted as one of the monitoring items of the remote control circuit, and the remote control circuit is configured to receive signals from the center station. A configuration comprising a limited response function that outputs the ringer signal in response to a control request signal, and a center station connection function that outputs an autonomous calling signal together with the ringer signal to establish connection with the center station. are taken. This aims to achieve the above-mentioned purpose.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を第1図に基づいて説明する。 An embodiment of the present invention will be described below with reference to FIG.

この第1図の実施例は、公衆電話網1を介してセンタ局
2側と遠方制御回路3側とにそれぞれモデムを4.5が
装備されている。
In the embodiment shown in FIG. 1, 4.5 modems are respectively installed on the center office 2 side and the remote control circuit 3 side via the public telephone network 1.

遠方制御回路3例のモデム5としては自動応答禁止機能
を備えたモデムが使用されている。このモデム5からは
、リンガ−信号Sが出力されるようになっている。この
リンガ−信号Sは遠方制御回路3の監視項目Nの一つと
して当該遠方制御回路3に入力されるようになっている
As the modem 5 of the three remote control circuits, a modem equipped with an automatic response prohibition function is used. This modem 5 outputs a ringer signal S. This ringer signal S is input to the remote control circuit 3 as one of the monitoring items N of the remote control circuit 3.

ここで、遠方制御回路3は、センタ局2からの制御要求
信号Uに対してリンガ−信号Sを出力する限定応答機能
と、このリンガ−信号Sの出力とともに自律発呼信号J
を出力してセンタ局2との接続を図るセンタ局接続機能
とを備えている。
Here, the remote control circuit 3 has a limited response function of outputting a ringer signal S in response to a control request signal U from the center station 2, and an autonomous calling signal J along with outputting this ringer signal S.
It also has a center station connection function that outputs and connects to the center station 2.

次に上記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.

まず、センタ局2から遠方制御回路3へ制御要求信号U
が送り込まれる。すると、モデム5は、自動応答が禁止
されているので応答は返さない代りにリンガ−信号Sを
出力する。これが監視項目Nの一つに接続されているの
で、この情報を予め定められたセンタ局2へ通知するた
めに自律発呼信号Jが送り出され、これによってセンタ
局2と接続される。
First, a control request signal U is sent from the center station 2 to the remote control circuit 3.
is sent. Then, since automatic response is prohibited, modem 5 outputs a ringer signal S instead of returning a response. Since this is connected to one of the monitoring items N, an autonomous calling signal J is sent out to notify a predetermined center station 2 of this information, thereby establishing a connection with the center station 2.

この様にして、決められた局だけにしか接続できないの
で、他からの不正アクセスを完全に防止することができ
る。
In this way, since it is possible to connect only to a designated station, unauthorized access from others can be completely prevented.

第2図は、他の不正アクセス例を示す図である。FIG. 2 is a diagram showing another example of unauthorized access.

不正アクセス局9から制御要求信号Uが来ても、遠方制
御回路3は予め定められたセンタ局2と接続するため、
不正アクセス局9には接続できない様になっている。
Even if the control request signal U is received from the unauthorized access station 9, the remote control circuit 3 connects to the predetermined center station 2.
The unauthorized access station 9 cannot be connected to.

〔発明の効果〕〔Effect of the invention〕

以上のように、本発明によると、遠方制御回路の特性と
この遠方制御回路側のモデムの機能とを上述のように構
成したので、公衆電話網に接続された不正アクセス局か
らの不正アクセスをほぼ完全に防止することができる、
という従来にない優れた遠方監視制御装置を提供するこ
とができる。
As described above, according to the present invention, since the characteristics of the remote control circuit and the functions of the modem on the side of the remote control circuit are configured as described above, unauthorized access from unauthorized access stations connected to the public telephone network is prevented. can be almost completely prevented,
It is possible to provide an unprecedented and superior remote monitoring and control device.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示すブロック回路図、第2
図は不正アクセスの他の例を示す説明図である。 1・・・公衆電話網、2・・・センタ局、3・・・遠方
制御回路、4.5・・・モデム、J・・・自律発呼信号
、N・・・監視項目、S・・・リンガ−信号、U・・・
制御要求信号。
FIG. 1 is a block circuit diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram showing another example of unauthorized access. 1... Public telephone network, 2... Center station, 3... Remote control circuit, 4.5... Modem, J... Autonomous call signal, N... Monitoring item, S...・Ringer signal, U...
Control request signal.

Claims (1)

【特許請求の範囲】[Claims] (1)、公衆電話網を介してセンタ局側と遠方制御回路
側とにそれぞれモデムを装備して成る遠方監視制御装置
において、 前記遠方制御回路側のモデムとして自動応答禁止機能を
備えたモデムを使用するとともに、このモデムから出力
されるリンガー信号を前記遠方制御回路の監視項目の一
つとして入力する構成とし、前記遠方制御回路が、前記
センタ局からの制御要求信号に対して前記リンガー信号
を出力する限定応答機能と、このリンガー信号の出力と
ともに自律発呼信号を出力してセンタ局との接続を図る
センタ局接続機能とを備えていることを特徴とした遠方
監視制御装置。
(1) In a remote monitoring and control device that is equipped with a modem on the center station side and on the remote control circuit side via a public telephone network, a modem equipped with an automatic response prohibition function is used as the modem on the remote control circuit side. At the same time, the ringer signal output from the modem is input as one of the monitoring items of the remote control circuit, and the remote control circuit responds to the ringer signal in response to the control request signal from the center station. A remote monitoring and control device characterized by having a limited response function for outputting a limited response, and a center station connection function for connecting to a center station by outputting an autonomous calling signal together with the ringer signal.
JP19180688A 1988-07-30 1988-07-30 Remote monitor controller Pending JPH0241065A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19180688A JPH0241065A (en) 1988-07-30 1988-07-30 Remote monitor controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19180688A JPH0241065A (en) 1988-07-30 1988-07-30 Remote monitor controller

Publications (1)

Publication Number Publication Date
JPH0241065A true JPH0241065A (en) 1990-02-09

Family

ID=16280836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19180688A Pending JPH0241065A (en) 1988-07-30 1988-07-30 Remote monitor controller

Country Status (1)

Country Link
JP (1) JPH0241065A (en)

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