JPS62287722A - Power line communication control equipment - Google Patents
Power line communication control equipmentInfo
- Publication number
- JPS62287722A JPS62287722A JP61132308A JP13230886A JPS62287722A JP S62287722 A JPS62287722 A JP S62287722A JP 61132308 A JP61132308 A JP 61132308A JP 13230886 A JP13230886 A JP 13230886A JP S62287722 A JPS62287722 A JP S62287722A
- Authority
- JP
- Japan
- Prior art keywords
- control terminal
- power line
- transmission request
- load
- address
- 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
Links
- 238000004891 communication Methods 0.000 title claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 57
- 238000012790 confirmation Methods 0.000 claims description 26
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Small-Scale Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
産業上の利用分野
本発明は分散化して配置された機器間で、電力線を信号
の伝送通信路として通信を行なうシステムの電力線通信
制御装置に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention Industrial Application Field The present invention relates to a power line communication control device for a system in which communication is performed between devices disposed in a decentralized manner using a power line as a signal transmission channel. It is something.
従来の技術
複数の機器を集中的に制御したり、現在の機器の状態を
モニタ監視することを目的として、各機器を伝送通信路
として電力線により結び、互いに信号を伝送し合う方法
がある。これは電力線の交流電ギ上にこれより十分高い
周波数の通信用信号電圧を重畳して各機器間を通信させ
るシステムで、制御用の特別配線が不必要なことから、
設置に伴う手間や費用が小さいという特徴を持つ。この
システムでは、各機器が個々に自局アドレスを持ち、他
の機器への送信要求が生じた時は、自局アドレスと、送
信先を示す相手局アドレスと、動作指示を与えるコマン
ドとから構成される信号を伝送通信路である電力線へ送
信する。そして、これを受信した他の機器は、受信信号
の中に含まれる相手局アドレスを自局アドレスと比較し
、もしこれらが異なっていればこの信号内のコマンドを
無視し、もし一致していればこの信号内のコマンドに従
い動作を行なう。ここで機器とは、自己に接続された負
荷（電気器具など）の０Ｎ１０ＦＦ状態を検知し、その
情報を負荷状態報知信号として電力線上に送信する機能
と自己に接続された負荷を０Ｎ１０ＦＦ制御する機能を
有した制御端末や、電力線上の信号を送受信する通信機
能と制御端末に対して送信する０Ｎ１０ＦＦ制御信号を
発生する制御信号発生機能と各制御端末の負荷がＯＮ状
態かＯＦＦ状態かを表示するモニタ機能とを有した電力
線通信制御装置等のことを言う。電力線通信制御装置は
停電復帰時などの電源投入時、各制御端末の負荷の０Ｎ
１０ＦＦ状態を知υ、正常にモニタ機能を動作させるた
めに、各制御端末に対して順次、その制御端末に接続さ
れた負荷の状態を問う負荷状態確認信号の送信を行なう
。この時の電力線通信制御装置の内部動作について次に
図を用いて詳しく説明する。（ただし、これに関係しな
い他の機能に関しては、詳しい動作説明を省略すると同
時に、図面も省略する。）
第２図は従来の電力線通信制御装置の内部構成図である
。１は信号の伝送通信路である電力線である。２は電力
線１上へ信号を送信したり、電力線１上の信号を受信し
たりする通信手段である。2. Description of the Related Art For the purpose of centrally controlling a plurality of devices or monitoring the current state of the devices, there is a method in which each device is connected by a power line as a transmission communication path so that signals can be transmitted to each other. This is a system that superimposes a communication signal voltage of a sufficiently higher frequency on the AC power line of the power line to communicate between each device, and does not require special wiring for control.
It is characterized by low installation effort and cost. In this system, each device has its own address, and when a transmission request to another device occurs, it consists of the own address, the other station address indicating the destination, and a command giving operation instructions. The signal is sent to the power line, which is the transmission communication channel. Then, other devices that receive this compare the partner station address included in the received signal with their own station address, and if they are different, ignore the command in this signal, and if they do not match. It operates according to the commands in the tobacco signal. Here, the device refers to the function of detecting the 0N10FF state of the load (electrical appliances, etc.) connected to itself, transmitting that information as a load state notification signal onto the power line, and the function of controlling the load connected to itself in 0N10FF. A communication function that sends and receives signals on the power line, a control signal generation function that generates 0N10FF control signals to be sent to the control terminal, and a display that indicates whether the load of each control terminal is ON or OFF. Refers to a power line communication control device, etc. that has a monitoring function. The power line communication control device sets the load of each control terminal to 0N when the power is turned on, such as when the power is restored from a power outage.
In order to know the 10FF state and operate the monitor function normally, a load state confirmation signal is sent to each control terminal in order to inquire about the state of the load connected to that control terminal. The internal operation of the power line communication control device at this time will be described in detail below with reference to the drawings. (However, regarding other functions that are not related to this, a detailed explanation of their operations will be omitted and the drawings will also be omitted.) FIG. 2 is an internal configuration diagram of a conventional power line communication control device. Reference numeral 1 denotes a power line which is a signal transmission channel. 2 is a communication means for transmitting signals onto the power line 1 and receiving signals on the power line 1.
３は制御端末に対して自己に接続された負荷の状態を問
う負荷状態確認信号の送信を要求する送信要求手段であ
る。４は送信要求手段３の出力により制御端末に対して
負荷状態確認信号の送信を行なうよう通信手段２を制御
する演算制御手段である。Reference numeral 3 denotes a transmission requesting means for requesting the control terminal to transmit a load status confirmation signal inquiring about the status of the load connected to the control terminal. Reference numeral 4 denotes an arithmetic control means for controlling the communication means 2 to transmit a load status confirmation signal to the control terminal based on the output of the transmission request means 3.
以上のように構成された電力線通信制御装置について以
下その動作を説明する。まず停電復帰時などの電源投入
時に送信要求手段３に複数の制御端末に対しての送信要
求が生じる。するとこの出力を受けた演算制御手段４は
、自局アドレスと、送信要求が生じた制御端末の自局ア
ドレスである相手局アドレスと、負荷状態確認コマンド
とから構成される負荷状態確認信号を、送信要求が生じ
た制御端末に対して順次送信するよう通信手段２を制御
する。以上が電力線通信制御装置の内部動作であるが、
この負荷状態確認信号を電力線１を介して受信した制御
端末は、自己に接続された負荷の０Ｎ１０ＦＦ状態を負
荷状態報知信号として電力線１上へ送信するので、これ
を受信することにより電力線通信制御装置は、各制御端
末の負荷の０Ｎ１０ＦＦ状態を知ることができ、正常に
負荷のモニタ機能が作動するようになる。The operation of the power line communication control device configured as described above will be explained below. First, when the power is turned on, such as when the power is restored, a transmission request is made to the transmission request means 3 to a plurality of control terminals. Then, upon receiving this output, the arithmetic control means 4 sends a load status confirmation signal consisting of the own station address, the other station address which is the own address of the control terminal that issued the transmission request, and the load status confirmation command. The communication means 2 is controlled to sequentially transmit data to the control terminals that have made transmission requests. The above is the internal operation of the power line communication control device.
The control terminal that has received this load status confirmation signal via the power line 1 transmits the 0N10FF status of the load connected to itself onto the power line 1 as a load status notification signal. It is possible to know the 0N10FF state of the load of each control terminal, and the load monitoring function can operate normally.
発明が解決しようとする問題点
しかしながら前述のような構成では、電力線通信制御装
置が同一電力線上に複数台存在した場合、本来なら停電
復帰後に１つの制御端末に対して１回のみ負荷状態確認
信号を送信すれば十分であるのに、例えばシステム増設
をした場合複数台の電力線通信制御装置が複数回、同一
制御端末に対し同一信号を送信することになってしまい
、それにより同一制御端末が複数回、負荷状態報知信号
を送信することになり、大変効率の悪いシステムとなっ
てしまう。また、電力線通信制御装置がまだ負荷状態確
認信号を送信していない制御端末から、負荷状態報知信
号を受信した場合、その制御端末に対してはもう負荷状
態確認信号を送る必要性がないにもかかわらず送信して
しまうことになる。Problems to be Solved by the Invention However, in the above-described configuration, if there are multiple power line communication control devices on the same power line, normally the load status confirmation signal is sent to one control terminal only once after the power outage is restored. For example, if the system is expanded, multiple power line communication control devices will end up transmitting the same signal to the same control terminal multiple times, which may cause the same control terminal to transmit the same signal multiple times. This results in a very inefficient system as the load status notification signal is transmitted twice. Additionally, if the power line communication control device receives a load status notification signal from a control terminal that has not yet transmitted a load status confirmation signal, there is no need to send a load status confirmation signal to that control terminal. You will end up sending it regardless.
以上のように従来例では、システムが大きくなるにつれ
て停電復帰時などに不必要な信号が重複して電力線上に
送信されることが多く、それによりシステムが正常な動
作をするまでに、多大な時間を必要としていた。As described above, in conventional systems, as the system grows, unnecessary signals are often sent redundantly over the power line when the power goes out, etc., and as a result, a large amount of time is required before the system can operate normally. I needed time.
本発明はこのような問題点を解決するもので、前述のよ
うな停電復帰時にも不必要な信号が電力線上に送信され
ることなく、迅速にシステムが立ち上がるように動作す
る電力線通信制御装置を提供することを目的としている
。The present invention is intended to solve these problems, and provides a power line communication control device that operates so that the system can start up quickly without sending unnecessary signals onto the power line even when the power outage returns as described above. is intended to provide.
問題点を解決するための手段
この目的を達成するために本発明の電力線通信制御装置
は、個々に自局アドレスを有する制御端末に対して自己
に接続された負荷の状態を問う負荷状態確認信号の送信
を要求する送信要求手段と、電力線を通信伝送路として
前記制御端末等と信号の送受信を行なう通信手段と、前
記送信要求手段内の指定されたアドレスを有する制御端
末に対する送信要求を解除する送信要求解除手段と、前
記制御端末から自己に接続された負荷の状態を報知する
負荷状態報知信号を前記通信手段により受信した際、及
び他局が前記負荷状態確認信号を前記制御端末に対して
送信したことを前記通信手段により検知した際に、前記
送信要求解除手段に対してこの制御端末のアドレスに対
応する送信要求を解除するよう指令する演算制御手段と
から構成されている。Means for Solving the Problems In order to achieve this object, the power line communication control device of the present invention sends a load status confirmation signal to each control terminal having its own address to inquire about the status of the load connected to itself. a transmission requesting means for requesting the transmission of the information, a communication means for transmitting and receiving signals with the control terminal, etc. using the power line as a communication transmission path, and canceling the transmission request to the control terminal having the specified address in the transmission requesting means. transmission request canceling means; when the communication means receives a load status notification signal from the control terminal to notify the status of the load connected to itself; and when another station sends the load status confirmation signal to the control terminal; and a calculation control means that instructs the transmission request cancellation means to cancel the transmission request corresponding to the address of the control terminal when the communication means detects that the transmission request has been sent.
作用
本発明は上記した構成により、電力線通信制御装置が複
数台存在するシステムの停電復帰時にも、演算制御手段
が制御端末から自己に接続された負荷の状態を報知する
負荷状態報知信号を通信手段により受信した際、及び他
局が制御端末に対して負荷状態確認信号を送信したこと
を検知した際、送信要求解除手段に対してこの制御端末
のアドレスに対応する送信要求を解除するよう指令する
ことにより、不必要な信号が電力線上に送信されること
なく、迅速にシステムが立ち上がるようになる。According to the above-described configuration, the present invention allows the arithmetic and control means to send a load status notification signal from the control terminal to the communication unit to notify the status of the load connected to itself, even when a power outage is restored in a system including a plurality of power line communication control devices. or when detecting that another station has transmitted a load status confirmation signal to the control terminal, instructs the transmission request cancellation means to cancel the transmission request corresponding to the address of this control terminal. This allows the system to start up quickly without unnecessary signals being transmitted over the power line.
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。ただし従来例において、一般的な電力線通信制
御装置の機能については説明済みなので、ここでは従来
例で問題となった停電復帰時の動作についてのみ説明す
る。したがって、図面においても説明に必要としない他
の機能は省略している。EXAMPLE An example of the present invention will be described below with reference to the drawings. However, in the conventional example, since the functions of a general power line communication control device have already been explained, only the operation upon recovery from a power failure, which was a problem in the conventional example, will be described here. Therefore, other functions not necessary for explanation are omitted in the drawings as well.
第１図は本発明の一実施例における電力線通信制御装置
の内部構成図である。６は信号の伝送通信路である電力
線である。６は電力線６上へ信号を送信したり、電力線
Ｓ上の信号を受信したりする通信手段である。７は制御
端末に対して自己に接続された負荷の状態を問う負荷状
態確認信号の送信を要求する送信要求手段である。８は
送信要求手段内の指定されたアドレスを有する制御端末
に対する送信要求を解除する送信要求解除手段である。FIG. 1 is an internal configuration diagram of a power line communication control device in an embodiment of the present invention. 6 is a power line which is a signal transmission channel. 6 is a communication means for transmitting signals onto the power line 6 and receiving signals on the power line S. Reference numeral 7 denotes a transmission requesting means for requesting the control terminal to transmit a load status confirmation signal inquiring about the status of the load connected to itself. Reference numeral 8 denotes a transmission request canceling means for canceling a transmission request to a control terminal having a specified address in the transmission requesting means.
９は制御端末から自己に接続された負荷の状態を報知す
る負荷状態報知信号を通信手段６により受信した際、及
び他局が負荷状態確認信号を制御端末に対して送信した
ことを通信手段６により検知した際に、送信要求解除手
段８に対してこの制御端末のアドレスに対応する送信要
求を解除するよう指令子る演算制御手段である。Reference numeral 9 indicates when the communication means 6 receives a load state notification signal from the control terminal to notify the state of the load connected to itself, and when another station transmits a load state confirmation signal to the control terminal. This is an arithmetic control means that instructs the transmission request cancellation means 8 to cancel the transmission request corresponding to the address of the control terminal when detected by the control terminal.
以上のように構成された電力線通信制御装置について、
以下その動作について説明する。まず停電復帰時などの
電源投入時に送信要求手段７に複数の制御端末に対して
の負荷状態確認信号の送信要求が生じる。するとこの出
力を受けた演算制御手段９は、自局アドレスと、送信要
求が生じた制御端末の自局アドレスである相手局アドレ
スと、負荷状態確認コマンドとから構成される負荷状態
確認信号を、送信要求が生じた制御端末に対して順次送
信するよう通信手段６を制御する。また演算制御手段９
は、制御端末から自己に接続された負荷の状態を報知す
る負荷状態報知信号を通信手段６により受信した際、及
び他局が負荷状態確認信号を制御端末に対して送信した
ことを通信手段６により検知した際、送信要求解除手段
８に対してこの制御端末のアドレスに対応する送信要求
を解除するよう指令する。そしてこれを受けた送信要求
解除手段８は、送信要求手段子のこのアドレスに対する
送信要求を解除する。したがって、このアドレスを自局
アドレスとする制御端末へは負荷状態確認信号が送信さ
れないことになる。Regarding the power line communication control device configured as above,
The operation will be explained below. First, when the power is turned on, such as when the power is restored, a request is made to the transmission request means 7 to transmit a load status confirmation signal to a plurality of control terminals. Then, the arithmetic control means 9 that received this output sends a load state confirmation signal consisting of the own station address, the other station address which is the own address of the control terminal that issued the transmission request, and the load status confirmation command. The communication means 6 is controlled to sequentially transmit data to the control terminals that have made transmission requests. Also, the calculation control means 9
When the communication means 6 receives a load state notification signal from the control terminal to notify the state of the load connected to itself, and when another station transmits a load state confirmation signal to the control terminal, the communication means 6 When detected, it instructs the transmission request canceling means 8 to cancel the transmission request corresponding to the address of this control terminal. Upon receiving this, the transmission request canceling means 8 cancels the transmission request for this address of the transmission requesting means child. Therefore, the load status confirmation signal will not be transmitted to the control terminal that has this address as its own address.
以上のように本実施例によれば、制御端末から負荷状態
報知信号を受信した際、及び他局が制御端末へ対して負
荷状態確認信号を送信したことを検知した際は、その制
御端末に対する負荷状態確認信号の送信を中止すること
により、複数台電力線通信制御装置が同一システム内に
存在する場合の停電復帰時にも、不必要な信号が電力線
上に送信されることなく、迅速にシステムが立ち上がる
ようになる。As described above, according to this embodiment, when a load status notification signal is received from a control terminal or when it is detected that another station has transmitted a load status confirmation signal to the control terminal, By discontinuing the transmission of load status confirmation signals, even when a power outage returns when multiple power line communication control devices exist in the same system, unnecessary signals are not sent on the power line, and the system can be quickly restored. Start standing up.
なお、本実施例においては停電復帰時についてのみ記し
たが、これは制御端末に対する負荷状態確認信号の送信
要求が生じた際には全く同じように動作する。In this embodiment, only the case when the power is restored is described, but it operates in exactly the same way when a request to send a load status confirmation signal to the control terminal is made.
発明の効果
以上のように本発明の電力線通信制御装置は、個々に自
局アドレスを有する制御端末に対して自己に接続された
負荷の状態を問う負荷状態確認信号の送信を要求する送
信要求手段と、電力線を通信伝送路として前記制御端末
等と信号の送受信を行なう通信手段と、前記送信要求手
段内の指定されたアドレスを有する制御端末に対する送
信要求を解除する送信要求解除手段と、前記制御端末か
ら自己に接続された負荷の状態を報知する負荷状態報知
信号を前記通信手段により受信した際、及び他局が前記
負荷状態確認信号を前記制御端末に対して送信したこと
を前記通信手段により検知した際に、前記送信要求解除
手段に対してこの制御端末のアドレスに対応する送信要
求を解除するよう指令する演算制御手段とを有すること
により、複数台電力線通信制御装置が同一システム内に
存在する場合の停電復帰時にも、不必要な信号が電力線
上に送信されることなく、迅速にシステムが立ち上がる
ようになυ、その効果は犬なるものがある。Effects of the Invention As described above, the power line communication control device of the present invention includes transmission requesting means for requesting each control terminal having its own address to transmit a load status confirmation signal inquiring about the status of the load connected to itself. a communication means for transmitting and receiving signals with the control terminal etc. using a power line as a communication transmission path; a transmission request canceling means for canceling a transmission request to a control terminal having a specified address in the transmission request means; When the communication means receives a load state notification signal from the terminal to notify the state of the load connected to the terminal, and the communication means indicates that another station has transmitted the load state confirmation signal to the control terminal. and arithmetic control means that, when detected, instructs the transmission request cancellation means to cancel the transmission request corresponding to the address of the control terminal, whereby a plurality of power line communication control devices exist in the same system. Even when a power outage returns, unnecessary signals are not sent over the power line, and the system can be started up quickly.
第１図は本発明の一実施例における電力線通信制御装置
の内部構成図、第２図は従来の電力線通信制御装置の内
部構成図である。
６・・・・・・電力線、６・・・・・・通信手段、７・
・曲送信要求手段、８・・・・・・送信要求解除手段、
９・・曲演算制御手段。FIG. 1 is an internal configuration diagram of a power line communication control device according to an embodiment of the present invention, and FIG. 2 is an internal configuration diagram of a conventional power line communication control device. 6...Power line, 6...Communication means, 7.
・Music transmission request means, 8...Transmission request cancellation means,
9. Music calculation control means.
Claims (1)
続された負荷の状態を問う負荷状態確認信号の送信を要
求する送信要求手段と、電力線を通信伝送路として前記
制御端末等と信号の送受信を行なう通信手段と、前記送
信要求手段内の指定されたアドレスを有する制御端末に
対する送信要求を解除する送信要求解除手段と、前記制
御端末から自己に接続された負荷の状態を報知する負荷
状態報知信号を前記通信手段により受信した際、及び他
局が前記負荷状態確認信号を前記制御端末に対して送信
したことを前記通信手段により検知した際に、前記送信
要求解除手段に対してこの制御端末のアドレスに対応す
る送信要求を解除するよう指令する演算制御手段とを有
する電力線通信制御装置。Transmission requesting means for requesting each control terminal having its own station address to transmit a load status confirmation signal inquiring about the status of the load connected to itself, and transmitting and receiving signals with the control terminal etc. using a power line as a communication transmission path. a transmission request canceling unit for canceling a transmission request to a control terminal having a specified address in the transmission requesting unit; and a load status notification for notifying the status of a load connected to the control terminal from the control terminal. When a signal is received by the communication means, and when the communication means detects that another station has transmitted the load status confirmation signal to the control terminal, the control terminal a power line communication control device comprising: arithmetic control means for instructing to cancel a transmission request corresponding to an address;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61132308A JPH0683123B2 (en) | 1986-06-06 | 1986-06-06 | Power line communication controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61132308A JPH0683123B2 (en) | 1986-06-06 | 1986-06-06 | Power line communication controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62287722A true JPS62287722A (en) | 1987-12-14 |
| JPH0683123B2 JPH0683123B2 (en) | 1994-10-19 |
Family
ID=15078271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61132308A Expired - Lifetime JPH0683123B2 (en) | 1986-06-06 | 1986-06-06 | Power line communication controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0683123B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0282821A (en) * | 1988-09-20 | 1990-03-23 | Fujitsu Denso Ltd | Power line carrier communication equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57106261A (en) * | 1980-12-22 | 1982-07-02 | Yokogawa Hokushin Electric Corp | Data transmission device |
-
1986
- 1986-06-06 JP JP61132308A patent/JPH0683123B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57106261A (en) * | 1980-12-22 | 1982-07-02 | Yokogawa Hokushin Electric Corp | Data transmission device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0282821A (en) * | 1988-09-20 | 1990-03-23 | Fujitsu Denso Ltd | Power line carrier communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0683123B2 (en) | 1994-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS62287722A (en) | Power line communication control equipment | |
| JPH10241086A (en) | Short-circuit detecting method in monitoring system for disaster prevention, monitoring method for disaster prevention using the same and monitoring system for disaster prevention | |
| JP2666849B2 (en) | Remote monitoring device | |
| JP2654139B2 (en) | Branch for wireless signal line of remote monitoring and control system | |
| JPH02184199A (en) | Terminal equipment interface | |
| JP3145538B2 (en) | Load control device | |
| JP2800018B2 (en) | Baseband network system | |
| JPH0244178B2 (en) | ||
| JPH0332937B2 (en) | ||
| JP2568295B2 (en) | Control output coordination device in remote control device | |
| JPH0819070A (en) | Home controller | |
| JPH01220094A (en) | Home bus system | |
| JP2793398B2 (en) | Ring circuit monitoring method | |
| JPH039698A (en) | Communication equipment | |
| JPH07336362A (en) | Supervisory and controlling device | |
| JPH0245792A (en) | Automatic time setting device | |
| JPH0551240B2 (en) | ||
| JPH01212200A (en) | Terminal device for power line carrier system | |
| JPS62107552A (en) | Transmission control equipment | |
| JPH05304692A (en) | External data switching transmission device | |
| JPS61134140A (en) | Transmission controlling method | |
| JPH0738655B2 (en) | Preliminary identification method of availability of access to line processing unit by standby processor | |
| JPH0360241A (en) | Remote supervisory control system | |
| JPH01100696A (en) | Home controller | |
| JPH0654889B2 (en) | Power line carrier system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |