JPH0316815B2 - - Google Patents
Info
- Publication number
- JPH0316815B2 JPH0316815B2 JP57155949A JP15594982A JPH0316815B2 JP H0316815 B2 JPH0316815 B2 JP H0316815B2 JP 57155949 A JP57155949 A JP 57155949A JP 15594982 A JP15594982 A JP 15594982A JP H0316815 B2 JPH0316815 B2 JP H0316815B2
- Authority
- JP
- Japan
- Prior art keywords
- transmitters
- monitoring device
- central monitoring
- transmitter
- current
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
- H04Q9/14—Calling by using pulses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/547—Systems for power line communications via DC power distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5495—Systems for power line communications having measurements and testing channel
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Selective Calling Equipment (AREA)
- Dc Digital Transmission (AREA)
- Small-Scale Networks (AREA)
Description
【発明の詳細な説明】
この発明は、物理量を測定する複数の測定器
（以下、トランスミツタともいう。）からの測定値
をセンタ（集中管理室）側へ伝送するための測定
値伝送システムに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measured value transmission system for transmitting measured values from a plurality of measuring instruments (hereinafter also referred to as transmitters) that measure physical quantities to a center (centralized control room). .
一般に、この種のシステムにおいては、少ない
伝送線で多数のデータを正確に伝送することが望
ましい。 Generally, in this type of system, it is desirable to accurately transmit a large amount of data using a small number of transmission lines.
従来、かかる伝送システムとして第１図の如き
ものが知られている。なお、第１図は測定値伝送
システムの従来例を示すブロツク図である。すな
わち、複数のトランスミツタ１1〜１oはそれぞれ
個別の伝送線ｌを介して集中管理室内装置２1〜
２oと接続され、該集中管理室内装置２1〜２oか
ら直流電圧を供給されて動作し、その測定量に応
じて直流電流を変調して管理室側へ送出する。こ
の方式は構成および制御が簡単であるという利点
を有する反面、トランスミツタ数と同数の伝送線
が必要となるため、その経済的な負担が大きいと
いう欠点を有している。 Conventionally, such a transmission system as shown in FIG. 1 has been known. Note that FIG. 1 is a block diagram showing a conventional example of a measured value transmission system. That is, the plurality of transmitters 1 1 - 1 o are connected to the central control indoor devices 2 1 - 1 through individual transmission lines l, respectively.
2o , and is operated by being supplied with DC voltage from the centralized control indoor devices 21 to 2o , and modulates the DC current according to the measured amount and sends it to the control room side. Although this method has the advantage of being simple in configuration and control, it has the disadvantage of being a heavy economic burden because it requires the same number of transmission lines as the number of transmitters.
この発明はかかる欠点を除去すべくなされたも
ので、伝送線数を増やすことなく多数のトランス
ミツタを接続しうるとともに、高品質のデータ伝
送が可能な伝送システムを提供することを目的と
する。 The present invention has been made to eliminate such drawbacks, and an object of the present invention is to provide a transmission system that can connect a large number of transmitters without increasing the number of transmission lines and that can perform high-quality data transmission.
その特徴は、物理量を測定する複数のトランス
ミツタを２線式伝送線上に並設し、該トランスミ
ツタからの測定値を多重化し該伝送線を介して集
中監視装置へ伝送する一方、該集中監視装置は伝
送線の線間直流電圧を適宜に変調することにより
各トランスミツタを個別に呼び出し、該呼び出さ
れたトランスミツタは定電流化された直流電流を
変調して送出する測定値伝送システムであつて、
前記集中監視装置には直流電源と直列にツエナー
ダイオードを接続するとともに、該ツエナーダイ
オードを短絡，開放するスイツチング素子と該ス
イツチング素子をオン，オフさせる制御手段とを
設け、前記各トランスミツタには定電流化された
直流電流を供給する電流供給手段と、該直流電流
を測定値に応じて変調する変調手段と、前記集中
監視装置からの呼び出し信号を検出する検出手段
と、信号および電源を電気的に分離するフオトカ
プラとを設けた点にある。 The feature is that multiple transmitters that measure physical quantities are installed in parallel on a two-wire transmission line, and the measured values from the transmitters are multiplexed and transmitted to a central monitoring device via the transmission line. The device calls each transmitter individually by appropriately modulating the line-to-line direct current voltage of the transmission line, and the called transmitter is a measured value transmission system that modulates and sends a constant current direct current. hand,
The central monitoring device is provided with a Zener diode connected in series with the DC power supply, a switching element for short-circuiting and opening the Zener diode, and a control means for turning the switching element on and off. A current supply means for supplying a converted direct current; a modulation means for modulating the direct current according to a measured value; a detection means for detecting a call signal from the central monitoring device; The main feature is that a photocoupler is provided to separate the two.
以下、この発明の実施例を図面を参照して説明
する。 Embodiments of the present invention will be described below with reference to the drawings.
第２図はこの発明の実施例を示す全体構成図、
第３図は呼び出し信号および測定値データ信号を
示す波形図、第４図は集中管理室側装置（アダプ
タ）の構成を示す構成図、第５図はトランスミツ
タの構成を示す構成図である。 FIG. 2 is an overall configuration diagram showing an embodiment of this invention;
FIG. 3 is a waveform diagram showing a call signal and a measured value data signal, FIG. 4 is a block diagram showing the structure of the central control room side device (adapter), and FIG. 5 is a block diagram showing the structure of the transmitter.
第２図からも明らかなように、この実施例では
複数のトランスミツタ１1〜１oが共通の伝送線ｌ
に並設される一方、集中管理室にはアダプタ３が
設けられる。したがつて、アダプタ３において、
例えば直流電源Ｅを変調して第３図Ａに示される
如きトランスミツタ個別の呼び出し信号P1，P2
……を作り、この信号によつて各トランスミツタ
１1〜１oを選択する。呼び出されたトランスミツ
タは、第３図Ｂの如く伝送ラインの直流電流にデ
ータ信号T1，T2……を重畳した信号を伝送する。
なお、信号電流のうちのベース分（It）は定電流
化され、それぞれトランスミツタを動作させるた
めに使用される。また、この信号電流の変調は
PCM，PWMまたは周波数のいずれでもよいも
のである。 As is clear from FIG. 2, in this embodiment, a plurality of transmitters 11 to 1o are connected to a common transmission line l.
The central control room is provided with an adapter 3. Therefore, in adapter 3,
For example, by modulating the DC power source E, individual transmitter calling signals P 1 , P 2 as shown in FIG. 3A are generated.
..., and each transmitter 1 1 to 1 o is selected by this signal. The called transmitter transmits a signal in which data signals T 1 , T 2 . . . are superimposed on the direct current of the transmission line as shown in FIG. 3B.
Note that the base portion (I t ) of the signal current is made constant and used to operate each transmitter. Also, the modulation of this signal current is
It may be PCM, PWM or frequency.
ここで、アダプタの具体的な構成について第４
図を参照して説明する。 Here, we will explain the specific configuration of the adapter in the fourth section.
This will be explained with reference to the figures.
すなわち、同図に示されるように、アダプタは
マイクロプロセツサの如き演算制御装置（単に、
CPUともいう。）４を有するとともに、電源Ｅと
直列にツエナーダイオードZDが設けられ、この
ツエナーダイオードZDの両端には、例えばFET
（電界効果トランジスタ）の如きスイツチング素
子が接続されている。したがつて、CPU４によ
つて例えばFETを所定の周波数でオン，オフす
れば、ツエナーダイオードZDは短絡，開放され、
先の第３図Ａの如き呼出し信号P1，P2……が得
られることになる。なお、第３図Ａにおいて、
VZDはツエナー電圧である。CPU４は、各トラン
スミツタから送られてくる第３図Ｂの如き電流信
号Ｉを抵抗Ｒによつて電圧信号に変え、端子SIを
介して取り込み、所定の演算処理をして所望の受
信計器へ伝送する。 That is, as shown in the same figure, the adapter is an arithmetic and control device such as a microprocessor (simply,
Also called CPU. ) 4, and a Zener diode ZD is provided in series with the power supply E. For example, a FET is connected to both ends of the Zener diode ZD.
A switching element such as a field effect transistor (field effect transistor) is connected. Therefore, if the CPU 4 turns on and off the FET at a predetermined frequency, the Zener diode ZD will be short-circuited or opened,
The calling signals P 1 , P 2 . . . as shown in FIG. 3A are obtained. In addition, in FIG. 3A,
V ZD is the Zener voltage. The CPU 4 converts the current signal I as shown in Fig. 3B sent from each transmitter into a voltage signal through a resistor R, takes it in through a terminal SI, performs predetermined arithmetic processing, and sends it to a desired receiving instrument. Transmit.
次に、トランスミツタの具体的な構成につい
て、第５図を参照して説明する。同図において、
５１は検出部、５２は検出部選択回路、５３は変
換回路、５４はカウンタ、５５はタイマ、５６は
クロツク発生回路、５７はマイクロコンピユータ
の如き演算制御装置（以下、単にCPUともい
う。）、SCは発光ダイオード−太陽電池ユニツト、
CCは定電流回路、Ｔはトランジスタ、Ｃ１はコ
ンパレータ、PC１，PC２はフオトカプラ、R1，
R2は抵抗である。 Next, the specific configuration of the transmitter will be explained with reference to FIG. In the same figure,
51 is a detection section, 52 is a detection section selection circuit, 53 is a conversion circuit, 54 is a counter, 55 is a timer, 56 is a clock generation circuit, 57 is an arithmetic and control unit such as a microcomputer (hereinafter also simply referred to as CPU), SC is a light emitting diode-solar cell unit,
CC is a constant current circuit, T is a transistor, C1 is a comparator, PC1 and PC2 are photocouplers, R 1 ,
R 2 is the resistance.
検出部５１は、各種物理量を抵抗または容量等
の変化に変えて検出し、検出部選択回路５２は検
出部５１内に設けられる複数の検知素子（コンデ
ンサ，抵抗等）を適宜選択する。変換回路５３は
検出部５１からの検出値を、例えばそれと対応す
る所定周波数のパルス信号に変換し、カウンタ５
４では該パルス信号を計数する。タイマ５５は該
カウンタ５４から計数出力に応じてクロツクパル
ス発生回路５６からクロツクパルスを計数して
CPU５７に与えるので、CPU５７では該計数結
果にもとづいて所定の演算を行ない、物理量を測
定する。この物理量は、さらにフオトカプラPC
１を介してトランジスタＴに与えられ、該トラン
ジスタＴは測定された物理量に応じてオン，オフ
されるため、定電流回路CCにて定電流化された
直流電流が変調され、これによつて測定量を集中
管理室へ伝送する。一方、集中管理室からの呼び
出し信号は、前述の如く電圧信号として送られて
くるので、抵抗R1，R2およびコンパレータＣ１
等によつて検出し、これをフオトカプラPC２を
介してCPU５７に取り込み、該CPU５７にて所
定の演算を行なうことにより自分宛ての呼び出し
信号であるか否かを判別し、それが自分宛てのも
のであるとき、上述の如くして測定量を伝送す
る。 The detection unit 51 detects various physical quantities by converting them into changes in resistance or capacitance, and the detection unit selection circuit 52 appropriately selects a plurality of detection elements (capacitors, resistors, etc.) provided within the detection unit 51. The conversion circuit 53 converts the detected value from the detection unit 51 into a pulse signal of a predetermined frequency corresponding to the detected value, for example, and outputs the detected value to the counter 5.
4, the pulse signals are counted. The timer 55 counts clock pulses from the clock pulse generation circuit 56 according to the count output from the counter 54.
Since it is given to the CPU 57, the CPU 57 performs a predetermined calculation based on the counting result and measures the physical quantity. This physical quantity is further calculated by the photocoupler PC
1 to the transistor T, and the transistor T is turned on and off according to the measured physical quantity, so that the DC current made constant by the constant current circuit CC is modulated, and thereby the measured Transmit the amount to the central control room. On the other hand, the call signal from the central control room is sent as a voltage signal as described above, so the resistors R 1 and R 2 and the comparator C1
etc., this is detected by the CPU 57 via the photocoupler PC2, and the CPU 57 performs a predetermined calculation to determine whether or not the call signal is addressed to the user. At some point, a measured quantity is transmitted as described above.
以上のように、この発明によれば、複数のトラ
ンスミツタを伝送線に並列に接続するようにした
から、トランスミツタの数にかかわりなく一対の
伝送線を設けるだけでデータの伝送が可能とな
り、また、測定値信号は直流電流を変調して送出
するようにしたので、ノイズに強い伝送が可能で
あるという利点を有するものである。さらに、フ
オトカプラを介して測定回路を接続する構成とし
ているため、アースノイズに対して極めて強いと
いう利点もある。第１図に示されるような従来方
式においては、保護回路またはツエナーバリアが
集中管理室内装置のそれぞれに必要とされたが、
この発明によれば、これらが大幅に削減されると
いう効果をもたらすものである。 As described above, according to the present invention, since a plurality of transmitters are connected in parallel to a transmission line, data can be transmitted by simply providing a pair of transmission lines regardless of the number of transmitters. Furthermore, since the measurement value signal is sent by modulating the direct current, it has the advantage that it can be transmitted resistant to noise. Furthermore, since the measurement circuit is connected via a photocoupler, it has the advantage of being extremely resistant to ground noise. In the conventional system as shown in Fig. 1, a protection circuit or Zener barrier was required for each centrally controlled indoor device;
According to the present invention, these can be significantly reduced.
第１図は測定値伝送システムの従来例を示す構
成図、第２図はこの発明の実施例を示す構成図、
第３図は集中管理室からトランスミツタへ送出さ
れる呼び出し信号およびトランスミツタから集中
管理室へ送られる電流信号を示す波形図、第４図
は集中管理室側装置（アダプタ）の構成を示す構
成図、第５図はトランスミツタの構成を示す構成
図である。
符号説明、１……トランスミツタ、２……集中
管理室内装置、３……アダプタ、４，５７……演
算制御装置（CPU）、５１……検出部、５２……
検出部選択回路、５３……変換回路、５４……カ
ウンタ、５５……タイマ、５６……クロツク発生
回路、ZD……ツエナーダイオード、Ｔ，FET…
…スイツチング素子、SC……発光ダイオード太
陽電池ユニツト、Ｃ１……コンパレータ、PC１，
PC２……フオトカプラ。
FIG. 1 is a block diagram showing a conventional example of a measured value transmission system, FIG. 2 is a block diagram showing an embodiment of the present invention,
Figure 3 is a waveform diagram showing the call signal sent from the central control room to the transmitter and the current signal sent from the transmitter to the central control room, and Figure 4 is the configuration showing the configuration of the central control room side device (adapter). FIG. 5 is a configuration diagram showing the configuration of the transmitter. Description of symbols, 1... Transmitter, 2... Central control indoor device, 3... Adapter, 4, 57... Arithmetic control unit (CPU), 51... Detection unit, 52...
Detection section selection circuit, 53... Conversion circuit, 54... Counter, 55... Timer, 56... Clock generation circuit, ZD... Zener diode, T, FET...
...Switching element, SC...Light emitting diode solar cell unit, C1...Comparator, PC1,
PC2...photo coupler.
Claims (1)
線式伝送線上に並設し、該トランスミツタからの
測定値を多重化し該伝送線を介して集中監視装置
へ伝送する一方、該集中監視装置は伝送線の線間
直流電圧を適宜に変調することにより各トランス
ミツタを個別に呼び出し、該呼び出されたトラン
スミツタは定電流化された直流電流を変調して送
出する測定値伝送システムであつて、 前記集中監視装置には直流電源と直列にツエナ
ーダイオードを接続するとともに、該ツエナーダ
イオードを短絡，開放するスイツチング素子と該
スイツチング素子をオン，オフさせる制御手段と
を設け、前記各トランスミツタには定電流化され
た直流電流を供給する電流供給手段と、該直流電
流を測定値に応じて変調する変調手段と、前記集
中監視装置からの呼び出し信号を検出する検出手
段と、信号および電源を電気的に分離するフオト
カプラとを設けてなることを特徴とする測定値伝
送システム。[Claims] 1. A plurality of transmitters for measuring physical quantities, 2.
They are installed in parallel on a wire transmission line, and the measured values from the transmitters are multiplexed and transmitted to a central monitoring device via the transmission line, while the central monitoring device appropriately modulates the line-to-line DC voltage of the transmission line. As a result, each transmitter is called individually, and the called transmitter is a measurement value transmission system that modulates and sends out a constant current DC current, and the central monitoring device has a Zener connected in series with the DC power supply. Current supply means for supplying constant current to each of the transmitters, comprising a switching element that connects the diode, short-circuits and opens the Zener diode, and a control means that turns on and off the switching element; and a modulation means for modulating the direct current according to a measured value, a detection means for detecting a call signal from the central monitoring device, and a photocoupler for electrically separating the signal and the power source. measurement value transmission system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57155949A JPS5945740A (en) | 1982-09-09 | 1982-09-09 | Measuring value transmission system |
| DE19833329049 DE3329049A1 (en) | 1982-09-09 | 1983-08-11 | Data Communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57155949A JPS5945740A (en) | 1982-09-09 | 1982-09-09 | Measuring value transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5945740A JPS5945740A (en) | 1984-03-14 |
| JPH0316815B2 true JPH0316815B2 (en) | 1991-03-06 |
Family
ID=15617045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57155949A Granted JPS5945740A (en) | 1982-09-09 | 1982-09-09 | Measuring value transmission system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5945740A (en) |
| DE (1) | DE3329049A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4598396A (en) * | 1984-04-03 | 1986-07-01 | Itt Corporation | Duplex transmission mechanism for digital telephones |
| DE3502309A1 (en) * | 1985-01-21 | 1986-07-24 | Siemens AG, 1000 Berlin und 8000 München | DATA TRANSFER SYSTEM |
| DE3786712D1 (en) * | 1986-06-16 | 1993-09-02 | Siemens Ag | SENSOR ARRANGEMENT FOR CONTROLLING IMPLANTABLE BODY SPARE PARTS. |
| FR2622327B1 (en) * | 1987-10-27 | 1992-02-07 | Lewiner Jacques | IMPROVEMENTS TO FACILITIES TO CONTROL ACCESS TO PROTECTED SPEAKERS |
| FR2629609B1 (en) * | 1988-03-31 | 1990-12-28 | Jacques Lewiner | IMPROVEMENTS TO ELECTRONIC INTERROGATION CIRCUITS |
| FR2638919B1 (en) * | 1988-11-04 | 1994-09-02 | Merlin Gerin | AUTOMATION FOR TECHNICAL MANAGEMENT OF BUILDINGS WITH TWO-WIRE LINE FOR DATA AND ENERGY TRANSMISSION |
| FI100139B (en) * | 1988-11-04 | 1997-09-30 | Schneider Electric Sa | Monitoring device for the technical operation of a building |
| DE3907652A1 (en) * | 1989-03-09 | 1990-09-13 | Siemens Ag | CIRCUIT ARRANGEMENT FOR TRANSMITTING BINARY SIGNALS AND ENERGY OVER A LINE |
| US5142277A (en) * | 1990-02-01 | 1992-08-25 | Gulton Industries, Inc. | Multiple device control system |
| FR2679053B1 (en) * | 1991-07-12 | 1995-01-27 | Handycom | SERVO SYSTEM, IN PARTICULAR BY CONTROLLING AND CONTROLLING A PLURALITY OF SAFETY DEVICES. |
| JPH0685228B2 (en) * | 1992-10-21 | 1994-10-26 | ソニー株式会社 | Disk player optical head device |
| DE4404443C2 (en) * | 1993-02-12 | 1996-12-12 | Siemens Ag | Circuit arrangement for message transmission |
| DE4323619C1 (en) * | 1993-07-15 | 1994-08-18 | Daimler Benz Ag | Apparatus for the transmission of a plurality of sensor signals to an electronic control device |
| FR2726676B1 (en) * | 1994-11-09 | 1997-01-31 | Peugeot | DEVICE FOR ELECTRICALLY CONNECTING FIRST COMPONENTS INTEGRATED IN A STEERING WHEEL, ESPECIALLY A MOTOR VEHICLE AND SECOND COMPONENTS INTEGRATED IN THE REST OF THE STRUCTURE THEREOF |
| GB9517215D0 (en) * | 1995-08-23 | 1995-10-25 | Lucas Ind Plc | Communications between remote sensors and central ecu in motor vehicles |
| AU2568197A (en) * | 1996-04-10 | 1997-10-29 | Navigato A/S | A method and apparatus for providing trailer status data to a tractor (tailtag) |
| DE19752742C2 (en) * | 1997-11-28 | 2002-11-07 | Wicon Elektronik Gmbh | Data transmission method |
| EP2375578A1 (en) * | 2010-04-09 | 2011-10-12 | aizo group ag | Method for transmitting data from a transmitter to a receiver in an alternating current network and device for transmitting data for alternating current networks |
| US9991813B2 (en) | 2009-09-30 | 2018-06-05 | Aizo Group Ag | Method for data transmission from a transmitter to a receiver in an AC power supply system, and apparatus for data transmission with AC power supply systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934219Y2 (en) * | 1977-08-15 | 1984-09-21 | 松下電工株式会社 | Dedicated line multiplex transmission equipment |
| FR2403695A1 (en) * | 1977-09-16 | 1979-04-13 | Cii Honeywell Bull | DEVICE FOR ENSURING THE POWER SUPPLY AND THE TRANSMISSION OF ELECTRIC SIGNALS BETWEEN TWO DEVICES THROUGH LOW NUMBER CONTACTS |
| JPS56158556A (en) * | 1980-05-13 | 1981-12-07 | Canon Inc | Digital communication system |
-
1982
- 1982-09-09 JP JP57155949A patent/JPS5945740A/en active Granted
-
1983
- 1983-08-11 DE DE19833329049 patent/DE3329049A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5945740A (en) | 1984-03-14 |
| DE3329049A1 (en) | 1984-03-15 |
| DE3329049C2 (en) | 1992-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0316815B2 (en) | ||
| US4203096A (en) | Sensor monitoring alarm system | |
| US4398178A (en) | Apparatus for transmitting information on an alternating current line | |
| JPS63500831A (en) | Signal transmission device in measuring equipment | |
| KR920005169B1 (en) | Communication control system | |
| JPH0311591B2 (en) | ||
| CZ341395A3 (en) | Process and apparatus for detection and identification of electric cables | |
| US3959786A (en) | Isolated two-wire transmitter | |
| US12355507B2 (en) | Method for transmitting signals between a master device and a slave device | |
| SU1412455A1 (en) | Device for checking multicore cable | |
| JPS5918768Y2 (en) | Two-wire signal transmission device | |
| JP2560733B2 (en) | Bidirectional 2-wire remote control device | |
| JPS6375683A (en) | Apparatus for measuring error of electronic watthour meter | |
| JPS5821039Y2 (en) | 2 Senshikidensouki | |
| SU1425560A1 (en) | Device for measuring insulation resistence in a.c. electric mains | |
| JPH046282Y2 (en) | ||
| SU658489A1 (en) | Measuring power converter | |
| SU883792A1 (en) | Multi-channel telemetric converter of resistance to time interval | |
| SU1005138A1 (en) | Device for transmitting and receiving television signals | |
| JPH0810998Y2 (en) | Function conversion device for 4-wire direct monitoring system | |
| SU1372345A1 (en) | Device for transmitting telemetering information from rotating object | |
| SU1003379A2 (en) | Device for transmitting bipolar telegraphy signals | |
| JPH0664674B2 (en) | Alarm repeater | |
| JPH0741226Y2 (en) | Light current transformer | |
| SU902044A1 (en) | Device for transmitting and receiving discrete signals |