DE3120307A1 - ZONE REPORTING OR LABELING SYSTEM FOR A MONITORING AND / OR CONTROL SYSTEM - Google Patents

Description

Munich, May 21, 1981 Attorney's file: 11 - Pat. 33

American District Telegraph Company, One World Trade Center, Suite 9200, New York, New York 10048, United States of America

Zone reporting or labeling system for a surveillance and / or control system

The invention relates to a zone reporting or identification system for a monitoring;? - and / or control system

- with a central monitoring station containing a control unit,

- With a plurality of sensors arranged at different locations

- as well as with a multi-core connection cable via which the sensors are connected to the monitoring point,

for the location identification of a monitored zone using the normal connection cable provided for connecting the sensors.

Although the invention relates generally to surveillance and / or control systems in which data collected at remote locations is via a cable to a central control device be transmitted, be it initially described in connection with the multi-core burglar alarm system which the data to be transmitted back to the control unit are of a comparatively simple nature. The one unauthorized Signals which are indicative of penetration and which are transmitted back to the control unit consist of an entry a pulse representing an alarm condition. Usually, further information is not needed as all Sensors at the remote locations are of the same type and can therefore only record one type of alarm condition.

As will be explained in more detail below, the invention also deals with the transmission of complex data,

which can include, for example, the distinction between different types of alarm, such as fire or burglary and - in a further embodiment - the monitoring of room temperature, boiler pressure, elevator operation, emergency lighting, etc.

First, however, a zone identification system will be described using an intrusion alarm device as an example.

In multi-core detection systems in which a plurality of Sensors are connected in parallel to a multi-core connection cable, it is when a break-in or is detected an unauthorized manipulation often difficult to determine the location at which the alarm condition was caused. if the security guards or other responsible persons on a If the alarm indicator is to respond, it is difficult for them to identify where the breach occurred and therefore difficult to know how to react.

Known reporting systems are required to display the location of the alarm one or more separate cables. Laying several wires in addition to those for the intrusion alarm system The wires used are expensive and, depending on the type of installation, sometimes impossible.

Audible alarms at the point of intrusion or break-in, which audibly indicate the point in question, are common ineffective, as it warns the intruder and thus gives him the opportunity to escape. In addition, they warn Systems the intruder that his presence is detected so that he can take countermeasures to his capture to prevent. This can endanger the security personnel who have to investigate the intrusion. aside from that acoustic alarm signals at the location of the respective sensor are not suitable for informing the security personnel of the intrusion site, if the central control unit is not within the audible range of all receivers or sensors.

A digital Use code system in which each of the receivers connected to the multi-core cable is assigned a different address code which is evaluated in the central control unit on a time-division multiplex basis, the central control unit a series of codes is generated which, when recorded in a special receiver, is associated with the relevant sensor connect its output to the multi-core cable system. Such a process, of course, requires large amounts Circuit effort for code recognition and code generation. In addition, the training of the staff for the installation of such Systems are complicated and time-consuming, since knowledge of the codes and the code setting procedures are conveyed got to. Furthermore, facilities are required by means of which the zone coding signals from the individual ones normally used to control the ones connected to the multi-core cable Sensors required control signals can be separated. Control signals are usually digital in nature and therefore differ only slightly from the digital signals that are sent out to identify a given sensor will.

A zone identification system is also conceivable in which the individual cables can be selected using the existing cables Sensors take place acoustically or at least with acoustic frequencies, with each sensor having a specific audio frequency assigned. As frequency-determining elements, for example Tuning forks are used in the sensors, so that the sensors by an acoustic signal of the appropriate Frequency can be determined.

The generation of a variety of different acoustic However, frequencies is expensive and requires complex electronic circuitry, such as filter systems for screening the sensor responses from the acoustic carrier used. In addition, since ultrasound equipment is often used in the

Sensors used to detect intruders can cause crosstalk between the ultrasonic devices and the acoustic equipment of the reporting system.

Both in the digitally coded systems described above and in acoustically coded systems, the proportion of False alarms due to the mentioned crosstalk between sensor / control signals and zone identification signals transmitted on the same lines impermissibly high. If separate lines are used for zone identification, the system costs increase strongly if retrofitting with additional cable cores is possible with the given installation is.

The invention is based on the object of a zone identification system to create that does not require any additional cabling, works safely and with comparatively little Effort is to be realized.

This object is achieved by a zone identification system with the features of claim 1.

In the system according to the invention, counters are used in a central control unit and in the sensors, which are common are switchable. The correspondence of the counts in the control unit and the sensors determines the respective Sensor that is activated at a given point in the counter cycle. Thus, the only one necessary for each sensor additional circuitry a counter that has a specific output, for example a plug-in switch pin connected to the rest of the sensor circuit for activation is. This makes it extremely easy to retrofit an already installed system with zone identification. The use of a local counter and switch pin to activate and identify a particular one The sensor is a particularly simple coding device that requires little training on the part of the assembly staff.

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Some advantageous configurations and developments of the invention are described below:

In one embodiment, a message board is provided with indicator lamps or the like, each associated with a given counter output. The counter provided in the control unit is incremented simultaneously with the counters in the sensors, a given sensor being activated only when an output signal appears at a predetermined output of its counter. The activation systems of each sensor are each connected to a different output terminal of the associated meter. During a counter cycle, the sensors are activated one after the other and can transmit an alarm identification signal to one of the wires in the connecting cable. The signals appearing on this wire are fed in parallel to a large number of AND gates with several inputs in the control unit. Each of these AND elements is assigned to an output terminal of the counter in the control device. The outputs of the AND gates activate corresponding display elements on the message board. If a special sensor supplies an output signal that identifies an alarm condition, the simultaneous arrival of a signal from this sensor with the output signal of the counter of the control unit assigned to it causes the assigned AND element to emit an output signal by which an indicator lamp is displayed on the message board or another display element is switched on. The alarm status identifier is locked in a holding circuit so that the relevant display element remains switched on, although the coincidence between the counter output signal and the sensor signal is only given during a clock pulse. By locking the alarm identification, the relevant display element remains switched on and identifies the special sensor that emits an output signal corresponding to the alarm status.

It is therefore only necessary to equip each sensor with one

To equip pulse detector, a counter and an AND gate, which is connected with an input to the intrusion detector and a second input to the corresponding output of the associated counter and is connected to a third input to the output of the pulse detector, so that when all coincidence three signals an output signal is applied to the multi-core connecting cable, which is transmitted back to the control unit. The alarm signal of a given sensor is only available during the duration of a clock pulse and it is the time of coincidence between the arrival of this particular signal from the AND gate of the sensor and an output signal of the counter in the control unit in which the identity of the sending out the alarm identification signal Sensor is determined.

In one embodiment, the alarm identification signal is transmitted back to the control unit via the same wire that is normally used to power the detector. In the case of ultrasonic detectors, this wire carries a high-frequency signal. A pulse can be easily distinguished from this high-frequency signal by filtering it. It is therefore not difficult in the control unit to determine the zone or the location of the alarm condition by passing the high-frequency signal through Filtering is separated, so that only the pulse of the AND element of the sensor remains, which sends the alarm signal. at There is little crosstalk in this embodiment.

The system described is extremely inexpensive as it only has a few simple counters and AND gates with several inputs used. Complicated digital decoding modules or acoustic components are not required for zone identification necessary.

Retrofitting an already installed system with a Such a zone identification device without additional lines is facilitated by the fact that the zone identification signals be chosen so that they are compatible with the already

existing signals used in the installed system are compatible. Thus, the clock can be the same clock, the so-called sustain pulses for transmission to the sensors used, which sustain pulses are used to "freeze" the system. Therefore no additional pulse generator circuit is necessary and the signals are recorded in each sensor during normal operation.

A redundancy for the alarm marking can be achieved, that an alarm condition is indicated not only by the signal state on the alarm wire but also by a signal from a particular AND gate on a different artery such as the high-frequency core.

It was previously assumed that the alarm status signal was only put on the line during the occurrence of an alarm status will. The alarm status signal can, however, also exist in the absence of a signal which is normally present, which stops when an alarm condition is detected or wires in the connecting cable are interrupted or disconnected. this offers protection against unauthorized manipulation in / in which the disconnection the conduction and the cessation of the signal represent an alarm condition monitored by the present system can be.

Although, in the foregoing description, the system has only been dealt with in the context of an alarm condition detector circuit it should be noted that an alarm condition is only one of the conditions monitored by the present system and can be reported.

For example, three different Types of data occur, such as alarm data, to be registered Data and tax data. Alarm data arise when some dangerous situation occurs, for example a boiler overpressure. Registration data contain, for example, the recording of energy consumption.

Finally, tax data includes data necessary for the implementation a control function can be analyzed. For example, the room temperature can be monitored for the furnace control will.

It is important to have data generated at a remote location without the use of complicated modems or digital coding equipment to be able to collect and to be able to select and program the sensors in a suitable manner, so that they can collect a variety of different remote data and perform control functions.

In addition, building monitoring, automation and control systems can also be equipped with security functions be. For example, a system can be programmed so that using fire and intrusion detectors, it is able to determine which particular device is activating is. This is important because, depending on the type of alarm in this example, either the fire brigade or the police must be notified.

There may also be some sensors that daily must be operational for 24 hours, while other sensors are only switched on at night or during such times should be when no activity is expected. For example, so-called window break-in film detectors are to be used often monitored 24 hours a day, while ultrasonic motion detectors are used during business hours should be switched off. Therefore it is important to be able to choose the monitoring base of the sensors.

Another function that may be required is a Entry or exit delay compared to an instantaneous alarm. This feature is usually used to to be able to "arm" the system and then walk away, the system being activated after a predetermined time has elapsed. In the same way, the alarm should be triggered when entering a

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protected area suppressed for a certain period of time to allow an authorized person to "defuse" the system.

There are also examples where an alarm is triggered for redundancy reasons should only be given if a second sensor supplies the same alarm status identifier. One must therefore be able to program the sensors to give an alarm condition signal either immediately or only then output when a second redundant signal is present.

It may be desirable for a remotely located sensor to generate a local alarm at its installation site. In contrast to this, there is the "silent" alarm state, in which the alarm state display takes place in the control unit.

The "warning" feature can also be useful. It is used to remind an authorized person that the System is switched on.

It goes without saying that various alarm signals can also be used be provided, which identify, for example, a lock against burglars.

According to a further development of the invention, there is the possibility provided, during the incremental switching of the in the Sensor arranged counter, which serves as an address counter to suppress the generation of clock pulses and a to generate a second series of clock pulses that advance a so-called auxiliary counter in the sensor. The exits of the auxiliary meter are connected, for example by pins, to circuits that perform the functions described Offer. After addressing a predetermined sensor by means of address clock pulses, further transmission can be carried out these clock pulses are suppressed. Instead, the auxiliary counter in the sensor can be incremented, with

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Information transfer takes place if during stepping of the auxiliary meter a special additional function circuit is activated.

Each sensor can have a number of functions associated with and associated with security or alarm conditions Functions follow which are used for data collection and control. Alternatively, the sensor can also be used exclusively for Security or data collection functions must be set up. If three states are to be monitored during data monitoring, the corresponding sensors can be activated with the Clocking of the auxiliary counter can be operated. If only one of the three conditions is monitored in a given sensor only the switch pin responsible for it is used. A switch pin can be used for the safety status monitoring be used, for example, that the control unit an indication is given that the sensor is switched on 24 hours a day. In one embodiment, the alarm status sensor on the first clock pulse for the auxiliary counter reconnected to the control unit. The insertion of another switch pin leads to that after a predetermined number of clock pulses for the auxiliary counter an indication is transmitted that the alarm is a 24-hour alarm.

When collecting data, the transmitted back to the control unit Information can be an analog signal. In a preferred embodiment, this is a stream, which is proportional to the sensed state.

In contrast to the use of voltage values, the use of a current as an information variable has the advantage that no compensation for the length of the connection ¹ cable is required and that the susceptibility to errors is generally lower.

While it is sometimes desirable to keep the address clock

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pulse, simple data must often be transmitted in the interval between the clock pulses. With uncomplicated data, no suppression of clock pulses is necessary. In general, some primary data can be handled in this way, while complex data requires the suppression of address clocks.

The clock pulses for addressing on the one hand and for the auxiliary functions on the other hand, a distinction can be made between positive pulses for the address clock and positive pulses for the clock the Hi Ifs functions negative impulses are used.

In the following the invention is explained in more detail with reference to the drawings explained:

Fig. 1 shows a block diagram of a burglar alarm system with a multi-core connecting cable in which a plurality of sensors are connected in parallel to the connecting cable,

Fig. 2 shows a schematic block diagram of an embodiment of the zone identification system with a zone determination block in a sensor, a Zone detector in a control unit and a message board,

3 shows a schematic block diagram for the purpose of illustration a circuit to prevent bridging and manipulation attempts for use in an alarm status display system with zone identification without additional return wires,

Figure 4 shows a schematic diagram of one embodiment of a low pass filter for use in the circuit according to FIG. 2,

Figure 5 shows a block diagram of a retrofitted system for use on a permanently installed four-wire intrusion detection system,

Finally, FIG. 6 shows a block diagram of a monitoring system Control system with extended capacity for data

remote collection and control that also uses a four-wire line.

In Fig. 1, a typical intrusion alarm system with multi-wire cabling is shown. It includes a control unit 10 and a number of sensors 12 and 14 shown in FIG
Are connected in parallel to the wires of the multi-wire connection system. There are in the sensors
Switch SW ₅ that open and thus initiate an alarm if someone tamperes with the sensor housing without authorization. An alarm unit 15 is connected to the control unit 10.

In the multi-core line system shown, the
four wires perform the following functions: The lower black wire, labeled B, serves as a ground or return line for the system; the red wire marked R is used for feeding
a DC supply voltage to the sensors; those with Y
The yellow wire marked serves to transmit high-frequency signals, for example to feed ultrasonic devices in the sensors; it can also be used for an "anti-shock" and bridge alarm signal sent by
superimposed on the high-frequency alternating current signal
DC signal is formed; the green wire labeled G is used to transmit control signals with locking, reset and hold functions to the sensors as well as to transmit alarm signals back to the control unit 10. An alarm signal on the green wire G is created by grounding this wire. The ground potential is determined in the control unit 10 and leads to the activation of the alarm unit 15.

The generation of an alarm message indicates - as mentioned - that a break-in has taken place, but it enables no localization of the intruder.

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To provide an inexpensive area display system without the use of complicated addressing procedures the embodiment of the control unit 10 shown in FIG hereinafter referred to as zone detector for short, as well as a message board 22, which is connected to the zone detector. The designated 12 sensor includes a zone identifier 24, which is in connection with the zone detector 20 and the message field 22 of the control unit 10 ensures that a special sensor housing is identified on the message board as soon as a detector 26 arranged in this housing detects an unauthorized entry.

The following describes the process of such a determination and identification: In the sensors as well as in the There are counters 30 and 32 in the control unit. These counters can, for example, be conventional commercially available shift registers or any other counters or equivalent arrangements which can be incremented by clock pulses. In order to increment the counters 30 and 32 at the same time a pulse generator 34 pulses on line 36 and across a switch 38 controllable by a control unit 40 to a line 42 to which all sensors are connected in parallel. There is a pulse detector in each sensor 44, which responds to these regular pulses and via a line 46 signals to the counter 30 and to an input an AND gate 48 supplies. Another input of the AND gate 48 is connected to a locking circuit 50, to which the detector 26 is connected. The interlock circuit 50 provides a continuous signal, as soon as the detector 26 detects an intrusion or some predetermined alarm situation. The third entrance of the AND element 48 is connected to one of the outputs of counter 30. This special output is for the respective sensor characteristic, since the AND gate 48 is connected to a different counter output in each sensor.

The latch circuit 50, the detector 26 and the AND gate 48 and the pulse detector 44, for example includes a monostable multivibrator are conventional Circuit technology built up. As a function of a prolonged pulse arriving via line 42 the pulse detector 44 also generates a reset pulse, which resets the counter 30 via the line 50. The review of the extended pulse is done, for example, by a simple timing element, which consists of a capacitor charging circuit and a comparator which compares the charging voltage of the capacitor with a predetermined voltage. Said capacitor is arranged so that it is charged and discharged when the pulse generator 34 emits short pulses on line 36. Only when the mentioned extended pulse arrives does it reach its charging voltage finally the predetermined threshold value so that the comparator a reset pulse is generated which is fed to the counter 30 will.

A counter control unit is used to generate the reset pulse 54, which is connected to the pulse generator 34 via a line 56. This meter control unit counts the number of pulses generated by the pulse generator 34 and outputs the aforementioned elongated pulse to one Line 58 after it has counted a number of pulses corresponding to the counting volume of the shift register. The extended Pulse is transmitted from line 58 via switch 38 to line 42, which switch 38 is under the influence of a control unit 40 which senses the presence of a pulse on the line 58. Simultaneously with the generation of a prolonged pulse on the line 48, a reset pulse is applied via a line 60 the counter 32 transmitted.

The pulse generator 34 can be omitted in systems that regularly Use any hold impulses that occur. Instead of the pulses generated by a separate pulse generator 34

these holding pulses can themselves be detected by the pulse detectors 44. The holding pulses thus have a double Purpose: On the one hand, they are used for zone identification and, on the other hand, they are used to "freeze" everyone Sensors, if the system is to be entered for the purpose of fault inspection. Such a system will continue described below in connection with FIG. 5.

If a signal occurs in the circuit according to FIG. 2 at the output of the AND gate 48, this is an indication that there is an alarm condition on a special sensor. The AND gate 48 is by the simultaneous occurrence of a alarm signal issued by the interlocking circuit 50, an output pulse of the counter 30 and a pulse on the line 46 activated. This activation of the AND gate 48 occurs only once during the relevant cycle of the counter 30. Its duration corresponds to the length of the pulse generator 34 generated pulses.

The output signal of the AND element 48 is transmitted back to the control unit 10 via a line 64. This includes an intrusion detection and alarm system 66 which receives the alarm signal on line 64. At the same time will the alarm signal is fed to one input of AND gates 68 in each case in parallel. The second inputs of the AND gates 68 are connected to the various outputs of the counter 32. Each output of the counter 32 is therefore one associated with the AND gates 68, the other inputs of all these AND gates 68 is connected in parallel via the line 64 Alarm identification signal supplied.

The simultaneous appearance of an alarm flag signal on line 34 and an output pulse from counter 32 generates an output pulse at the corresponding AND element 68. The output of this AND gate is an associated latch circuit 70 and then a corresponding one Display device 72 in the message board 22 supplied.

The message board 22 can in its simplest embodiment consist of a number of light-emitting diodes, which are so marked are that each of them corresponds to a particular copy of the sensors.

During operation, the pulse generator 34 simultaneously supplies pulses to the counters 30 and 32 so that they are synchronous be advanced. If the counters are designed as shift registers, their outputs are activated one after the other, so that the corresponding AND elements 68, the interlocking circuits 70 and the light emitting diodes 72 are activated one after the other. At the same time the counters 30 are in the sensors advanced with the same sequence. If the detector 26, the associated output of the counter 30 and the pulse detector 44 emit a signal at the same time, the AND gate 48 of the relevant sensor generates a pulse or another signal on the line 64. This is determined in the zone detector 20, the associated AND element 68 in the control unit 10 is activated when, at the same time as the signal on line 64, a special counter output delivers a signal. The message board 22 then provides a suitable display showing not only the alarm status but also the location indicates when the alarm status was determined.

After the counters have run through a cycle, a reset pulse is transmitted and a new counter cycle begins .

The sensors 12 can determine alarm conditions of any kind. The fact that an alarm condition has been given can be transmitted to the control unit via any line. So only existing wires are needed, since every intrusion alarm system has at least one wire which is used to transfer the identification of an alarm state. Due to the common occurrence of this alarm status identifier and a special output signal, the sensor can be identified for which the alarm

state is given.

Alarm states can be activated, for example, by opening on Doors, windows, etc. mounted switches are generated in the event of unauthorized entry into protected rooms, they can are generated by the output signals of ultrasonic detectors or by unauthorized manipulation or bypass attempts caused.

In the system shown in Figure 3, one of the alarm lines is a line by means of which unauthorized manipulations, e.g. disconnection or bridging, are monitored. A sensor 80 includes an intrusion detector 82, which in turn contains a plurality of different detector circuits. The first of these detector circuits is for example a conventional intrusion detection circuit and consists of switches and / or ultrasonic devices. Additionally or alternatively, a circuit can be provided that enables bridging or severing or other manipulations one line monitored. This circuit speaks either to wire breaks or short circuits between the Wires of the multi-wire cable, by means of which the sensors are connected to each other and to the control unit. Furthermore the circuit responds to the bridging of a sensor.

One of the ways a burglar alarm system is ineffective to do is to turn off a given sensor by placing the wires in front of and behind the location of the sensor are connected to each other and then the sensor by disconnecting the wires leading to it from the system to separate out. Systems have been proposed in which the condition of the lead wires leading to a special sensor can be checked, so that wire breaks or - short circuits are monitored. The wire status forms the alarm status, which is scanned and reported back to the control unit will.

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The return of alarm identifiers of any type takes place via a zone identifier 84, which for example is similar to the zone identifier 24 of FIG. The output signal of the zone identifier 84 is used to switch off a Switching device, which in the present embodiment consists of a field effect transistor 86 with a Switch 88 which is, for example, a shock sensitive switch and opens in the event of unauthorized manipulation, and a resistor 90 in the sensor unit 80 is connected in series. The circuit for monitoring unauthorized manipulation and bypassing attempts uses the yellow wire mentioned above Y. For this purpose, the is normally used via this vein transmitted alternating current signals a direct voltage signaling superimposed, wherein the direct current signals are filtered out in the control unit by low-pass filters.

In the following, the determination of an alarm condition on the yellow wire Y is described: A resistor chain is formed, which consists of a resistor R ₁ in the control unit 10, a resistor R ₂ in the sensor 80 and resistors R ^ and R ₄ in other sensors . The resistors R ₁ , R ₂ , R ₃ and R ″ are connected in series with one another by looping the sensors into the yellow wire Y. The return path runs via ground wire B. The resistor chain forms a voltage divider network which has a node 92 _{between resistors R 1} and R _2. This is connected to the inverting input of a comparator 94. The non-inverting input of this comparator is supplied with an adjustable DC voltage from the latter via a voltage divider, which consists of a potentiometer 98 and a resistor 100 and is connected between ground and a supply source 96. The voltage divider point, denoted by 102, located between the potentiometer 98 and the resistor 100 is connected to the non-inverting input of the comparator 94.

When using ultrasonic detectors, a low-pass filter is used 104 for filtering out the from an oscillator 106

for the operation of the ultrasonic detectors arranged in the sensors generated AC voltage signals.

If the detector 82 detects an alarm condition during operation by suitable means, the relevant Field effect transistor 86 controlled by the assigned zone identifier 84 in its non-conductive state. Of the Zone identifier 84 has an AND element which responds when an output signal of the is at its inputs at the same time Intrusion detector 82 and a pulse from a pulse generator arranged in the control unit 10 are present. The pulse generator consists of a unit 108 for generating control pulses, which also include hold pulses. When a A certain field effect transistor 86 is controlled in its non-conductive state, a occurs at the comparator 94 Voltage imbalance by which the alarm unit 110 is activated. The activation of the alarm unit 110 is detected by a zone detector 112, for example corresponds to the zone detector 20 of FIG. 2 and which switches on the associated indicator lamp 114 and thus the location or indicates the area in which the alarm condition was caused.

In the case of a bridging attempt, for example, the yellow one Wire, which is indicated by the dashed line 115, the resistor Rp is short-circuited. This in turn creates an imbalance in the comparator 94, which leads to an alarm, the location of the override attempt on is displayed on the message board.

In the foregoing description, alarm flag signals have been used described that occur on lines that are usually not used for the transmission of alarm identification signals to serve. The yellow wire Y is used for the one described Embodiment for the determination of manipulation and bridging attempts, while the green wire G is used for the transmission of signals as it is with conventional intrusion

monitoring occur. When intrusion detectors attempt a break-in determine, just connect the green wire G to earth potential. This grounding of the green vein G is determined with a main alarm relay 120 in the control unit 10, which switches on the alarm unit 110, wherein the activation of the alarm unit 110 is determined by the zone detector 112 and by the reporting device 114 is shown. The present arrangement forms a redundant system with any type of alarm condition on the yellow Wire Y is displayed for manipulation monitoring, while attempted break-ins are simultaneously detected on the green wire G.

During the day it can of course be undesirable for movements within a given zone to trigger an alarm. To this To avoid, the green wire G can be interrupted by the switch 122, so that neither manipulation attempts can still be reported and displayed on the lead wire on the housing. Switch 122 is closed at night, so that any attempt at tampering, bypassing or intrusion is indicated by the redundant system.

The circuit shown in FIG. 4 is explained below: It is assumed that there are alternating current signals on a wire used as an alarm line. There is a in the vein Low pass filter 130 inserted, which is one made of a resistor and a capacitor 134 includes existing RC element. It is also assumed that the AND gate 48 (Fig. 2) is not with the field effect transistors 86 of FIG. 3 but directly is connected to wire 64 of FIG. It is also assumed that the AND gate 48 is normally a logical one corresponding signal as idle identification and a signal corresponding to the earth potential or a logic 0 as Burglar alarm label generated. Instead of the AND gates of FIG. 2 directly by the output signal of the relevant To activate AND gate 48, a comparator 136 is inserted. This comparator is compared with the

processing line 64 applied signal by its inverting Input the output signal of the low-pass filter 130 is supplied. A resistor 138 is the dem A positive voltage is added to the signal supplied to the inverting input, so that the signal at the inverting input has the value V + when the line core 64 is not grounded.

At the non-inverting input of the comparator 136 is Via a voltage divider formed from resistors 140 and 142, which is connected between supply voltage V + and ground there is a voltage that corresponds to 1/3 V +. A feedback resistor 144 acts on the entire circuit a hysteresis, so that the circuit is based on the individual periods of an oscillator signal on line wire 64 does not respond. When the line core 64 is grounded, the signal at the inverting input drops to 0. The The comparator detects this and supplies an output signal V + which is fed to the AND gates 68 (FIG. 2). To this Thus, AC signals are completely filtered out while grounding lead 64 (FIG. 2) to a positive Voltage is converted, which is fed to the AND gates 68 in the control unit 10.

In this way, a zone identification system is created in which the zone or area in which an unauthorized Penetration takes place through a simple circuit and using only that in the usual multi-core cable existing wires is displayed. The system can be added to existing intrusion warning and alarm systems, so that already installed systems can be retrofitted with a zone display device .. Depending on the type of used The aforementioned redundancy can also be built into the system.

In the following, the retrofitting of an existing system with a zone display device without the use of a separate

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rater _s d "h. additional wires described:

First, a common four-wire burglar alarm and warning system will be explained in general terms. The system includes a control unit and a number of sensors that are connected in parallel between the four wires. Everyone Sensor contains an ultrasonic detector that is operated with a 26 kHz signal * Each sensor has a local one Indicator that indicates the occurrence of an alarm condition and is used as a walk test indicator that the Sensor is locked.

Two of the four wires are used to supply the sensors with DC voltage. The third wire is used for feeding of the 26 kHz signals. The fourth wire is used for control and alarm signaling in two directions. The 26 kHz signal is converted into an ultrasonic 1 vibration by means of electroacoustic transducers arranged in the sensors, which is emitted into the protected area. The 26 kHz signal fed to the individual sensors is generated with the aid of a comparator is reconstructed, i.e. to a given one Level value brought. The comparator is essentially a DC voltage comparator that picks up the 26 kHz signal from the wire and converts it into a square wave in each sensor converts with sharp edges.

The signal wire is a bidirectional line and the signals carried from the control unit to the sensors are voltage level signals that control the local display function of the individual sensors. Be on the signal line Stress states used. The highest voltage is used to reset the local display. The mean voltage value is used to lock the local display and in the locked state hold when an alarm condition occurs until reset by the mentioned high Voltage value takes place. The third and lowest voltage is used to "freeze" the local display, i.

to hold in the state that prevailed at the time at which the hold signal is given on the wire. The purpose of holding the local display is to allow normal system operation without disturbing the state of the display. In other words: The responsible security personnel can put the system on hold and then enter the protected area without the locally displayed information being changed and without the normal operation of the rest of the system being impaired. In this way, the alarm information in the central station is not affected. The main benefit is _{s to} find out if there is a false alarm and to limit the error in question to a specific sensor.

The alarm information is from the sensor on the same Return wire used for local display control. The return signal to the control unit consists of a current that is taken from the control unit by the sensor from which the alarm is issued. In the control unit there is a voltage source which is connected to the signal wire and which does the signaling with three voltage levels regardless of the current via the signal wire from the control unit is removed. This allows the sensors to provide alarm signals without the local display control disturb. If there is a local alarm, the sensor draws a current from the signal wire and this current is in evaluated by the control unit as an alarm signal.

The aforementioned voltage source includes a test resistor and a comparator. As soon as the voltage source supplies a larger current to the signal wire on the appropriate To maintain voltage, this is determined by a monitoring resistor and a comparator. When the stream ■ -exceeds a predetermined value, the comparator conducts set an alarm. Normally, apart from certain stray currents for the input stages of some comparators,

which is extremely small and on the order of microamps, no current in the line. When entering the alarm condition, the current flow is determined by the fact that each sensor has a resistor between the signal wire and Earth switches = The sensitivity of the! Comparator is like this chosen to be responsive to the current flowing at the lowest signal voltage when the resistance is between the signal wire and earth are connected.

Referring now to Figure 5, a remote monitoring system which includes a control unit 200. This control unit has a supply source 202, a 26 kHz oscillator 204, a signal wire logic unit 206 with an alarm current detector 208 and a three-level voltage source 210. Furthermore, one with the alarm current detector 208 connected alarm logic unit 212 as well as a relay 214 is provided, which by the alarm logic unit 212 can be operated * The output of the power supply 202 is connected to terminals 1 and 2. The output of oscillator 204 is connected to a terminal 3 and the output of the signal wire logic unit 206 connected to a terminal 4. The non-retrofitted system has a unit 220 with a single pole Switch 222 with three switch positions and an unconnected middle position, its outer contacts with terminals 6 and 7, respectively of the control unit 200 and its movable contact is grounded. A light emitting diode or other display device 224 is connected to a terminal 5 of the control unit 200. The display unit 224 is switched on, when an alarm status signal is displayed in the control unit will.

By earthing terminals 6 or 7 via switch 222, different DC voltage levels are applied to terminal 4 created. When the switch is in the position shown, one of the above-described occurs at terminal 4 Hold or "freeze" level corresponding DC voltage on. In the middle position of the switch, which is

ne OFF position forms the locking function corresponding signal level. When the switch is in the lower position, a switch corresponding to the reset is applied Voltage level at terminal 4.

The sensor shown in more detail in Fig. 5 is located in a housing 230 and includes a motion sensor 232, the is connected to terminals 1, 2 and 3 for supplying the supply voltage and the aforementioned ultrasonic signals. The output of the motion sensor 232 is connected to a latch circuit 234 for local display as well as to one Current sink 236 connected. The latter draws power from the SIG in the manner described below Signal wire when an alarm signal is fed to it.

To have such a system with no additional wires require zone identification, the sensor 230 has a clock pulse detector 240, the is connected to a sync pulse detector 242, which is in turn connected to a 4-bit binary counter 244. The latter is also via a line 246 connected to the clock pulse detector and is from this clocked. The same line 246 leads to an input an AND gate 250 with a total of three inputs.

The output of binary counter 244 is a 4-bit size comparator 252 connected, which is adjustable by a binary-coded switch 254 with sixteen positions.

During operation, the clock pulse detector takes the negative Parts of the signals occurring on the signal wire that correspond to the start of a hold pulse. Latter are generated periodically in the present system. The output of the clock pulse detector 240 becomes the Synchronous pulse detector 242 is supplied, which generates a long hold pulse for resetting the 4-bit binary counter 244 determined. The signals from the clock pulse detector are

also fed directly to the binary counter 244 and form its counting clock.

The clock pulses determined by the pulse detector 240 are fed to the counter 244 via the line 246 as clock pulses, the sync pulse detector 244 only providing a signal when a long sustain pulse is transmitted.

The 4-bit size comparator 252 operates in the following way: When the output of the 4-bit binary counter 244 corresponds to the code, which is preselected by the binary-coded switch 254, an output signal is on via the line 256 the AND gate 250 released. Another input to AND gate 250 is from the output of the latch 234 formed for the local display, the occurrence of which is indicative that at the relevant Sensor alarm condition exists. The last-mentioned signal is sent to the AND element 250 via a line labeled 260 transfer.

If a clock pulse occurs at the same time, the corresponds to normal periodically generated sustain pulses, an output pulse of the 4-bit magnitude comparator and an alarm signal at the AND gate 250, the latter is activated and draws current from the terminal 3 of the sensor. Through this a negatively directed voltage is created, which is superimposed on the 26 kHz signal on the signal wire. this happens by a 10 K resistor 260 connected between terminals 2 and 3 of the control unit and one between the output of the AND gate 250 and the terminal 3 of the sensor switched 1 K resistor 264. This is on Alarm signal not only on the signal wire at terminal 4 of the control unit but also on the 26 kHz wire terminal 3 of the control unit.

The zone identification that works without additional wires to be laid the control unit for the location designated by 300

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display is connected to the original control unit via terminals 1, 2 and 3 as shown. The original) Unit 220 is omitted and terminals 5, 6 and the control unit are connected to terminals 4, 5 and 6 of the location display 300 connected. The location display 300 has a total of six terminals and is connected to six terminals of the control unit tied together. It is often appropriate to place the location indicator near the control unit. It's an additional one Feature that the location display via a six-wire cable leading to the control unit at another point of the System can be arranged. Since the wires connected to terminals 1 to 3 belong to the four wires that make up the control unit to connect the sensors, only three additional wires need to be connected between the control unit and the location display be relocated, if the latter is not arranged in the immediate vicinity of the control unit anyway.

The location display 300 is supplied via terminals 1 and 3, which are connected to an internal power supply 203 of the Lead display. This means that terminals 1 and 2 of the location display are connected to terminals 1 and 2 of the control unit.

Terminal 3 of the location display is connected to terminal 3 of the control unit connected and is used to record alarm signals. For this purpose, one is connected to terminal 3 of the location display Pulse detector 304 is provided which senses the aforementioned negative voltage on the 26 kHz line. The pulse detector 304 includes conventional filter circuits as well as a threshold detector.

The output of the detector 304 is over a line 306 is supplied to an addressable latch circuit 308, which via a 4-bit binary counter 310 of the same The type of 4-bit numeric counter 244 can be set in the sensors is. The output signals of the addressable interlock circuit 308 are fed to a 15 zone LED display 312.

- sr

The location display unit is powered by a 1 Hz clock 314 operated with a duty cycle of 10%. The output signal of the clock generator 314 clocks the 4-bit binary counter 310 and is also connected to addressable latch circuit 308. The output of binary counter 310 is fed to an AND gate 316 with four inputs, which generates the sync pulse, i.e. the extended hold pulse supplies »The latter is fed to an OR gate 322 via a line 310. The output of clock 314 is also fed to the OR gate 322 via a line 324, the output of which is connected to terminal 5 of the location display connected is. This terminal 5 is in turn connected to terminal 6 of the control unit. The connection wire in question forms the holding impulse wire = if over this Hold pulse wire the regular clock pulses are sent, the three level voltage source 21ü generates regular hold pulses which form the clock pulses for the 4-bit binary counters 244 in the sensors. The 4-bit binary counter 310 and the 4-bit binary counters in the sensors are incremented simultaneously by the hold pulses.

The location indicator 300 also has a location indicator control switch 330, the individual switching positions of which correspond to the generation of reset, locking or holding signals. The output of this switch 330 is with a switch interface 332 connected. Typically, the location indicator control switch 330 is in the lock position. In this position, no signal is fed to terminal 6 and the clock pulses formed by the hold pulses are used for the successive actuation of the sensors from terminal 5 of the location display 300 to terminal 6 of the control unit transfer. When the entire system is to be reset, switch 330 is toggled so that the Terminal 6 is grounded. The ground potential is triggered, however, when the output signal of the OR gate 322 is low Has voltage level, so that clock pulses continue to be transmitted via the signal wire. If the system is in the

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Hold state, i.e. to be "frozen", the switch 330 is switched to the hold position, whereby the clock 314 is stopped, i.e., "frozen". Afterward a continuous sync pulse is generated which resets all counters to 0.

From those shown in the lower right area of FIG It can be seen from the timing diagrams that initially a long hold pulse appears, which resets the counter. Afterward a signal with locking level appears, followed by clock pulses. This in turn is followed by another signal with locking level. After 16 holding pulses have been generated, one is formed by an extended holding pulse Synchronous pulse generated. The system can be reset at any time by a reset signal. As from the Drawing can be seen, the reset signal is interrupted by clock pulses. The clock pulses can be the reset pulse "dub" so that the clock of all counters is maintained while the location display is locked is postponed.

The stop impulses are chosen as the system clock because they do not reset the location display or the walking test do not noticeably affect the system if they are short compared to a perceptible response the location display. The reason that the negative components are chosen as clock pulses is that originally the negative components on the signal wire are used to freeze the display. Temporary Freezing the location display does not affect the walk test in any way as long as it is kept short enough will be, for example, of the order of 100 ms, as shown in the timing diagram.

The synchronizing signal is used to reset the counters that are used for the display without specially provided return lines be used. This display works independently of

the local display lock and is used to remotely display the locking status without the functions intended for the original system being disturbed in any way .

The reset pulse is used to reset the position indicator lock, while the sync pulse to reset the counters for the zone identification without return lines serves. The sync pulse occurs after every 16 clock pulses and resets the counters. This ensures that a possible interference impulse that is interspersed in the system, the function of the remote displays at most can interfere with one of the counter cycles controlled by the clock pulses. Hence everyone will Binary counter cycle ended by a reset pulse, before a new one begins, which is sure to be in sync again.

An important feature for adapting the zone identification without return lines to the system described above consists in the fact that the hold signal is used several times. Originally, the stop signal was used to control the entire system "freeze" so that a walk test can take place. In the present In this case, the hold signal is still used for the same purpose by the pulsed control of the hold signal, however, it also serves as a clock pulse for return-free zoning without affecting normal operation the original unit is affected. That means, that the hold pulses even if the display lock is reset, neither the reset1 process for the Location display interlocks still impair a visible display while inspecting the system. Another one An important feature of the retrofit system described is that the original sensors in which no precautions have been taken for return-free zoning, can be connected to the system, if a jerk-free zone identifier for a given situation

. * - »■■■ ■ ■ ³¹²⁰³ °

drawing is not required. This is because the original "Hold", "Lock" and "Reset" functions regardless of the fact that the hold level temporarily occurs in the locking state, and not disturbed even without taking into account the fact that the hold level occurs temporarily during the resetting will.

Simple sensors, i.e. those that are not used for central zone detection can also be connected to the cables of the retrofitted system will. Your local display lock 234 works in the usual way without the sensors on the • Signals react to the existing ones for the central zone detection, which works without additional lines Lead wires are given.

A system with extended performance features will be described below with reference to FIG. It is again a four-wire system that not only provides extended alarm and security features, but also for the retransmission 'of analog data collected at a remote location to the control unit is suitable. The control unit of the system is labeled 400. It includes an -e Power supply 402, a voltage source 404 with three different Voltage levels, a 26 kHz oscillator 406 and a second voltage source 408 with three voltage levels. These components are connected to terminals 1, 2, 3 and 4 of the control unit 400. To terminal 4 of the control unit a signal current sensor 410 is also connected, which via an analog-to-digital converter 411 with a Microprocessor interface 412 is connected. The microprocessor interface 412 is via control lines with the Dreipege1 voltage source 404, the oscillator 406 and the Three-level voltage source 408 connected. The microprocessor interface 412 is connected to a microprocessor 414, the data transmission capacity in both lines

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is 8 bits . A display 416 is connected to the microprocessor 414. In a preferred exemplary embodiment, the microprocessor 414 is an Intel 8080. A plurality of sensor / actuator units is connected to the control unit 400. These units, of which the unit designated 420 is shown in more detail in the drawing, are also referred to below for short as sensors . The sensor shown has four input terminals that are connected to the ground wire GND, the V + wires or the control signal wires C and S. A high signal level detector 422 and a low signal level detector 424 are connected to terminal 3 of the sensor, the outputs of which are connected via AND gates 425 and 427 to the set input and the reset input of a relay interlocking circuit 426, which in turn is connected to a relay 428. The AND gates 425 and 427 are activated by the output of an address counter 442 in the manner described below when the sensor 420 is addressed. The relay 428 is connected to a local setting or operating device 430. Activation of the corresponding device 430 is controlled by the activation of this special relay. For example, the relay can be used to switch motors, lamps, etc. on and off.

With the signal wire connected to terminal 4 of sensor 420, there is a clock pulse detector 440 for positive Clock pulses connected, the output signal of which forms the clock input of the address counter 442. To the detector 440 a detector 444 for reset pulses is also connected sen, which is responsive to the elongated pulses mentioned above and resets the address counter 442. The exit of the counter 442 is connected to an AND gate 446 via a switch pin placed in a suitable manner. The other input of this AND gate 446 is connected to a detector 448 for negative clock pulses, which is also connected to the signal wire connected to terminal 4

^312O3C

is closed.

During operation, the detector 440 receives the positive clock pulses and controls the counter 442 with them. The The said switching pin connects the output of the counter 442 assigned to the special sensor to the AND element 446. When the counter 442 reaches the output corresponding to this switch pin, the sensor is addressed. If then a negative clock pulse occurs on the signal wire, it is picked up by the detector 448. At the same time The occurrence of the corresponding output signal of the counter 442 and a negative clock pulse becomes an auxiliary counter 450 advanced. If the control unit should read out the special sensor and if more than one type of data is to be read from the addressed sensor, the positive clock pulse at the input of the AND gate 446 is maintained. A series of negative clock pulses is then generated so that the output of AND gate 446 den Auxiliary counter 450 switches on. The only way to maintain the positive clock pulse at the input of AND gate 446 to obtain is to prevent the signal value of the clock pulses during the required period of time returns to the value 0. This is detected by the clock pulse detector, which stops the counter 442, so that a high logic level signal is available when stopped. This high logic signal level is fed to AND gate 446.

The auxiliary counter 450 serves various purposes. First, he can indicate an alarm condition from the detector 452 recorded, held in the interlock circuit and in the AND element 456 with the zero output of the H ι 1 f s ζ ei h 1 e r s 450 is linked. The output signal of the AND gate 456 is fed to an OR gate 460 and identifies the alarm state. When the counter 450 is reset its zero output has a high signal level. Thus, each detected by the detector 452 and in the

Latch circuit 454 applied alarm condition to OR gate 460. It may be desirable to use the sensor then to determine which Type of alarm it is or on what basis it was generated. For this purpose a switch pin is between an output of the auxiliary counter 450 and one of the inputs of the OR gate 460 placed. If the special sensor for example includes a burglar detector and differentiated from a fire alarm detector, for example is to be, a switching pin between the corresponding output of the counter 450 and an input of the OR Link 460 placed. In this way, the type of alarm state can be determined after an alarm state has been signaled by the coincidence of a second output signal of the OR gate 460 is evaluated with a certain incremental pulse for the auxiliary counter 450.

The output of the OR gate 460 is a voltage to current converter 462, which consists essentially of a controllable current source, which is the to the Control unit leading signal line draws power. This current draw is arranged in a in the control unit Signal current sensor 410 established and via a Analog-digital converter 4.11 is supplied to the microprocessor interface 412 as an input signal. This signal is used in in the manner described below with register states time-related in the microprocessor, whereby these register states indicate the address of the sensor, in which the alarm condition occurred and the type of alarm condition.

If the sensor is also one of several local analog To determine state variables, the payer 450 can add to the outputs characterizing the alarm states further outputs, in the present case to outputs 9 to 12, which are switched one after the other 470, 472 and 474 and activate recorded analogue

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couple data to another voltage-current converter 476 from where they are transmitted back to the control unit.

The three-level voltage source provided in the control unit 400 404 can generate three different signal levels, shown in the diagram labeled C on the left the lower area of FIG. 6 are indicated. These signals are used to control the relay 428. In the illustrated embodiment Signal wire C transmits a 26 kHz square carrier wave, whose mean value is + 0.5 V + level, i.e. half the value of the supply voltage V + that is applied to terminal 2 of the control unit. That The occurrence of this carrier wave with an average value of 0.5 V + indicates the idle state of the signal. To activate the relay latch circuit 454 must be the three-level voltage source 404 deliver their high level value. The mean of this high level signal is 0.8 times of the supply voltage V + and is picked up by the high level detector 422, which is the relay latch circuit 426 activated. This energizes the relay for the desired control function.

To reset the relay 428, a Voltage with an average value of 0.2V +, which is detected in the low level detector 424, and fed to the reset input of the relay latch circuit 426 is applied. This deactivates relay 428.

The signaling via the S-wire is also done by signals from a three-level voltage source, namely the voltage source 408, but the control functions are different. It can be seen from the time diagram labeled S that both positive and negative pulses are used as clock pulses Find use. The positive pulses are for the address counter 444 and the negative pulses are for the auxiliary counter 450 determined. Prolonged positive or negative error

pulses are used as reset pulses, while short Pulses can be used as clock pulses for these counters.

A positive reset pulse is sent to the S-wire during operation of for example 64 ms duration applied. This will reset all address counters in all sensors. A pulse follows the positive reset pulse from 4. ms duration, which in the example has the level value 0.5 V +. During this time, data belonging to the zone area may be zero are transmitted back via the signal wire, if any. After a dead time, which is 4ms in the example, a clock pulse is applied to the S-wire, which corresponds to the address of the first sensor. This clock pulse is 2 ms long. After this first clock pulse, there is another dead time of 4 ms, during which data is transmitted back via the S-wire can be. So a series of positive pulses is generated until a special sensor is addressed, its information should be queried. At this point in time, there is an extended reset pulse that is negative with respect to the signal mean value applied to the S-wire, which is followed by a series of negative clock pulses, which are fed to the auxiliary counter 450 whereby the data determined by one or more switch pins are read out. Reading out the Data takes place between the generation of the negative clock pulses during a dead time of 4 ms.

However, this time may be too short for the transmission of analog data. To adapt to the requirements for the Transmission of analog data, the positive clock pulses can be suppressed, so that the required for the purpose Number of negative clock pulses can be accommodated. The negative clock pulses can be selectively suppressed to enable the transmission of analog data. The 4 ms duration between the positive or the negative iaktimpuls is in general a minimum time. The system can thus be operated in two different ways. First of all, positive clock

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impulses with predetermined! Time interval are sent out, taking negative pulses between two positive clock pulses are inserted without positive clock pulses being suppressed. Alternatively, a special sensor can be addressed in this way be that a given number of positive clock pulses are generated and then the positive clock pulses are suppressed until all required Data have been read from the relevant sensor. The first case corresponds to a scan of all sensors while the second case corresponds to addressing a sensor and then reading out all necessary data. While generally an interpulse time for the positive Pulses of, for example, 25 ms to adapt to the can be provided in the worst case, these intermediate pulse times for a more eified system in which a ge the sensors do not need such a long time for the information output to be shortened accordingly.

The signaling system described above allows the transmission and reception of large amounts of data with four Signal cores. While there is one control unit per system the number of sensors is comparatively large. It is therefore important to set up the sensors as efficiently as possible, so that the largest amounts of data desired are transmitted and can be adapted to a wide variety of different situations.

BATH ORIGINAL

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Claims (1)

Claims • Zone identification system for a monitoring system with a number of sensors and a multi-core connecting cable for connecting a monitoring point to a monitored point,
marked ic h η e t ■ by - A control unit arranged in the monitoring point (10) with a counter (32) which has a plurality of outputs individually assigned to the individual counter readings and supplies an output signal at one of these outputs with each counting step, as well as with a device (34) for clockwise incrementing of the counter (32) with a first series of clock pulses and for applying this series of clock pulses to the multi-core connecting cable (42, 64), - A sensor ("^ arranged in the sensor connected to the multi-core connecting cable (42, 64) at the monitored point further counter (30), which corresponds to the first-mentioned counter (32), through which the multi-core connecting cable (42, 64) applied series of clock pulses can be advanced simultaneously with this and also provides an output signal at each counting step at one of a plurality of outputs, - A device (26), arranged in the sensor (12), for generating an information carrier signal, which upon occurrence responds to a predetermined state at the location of the sensor (12), - A device (48) arranged in the sensor (12) which upon occurrence of a predetermined output signal of the further counter (30) responds and the sensor (12) for applying the information carrier signal to the multi-core Connection cable (42, 64) activated for transmission to the control unit (10) - As well as a device arranged in the control unit (10) (68, 70, 72) when the information carrier signal is transmitted via the multi-core connection cable (42, 64) and a corresponding output signal of the first-mentioned counter (32) responds and the presence and determines the content of the information carrier signal, the location of the respectively transmitting sensor (12) by the count of the counter (32) arranged in the control unit (10) at the time of the transmission of the information carrier signal to the control unit (10) is intended. 2. Zone identification system according to claim 1, characterized by d a d u r c h, - That in the control unit (400, Fig. 6) a device (404) for applying a control signal (0.8 V +) to the Multi-core connection cable (core C) depending on the determination of the specified information carrier signal is provided - and that in the sensor (420) a detector device (422, 425) for receiving this control signal (0.8 V + at Core C) and for generating an activation signal in Depending on the reception of the control signal and the previous one Activation of this sensor (420) is provided. 3. Zone identification system according to claim 2, characterized characterized in that the detector device (422, 425) provided in the sensor (420) is dependent on the simultaneous occurrence of said information carrier signal and the corresponding output signal of the in responds to the counter arranged in the control unit (400). 4. / orif-nkpnrizeichnunqssystem ridch one of the preceding Claims, characterized in that - That in the control device (400) a device (408; is provided for generating a second series of clock pulses, which in the first-mentioned series of clock pulses is inserted and distinguishable from this, - That in the sensor (420) a second with the multi-core BATH ORIGINAL Connection cable (wire S) connected meter (450) is provided, which when this sensor (420) is activated responds to the second series of clock pulses and successively generates output signals at the outputs assigned to the individual counts - and in that the sensor (420) further comprises means (460, 462) is provided for generating said information carrier signal responsive to the occurrence of a predetermined output signal of the second counter (450) such that an output of the first-mentioned counter (442) of the sensor (420) identifies the latter as the activated sensor (420) and the second counter (450) of this sensor (420) determines the information to be transmitted. Zone identification system according to claim 4, characterized in that said detector device (422, 425) as a function of the output signal of the counter in the control device assigned to the relevant sensor (420) (400) responds when the transmission of said information carrier signal in this output signal that between two consecutive pulses of the first Series of clock signals lying interval follows. Zone identification system according to Claim 5, characterized in that means in the control device (400) are provided for the suppression of pulses within the first series of clock pulses and that within the information obtained by this suppression from a predetermined sensor (420) to the control unit (400) are transferable. Zone identification system according to claim 1, characterized in that in the control unit normally a rest signal applied to the multi-core connecting cable and intended for all sensors is generated and that this rest signal can be modified such that the first Series of clock pulses arises. ^ 31203C 8. zone identification system according to claim /, characterized characterized in that said rest signal causes a current to flow to the sensors and that the modification of the Rest signal includes the generation of voltage pulses. 9. zone identification system according to claim 4, characterized in that a normally in the control unit a certain rest signal is generated for all sensors connected to the multi-core connecting cable, which can be modified in different ways to deliver the first and second series of clock pulses. 10. Zone identification system according to claim 9, characterized in that the rest signal has a current flow to the includes said sensors and that its modification includes the generation of positive or negative voltage spikes and that the first or the second series of Clock pulses are generated depending on the sign of these voltage peaks. 11. zone identification system according to claim 2, characterized in that the control signal includes a carrier, for performing a predetermined control function in its amplitude in a predetermined direction is movable. 12. Zone identification system according to claim!, Characterized characterized in that the control unit has a device for generating a reset pulse after each counting cycle implies that this reset pulse has a longer duration has as each pulse of the first series of clock pulses that means are provided by which the first series of clock pulses can be separated from the associated line core and instead the reset pulse can be applied to this lead wire and that in the sensor (420) one connected to this lead wire (S) Detector (444) for receiving the reset pulse and to reset the counter (442) when the Reset pulse is provided. 13. Zone identification system according to claim 1, d a d u r c h characterized in that the information carrier signal information conveyed in the form of a current flow over one of the cores of the multi-core connecting cable and that the control unit Contains means for monitoring the flow of current on this wire. 14. Zone identification system according to claim 13, characterized characterized in that in the sensor a detector means (e.g. 452, Fig. 6) for detecting an alarm condition as well as means (462) responsive to the detection of such an alarm condition are provided through the line wire (S), the current flow of which is monitored (by means of 410), can be connected to earth potential. 15. Zone identification system according to claim 13, characterized characterized in that a monitoring device for monitoring a predetermined state as well as in the sensor Means for influencing the amplitude of the current flow are provided depending on the monitored state. 16. Zone identification system according to claim!, Characterized characterized in that the sensor has means for detecting an alarm condition and a local display device for Indication of the occurrence of the alarm state implies that the display device can be locked when the alarm condition occurs and by the occurrence of a predetermined one Level value of a clock pulse of said first series of clock pulses is freely switchable. 17. Zone identification system according to claim 16, characterized characterized in that in the control unit means for suppressing the connection of said predetermined pe- - «£ - ■ / ■ ³¹²⁰³ gel values are provided such that the local display device can be inspected in one sensor without disturbing normal indexing and other sensor operations is. 18. Zone identification system according to claim 1, characterized by d a d u r c h, - that a switchboard with a plurality of pairs of terminals is provided in each sensor, - That one terminal of each pair of terminals is connected to one output of a counter (442) of the sensor (420) is, - That an actuating device (430) is provided which can be connected to the other terminals of all pairs of terminals - And that a switching pin for connecting a selected copy of the outputs of the counter (442) with the assigned other terminal of the relevant pair of terminals is provided, so that the sensor (420) through Placement of the switch pin is adjustable so that he responds at a predeterminable count. 19. Operating procedures for a monitoring and / or control system - with one arranged at a central monitoring point Control unit, - With a plurality of arranged in different places Sensors - as well as with a multi-core connection cable via which the sensors are connected to the control unit, for zone marking at the location of the control unit and thus for identifying the sensor from which information is transmitted back to the control unit, without the use of additional wires,
characterized by the following steps: - The control unit and sensors are equipped with counters, -V- the counters are incremented simultaneously by a common clock, each sensor is used by a different count of the assigned counter for information retransmission activated in the control unit there are means for determining the counter reading of the counter located there at the time the receipt of the transmitted information and thus the identification of the activated one sending the information Sensor provided.