FR2583552A1 - SECURITY CONTROL SYSTEM - Google Patents

Abstract

THIS SYSTEM INCLUDES 12 INPUT DETECTORS TO DETECT INTRODUCTIONS IN INPUT PASSAGES, AT LEAST ONE DEVICE 18 FORMING SIGNAL TRANSMISSION RELAY CONNECTED TO THE ALTERNATIVE CURRENT ENERGY SUPPLY LINE AND INCLUDING TRANSMITTER RECEIVER MEANS IN THE LINE AND MEANS OF CODING AND ENCODING OF SIGNALS, A CONTROL DEVICE 20 IS CONNECTED TO THE LINE AND INCLUDING TRANSMITTER-RECEIVER MEANS IN THE LINE AND MEANS OF CODING-ENCODING OF SIGNALS, SLAVE DEVICES 22, 24, 26 CONNECTIONS AND AN ALARM DEVICE FOR COMMANDING THE ACTIVATION OF THE LATTER AND INCLUDING TRANSMITTER-RECEIVER AND SIGNAL CODING-DECODING MEANS, THE VARIOUS TRANSMITTER-RECEIVER MEANS BEING RESPONSIBLE DURING DETECTION OF AUDIO CODED SIGNALS. APPLICATION IN PARTICULAR TO ANTI-BURGLARY SYSTEMS.

Description

83552

  The present invention relates to

  security control and in particular the communication systems

  safety devices intended to be installed in buildings

or in dwellings.

  Most conventional security systems fall into two main categories:

  wireless and cabled systems. Wireless systems used

  typically read ultra-high frequency

  or radio frequency signals for communicating information from detection devices of an introduction to central alarm systems. Although such systems generally have the inherent advantage

  to be of an easy installation the security systems

  cable-free units tend to be disturbed by a percentage

  relatively high level of false alarms. This is largely due to the congested state of the airspace. In

  Furthermore, since radio frequency

  easily cross the walls or walls of buildings

  buildings and dwellings, this greatly increases the risk that a system located in a building will

  wrong a system located in a neighboring building. To this

  It must be remembered that even a relatively low rate

  false alarms corresponding to a false alarm

  for a period of several hundred hours of use

  may be sufficient to cause a loss of

  confidence in the reliability of the system.

  On the other hand, cabled systems are generally more reliable and less prone to falsification.

  alarms. However, cabled systems require the installation

  of a separate and particularized cabling system, which has the effect that such systems are priced

  unaffordable for most consumers.

  This is why an object of the present invention

  is to provide a perfect safety control system

  which is reliable, relatively cheap and simple

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to install.

  Preferably a security control system according to the present invention combines a communication

  wireless and communication via

  existing energy supply systems in a building

or a dwelling.

  The safety control system according to a

  preferred embodiment of the present invention

  takes an input detector, a signal transmission relay module, a control device and a slave module. The input detector is powered by

  battery and is adapted to be mounted at the level of each

  te and window of a dwelling or a building. During

  the opening of a protected door or window, a sign

  The audible encoded signal is output from the input detector. The

  encoded audible signal is received either directly by the

  positive if it is located close enough

  close to the active input detector, either by means of a

  dule forming signal transmission relay. This module

  forming a relay is adapted to be connected to the

  calf of a conventional wall socket and is intended to be placed in each room or space of the dwelling or building, in which an entrance detector is located. A single module forming a signal transmission relay is

  required in each room or space, regardless of the name-

  number of input detectors in this room or room

  space. The function of the relay relay module

  signal mission is to receive the audible signal

  code transmitted by the input and output detector, in response to

  to this signal, a digital signal coded by a coding of

  pulses, to the control device via

  power supply lines. The communication device

  is also adapted to be connected in

  a standard wall outlet and is adapted to receive

  see and transmit digital signals encoded according to a

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  encoding of pulses, via the power supply lines

  in addition to being able to directly receive coded audible signals from a

  input detector, as mentioned previously

  is lying. In response to receiving a signal arriving either

  directly from an input detector, ie from a

  As a signaling relay, the control device is adapted to transmit a coded digital alarm signal according to a pulse code, via the power supply lines to the slave modules. The slave modules are connected to

  similar way in wall outlets and serve to

  order the activation of different loads, such as an alarm, a siren or a lamp or to order

  performance of a specified task, such as

  dialing a telephone dial. In addition, the control device can selectively address individual slave modules so as to provide

  a user the possibility of remotely controlling the

  lamps and apparatus or other loads of this nature. Thus the control device according to the present invention allows the system to function as a security system or as a remote control system.

  When it works as a system of se--

  the present system has two fundamental modes of

  operation: INSTANT BREAK and DELAY DE-

  Tripping. In INSTANT TRIP mode, the

  Positive control is programmed to operate

  an internal alarm and to send an alarm signal to the

  slaves so as to immediately activate the

  alarm devices when receiving a signal of

  trusion. This mode of operation is intended to be

  for example when a home is occupied at night and the landlord wishes to be informed instantly

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  an attempt to unintentional intrusion. On the other hand,

  DELAY DELAY mode is used when connecting

  the system before leaving the protected premises so that, when it returns, the owner disposes, once he has again entered his home, a predetermined period of time during which he may enter a secret code of in the control device to inhibit the actuation of the alarm. Unlike conventional security systems, in which this delay function is implemented in the control device, in the present system the delay function

  is contained in slave modules located remotely.

  More particularly, in the case of the DELAY DELAY mode, the control device is programmed to transmit, when receiving an intrusion signal, a coded signal in the power supply lines in the direction of slave units located at a distance, said

  signal that triggers a digital timer.

  in each slave unit. Once triggered,

  slave units automatically activate their char-

  respective tasks or perform their respective tasks at the end of the predetermined period of delay, unless

  that an invalidation signal is received from the

  control system through the supply lines.

  energy supply. The control device is pro-

  grammed so as to send this invalidation signal when

  the introduction of a secret code chosen by the user

  tor. Therefore, it should be noted that the present system can not be disabled by a thief simply unplugging or disabling the controller during the delay time period provided in the DELAY mode.

TRIGGER.

  An important additional feature of the present safety control system is the

  single coded audio communication link between the

  input headers and relay modules

  signal mission and control device (s).

  In the preferred embodiment, the coded audible signal transmitted by an input detector upon detection of an intrusion includes bursts of alternating tones.

  at 6 kHz and at 7.3 kHz, two successive bursts of

  are located at a predetermined spacing to eliminate echo problems. The choice of particular frequencies used in the coded audio link is

  essentially based on the conditions of release

  (1) audible signals provide the owner with

  a degree of guarantee that the input detector / transmitters are functioning properly, (2) the use of signals within the audible frequency range

  significantly reduces the risk that a triggering system

  erroneously of neighboring systems, and (3) the degree

  relatively low natural occurrence of these frequencies.

  these. The audio receivers present in the modules

  forming a signal relay and in the

  Positive control operate in accordance with the principal

  eg constant false alarm rate ("CFAR"), which effectively isolates the coded signal from noise

  ambient and thereby to control in a predictable way

  the probability of occurrence of false alarms and to provide a predictable signal-to-noise ratio. The audio receivers also include a unique decoding circuit which uses the exclusion principle through a sequential search for the simultaneous presence of the 6 kHz tone and the absence of the 7.3 kHz tone, followed by

  simultaneous presence of the 7.3 kHz tone and the absence of

  this of the tone at 6 kHz. The result of these characteristics

  combined ticks is an audio communication link

  highly reliable, which actually eliminates the risk of

his alarms.

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  Similarly, an important element for the safety control system according to the present invention is the power line communication technology, used to reliably transmit information between the signal transmission relays,

  the control device and the slave modules. The infor-

  transmission is transmitted between the relay, the

  and the slave modules through the li-

  energy supply, thanks to the introduction of a

  relatively high carrier frequency signal (e.g.

  121 kHz) in the power supply lines.

  The transmitted messages are in numerical form

  encoded pulse code, in which the bits indicate

  data are represented by a gust of

  carrier or "pulse", which is produced during the predetermined time intervals of the 60 Hz AC waveform. Specifically a "binary 1" is represented by a pulse produced during the first half of the form. waveform at 60 Hz and a binary "0" is represented by a pulse

  produced by the second half of the waveform to

  alternative. Thus we obtain synchronization

  be the different units thanks to the synchronization of

  transmission and reception of digital signals co-

  impulse coding on the wave-to-wave wave

  alternatively at 60 Hz. In addition, in the form of

  preferred embodiment of the present invention, the modules

  relay signal relay or devices

  are designed to work with a micropro-

  and include programmed algorithms for controlling the AC power supply line prior to sending a message to determine if another device is already transmitting a message or if there is an unacceptable level of noise in the AC power supply line,

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  which could prevent reliable transmission and reception

  of a message. If the presence of information or

  Invalid noise calf is detected, devices are programmed in a manner & apply a product delay randomly before attempting any retransmission. In this way, the potential conflict of priorities for access to the power supply lines is resolved and the likelihood that devices will create a state of

Perpetual conflict is avoided.

  In order to prevent the safety control device from being rendered inoperative by the failure of the AC power supply, the units present in the system, which are based primarily on a power supply by means of an energy of AC power supply - namely the transmission relay

  signals, the control device and some of the

  slaves - each equipped with a feeding system

  battery backup power which is displayed on the

  automatically when the primary primary power supply

  alternative is failing. These units also include

  internal crystal oscillator circuits

  quartz or ceramic resonator, which are used to de-

  to deliver to the units precise timing

  these units to communicate asynchronously when

  primary power supply with alternating current

  tif is absent. These internal timing circuits provide

  also determine the carrier frequency used for

  communication in the power supply line.

  Other features and advantages of the pre-

  invention will emerge from the description given below.

  after reference is made to the accompanying drawings, in which: - Figure 1 is a schematic illustration of the safety control system according to the present invention, showing the various components of the system and their interrelationship in a typical installation;

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  FIG. 2 is a timing diagram illustrating the forms of communication data codes in the power supply line;

  FIGS. 3A and 3B are timing diagrams

  glossing the message formats delivered by the relay modules;

  FIGS. 4A, 4B and 4C are chronograms

  illustrating the formats of the message delivered by the

positive order;

  FIG. 5 is a diagram of a circuit of the

  dule forming emitter of the input detector;

  FIG. 6 is a timing diagram of the signal

  coded diode emitted by the emitter module of the input detector;

  FIG. 7 is a diagram of a circuit of the

  dule forming relay; FIG. 8 is a sectional view of the mechanically tuned audio ports present in the relay module casing;

  FIG. 9 represents a more detailed circuit

  and a block diagram of the CFAR receiver present in the cir-

  a standard built-in oven housed in the relay module

  in FIG. 7; FIG. 10 represents the block diagram of a

  circuit of the PLC transmitter part of the integrated circuit

  usual use of the relay module and the control device, shown in respective figures 7 and 12; FIG. 11 is a block diagram of the receiver part PLC of the usual integrated circuit of the module

  relays of the control device, respectively represented

  in Figures 7 and 12; - Figure 12 is a diagram of a circuit of a part of the control device; and - Figure 13 is a diagram of a circuit of a

  slave module of the control device of a lamp.

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  -When we will give a detailed description

  of the preferred embodiment of the invention.

  Referring to Figure 1, there is shown

  a schematic view of the safety control system

  in accordance with the present invention. The present

  vention is able to function both as a system

  control system and as a security system. Lors-

  that it is used as a security system, the present invention makes it possible to detect an introduction at any protected door or window and

  to perform a variety of functions in response to such

  detection, including the triggering of an alarm, the

  tivation of an outdoor siren, lighting and / or

  or the validation of an automatic tele-

  phonic. In general, the security system includes the

  input detector 12, the module 18 forming a transmission relay

  signal mission, the controller 20 and the slave modules 22, 24 and 26. An input detector 12 is adapted to be located at each point of introduction into the protected premises. Thus, in a domestic installation, it is preferable to locate an input detector 12 at each door and window in the dwelling. The input detector 12 comprises a module 14 which contains an audio transmitter as well as a sensor switching circuit serving to

  order the validation of the circuit of the audio transmitter.

  In the preferred embodiment, the detector of

  12 comprises a permanent magnet 16 which is adapted to be mounted on the door or on the window in the vicinity of the transmitter module 14. Thus, when one opens

  the door or the window, the movement of the magnet 16

  module 14 actuates the sensor switch

  transmitter module 14, which activates the cir-

  cooked audio transmitter. As the technical specialists

  that will easily understand, we can easily replace

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  the magnet and the vacuum blade switch type sensor, used in the preferred embodiment, by

  other types of devices for detecting an introduc-

  to provide a command signal ON /

STOP.

  When the input detector 12 detects an in-

  troduction, the audio transmitter module 14 is adapted to

  produce an audible coded signal that is received either directly

  by the control device 20, or by means of a modu-

  the 18 forming signal transmission relay. The role

  of the relay module 18 is to retransmit the signal of

  trusion from an input detector 12 through the medium of

  re power supply lines 30 to the device

  20. The relay modules are installed

  simply connecting the devices to

  conventional wall outlets at 120 volts AC.

  Therefore, in a typical home installation, a relay module 18 is required in each room or open space, in which an input detector 12 is disposed, except for the controlled input detectors 12

  directly by a control device 20.

  The control device 20 of the system is suitable for

  in a similar way to be connected to a

  classic 120 volt AC power supply. In addition to decoding coded intruder audio signals from directly controlled input detectors 12, the controller also receives and interprets coded signals from the power supply transmission line from the signal modules. relay and transmits coded instruction signals through the

  energy supply lines 30 towards the different

  the slave modules 22, 24 and 26. The slave modules

  22, 24 and 26 are similarly adapted to be branched into the wall outlets and comprise either lamp modules 22 or appliance modules 24 or

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  alarm modules 26, depending on the particular load

  order to be ordered. Any number of

  Slave dules can be distributed throughout an entire

  dwelling or building. The slave modules receive

  wind the instruction coded signals through

  of the power supply line from the

  positive control 20 and control the power on

  their respective charges in accordance with such

  instructions. This is why, in response to

* ception of an intrusion signal, the control device

  is programmed in such a way as to transmit the

  appropriate tructions through the supply lines.

  in order to control the different modes of

  slaves 22, 24 and 26 to activate their

respective management.

  In addition, it is advantageous to use

  very different types of slave devices, such as

  automatic telephone dialing devices.

  In this regard it will be understood that, when used as a security system, the present invention contemplates the use of any desired type of alarm response device and, therefore, when the we

  refers in this application to an "alarm device"

  this name is meant to include both acoustic and optical alarm response

  other types of alarm response devices

  for example automatic numbering devices

  telephony and the like. It should also be noted that the present safety control system 10 contemplates the use of multiple control devices. In such applications, the occurrence of a change in the operating state in a controller

  is immediately communicated via the

  energy supply systems to the other

  positive control so as to ensure that the state of

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  operation of all the control devices of a

  system is kept the same. In addition, even if a new

  code is established for a system and is introduced

  in a control device, the new code se-

  cret is transmitted automatically via

  power supply lines to other

control system.

  This security system is triggered at

  choice in a control device 20 either for the function

  INSTANT TRIP, ie for the function-

  TRIP DELAY, this last operation

  allowing the occupants to exit and re-enter

  calf in the protected area without triggering the alarm. In

  particularly in the mode DELAY OF OPERATION, the

  The owner has two minutes to exit the room after the system is switched on and has, once

  that he has re-entered the local.protected, of 40 se-

  condes, during which he must introduce a se-

  INVALIDATION crest in a controller 20 to invalidate the alarm sequence. What is important,

  is that the mere invalidation of a communication device

  20 in the 40-second delay period does not

  not allow slave modules 22, 24 and 26 to activate their

  respective charges as a result of the expiration of this

  later. As will be explained later in more detail, this is achieved by providing in the slave modules 22, 24 and 26, an internal clock circuit which involves the delay period of 40 seconds as a result of

  receiving a regressive count signal from

  nance of the control device 20. So, to talk about

  practical way, the slave modules 22, 24 and 26 between

  break their timer function only during

  ception of an INVALIDATION signal delivered by the device

  20 through the feed lines

energy supply 30.

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  In addition, the control device 20 and the modules

  Slave dules 22 and 24 of the present system 10 can also be used as a central control system for remote control of different lamps and apparatus. Specifically, the control signals delivered by the control device

  and transmitted via food supply lines

  energy supply 30 include an address code or a unique

  as well as a code of instruction and the various

  the slaves are programmed in a unique way

  signals with a unit code corresponding to the address assigned to them in a unique way. Thus the control device 20 can operate at the

  choice the different loads connected to the modules es-

  claves 22 and 24. For security and financial reasons,

  the relay modules 18, the

  20 and the slave modules 22, 24 and 26 are

  also associated with a dwelling code that prevents

  communications from a system through

  of energy supply lines does not

  an undesired response in a neighboring system. The co-

  of dwelling associated with the system 10 is transmitted as part of each coded signal transmitted via

  power supply lines 30.

  COMMUNICATION FORMATS IN THE POWER LINES

IN ENERGY (PLC)

  Before proceeding to the detailed description of

  different devices in the system, it is necessary to

  just understood the communication formats in the power supply lines, which are used in this system. Relay modules 18 and the

  or the control devices 20 communicate through the

  of energy supply lines in application of

  a relatively high frequency carrier signal

  in the AC line at 60 Hz. Frequency

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  carrier carrier used in the preferred embodiment

  is 121 kHz. The information is transmitted between the different units by means of digital pulse code modulation ("PCM") of the carrier signal. Specifically, and in particular with reference to the figure

  2, the location of the burst of carrier frequency pulses with respect to the 60 Hz AC waveform determines

  the data content of the signal. As illustrated in the timing diagrams of Figure 2, if a burst of carrier frequency pulses appears

  during the first half of the waveform to

  alternating current at 60 Hz, the pulse corresponds to a "1 #

  binary. Conversely, if a burst of pulses at frequent

  this carrier appears during the second half of the

  AC waveform at 60 Hz, the impulse

  respond to a binary "" That is why it will be noted that a complete cycle of the AC Hz waveform is used to transmit each bit of information data in a flowing communication message.

  in a power supply line.

  Additional data formats used in the present embodiment include dual

  mark ("DM"), which includes a burst of frequency pulses.

  carrier during the first and second

  these of the AC waveform at 60 Hz, and the space, which corresponds to an absence of a burst

  carrier frequency pulses during the two alter-

  AC waveform at 60 Hz.

  The DM-given one is used as a preamble to indicate the beginning of a data transmission, since the succession obtained from the carrier frequency pulses during three successive alternations of the form

  alternating current waveform at 60 Hz represents a

  which can not appear during a transmission

  normal data consisting of 1 and 0 binaries.

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  The DM signal code is also used to provide the reference for the identification of the "first" and "second"

  alternations of the AC waveform at 60 Hz.

  Likewise the double space format is used at the end of each message to indicate the end of a transmission of

  data. As will be seen later, this is necessary

  because the different messages used in

  the present system of communication by the lines of

  energy supply do not all have the same

  LATIONS. That's why the end of a data transmission

  must be identified definitively.

  As will be noted further from the chrono-

  gram shown in FIG. 2, the data impulses

  121 kHz carrier signals are triggered at

  level of the points of cancellation in the common waveform

  alternating current at 60 Hz. The duration of each burst of

  frequency pulses is preferably equal to

  a millisecond in a relay message (as shown in

  shown in Figure 2) and at 7.33 milliseconds in a

wise of the control device.

  Referring now to FIGS. 3A and 3B, there is shown the formats of the messages of the modules

  forming a relay of the preferred embodiment. We

  would be obvious that one could use a variety

  almost infinite message format. The present

  were chosen as providing an acceptable compromise

  table between the number of available code selections

  and the transmission bandwidth of the signals. How-

  an important element, linked to the fact that it is not born

  If all messages in the system have the same length, in the preferred system, several message formats can be made much shorter than others, which reduces the bandwidth required for

  such transmissions. In addition, because of the

  the global nature of communication technology through

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  intermediate power supply lines, which is

  used in this system, it is unnecessary to repeat

  send a message to ensure correct reception. The first message format of the module forming

  relay, which is shown in FIG. 3A, is the message

  ALARM that is emitted through the power supply lines to the device

  each time a valid audio signal is re-

  received from an entrance detector. The ALARM code of the relay, which is selected in the preferred system, has two successive double marks. In addition each

  communication through the power supply lines.

  it always contains the issuance of the housing code

  system, which serves to distinguish between

  communications in the power supply lines

  of a system compared to that of another system.

  In the preferred embodiment, an eight-bit dwelling code is used, which provides 28, i.e., 256 possible codes. Following transmission of the dwelling code, the ALARM message ends with a double space. The second message format of the relay module, shown in FIG. 3B, includes the message LOW BATTERY, which is transmitted via the power supply lines to the controller each

  once it has been established that the voltage level of the

  This backup power supply is less than a specified minimum value. The LOW BATTERY message of the relay in the preferred embodiment comprises two

  double consecutive marks, followed by the code of habit

  assigned to the system and the double terminating space

  his. Referring now to FIGS. 4A, 4B and

  4C, the formats for

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  communication commands in the power supply lines for the control device 20. When used as a central control system, the code format of the control device has the possibility of having selective access to individual slave modules

  and order them. The format of the basic message

  A control message for the control device, shown in FIG. 4A, for carrying out the remote control function includes a preamble, consisting of a DM-given one, followed by an eight-bit dwelling code, a four-bit instruction code, a single parity bit, an eight-bit unit code, and the double

  termination space. The state of the parity bit in the form

  preferred embodiment is determined by a certain

  number of bits "1" in the control message of the dis-

  control system; a parity bit "1" corresponding to an even number and a parity bit "0" corresponding to a

  odd number. The four-bit instruction code identi-

  the particular task to be performed by the

  for example include remote control functions such as "unit connection", "unit shutdown", "lamping" etc. The eight-bit unit code

  is used to identify only the desired slave module

  to be ordered. As we will see later

  the description of the lamp module shown in the figure

  13, a slave module only responds to a command message from the control device if the dwelling code and the unit code in the message correspond to the particular dwelling and unit codes preset for

this particular slave module.

  In addition, the control device 20 of the

  preferred embodiment is provided with a communication element.

  separate circuit shown in Figure 4B to connect or disconnect all formed modules lamps, which are present in the system. The format of this command is

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  constituted simply by the preamble, the housing code

  eight-bit instruction, the four-bit instruction code, a

  parity bit and double space. Since the com-

  Mande is intended to have access to all modules of the lamps present in the system, no unit code is required.

  The format of the coded messages transmitted by the

  Positive control when operating in the security mode differs from the format of the command messages described above, since security mode facilities are not addressed selectively

  to a particular slave module. This is why trans-

  mission of a unit code is not required. The COMMAND DEVICE STATUS COMMANDS used when the system is operating in the security mode include:

  (1) INSTANT TRIP, (2) RELEASE DELAY,

  (3) INVALIDATION, (4) ALARM and (5) REGRESSIVE COUNT. The

  control device is placed either in the se-

  INSTANT TRIP, either in the mode of se-

  SECURITY TRIP DELAY, by operating the appropriate mode selection switch, which is located

  on the front panel of the control device 20. The

  positive control 20 is programmed so as to trans-

  put the appropriate message INSERT TRIGGER COMMAND

  TANTANE or DELAY CONTROL DELAY, when placed in any of its armed states, in

  the sole purpose of carrying out an update of the state of

  door which additional control device that can

  to be contained in the system. Where the present invention

  If the application is used in an application with only one controller, the transmission of an INSTANT TRIP or TRIP DELAY status command is not required. The ALARM CONTROL or the REGRESSIVE COUNTER CONTROL is transmitted by the controller in response to receiving an ALARM signal.

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  RELAY via power supply lines or an encoded audio signal from the detector

  input. The message ALARM COMMAND is transmitted when

  that the controller is in the INSTANT TRIP state and the REGRESSIVE COUNTER CONTROL message is transmitted when the controller is in the TRIP DELAY state. The slave modules are programmed to respond to receipt of the ALARM CONTROL from the control device,

  by an immediate execution of their respective tasks.

  Conversely, the slave modules are programmed in such a way

  re trigger a timer that triggers a delay of 40 seconds when receiving the COUNTER CONTROL

  REGRESSIVE on the part of the control device before

  to perform their respective tasks. The message ORDER OF IN-

  VALIDATION is transmitted by the control device 20

  whenever the latter is placed in the INVALID mode.

  DATION. The control device is switched from the DE mode to

  IMMEDIATE CLOSURE or TRIP DELAY mode in INVALIDATION mode by means of the introduction of a five-digit secret code preselected by the owner, on a keypad located on the front panel of the device

  control. Slave units are programmed from

  to respond to the receipt of an INVALIDATE ORDER

  TION issued by the control device, ceasing

  to perform their respective tasks, if they have been

  previously enabled, or by disabling their timers

  providing a delay of 40 seconds.

  Each of the status control messages of the device

  The control system described above uses the same coded format as that shown in FIG. 4C. As can be seen in this diagram, the message is subdivided into two

  segments. The first segment consists of the preamble, the co-

  eight-bit dwelling, the instruction code to be used

  be bits, the parity bit, the eight-bit secret code and

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  a double space. The second segment includes

  Include the preamble, the eight-bit dwelling code, the four-bit instruction code, the parity bit, the eight-bit secret code, and a double space. The secret code in the preferred embodiment comprises a number of five digits (each digit being

  by a decimal digit 1-5) to provide an approximate number

  propriety of possible combinations of codes. Therefore, the binary coded decimal representation of the secret code requires three bits for each digit, a total of

  fifteen bits of information. Therefore, in order to

  to maintain uniformity in the formats of the messages of the

  positive control, the transmission of messages is sub-

  divided into two segments, the second segment of the message

  producing the first segment, outside the part of the

  secret code of transmission. Specifically, the first

  first segment includes the first seven bits of the se-

  cret and the second segment contains the last eight bits of the secret code. A "0" is arbitrarily introduced

  in the first slot of the secret code part of the

wise.

INPUT DETECTOR (12)

  Referring to Figure 5, we see

  the diagram of a circuit of the transmitter module 14 of the

  input detector 12 according to the present invention.

  As will be recalled, the emitter module 14 is able to respond to the close movement of the permanent magnet

  externally disposed and produced in response to this displacement.

  a coded audible signal consisting of tones

  alternating between them in a sequential and

  frequencies of 6 kHz and 7.3 kHz, tones

  with a predetermined spacing between them

  mine. Referring further to Figure 6, there is shown

  present a chronogram illustrating the coded audible signal

  produced by the transmitter module 4 in the form of reali-

83552

  preferred embodiment of the present invention. In particular, the coded audible signal produced by the transmitter module 14 comprises an initial burst of 6 kHz tones, of a duration of about 15 milliseconds ("A"), followed by a pause of 62.5 milliseconds, and then a second burst

  tones lasting 15 milliseconds at a frequency

  this 7.3 kHz ("B"). This alternating tone signal is repeated five times ("ABABABABAB") with an interval of 62.5 milliseconds between successive tones. The period of the spacing between successive alternating frequency tones is chosen sufficiently long to eliminate the possible problems of echoes (as will be explained hereinafter in more detail), while being chosen

  simultaneously short enough to ensure that the

* the whole transmission is kept at a relatively small value, ie less than three

quarter of a second.

  Referring again to Figure 5, we see

  that the transmitter module 14 of the embodiment

  The circuit is formed mainly by a specially designed integrated circuit 40 which provides the alternating frequency tone signals of 6 kHz and 7.3 kHz, according to the timing sequence pattern illustrated in FIG. 6. The circuit is powered by a source 42 formed of a 9-volt portable battery, which is connected to the input V + of the integrated circuit 40. In the embodiment,

  the special integrated circuit made 40 comprises a circuit

  low battery voltage detection, which allows

  controls the voltage level of the battery 42 and produces a single low voltage output signal of

  the battery when the battery voltage level falls below

  below a predetermined level. The emitter circuit 14 is powered by the setting of the mode internal switch 44 in the ON position. With the mode switch 44 in the ON position, the integrated circuit 40

83552

  responds to a detected change in the state of contact 46 of the switch, which is responsive to neighboring movement

  the magnet 16 mounted externally (Figure 1). In part-

  In this case, the switch 46 of the detector is connected to the input terminal (+ TR) of the specially designed integrated circuit, which constitutes the input of a trigger circuit which is adapted to detect a variation of the state of one

  either of the inputs (+ TR) and (-TR) of the contact of the

  feeler. The external conditions represented on the

  of the circuit are provided in such a way as to allow the

  the transmitter 14 to be used as an option with any other external input detector, which provides a

  closing or opening a contact.

  The integrated circuitpecialized realized 40 further comprises a counting circuit and a sequence encoder,

  which responds to the tripping circuit so as to control

  the transmission of alternating frequencies of 6 kHz and 7.3 kHz. Signals with frequencies of 6 kHz

  and 7.3 kHz are in turn produced by a separate circuit.

  frequency finder located within the specially-made integrated circuit 40 and which divides the signal with the 32.768 kHz frequency sent to the OSC-IN and OSC-OUT terminals of the specially designed integrated circuit 40, from

  of a quartz clock crystal 48. The sequence coder

  these in turn feeds an output amplifier which is

  connected to the transducer 50 which, in the form of

  tion, consists of a piezoelectric device

  with a fundamental frequency of 6.5 kHz.

  It has been established that a single piezoelectric transducer

  a fundamental frequency approximately

  at a median value between the desired output frequencies

  6 kHz and 7.3 kHz can be used to

  the tones of the two frequencies at dB levels

acceptable.

  MODULE (18) FORMING SIGNAL TRANSMISSION RELAY

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  Referring now to Figure 7, there is

  shows the diagram of a circuit of module 18

  signal relay relay, in accordance with the

  this invention. It is recalled that the function of the module

  relay 18 is to receive the coded audible signal delivered by the input detector 12 and to transmit, in

  response to this signal, a digital signal coded according to a

  coded pulse, via the lines

  supplying power to the control device 20.

  The relay module 18 of the present embodiment

  The relay module 18 essentially consists of a power supply source circuit 60, a specially designed integrated circuit 70, and a four-bit microprocessor 80. The relay module 18 is adapted to be plugged into a conventional general socket and receives by Accordingly, a primary power supply provided by an AC signal at 120 volts, 60 Hz. However, in the case of primary power failure, a portable battery-shaped backup source 54 is also provided. The coded audible signal delivered by the input detector 12 is received by a transducer 56 which, in the preferred embodiment, is constituted by

  a microphone that is mounted at the base of a couple of ori-

  these tuned mechanics. Referring further to the

  8, it can be seen that the housing of the relay module 18 comprises a pair of tuned orifices 58 and 59, which consist of resonators operating on

  1/16-th of the wavelength and which act in the

  re simple mechanical band pass filters so as to

  essentially exclude or attenuate the noise and

  audible signals other than the desired 6 kHz and 7.3 kHz tones emitted by the input detector 12 before converting the tones into electrical signals for

the microphone 56.

  Referring again to Figure 7, we see

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  that the output signal of the microphone 56 is sent to a

  input of the specially designed integrated circuit 70, which

  responds to the input of a false alarm receiver

  my constant ("CFAR") for detecting the audio signal at 6 kHz / 7.3 kHz delivered by the input detector 12. Referring further to FIG. 9, there is shown a

  more detailed block diagram of the CFAR receiver circuit used

  in the preferred embodiment of the present invention. Initially the output signal delivered by

  the microphone 56 is delivered via the

  62 to a broadband bandpass filter 64.

  The output signal of the broadband bandpass filter is then sent to a limiter circuit 66, whose signal

  output is in turn sent to a couple of

  narrow-band se-band 68 and 72 having fundamental frequencies which are centered respectively at 6 kHz and at 7.3 kHz. In an environment rich in white noise and multipath signals, as is the case when audio signals are transmitted in a home or building, it is important to focus the decoding effort on the reflected signal. the

  more intense. This can be achieved by means of the combination

  The broadband band-pass filter, the limiter, and the narrow-band band-pass filter provide signal processing for extracting the strongest signal in the spectrum. More specifically, the limiter circuit 66 serves as a black box providing a constant energy, by providing energy

  the most intense signals received from the

  of the broadband band-pass filter 64. Thus the cir-

  Limit cooker 66 emphasizes the difference between the intense information signal and the comparatively lower background noise. It should be noted that, if only the

  narrow-band bandpass filters 68 and 72, one obtains

  should some form of automatic gain control

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  to compensate for different levels of noise

  background. However, the automatic gain control

  unacceptable delays in the process of deco-

  In addition to requiring high quality factor "Q" bandpass filters, these are difficult to realize in the form of integrated circuits. In this regard, it should be noted that, then, that a receiver having an automatic gain control "typically" forgets a valid signal and is ready immediately following a transient noise phenomenon, the present CFAR receiver identifies correct way such a signal since the gain

  in the CFAR receiver is not set consistently.

  The output signals from the narrowband bandpass filters 68 and 72 are sent to respective envelope detectors 74 and 76. The detectors

  envelope 74 and 76 ensure that the trans-

  band-pass filters 68 and 72 are of sufficient duration to constitute

  valid. In addition, the envelope detectors 74 and 76 serve

  to remove any shortcomings in the output signals.

  issued by narrow-band bandpass filters

  68 and 72, which may appear under the effect of

  "two signals having the same amplitude and

  opposite phase angles. Exit signals

  by the envelope detectors 74 and 76 are sent

  to a pair of respective comparators 78 and 82 which serve

  threshold detectors to establish a level of

  minimum, that the received signals must exceed in order to be admitted as valid signals. In the form

  preferred embodiment, the amplitude of the reference signal

  this sent to the threshold detectors 78 and 82 is also selected

  the half of the maximum output level delivered by the

  narrowband bandpass filters 68 and 72.

  At this point, the relationship between the operating characteristic of the CFAR receiver and the

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  delay of 62.5 milliseconds between

  successive stages in the intrusion audio signal. In by-

  In particular, the delay of the intrusion audio signal is chosen equal to a sufficient duration so that it is guaranteed that at the instant when, for example, the signal at 7.3 kHz is transmitted, the echoes from the previous transmission 6 kHz signal are sufficiently weak to be excluded or eliminated by the CFAR receiver. Thus only the signals valid at 6 kHz and 7.3 kHz are alternately transmitted by the receiver CFAR, which makes it possible

  the use of the "exclusion" circuit described hereinafter.

  In order to further improve the reliability of the

  audio communication link, the audio receiver is

  killed in the relay module 18 and further comprises

  a unique logic transfer circuit that succesfully

  the presence of the signal at 6 kHz and the absence of

  signal at 7.3 kHz, followed by the presence of

  7.3 kHz and the simultaneous action of the signal at 6 kHz.

  In particular, the output signals of the two circuits

  78 and 82 are connected to inverters

  84 and 86. The output signal of the inverter 84 is sent to the input of a first NOR gate 94 and, through another inverter 88, to the input of a second NOR gate 92. Similarly, the output signal of the inverter 86 is sent to the other input of a NOR-gate 92 and, via an inverter 90, to the second input. of the NOR gate 94. The output signals delivered by the NOR gates 92 and 94 are then

  sent to analogue switching devices

  96 and 98, before being combined and sent, via a final inverter 115, to the output terminal 14 of the integrated circuit 70 specially made. The ON / OFF states of the analog switches 96 and 98 are controlled by a switching signal sent by a

  microprocessor 80 has the input terminal 15 of the circuit

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  layer 70; The switching signal delivered by the micro-

  processor is sent, via a first

  inverter 100, at the control terminal of an analog switch

  logic 96 and, via a second inverter 102, to the control terminal of an analog switch 98. The logic transfer circuit operates from

  the manner indicated below. When a valid pulse signal at 6 kHz is received, the output signal of the com-

  paratridge 78 goes high (HI), which has the effect of sending a high level (HI) input signal to the gate

  NOR 92. However, the output signal of the NAND gate

  OR 92 does not go high unless at the same time the 7.3 kHz signal is absent, so that the signal

  Comparator output 82 goes low (LO). In addition

  very terms the exit of the NOR gate 92 passes to the

  only when the output signal from comparator 78 is high and the signal

  output from the comparator 82 is low.

  Similarly, when a signal formed of a pulse valid at the frequency of 7.3 kHz is received later, the output signal from the comparator 82 goes high, which has the effect of bringing about top

  a signal sent to the entrance to the NOR gate 94. However,

  the output signal delivered by the NOR gate does not go high when receiving the high level signal from the comparator 82, before

  the output signal delivered by the comparator 78 is also

  at a low level. Consequently, the output signal delivered by the NOR gate 94 goes high when

  reception of a 7.3 kHz signal only if a signal

  6 kHz signal is simultaneously absent.

  Analog switching devices 96

  and 98 connected to the outputs of the respective NO gates

  OR 92 and 94, are made conductive and non-conductive

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  alternately by means of the switching signal sent by the microprocessor 80 to the input terminal 15 of the integrated circuit 70 specially formed. The microprocessor 80 is

  programmed to detect the presence of valid signals

  at 6 kHz and at 7.3 kHz in pre-defined "windows". Returning momentarily to the timing diagram of the coded audio signal shown in FIG. 6, the microprocessor

  is programmed to detect impulse signals.

  at 6 kHz and 7 kHz in windows

  20 milliseconds, which are centered

  round expected locations of tone signals

  pulses of 15 milliseconds. To achieve this goal

  jective, the microprocessor 80 synchronizes with the transmitter -

  audio output from the input detector 12, as follows:

  the receipt of the first burst of valid signals

  6 kHz, while waiting for a time interval of 2.5 milliseconds which is less than the total 77.5 millisecond

  bursts of successive alternating tones, then detecting

  a signal consisting of a burst of tones at 16.3 kHz

  valid in the next 20 milliseconds.

  Although the tone signals produced by the detection

  12 have a duration of 15 milliseconds, the microprocessor 80 is programmed to accept as a valid signal a burst of tones with a duration of at least 7.5 milliseconds, since

  Signals may appear for the duration of the

  15 milliseconds. Further, the microprocessor 80 is programmed, in the preferred embodiment, to accept, as a valid coded audio signal, the received signal formed of any of three signals.

  Alternate alternating valid tone. In other words

  my a valid signal from the input detector is assumed

  have been detected following the receipt of a sequential

  this correct tones of 7.3 kHz-6 kHz-7.3 kHz. So,

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  in view of the fact that the coded audio signal sent by the input detector 12 repeats the sequence of 6 kHz-7.3 kHz tones five times, the current system allows a large margin of errors to ensure that the signal encoded audio is reliably detected by the

the relay train 18.

  Once the microprocessor 80 in the relay module 18 determines that a valid coded audio signal from an input detector 12 has been received, the carrier signal of the RELAY ALARM power supply line is transmitted. through

  power supply lines to the dis-

  20. The PLC transmitter circuit of the preferred embodiment is incorporated into the specially designed integrated circuit 70. A block diagram of the PLC transmitter located in the relay module 18 is shown in FIG.

  PLC has a carrier frequency signal of 121 kHz

  encoded pulse modulation, which is synchronized to the cancellation points of the 60 Hz AC waveform, when AC power is present. The 121 kHz carrier frequency signal is delivered by a 484 kHz vibrating ceramic resonator and is connected to inputs OSC1 and OSC2 of the specially integrated integrated circuit 70. The inputs OSC1 and OSC2 feed an internal oscillator circuit 110 which delivers a 484 kHz oscillator output signal. This 484 kHz oscillator signal is fed to a frequency divider circuit 112, which delivers a 242 kHz output signal in line 114 and a 121 kHz output signal.

  in line 116. The 242 kHz signal present in the

  gne 114 and the 121 kHz signal present in line 116 and delivered by the divider circuit 112 are both

  sent to a logical transfer circuit identified by 118.

  The logic transfer circuit 118 serves to reduce the rate

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  of 50 per cent of the 121 kHz signal present in line 116 at a rate of 25 per cent utilization in line 120. The signal obtained in line 120 is

  then sent via an amplifying circuit

  driver 122 at the terminal (output terminal pLC7) of the integrated circuit p * Lalerent achieved. Signal transmission

  at 121 kHz via the transfer circuit lo-

  However, the logic 118 is controlled by the microprocessor which sends the validation signal to the PLC ENABLE input (terminal 16) of the integrated circuit 70.

  the microprocessor 80 controls the timing of the transmission.

mission bursts of PLC signals.

  Returning to Figure 7, we see that the micro-

  processor 80 receives a cancellation signal at 60 Hz cir-

  culminating in line 124 from the food circuit

  60 to provide the timing of the PLC signal transmissions in accordance with the encoded pulse format described above. The HOME CODE selected for the system is sent to the microprocessor 80 via the setting of switches 126. The

  PLC OUT signal obtained from the integrated circuit (terminal

  No. 7) is injected into the power supply line

  through a device forming a landing stage

  than output 126 and through a transformation

  128, which is connected across output 52 to 120

volts - 60 Hz.

  In view of the fact that only one 'channel' of

  communication for the power supply lines is used in the present system to send messages to and from different devices,

  poses a potential problem where more than one device

  to send a message simultaneously. The risk that such

  problem is particularly acute in a system

  security system, in which the simultaneous detection of

  same event by more than one device is a possibility

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  real. In order to avoid the problem of a "collision" and

  the scrambling, screaming, messages, the micropro-

  in the relay module 18 (thus

  that the microprocessor in the control device

  of 20) are programmed to interrogate the line

  energy supply before the start of a transmission

  to determine if the information o a quantity of excessive noise is present in the line. If either of these conditions is detected, the microprocessor

  80 delays transmission of its PLC message.

  This "anti-collision" characteristic of the pre-

  This invention is carried out as follows.

  Due to the type of PLC encoding formats used in this system, it is necessary that one finds oneself

  in the case of the absence of a signal to the carrier frequency

  of 121 kHz in the energy supply line

  at least three complete cycles of the supply line

  alternating current before we can assume

  that there is a loss of information in the line.

  Therefore, the microprocessor 80 is programmed manually.

  to interrogate the line during the three com-

  Plets of "dead time" in the AC line

  before the transmission of a PLC message starts.

  In addition, the microprocessor 80 is also programmed to interrogate the AC line & the

  time regarding the possible presence of information

  and / or excessive noise during transmission of a PLC message. In particular we will remember, by

  referring to the description in Figure 2, that the frequency

  carrier at 121 kHz appears only during an alterna-

  this of any given cycle of the waveform has

  alternating current at 60 Hz to produce an encoded "1" or "0". Therefore the microprocessor 80

  is programmed to interrogate the power line

  with regard to the possible presence of

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  excessive information and / or noise during this

  alternation 'unused' of the current waveform

  alternative, when transmitting a PLC message.

  In the preferred embodiment of the system, interrogating the power supply line to determine if there is information or noise levels

  inadmissible, is carried out in the manner indicated below.

  The on-demand integrated circuit 70, which is present in the relay module 18, also has a PLC receiver circuit provided for this purpose, even though the relay module is only suitable for the transmission of PLC signals. The signal outside the power supply line, delivered by the coupling transformer 128, is sent to the input PLC IN (terminal 20) of the integrated circuit

  70 through a pass filter circuit

  130, which has a corresponding central frequency

  at the 121 kHz PLC carrier frequency. With reference

  in addition to Figure 11, a diagram is shown

  block of the PLC receiver circuit present in the integrated circuit.

  70. The filtered AC input signal is sent to a threshold comparator circuit 132 which compares

  the signal arriving at a threshold established externally and

  at terminal 1 of the integrated circuit 70. The signal of

* issued by the comparator 132 is straightened by a

  trainer 134 and is sent to a maximum detector, and to a signal averaging circuit 136, which outputs a continuous level signal on its output. The continuous output signal delivered by circuit 136 is

  sent by a second comparator circuit 138

  threshold established internally before being trans-

  to the PLC OUT terminal (78) of the integrated circuit 70

especially.

  The microprocessor 80 is programmed so

  to detect the presence of information or noise ex-

  stop in the AC power supply line, by means of the examination of the signal delivered by the output of the PLC receiver circuit on the terminal 18 of the circuit

  70. In particular the microprocessor 80 of the

  The preferred embodiment is programmed so as to

  to ground the signal of the SORTIEPLC line at a sampling frequency of about 150 microseconds. If a continuous signal lasting more than 400 microseconds

  is detected, it is assumed that one is in the presence of a

  training, and the microprocessor 80 "suspends its action" (that is, it waits). Further, the microprocessor is programmed to count the number of peaks or noise pulses detected during the predetermined time interval in the output signal delivered by

  the PLC receiver circuit on terminal 18 of the integrated circuit

  70 and so as to wait, if the total counted number exceeds a predetermined number, as in

  the case of a "collision" of information. In one or the other

  cases where the presence of information or

  excessive noise has been detected, the microprocessor is

  grammed to apply a delay time of random duration before attempting a new broadcast. Given the duration of the COMMAND DEVICE AND CONTROL DEVICE STATUS messages (FIGS. 4A and 4C) - the longest PLC message formats used in FIG.

  the system - the random delay in the form of

  The preferred setting is 400 milliseconds.

  and 2 seconds. (It should be noted that the MESSAGE OF THE STATE OF DIS-

  POSITIVE CONTROL shown in Figure 4C is trans-

  put in two parts so that the period of random delay

  required waiting time is not excessively long). All relay modules 18 and all control devices 20 present in the system are programmed to function in the same way in this respect. Therefore, when each device located

  in a possible collision situation applies a

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  late random, the conflict of priorities regarding access to the power supply line & alternating current

  is resolved in an arbitrary manner. Therefore the

  that two devices create a perpetual standby state is avoided. Finally, the relay module 18 of the preferred embodiment comprises an LED 139 (FIG.

  7), which is connected to the output terminal 01 of the micropro-

  80. The microprocessor 80 is programmed so

  to supply the LED 139 for 30 milliseconds

  that a valid coded intrusion audio signal was received and flashing LED 139 at a fast rate

  whenever the voltage level of the battery 54 falls

  be below a predetermined minimum (assuming

  that the alternative power supply

native is present).

CONTROL DEVICE (20)

  Referring now to Figure 12, there is

  the partial diagram of a circuit of the

  in accordance with the present invention. The controller 20 includes the primary interface

  present between the system 10 and the user. The provision

  control 20 of the preferred embodiment

  door LCD liquid crystal display

  to display the system status information and to display

  expensive five keys on the keyboard. The keyboard has

  in addition, specialized keys for ALLU-

  MAGE OF ALL LAMPS, EXTINCTION OF ALL

  LAMPS and SECRET CODE. As stated in the

  description of the system given above, the device for

  command 20 is adapted to receive coded messages

  PLC from the relay modules 18, or

  encoded intrusion audio signals delivered directly by an input detector 12, and for delivering, in response to this detection, PLC coded messages to the different modules

83552

  slaves 22 present in the system. In addition,

  The control signal 20 is adapted to receive the PLC messages from other control devices present in the system and indicating which is the main state of the other control devices of the system, the introduction

  a new secret code or other information (eg

  a parity check), which can be communicated to the control devices. In the preferred embodiment, the main state of a controller is communicated through the power lines.

  in energy every 15 minutes and with each change

  the main condition to ensure that all

  The system control system is always in the same state. The main states in the present system, which

  communicated through the food supply lines.

  energy, include non-transient states

  associated with the safety mode of operation of the

  tif command and include TRIGGER commands

  INSTANTANE, DELAY OF TRIGGERING and INVALIDATION.

  The different states of the control device

  of the system in the preferred embodiment are summarized.

below.

  a) INVALIDATION STATUS. The INVALIDATION state is one of the three main security states of the controller and is the state to which most

associated states of non-security.

  (b) TEST STATUS. The TEST state is used to perform a complete test of the installed security system. when

  is in this state, the control device

  to the different slave modules an ALARM message coded according to a PLC message and followed by two seconds more

  late, by an INVALIDATION message. In addition, the use

  may test the whole of the experiment.

  input 12 of the system by manually operating

  the input detectors, and the communication device

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  message transmits a message IGNITION OF ALL LAMPS,

  followed, two seconds later, by the message EXTINC-

  TION OF ALL LAMPS. In addition the device

  command activates its internal alarm during this inter-

valle of two seconds.

  c) IGNITION OF ALL LAMPS. It is a transitional state

  re, which results in sending the PLC command message

IGNITION OF ALL LAMPS.

  d) EXTINCTION OF ALL LAMPS. It is a transitional state

  which causes the sending of the PLC command message

EXTINCTION OF ALL LAMPS.

  e) EMERGENCY ALARM. It is a transitional state that

  sending the PLC ALARM command message and is de-

  latched, regardless of the current state of the system,

  by pushing all the buttons ALLUMA-

  GE OF ALL LAMPS AND EXTINCTION OF ALL LAMPS

  PES, for a duration greater than half a second.

  Once it is triggered, the EMERGENCY ALARM state behaves exactly like an alarm in the case of an intrusion and can be suppressed either by the introduction of the secret code or by waiting of the alarm timer running during

a duration of 15 minutes.

  f) ERROR. It is a transitional state that informs the

  number entered incorrectly when entering an invalidation code or when entering a new secret code. This state causes the delivery of a low volume beep with a duration of

  milliseconds, at the internal alarm of the dis-

  Positive control and clears the display. for half a second. g) POWER SUPPLY CONNECTED. This is the state that is obtained when the power supply is applied

  initially to the control device either by

  cording a battery, either by connecting the battery

83552

  Positive control in an AC outlet.

  This state stores 11111 as a secret code and

  lags and stops blinking

  until the PIN button is pressed.

  dark and that a new secret code is introduced.

  h) INTRODUCTION OF THE SECRET CODE. This state is always triggered

  when you press the PIN button and the system is in the INVALIDATION, TEST, or BRANCH POWER SUPPLY states. The button must be held down during the whole operation of entering the five digits of the secret code. then

  release of the button, the secret code is automatically

memorized.

  i) INSTANT TRIP. This state is one of the three main states of the system. In this state, reception of a coded audio signal from an input sensor or an alarm signal from the PLC relay causes an immediate transition to the ALARM INITIAL state. INSTANT TRIP state can not

  to be inserted only by pressing the DECLEN-

  INSTANTANE CHEMISTRY for at least 0.75 seconds or

  as a result of receiving a status message TRIGGER-

  INSTANTANE MENT via the power lines

  energy, from another control device. In addition, this button is only indicated by an INSTANT TRIP display on the display device when the control device is in the INVALIDATION state. Therefore this state can

  be introduced only from the state INVALIDA-

  TION and may be removed only by means of

troduction of the correct secret code.

  j) ACTUATION OF THE ALARM. This state is the primary state

  to trigger an extended alarm to the system.

  tem. Assuming the system is in a state

  armed, this state may be introduced as a result of

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  ception of an encoded audio signal delivered by an input detector, or a PLC alarm message issued by a

  relay module. In addition, this state may also be

  This is done by simultaneously operating all the IGNITION switches on ALL LAMPS and EXTINGUISHING ALL LAMPS. This state is active during the entire 15-minute alarm period and can not be stopped before the 15-minute lapse, by means of a correct introduction of the

secret code.

  k) COMPLETING THE ALARM. This state is an extension of

  the previous state ACTUATING THE ALARM and representing

  the actions taken when the clock is triggering

the 15-minute alarm stops.

  1) INVALIDATION CODE INTRODUCED. This state is introduced

  when the key label display with num-

  ros and a numbered button is pressed. The

  five-digit secret code is introduced and is

  trimmed with the memorized code. Or, if the PIN button is also pressed and the device

  command is in either of the INVALID-

  DATION, TEST or APPLIED ENERGY FEED, the entered five-digit number is stored as

than new secret code.

  m) DELAY OF TRIP. This state represents one of the three main states of the controller. The state

  DELAY OF TRIGGERING can only be introduced

  firing of the VALIDATE OF TRIP. This state is triggered upon receipt of a PLC relay alarm message or an encoded audio alarm signal from an input detector, or by means of

  the introduction of the correct secret code.

  n) PROGRESSIVE COUNTER DELAY. This state represents the

  counting a 40-second count, which

  kills a progressive count from the receipt of a

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  intrusion message to the ALARM TRIP state. This countdown state is also responsible for controlling the counting display

  regressive over 40 seconds in the display device.

  ge and message transmission REGRESSIVE COUNT

PLC, sent to the slave modules.

  o) TRIP VALIDATION. This state is introduced at

  means of receiving a status message DELAY FROM

  CLOSURE in the power supply line, from another control device or under the effect of pushing the DELAY button OFF,

  for at least 0.75 seconds, and represents the tran-

  between the main states of the communication device

  INVALIDATIONtRE1Dde of [/ ER'CHEMENT. The device

  command completes the transition & the DELAY DEATH-

  MENT once the state VALIDATION OF TRIGGERING

  is introduced at the end of the 40 second flow.

  after the detection of the output outside the local pro-

  after a lapse of two minutes has elapsed without exit, from the moment o

  the TRIP DELAY button has been pressed. The co-

  secret can be introduced during this interval

  time to inhibit this condition and

  Positive control in the INVALIDATION state.

  P) LOW BATTERY VOLTAGE RELAY. It is a transitional state

  which is introduced when a message PLC FILE IS

  BLE is received from a relay module

  killed in the system and indicating that in this module

  relay, the state of the battery voltage is low.

  corn. The only action taken in this state is the

  "weak battery relay" flag in the display of the control device and the

  triggering the stop counter for the low battery.

  In order to position this low voltage flag of the battery in the display device of the device

83552

  command, a LOW BATTERY PLC message must be

  received continuously between the corresponding intervals

  to the 3-minute soul and the 16-minute minute, otherwise the

flag is erased.

  q) CONTROL DEVICE WHOSE BATTERY VOLTAGE IS LOW. This is a transient state that occurs when a test of the controller battery indicates that it is

  exists a state in which the battery of the communication device

  Mande provides a low voltage. The only action

  taken in this state is the branching of the flag of

  control device with low battery power

  In the display of the controller, reference is again made to the diagram of the circuit of FIG.

  generally comprises an energy supply.

  146, the same integrated circuit 142 made to measure and used in the relay module 18, and a micro-

  eight-bit processor. In addition the control device

  has a display panel (not shown) which

  holds a conventional LCD liquid crystal display driver and the various switch contacts for the buttons that appear on the keyboard panel of the controller. The microprocessor 140 command

  the driver stage of the LCD display device on the

  display, via terminals B0-B2 and is connected to the different switching contacts on

  the display panel via terminal blocks

  D0-D7. The D0-D7 input terminals of the microprocessor 140 are also connected to two rotary switches

  located on the lower panel of the

  to adjust the system slot code.

  The function and function of the circuit

  specifically realized, which includes the circuit of

  terface located between the specially-realized integrated circuit

83552

  and the AC line at 120 volts-60 Hz, are

  identical to those provided in the relay module 18.

  Consequently, the control device 20 receives an in-

  training outside the AC power supply line and transmits the information in this AC power supply line of

  the same way as the relay module 18. Natural-

  while the controller 20 decodes and

  interprets the received PLC messages, the module

  lais 18 simply identifies the presence of PLC messages in the line, for anti-collision purposes. In addition,

  as mentioned before, the microproces-

  140 located in the control device is programmed

  to control the AC line both before and during message transmission

  PLC in relation to the possible presence of

  or excessive noise levels and "hold" for a random delay time if either of these conditions is detected. As means

  to avoid possible collisions.

  in the system using

  multiplex, the microprocessor 140 located in the dis-

  positive control 20 is further programmed so

  to automatically apply a random

  taken between 0 and 400 milliseconds after reception.

  a RELAY ALARM message, before sending the message

  appropriate wise of the PLC control device to the slave modules.

  As in the relay module, the

  The control unit is also equipped with a power supply

  battery-shaped emergency power supply 148, so that the control device can continue to

  operate in the event of a failure of the

  primary AC current. In addition,

  control 20 includes an internal audio indicator,

83552

  a piezoelectric transducer 152 driven by a cir-

  3 kHz oscillator 154, which in turn is enabled by a control signal supplied by the output terminal B6 of the microprocessor 140 and sent to the oscillator circuit 154 via switching transistors 156. The microprocessor 140 is programmed to in order to activate its internal alarm 152, upon receipt of a PLC signal RELAY ALARM, or when receiving an intrusion audio signal, when the control device is in the INSTANT TRIP mode, and after the application of a delay of 40 seconds, when it is in the

  DELAY DELAY mode. In order to guarantee the delivery

  appropriate sound pressure levels (eg

  at least 85 dB) by the transducer 152, on-uses

  in addition, in the preferred embodiment, a

  that resonant mechanics located at an appropriate distance

  of the piezoelectric transducer 152, so that the

  acoustics delivered by this transducer are

  chies outside the resonant plate without cancellation

* phase resulting in a reduction of the sound.

SLAVE MODULE (22-26)

  Referring to Figure 13, it shows

  The diagram of a lamp module circuit 22 according to the present invention is shown. As indicated,

  the slave modules 22, 24 and 26 are adapted to receive

  see PLC control signals from the device

  20 and to control the activation of their

  respectively in accordance with these control signals.

  Note however that the device module and the module

  24 and 26 are essentially equivalent to

  dule of the lamp 22, from the point of view of their functions and their configurations, the differences with respect to this module being related to the characteristic of the load

  particular which is ordered. In addition, the alarm module

  cQoMQRte a source of energy-supply of se-

83552

  course to stack so that the audio alarm sounds in the

  case of an intrusion despite a failure of the

  AC primary energy supply. On au

  on the other hand, the lamp module and the device module are not equipped with battery assistance.

  The lamp module 22 of the embodiment form

  preferred setting generally includes a food

  energy supply 158, a four-bit microprocessor

  , a PLC input circuit 162 for the connection between

  face of the microprocessor 160 to the alternating current line

  tif, and an output circuit 164 for the control of the

  The oscillator circuit 166 having a crystal oscillator 168 is connected to the inputs OSC1 and OSC2 of the microprocessor 160 so as to output the internal clock rate for the microprocessor. A

  first set of switches is connected to the

  R0-R7 data of the microprocessor and is set to the house code provided for the system. A second set of switches is also connected to the data inputs R0-R7 of the microprocessor etpéoet to establish

the unit code of the slave module.

  The PLC input circuit comprises a transforma-

  coupling unit which is connected to the terminals of the AC line. The output signal delivered by the

  coupling transformer 174 is sent to a filter not-

  it is in turn 121 kHz and an amplifier circuit 176, which in turn in turn sends the signal PLC IN to the input terminal K2 of the microprocessor 160. The output circuit 164 includes a triac 178 which is connected in series with the load across the AC power supply lines so as to control the charging of the load. The conductive state of the triac 178 is

  controlled by the microprocessor 160 whose output terminals

  parts 03 and 04 are connected to the gate of the triac. The half

83552

  croprocessor is programmed to decode and inter-

  preprocess the PLC messages received and produce a

  at the output terminals 03 and 04 when

  just validate the triac 178 to activate the charge.

  In particular the microprocessor 160 activates the triac 178 so that it places the load under voltage in response to the

  receipt of a COMMAND DEVICE CONTROL MESSAGE

  MANDE (FIG. 4A), provided that the dwelling code and the transmitted unit code correspond to the preset home coding and codec of the slave module 22 of the lamp. Similarly, the microprocessor 160 enables / disables the triac 178 in response to a control message from the control device IGNITION OF ALL LAMPS / EXTINCTION OF ALL LAMPS (FIG. 4B), provided that

  the message contains the correct dwelling code. In re-

  response to receipt of an ALARM CONTROL MESSAGE FROM

  CONTROL DEVICE (Figure 4C) with housing code

  correct, the microprocessor 160 immediately validates the triac 178 to place the load under voltage. Answering the receipt of a REGRESSIVE COUNTER CONTROL MESSAGE OF THE CONTROL DEVICE (FIG. 4C) with the

  correct dwelling code, the microprocessor 160

  delay 40 seconds before validating the triac 178.

  Finally, when receiving an INQUIRY ORDER MESSAGE

  VALIDATION OF THE CONTROL DEVICE (FIG. 4C) with the correct dwelling code, the microprocessor 160 removes the delay of 40 seconds if it is running and

  invalidates the triac 178 to disable the load.

  Further, it will be noted that the microprocessor 160 of the preferred embodiment of the slave module 22 of the lamp includes a STATUS DETECTION line 80, which is connected to the lamp so as to detect the ON / OFF state of the potential switch. be manually operated,

  which is associated with the lamp. In particular, in order to

  serve a local manual control of the lamp, the micro-

83552

  processor 160 is programmed to respond to the

  pulse produced in the DETECTION line 180 when the switch of the lamp is closed, and to validate the triac

  178 so that the lamp is connected. In addition,

  STATUS DETECTION pin 180 is also used to enable the remote control of the lamp without requiring the lamp to be permanently on. Specifically, it will be noted that the microprocessor 160 can not

  possibly not connect the lamp unless the switch

  the latter is closed. However, it is obvious

  undesirable to require that the lamp be permanently

  BRANCHEEto provide the possibilities for a remote control

  of. That is why the microprocessor 160 is programmed to detect the ON-OFF-ON sequential manual switching of the lamp switch in a short preselected time interval and to disconnect

  the lamp after two seconds. In this way the lam-

  pe is set to the DEBRANCHE state despite the fact that its switch is in the closed position, which allows a remote control via the slave module 22

  of the lamp. In order to manually connect the lamp

  eg, toggle to the ON / OFF position

  STOP the lamp switch. A LED 182

  corded to the output terminal Oo of the microprocessor 160 is

  powered by the microprocessor when the lamp is

  pe was placed in the remote control state.

  Similarly, it should be noted that the modules forming

  relay 18, the control device (s) 20 and the

  alarm slaves 26 of the present system are each provided with a battery back-up

  send an auxiliary power supply to the

  in the event of a failure of the AC primary power supply. In such a case, switching to the power supply provided by

  the battery automatically occurs and the micropro-

83552

  present in the different units are programmed

  in order to produce pre-programmed timing signals

  cis: from the internal crystal oscillator circuits and ceramic resonators contained in each unit so as to allow the units to communicate asynchronously via the power supply lines, in the event of a failure primary AC power supply. In this way

  the present security system can not be made

  failing as a result of the interruption of

  AC power sent to the protected room.

  It will be appreciated from the foregoing that, in accordance with an aspect of the present invention, an improved security control system which utilizes wireless audio communication and communication by

  energy supply lines, which facilitates the

system.

  In addition, it should be noted that, in accordance with another

  aspect of the present invention, a system can be provided

  the security command, which also provides the

  ability to remotely control the actuation of

  loads, including lamps and equipment.

  In addition, it should be noted that, in accordance with another

  aspect of the present invention, a system can be

  advanced security command that can not be easily broken by an intruder and that one

  can easily be invalidated following an introduction to

torisée.

  Following the previous description of the form

  preferred embodiment of the present invention, there is

  that it is possible to make many changes and modifications to the present invention without

out of the frame of the latter.

83552

Claims (36)

  1. Security system for installation des-   designed to detect an intrusion into a room and to signal the detection of such an intrusion, characterized in that it comprises:   - one or more input detectors (12) of   to be associated, during operation, to a corresponding number of input passages selected in   the premises to be protected in order to detect an intro-   in said respective inlet passages and to   an encoded audio signal in response to this detection, - at least one relay device (18)   signal transmission, intended to be electrically   an AC power supply line located in the protected space and to be within the audio range of one of said input detectors, said signal transmission relay device (18) comprising means forming an audio signal receiver for receiving said encoded audio signal and for separating said encoded audio signal from an external noise present in the received signal; communication transmitting means in the power supply line for applying a signal encoded relay in said power supply line   AC energy, and means forming   receiver for decoding said coded audio signal and   putting said transmission means present in said disc   positive relay circuit to transmit said coded signal of the re-   in response to the detection of a coded audio signal   lable, - a control device (20) intended to be   electrically connected to the power supply line   alternative source of the protected space, said   an apparatus (20) comprising   communications in the power supply line for receiving said encoded signal from the relay and separating said signal 83552   encoded external signals present in said AC power line, communications transmitting means in the power supply line   used to apply a coded signal of the communication device   said alternating current power supply line, and processor means serving   decoding said coded relay signal and allowing   said transmission means located in said communication device   transmit said coded signal from the control device   in response to detecting a valid coded relay signal, and - at least one slave device (22; 24; 26) for being electrically connected between said AC power line and a device   alarm system so as to control the activation of said   alarm device, said slave device (24; 26; 27) comprising transmission receiver means   the power supply line and serving to receive   see said coded signal from the control device and se-   parse this coded signal, of external signals present in   said alternating current supply line, modules   output yen for activating said alarm device   me, and processor means for decoding   said coded signal of the control device and to allow   to said output means for activating said device   in response to the detection of a valid coded signal. the control device.   2. Security system according to claim 1, characterized in that said control device (20) can operate, optionally, in a first mode, in which a first coded signal of the control device is applied to said line of power supply to   alternating current in response to the reception and de-   detection of a valid coded relay signal, either in a   second mode, in which a second coded signal of the 83552   control system is applied to that supply line.   AC energy in response to the   ception and the detection of a valid coded signal from:   foreshore. Security system according to claim 2, characterized in that said processor means located in said slave device (22; 24; 26) are   adapted to immediately validate said means for   to activate said alarm device in response to   response to the reception and detection of the first   code of the control device, and are also suitable for   to enable said output means to ac-   tive said alarm device after a delay   determined actor following the receipt and   detecting said second coded signal of the communication device   mande. 4. Security system according to any one   Claims 1 to 3, characterized in that said   processor means located in said device   are suitable for determining whether other   encoded signals are transmitted through the AC power supply line before   validating said transmission means present in said disc   positive control for emitting said coded signal of this device.   5. Security system according to the claim   4, characterized in that said process means   located in the control device are   be adapted to wait for a period of time   randomness as a result of a determination that   encoded signals are present in said feed line   in AC power before   to kill again an attempt to transmit the said signal coded control device.   6. Security system according to the claim 83552   4, characterized in that said processor means   located in said control device are further adapted   to determine if noise levels exceed   predetermined value are present in said feed line   AC power supply before enabling said transmitting means present in said controller to output said coded signal from that device. 7. Security system according to the claim   6, characterized in that said process means   located in the control device are otherwise   be adapted to wait for a random interval of time before attempting to transmit a signal again   code of the control device following a determination of   presence of other coded signals or levels   noise exceeding said predetermined value, in the   said AC power supply line.   8. Security System According to Any Vune   Claims 1 to 7, characterized in that said   encoded signal of the relay and said coded signal of the   control include signals with a carrier frequency of   determined, which are modulated numerically according to a   pulse-coded modulation in relation to the cancellation points of the waveform present in the AC power supply line such that a complete cycle of the waveform present in the line AC power supply is used to transmit each bit of information in said coded signals.   9. Security system according to claim 8, characterized in that said pulse code modulated carrier signal is representative of a digital "1" when a carrier frequency pulse is   produced during an alternation of the present waveform   in the alternating current power supply line 83552   native, and a logical "0" when an impulse & frequency   this carrier is produced during the other half of the   waveform present in the power supply line. AC power.   10. Security system according to claim 9, characterized in that said processor means present in said control device are furthermore   adapted to determine whether other frequency signals   pulse-modulated carrier are being transmitted through said AC power supply line during the transmission of a coded signal from the control device, by searching for the presence of said carrier frequency   in said power supply line at current   ternative during the unused alternation of the form of on-   present in the line of supply of energy to alternative.   11. Security system according to any one   Claims 1 to 10, characterized in that   encoded audio signal is associated with at least one predetermined frequency and said receiver means for audio signals, which are present in the device (18)   signal relay relay, contains a signal   constant false alarm rate receiver including a   broadband band-pass filter circuit, a cir-   a limiter circuit connected to the output of said broadband passband filter circuit, and a narrowband bandpass filter circuit connected to the output of said limiter circuit and having a center frequency   is approximately equal to said predetermined frequency.   12. Security system according to any one of   claims I to 11, characterized in that said   encoded audio signal has alternate tones   at first and second predetermined frequencies,   successive alternating tones lying. to one 83552   reciprocal location predefined.   13. Security system according to the claims   11 and 12 taken as a whole, characterized in that   said constant false alarm rate receiver con-   holds first and second pass filter circuits   narrow band, which are connected to the output of the   said limiting circuit and have central frequencies   approximately equal to the respective frequencies of   your tones with the first and second frequencies predetermined.   14. Security system according to one of the   12 or 13, characterized in that said means   audio signal receivers comprising decoding means for decoding said encoded audio signal and said decoding means comprising logic circuit means for detecting, in a corresponding alternating sequence, the presence of said tone   having the first predetermined frequency and the absence   this simultaneous of said tone having the second frequency   predetermined number, followed by the presence of the said   having the second predetermined frequency and the ab-   simultaneous presence of the said tone having the first predetermined frequency.   15. Security system according to any one of   Claims 12 to 14, characterized in that said   tones having the first and second frequencies   determined have equal respective frequencies at about 6 kHz and 7.3 kHz.   16. Security system for an installation   intended to detect an intrusion into a premises and to   Ie detection of this intrusion, characterized in that it comprises: means (12) for detecting an intrusion, for detecting an intrusion into the room to be   protected and delivering a signal in response to this 83552   control means (20) for receiving said coded signal from said   means (12) for detecting an intrusion and serving to pro-   alarm signals in response thereto, said controller means (20) being   function, either in a first mode, in the-   which a first alarm signal is issued in response to receiving a coded signal produced by said means   (12) to detect an intrusion, or in a second   of, in which a second alarm signal is generated in   response to receipt of a coded signal issued by the   said means (12) for detecting an intrusion, and - slave means (22; 24; 26) to be arranged remote from said control means (20) and to be connected to an alarm device to realize controlling the actuation of this alarm device, said slave means (22; 24; 26) being responsive to receiving said first alarm signal from said control means (20) so as to immediately activate said   alarm device, and being sensitive to the reception of-   said second alarm signal delivered by said means   controlling device (20) for applying a predetermined delay before activation of said alarm device. 17. Security system according to the claim   16, characterized in that said means forming   of control (20) are further adapted to   to produce a third signal, and that said slave means   ves (22; 24; 26) are sensitive to the receipt of said third   signal from those means   control system (20) so as to invalidate the applica-   said predetermined delay and prevent activation said alarm device. 83552   18. Security system according to the claim   17, characterized in that said means forming   control system (20) comprise input means   causing the operator to input information into said means (20) and that said means   Furthermore, the control devices are adapted to produce said third   signal only in response to the introduction of a secret code established by the operator, in said control means means (20) via said input means.   19. Security system according to the claim   18, characterized in that said means forming   tif (20) can operate in any one of said first and second modes in response to a   predetermined introductions made through of said input means.   20. Security system according to any one of   Claims 16 to 19, characterized in that said   control device means (20) are adapted   to be electrically connected to a power line   AC power supply of the protected room   and further include means for transmitting   cations in the power supply line, serving   introducing said alarm signal into said feed line   AC power supply.   21. Security system according to claim, characterized in that said slave means (22; 24; 26) are electrically connected between said AC power supply line and said   alarm device and furthermore include   receiver of communications in the power line   energy supply, for receiving said signals   alarm transmitted through said line of   AC energy supply from said   control device means (20). 83552   22. Security system for an installation   intended to detect an intrusion into a room and a   general detection of this intrusion, characterized in that it comprises: means (12) for intrusion detection, for detecting an intrusion in the premises to be protected and for producing an audio signal coded in response to this intrusion, said encoded audio signal having at least one predetermined frequency associated with this intrusion, and - a device (18; 20) for receiving and decoding said encoded audio signal and for generating an alarm signal in response thereto said device (18; 20) comprising constant false-alarm rate receiver means for separating said coded audio signal from the external noise present in the received signal, the receiver-receiver means including a broadband band-pass filter circuit (64); ), a limiter circuit   (66) connected to the output of said pass filter circuit   broadband (64) and a filter circuit   narrow-band se-band (68; 72) connected to the output   said limiting circuit (66) and having a central frequency   approximately equal to said predetermined frequency   undermined. 23. Security system according to claim 22, characterized in that said coded audio signal comprises   alternating tones with first and second   predetermined frequencies, alternating tones   successive series being located at a reciprocal spacing determined.   24. Security system according to claim 23, characterized in that said predetermined spacing has a sufficient duration to ensure that the echoes   obtained from the emission of the said tone possessed   first and second frequencies have sufficiently   decreased at the instant o said tone having the second   from where the first frequency is respectively transmitted so that the echo signals will be excluded by said   receiver means with a false alarm rate   when said tone having the second or   first frequency is received respectively.   25. Security system according to one of the   23 or 24, characterized in that said means   Constant False Alarm Rate Receiver Coil includes first (68) and second (72) filter circuits   narrow-band band pass, which are connected to the output   of said limiting circuit (66) and have frequency   these plants are approximately equal to the frequencies   of the said tones having the first and second   predetermined frequency.   26. Security system according to the claim   characterized in that said device (18, 20) comprises   further carries decoding means for decoding said coded audio signal comprising   logic circuit for detecting, during a sequencing   corresponding alternation, the presence of the aforesaid   having the first predetermined frequency and   the simultaneous absence of said tone possessing the   predetermined frequency, followed by the presence of   said tone having the second predetermined frequency   born and the simultaneous absence of said tone possessing   the first predetermined frequency.   27. Security system according to the claim   26, characterized in that the frequencies of said tonalities   with the first and second predetermined frequencies * mined are approximately equal to 6 kHz and at 7.3 kHz.   28. Security system according to any one   Claims 22 to 27, characterized in that said   device (18; 20) comprises a device (18) forming 8F552   signal relay relay, suitable for connection   electrically de-energized to a power supply line   in the protected space, said device   tif (18) forming a signal transmission relay comprising   communication transmission means in the power supply line so as to introduce said   alarm signal in said power supply line ac power supply.   29. Security system according to claim 28, characterized in that it further comprises: a control device (20) adapted to be   electrically connected to the power supply line   ac supply of the protected room, the said   control unit (20) comprising receiving means   communicator in the power supply line.   means for receiving said alarm signal from said signal transmission relay device (18), communication transmitting means in the power supply line for introducing a signal transmission relay;   signal from the controller in said power line   AC power supply, and processor means for enabling said means   in the said control device of   transmitting said controller signal in response to detecting said alarm signal; and - at least one slave device (22; 24; 26)   able to be electrically connected between the power supply line   AC energy supply and a device   alarm system so as to control the activation of said   alarm device, said slave device (22; 24; 26) having communication receiver means   in the power line to receive the-   said signal of the control device, output means for activating said alarm device and processor means for enabling said means 83552   output to activate said alarm device in response to detection of said control device signal. Security system according to claim 29, characterized in that said processor means located in said slave device (22; 24; 26) are adapted to apply a predetermined delay upon detection of said front control signal. of   enable said output means to activate the O10 says alarm device.   31. Security system, characterized in that it comprises detection means (12) for detecting   an intrusion into a protected premises and to produce a   intrusion signal in response to the detection of said intruder   if we; a device (18) forming a transmission relay   signals connected electrically to a power supply line.   alternating current in the protected room so as to introduce a coded signal from the relay into the AC power supply line by   response to reception of said intrusion signal; a disc   positive control (20) electrically connected to said AC power supply line for introducing a coded signal from the controller into   said alternating current power supply line   responsive to receiving said encoded signal from the relay;   a slave device (22; 24; 26) electrically connected   between said power supply line with   alternating power and an alarm device designed to   this alarm device in response to the reception of   said coded signal of the control device, said encoded relay signal and said coded control device signal comprising predetermined carrier frequency signals which are digitally modulated according to a pulse code modulation through the use of   of a complete cycle of the waveform present in the 83552   AC power supply generator for transmitting each information bit in said coded signals with a digital "1" corresponding to a carrier frequency pulse produced during an alternation of the waveform present in the power supply line in   energy & alternating current and a digital "0" corresponding to   at a pulse and carrier frequency produced during   the other alternation of the waveform present in the AC power supply line; processor means located in said device   (18) forming a signal transmission relay and   yens forming a processor present in said controller (20) to determine if other coded signals   are being transmitted through   the AC power supply line both before and during transmission respectively   said coded signal of the relay and said coded signal of the arrangement   control system, and to delay or invalidate the   respective transmissions in the event that another information is   mation is detected in said feed line AC power.   32. Security system according to the claim   31, characterized in that said process means   present in said relay device (18)   signal transmission and in said communication device   mande (20) are adapted to search for the presence of   said predetermined carrier frequency in said AC power supply line both before transmission of said respective coded signals and   during the unused alternation of the pre-existing waveform   feels in the power supply line   alternative during the transmission of the said respective dice.   33. Security system according to one of the   31 or 32, characterized in that said means 83552   forming a processor present in said device (18)   signal relay relay and in that   positive control (20) are further adapted to   during a random time interval following a determination that another information is present in said AC power supply line, before retrying   transmitting said respective coded signals.   34. Security system according to any one of   Claims 31 to 33, characterized in that said   processor means in said device   (18) forming signal transmission relay and in the-   said control device (20) are adapted to deter-   if noise levels exceed a predefined value.   terminated are present in said AC power supply line both before and during transmission of said respective coded signals and to delay or disable said respective transmissions   where excessive noise levels are detected   in the power supply line at current   ternatif. 35. Security system according to claim 34, characterized in that the processor means   present in said transmission relay device (18)   signal mission and in said control device   (20) are further adapted to wait during said   a range of random times occurring as a result of detecting excessive noise levels in said AC power supply line prior to any further attempt to transmit said respective coded signals.   36. Security system according to one of the   34 and 35, characterized in that said means   forming a processor present in said device (18)   signal relay relay and in that   Positive control (20) are suitable for finding the   excessive levels of noise in the power line   AC energy supply prior to trans-   mission of said respective coded signals and during the   the unused waveform of the AC power line waveform during the   transmission of said respective coded signals.