FR2744813A1 - Data transmission between domestic automation units and central controller - Google Patents

Abstract

The data transmission system includes the interface (26) between the network of automated devices (10,12,14,16,17,18,19) and the central controller (20). The interface converts signal formats to their destination formats. The programming and control signals are carried by a RS232 serial link, and the interface converts between serial format and TTL data transmission. The interface also provides signal voltage level adaptation (32,34), and provides compensation for transmission losses. A modulator-demodulator unit (38) is provided for communication via telephone connections. Switching is provided to allow communication between units.

Description

 The present invention relates to a data transmission system between a network of automats for managing domestic functions and a central control unit of these automats.

 Such data transmission systems allow centralized programming and control of the operation of a set of controllers equipping a home, such as heating management controllers, household appliances, alarm devices, etc.

 Data transmission systems are known of the type comprising a central control unit for automata comprising means for transmitting to said automata digital programming signals and digital signals for controlling operating parameters of an automatic machine, each assigned to an address header signal from said automaton for which they are intended, and means for receiving digital data signals representative of operating parameters of said automata sent by each of them in response to the reception of at least one of said programming and control signals sent to it by the central control unit.

 In systems of this type, each automaton is equipped with a signal processing unit capable of receiving and transmitting signals in the same format as that of the signals respectively transmitted and received by the central processing unit.

 In such systems, a wired link connects on the one hand the network of controllers and on the other hand the central control unit, which generates data losses during the transmission of signals.

 These systems consequently have numerous drawbacks, in particular with regard to their complexity and the necessarily limited number of automatic devices capable of being controlled by the central control unit, in order to maintain an adequate data transmission quality.

 The invention aims to overcome these drawbacks.

 It therefore relates to a data transmission system of the aforementioned type, characterized in that it comprises, arranged between said PLC network and the central control unit, a signal conversion interface intended to make them compatible. the formats of the signals exchanged by the central control unit and the PLC network.

The invention may further include one or more of the following features
- said programming and control signals being constituted by data signals transmitted in series by a serial link of the RS 232 type, said conversion interface comprises a data converter between a first format of data transmitted in series according to the RS 232 standard and a second data format transmitted according to TTL logic
the system comprises, arranged between said signal conversion interface and said network of automatons, means for adapting voltage levels of the data of said signals between a first data transmission value and a second value for processing said data, to compensate for transmission losses
the means for adapting voltage levels comprise two sets of transistors mounted as a common transmitter arranged one in said conversion interface and the other in each automaton and adapted to cause an increase in the voltage level of the data with a view to their transmission between the central control unit and said network of controllers and a corresponding lowering of the data voltage level for processing, respectively by the central control unit and each of said controllers;
the system further comprises a demodulator modulator circuit connected to a cable telephone network and to the voltage level adaptation means for the transmission, by said telephone network, of data signals between said network of automats, said unit central control unit and a second control unit connected to said wired telephone network
- said modulator-demodulator circuit includes ring detection means controlling a line socket current generator supplying signal transmission and signal processing means carried by the cable telephone network
said second central control unit being constituted by a telephone handset, said modulator-demodulator circuit comprises voice synthesis means in which are stored a set of digitized words and controlled by a microcontroller for transmission over a telephone line of the telephone network of a set of voice signals, and means for receiving control signals emitted by a user by means of said handset in response to said voice signals, comprising means for decoding said control signals connected to said microcontroller in view the transmission of decoded information to said network and to said central control unit
means for routing the signals transmitted between the first central control unit, the second central control unit and said network of automata with a view to the selective transmission of the signals emitted by one of these in the direction of at least one of the other two;
the switching means are constituted by a logic circuit constituted by the association of three AND gates ensuring a logical AND between the signals, considered two by two, transmitted by the first central control unit, by the second control unit and by said network of automata
each automaton of said automaton network comprises an interface for receiving programming signals transmitted by the central control unit, in which is stored an algorithm for extracting, from said header signal of the programming signal, data from addresses and an algorithm for comparing said address data with an address assigned to said automaton, and a household function management module in which is stored an algorithm for controlling household functions parameterized by means of the programming data transmitted by said programming signals
- the network of PLCs comprises at least one PLC chosen from a ge heating management automat, a PLC for managing the opening and closing of access to a home, an alarm management automat, a PLC management system for water distribution, an automaton for managing the opening and closing of blinds, an automaton for managing alarm clocks, and an automaton for managing a weather station
- said central control unit and at least one of said automats include a FSK modulator-demodulator circuit for the transmission of programming signals and control signals by carrier current, associated with a decoding circuit of the signals demodulated by the modulator circuit - demodulator.

Other characteristics and advantages of the invention will emerge from the following description, given solely by way of example and made with reference to the appended drawings in which
- Figure 1 is a block diagram of a data transmission system according to the invention;
- Figure 2 is a circuit diagram of the signal conversion interface of the data transmission system of Figure 1
- Figures 3 to 5 are diagrams illustrating the modulator-demodulator circuit of the data transmission system of Figure 1; and
- Figure 6 is a diagram illustrating a part of the circuit of a heating management automaton.

 FIG. 1 shows the general structure of a data transmission system between a set of automata, designated by the reference numerals 10, 12, 14, 16 and 18, a central unit 20 for controlling the automata, and a second unit 22 for controlling the automata.

 The PLCs are PLCs for managing domestic functions, arranged in a network.

 The PLC network includes, for example, a heating management automaton 10, a management system for the opening and closing of the accesses to a dwelling 12, an alarm management automaton 14, a heating management automaton. the water distribution 16, an automatic management system for the opening and closing of blinds 17, an automatic management system for a weather station 18 and an automatic alarm management system 19. They are arranged inside a house and connected by a wired link 24.

 The central control unit 20 is constituted by a microcomputer ensuring the centralized programming of the automata as well as the control of the operating parameters of these.

 The control unit 22 is constituted by a telephone handset.

 It can be seen in this FIG. 1 that the data transmission system comprises an interface circuit 26 connected to the central control unit 20 by a serial link 28 of RS 232 type connected to the serial port of the microcomputer, at the second control unit 22 and to the PLC network by the wired link 24.

 The interface circuit 26 includes a conversion circuit 30 ensuring the conversion of the signals transmitted by the serial link 28 into a format compatible with each of the automata and with the second control unit 22.

 It further comprises a circuit 32 for adapting the voltage levels of the programming and control signals exchanged between the central unit and the automata between a first value for data transmission over the wired link 24 and a second value for processing said data. given by the central control unit 20 and the control unit 22.

 The adaptation circuit 32 cooperates with a complementary conversion circuit 34 disposed at the input of each of the automata and adapted to ensure an adaptation of the voltage level of the signals between the value of data transmission on the wired link 24 and the second value of data processing by PLCs.

 The control unit 22 is arranged at a distance from the rest of the data transmission system. It is connected to a telephone line 36 of a wired telephone network and dialogues with the central control unit 20 and with the automata via a modulator-demodulator 38 connected to the interface 26.

 The data transmission system is completed by a routing circuit 40 ensuring the selective transmission of the programming signals and the control signals exchanged between the central control unit 20, the control unit 22 and the network of automata. .

 The detailed description of the transmission system will now be described with reference to FIGS. 2 to 6.

 The description of the interface circuit 26 will first of all be made with reference to FIG. 2.

 This interface circuit is connected to the PLC network by the wire link 24 via a first data transmission terminal T and a second data reception terminal R.

 The terminals R and T are connected to the conversion circuit 34 (FIG. 1), formed by the association of three NPN transistors Q1, Q2 and 93.

 The data transmission terminal T is connected to the collector of the first NPN transistor 91 and, via a first resistor R1 to a DC voltage supply source delivering a DC voltage of 24 volts.

 The emitter of transistor Q1 is connected to ground. It is also connected to the emitter of the second transistor Q2, the base of which is connected to the data reception terminal R and, by a resistor R2 to the DC voltage source.

 The collector of transistor Q2 is connected to the base of the third transistor Q3, the collector of which is connected to a DC power source delivering a DC voltage of 5 volts and whose emitter is connected to ground.

 Furthermore, the collector of transistor Q3 is connected to a first input terminal of an AND gate P1, the output of which is connected to a terminal 42 for connection to the modem 38 (FIG. 1).

 The other input of the AND gate P1 is connected to an output terminal PA1 of output "TTL" of the converter circuit 30 ensuring the conversion of the data signals transmitted by the microcomputer 20 according to the RS 232 standard into data signals transmitted according to a TTL format compatible with PLCs.

 Furthermore, the input terminal PA2 "RS232" and the output terminal PA3 "RS 232" of this conversion circuit 30 are connected to a terminal 44 for connection to the serial port of the microcomputer 20.

 Furthermore, the collector of transistor Q3 is connected to the input of a second logic gate P2, the other input of which is connected to the terminal 42 for connection with the modem 38. The output of the logic gate P2 is connected to a PA4 input terminal "TTL" of the converter circuit 30.

 Furthermore, the output terminal PA1 "TTL" of the converter circuit 30 is connected to the second input of the gate P1 and to an input of a third AND gate P3, the other input of which is connected to the connection terminal 42 to modem 38, this other input being further supplied via a link resistor R3 by the DC supply voltage source at + 5 volts.

 The output of the AND gate P3 is connected to the base of the first transistor 91.

 This circuit is completed by a conventional set of capacitors C1, C2, C3 and C4 for stabilizing the power supply of the converter 30, by two capacitors C5 and C6 ensuring the decoupling of the power supply of the converter 30 as well as by an indicator 45 of display of faults likely to appear on the network, connected to the output terminal of the first logic gate P1 by a link resistor R5 and by a logic gate P4 for adapting the logic level.

 The operation of this circuit is as follows.

 When the central control unit 20 transmits a programming signal, this is present on terminal 44 and sent to the input terminal PA2 "RS 232" of the converter circuit 30. This circuit ensures the conversion of this signal programming in TTL format and delivers, on its "TTL" PA1 output terminal, the signal converted on the one hand to terminal 42 and to modem 38, and on the other hand, at the base of transistor Q1, by the intermediate of the routing circuit constituted by the logic gates P1, P2 and P3.

 This transistor Q1, associated with the transistors Q2 and 93, raises the voltage level of the data conveyed by the programming signal converted with a view to their transmission on the wire link 24, in the direction of the automata, without loss of transmission.

 As mentioned earlier, the data of the converted signal is in TTL format. According to this format, the high level of the data corresponds to a voltage of 5 volts and the low level corresponds to a zero voltage.

 The transistors 91, Q2 and Q3 convert the low level of the data to a high level corresponding to a voltage of 24 volts, and convert the low level of the data of the programming signal converted into a zero voltage.

 The data thus converted are transmitted to the PLC network via the data transmission terminal T connected to the wired link 24.

 Similarly, the signals received on terminal R, coming from the automata, undergo a corresponding conversion. These signals are signals for controlling the operating parameters of the automata, emitted by the latter in response to an interrogation signal from the central control unit 20 or the control unit 22.

 The data, conveyed by these control signals, are presented on the basis of the transistor Q2.

 As will be described in detail below, the high level of these data corresponds to a voltage of 24 volts and their low level corresponds to a zero voltage.

Transistors 91, Q2 and Q3 convert the high level of this data into a zero voltage and convert the low level of this data into a high level corresponding to a voltage of + 5 volts.

 These signals, emitted by each of the automata for example in response to a programming signal emitted by the central control unit 20 or by the control unit 22 are routed, after conversion, on the one hand to the modem, and d on the other hand to the central control unit after having been converted to RS 232 format by the converter circuit 30.

 Furthermore, the programming signals coming from the control unit 22 are routed to the data transmission terminal T, after having been converted, as mentioned previously by the transistors Q1, Q2 and 93, into a data transmission format and, to the central control unit 20, after having been converted there to RS 232 format.

 The description of the modem 38 circuit will now be made with reference to FIGS. 3 to 5.

 This modem allows a dialogue between on the one hand the control unit 22 and on the other hand the central control unit 20 and the network of automata.

 As mentioned previously, the control unit 22 is constituted by a telephone handset, but of course other types of control units can be used, such as for example a microcomputer.

 As shown in FIG. 1, the telephone handset 22 is connected to the modem by a telephone line 36 of a cable telephone network.

 The modem includes a circuit for interfacing with the telephone line to which it is connected, represented in FIG. 3, a voice synthesis and decoding circuit for the signals transmitted by the telephone line, represented in FIG. 4 and a management circuit the operation of the modem shown in Figure 5.

 Referring first to FIG. 3, it can be seen that the interface circuit includes a ring detection circuit 46 connected to a pin 48 for connection to a telephone line.

 The ringing detection circuit 46 is a circuit of known type, arranged around an opto-coupler 50 whose output is connected to an integrator 52, constituted by the association of a resistor R6 and a capacitor C7 adapted to convert the ringing signals, having a known frequency of 25 hertz, into a continuous signal. The integrated signal, delivered by the integrator circuit 52 is supplied to a port PB1 of the modem management circuit via two logic gates P6 and P7.

 Referring to FIG. 5, it can be seen that the modem management circuit is constituted by a microcontroller 53 of known type in which an algorithm for piloting and managing the modem is stored. This algorithm is of the classic type and will therefore not be described in detail below.

 The interface circuit further comprises a line tap current generator circuit constituted by a Norton generator 54 adapted to deliver a line tap current of 35 milliamps when the microcontroller 53 has sent a line tap command. .

The generator circuit of Norton 54 is connected to a transformer TR1 itself connected to the telephone line
L, by means of a clipping circuit 56 constituted by the association of two diodes D1 and D2 in anti-parallel adapted to ensure an adaptation in impedance of the interface circuit to the wired telephone network as well as a galvanic isolation with the telephone line L to which the clipping circuit 56 is connected.

 Furthermore, the clipping circuit 56 is connected to the emitter of a transistor Q3, the base of which is connected to a port PB2 of the microcontroller 53 (FIG. 5). The collector of transistor Q3 is connected to the primary winding of an electromagnetic actuator 57 of a switch 58 connecting the ring detection circuit 46 to the Norton generator circuit 54.

 The primary winding 57 of the electromagnetic actuator 58 is also connected to a port PB3 of the microcontroller 53, allowing the interface circuit to be put into service and out of service.

 The operation of this interface circuit is as follows.

The rings, detected by the ring detection circuit 46 are delivered to the port PB1 of the microcontroller 53. The latter, counts the number of rings and, as soon as a predetermined number of rings is reached, it sends a signal on its port
PB2. The transistor Q3 is then saturated which causes the closing of the electromagnetic actuator 58 and therefore the generation of line tap current.

 Furthermore, the microcontroller 53 positions its port PB2 at a high level to cause the contactor 58 to close in order to send data to the control circuit 22 (FIG. 1).

 It should be noted that the various characteristic stages of the operation of this circuit are displayed and identified on a set of indicator lights 59-a, 59-b and 59-c.

 The circuit for voice synthesis and for decoding the signals received by the demodulator modulator will now be described with reference to FIG. 4.

The voice synthesis circuit is constituted by the association of two voice synthesis circuits 60 and 62 of known type, for example constituted by circuits of ISD 1020 type. They are each connected to the PCO ports,
PC1, PC2 and PC4 of the microcontroller 53 (Figure 5).

 They each include a memory in which digitized keywords are stored allowing the modem, under the control of the microcontroller 53 to dialogue with an interlocutor. The microcontroller 53 combines these keywords in order to construct sentences constituting a drop-down menu, these sentences being delivered to the telephone line L by an output port PC5 of these speech synthesis circuits.

 To perform this combination of digitized words, the speech synthesis circuits 60 and 62 are respectively connected to the output of two OR gates 64 and 66, the inputs of which are connected to the ports PC6, PC7 and PC8 of the microcontroller 53.

 In response to the sentences sent by the voice synthesis circuits 60 and 62, under the control of the microcontroller 53, the user presses a key on his telephone handset corresponding to a menu selected by the user.

 Pressing a key on the telephone handset generates an encoded audio signal, of the DTMF type, transmitted by the telephone line L. This signal is received by the modem and in particular by the signal decoding circuit.

Referring to FIG. 3, the decoding circuit comprises a high-pass filter 68, an amplifier 70 disposed at the output of the high filter 68 and the output of which is connected to a low filter 72. The filtered and amplified DTMF data are presented at the input of a DTMF 74 decoding circuit connected to the ports PC9, PC10,
PC11, PC12 and PC13 of the microcontroller 53 and ensuring the conversion of the DTMF signals into digital data which are then delivered to the microcontroller 53.

 This circuit is completed by the association of two diodes D3 and D4 preventing the audio signals delivered by the speech synthesis circuits from entering the DTMF 74 converter circuit.

 The circuit which has just been described with reference to FIGS. 3 to 5 thus allows a dialogue between the micro-controller 53 and a telephone handset and between the telephone handset and the micro-controller 53.

 With particular reference to FIG. 5, the signals received by the microcontroller 53 from the telephone handset, via the modem, are delivered to the central control unit 20 via a terminal connection 76.

 Likewise, the signals coming from the central control unit 20 are supplied, via the connection terminal 76, to the microcontroller 53 for the transmission, in the direction of the telephone handset 22, of information. carried by these signals.

 It is thus possible to configure and program the PLCs remotely and to obtain, also remotely, information relating to the operating parameters of each of these PLCs.

 The description of one of the domestic function management machines will now be made with reference to FIG. 6.

 This figure shows the electronic circuit of the heating management automaton 10.

The other PLCs connected to the network have a similar structure, which differs from that of the heating management automaton only because of the nature of the domestic function to be performed. These automata will therefore not be described in detail below.

 Referring to FIG. 6, the signals transmitted by the central control unit 20 and by the control unit 22 are available on a terminal R for receiving signals.

 As mentioned previously, these signals are digital data signals in the TTL format and whose high level corresponds to a voltage of 24 volts and whose low level corresponds to zero voltage.

 These data are presented at the input of a signal conversion circuit in a data processing format, designated by the reference numeral 78.

 This conversion circuit 78 is constituted by the association of three transistors Q4, Q5 and Q6 adapted to convert the high level of the data of the incident signals to a low level corresponding to a zero voltage and to convert the low level of the data of the incident signal at a high level corresponding to a voltage of 5 volts. These converted data are available on the collector of the first transistor Q4 and are presented on a PDO input of a microcontroller 80, for example a microcontroller of the 68711D3 family.

 All the PLCs connected to the PLC network are also equipped with a similar microcontroller and a data format conversion circuit as described above. Thus, the data presented at the input of one of the automata, such as the heating management automaton, are also presented at the input of all the automata on the network.

 As mentioned previously, the signals emitted by the control units 20 and 22 towards the PLCs of the network consist of programming signals from the PLCs. These programming signals comprise a useful signal of programming data and control of the operating parameters of each automaton and a addressing header signal of one of said automata for which the programming signal is intended.

 The microcontroller 80 comprises, in known manner, means for storing an algorithm for extracting the header signal for the recovery of address data and an algorithm for comparing these address data with a address assigned to a corresponding PLC to ensure, among the signals presented on its PD0 input, the selection of the signals intended for it.

 If the signals received are not intended for the PLC to which it belongs, these signals are ignored.

 On the other hand, if the address data extracted from the header signal correspond to the address assigned to this automaton, the data of the useful signal is processed by the microcontroller 80 and sent to a heating management module 81 (FIG. 1) also constituted by a microcontroller.

 For example, for the heating management PLC, this data is heating programming data.

 It is therefore possible to remotely and centrally control the programming of all the radiators in a home.

 In the example shown, the heating management automaton makes it possible to manage the heating of two zones, respectively Z1 and Z2 of a dwelling.

 It is thus possible, using the data transmitted by the control units 20 and 22 (FIG. 1) and supplied to the heating management module 81, and by means of a conventional heating management algorithm stored in this module. 81, to control the heating of the radiators located in each of its zones.

 To this end, the microcontroller 80 sends to control devices for these radiators, respectively 10a, 10b, 10c, 10d and 10e (FIG. 1) of known type, temperature setpoint data for these control devices.

 Thus, the microcontroller 80 provides, on its output legs PD2, PD3 and PD4 standby temperature setpoints for the zone Z1, and on its output legs PD5, PD6 and PD7 standby temperature setpoints for the area Z2.

 Similarly, it provides, on its output legs PD8 and PD9, a signal for controlling the heating of zones Z1 and Z2 respectively and, on an output leg PD10, a signal for controlling the frost-free function for all of the house.

 Furthermore, the microcontroller 80 transmits, in response to a query sent by one of the control units 20 and 22, control data relating to the operating parameters of the heating controller.

 It thus gives the control units information relating to the operation of the heating controller, and in particular relating to the different set temperatures, to the heating control signals of zones Z1 and Z2, and to the control signal for the off function. gel.

 These control data are delivered by an output signal from a tab PD1 of the microcontroller 80 connected to the conversion circuit 78, and in particular at the base of transistor 06.

 This data is converted by this conversion circuit 78 into a transmission format on the wired link 24. To do this, the high level of the data delivered by the tab PD1 is converted into a low level corresponding to a zero voltage and the low level data delivered by the PD1 tab is converted to a high level corresponding to a voltage of 24 volts.

As mentioned previously, this data flows over the wired link 24 and is then received by the interface circuit 26 (FIG. 1). They are then converted by the converter circuit 32 from the data transmission format to data processing format by the converter circuit 32, then are routed, as mentioned previously, by the routing circuit 40 in the direction of one of the units. 20 and 22.

 The invention which has just been described is not limited to the embodiment mentioned.

 In the embodiment described, the transmission system comprises a central control unit, a control unit connected to the system by a telephone line and a set of automata.

 It is however possible to use only one control unit, such as the central control unit 20 or the central control unit 22.

 The transmission system as described allows the programming and the control of the operation of each automaton of the network by transmission of programming and control signals on the wired link 24 to which each automaton of the network is connected.

 Referring to FIG. 1, it is however possible, as a variant, to dialogue with one of the automata, such as the alarm management automaton, by carrier current.

 This allows simple programming and control of an assembly consisting of a large number of alarm clocks, individually or simultaneously using addressing means of known type.

 To carry out this dialogue, the telephone handset 22 as well as the central control unit and each automaton comprise a modulator-demodulator circuit, respectively 19a, 20a, of the FSK type and intended to allow an exchange of programming and control signals by current. carrier.

 They are each associated with a decoding circuit, respectively 19b, 20b, of the signals demodulated by a corresponding FSK modulator-demodulator circuit for further processing.

 The FSK modulator-demodulator circuits and the coding circuits have a known structure and will not be described in detail.

 Furthermore, the invention is not limited to the transmission of data to the machines as described.

It is indeed possible from the data transmission system to manage a single controller or any number of such controllers.

Claims (12)

 1. Data transmission system between a network of automata (10,12,14,16,17,18,19) for managing domestic functions and a central unit (20) for controlling said automata, said central unit (20 ) control comprising means for transmitting to said automata digital programming signals and digital signals for controlling operating parameters of an automaton (10,12,14,16,17,18,19), each assigned 'an address header signal of said automaton for which they are intended, and means for receiving digital data signals representative of operating parameters of said automata (10,12,14,16,17, 18,19) sent by each of them in response to the reception of at least one of said programming and control signals sent to it by the central control unit (20), characterized in that it comprises, disposed between said network of PLCs (10,12,14,16,17,18,19) and the central control unit (20), one signal conversion interface (26) intended to make the formats of signals exchanged between the central control unit (20) and the network of controllers (10,12,14,16, 17,18,19) compatible with each other .  2. Data transmission system according to claim 1, characterized in that said programming and control signals being constituted by data signals transmitted in series by a serial link (28) of RS 232 type, said interface (26) conversion comprises a data converter (30) between a first format of data transmitted in series according to the RS 232 standard and a second format of data transmitted according to the TTL logic.  3. Data transmission system according to one of claims 1 and 2, characterized in that it further comprises, disposed between said interface (26) for converting signals and said network of automata (10,12,14 , 16,17,18,19), means for adapting (32,34) the voltage levels of the data of said signals between a first data transmission value and a second processing value of said data, with a view to compensation transmission losses.  4. Data transmission system according to claim 3, characterized in that the voltage level adaptation means comprise two sets of transistors (01, Q2,03,04,05,06) mounted as a common transmitter arranged the one in said conversion interface (26) and the other in each controller and adapted to cause an increase in the voltage level of the data with a view to their transmission between the central control unit (20) and said network of controllers ( 10,12,14,16,17,18,19) and a corresponding lowering of the voltage level of the data for processing, respectively by the central control unit (20) and each of said automata.  5. Data transmission system according to one of claims 1 and 4, characterized in that it further comprises a modulator-demodulator circuit (38) connected to a cable telephone network (36) and to the adaptation means ( 32, 34) of voltage levels for the transmission, by said telephone network (36), of data signals between said network of controllers, said central control unit (20) and a second control unit (22) connected to said wired telephone network (36),  6. Data transmission system according to claim 5, characterized in that said modulator-demodulator circuit comprises means (46) of ring detection detecting a generator (54) of line tap current supplying means (53) d transmitting signals and processing signals carried by the cable telephone network (36).  7. Data transmission system according to claim 6, characterized in that said second central control unit (22) being constituted by a telephone handset, said modulator-demodulator circuit (38) comprises voice synthesis means (60,62 ) in which are stored a set of digitized words and controlled by a microcontroller (53) for the transmission over a telephone line (36) of the telephone network of a set of voice signals, and means for receiving signals control transmitted by a user by means of said handset in response to said voice signals, comprising means for decoding (74) said control signals connected to said microcontroller (53) for the transmission of decoded information to said network PLCs and to said central control unit (22).  8. Data transmission system according to any one of claims 5 to 7, characterized in that it further comprises switching means (40) of the signals transmitted between the first central control unit (20), the second central control unit (22) and said network of automata (10,12,14,16,17,18,19) for the selective transmission of the signals emitted by one of them towards at least one of the other two.  9. Data transmission system according to claim 8, characterized in that the switching means are constituted by a logic circuit (40) constituted by the association of three AND gates ensuring a logical AND between the signals, considered two to two, transmitted by the first central control unit (20), by the second control unit (22) and by said network of automata (10,12,14,16,17,18,19).  10. Data transmission system according to any one of claims 1 to 9, characterized in that each automaton of said automaton network comprises an interface (80) for receiving programming signals transmitted by the central control unit, in which is stored an algorithm for extracting, from said header signal of each programming signal, address data and an algorithm for comparing said address data with an address assigned to said controller, and a module (81) for management of household functions in which is stored an algorithm for controlling household functions parameterized by means of the programming data transmitted by said programming signals.  11. Data transmission system according to any one of claims 1 to 10, characterized in that the network of controllers comprises at least one controller chosen from among a heating management controller (10), a management controller. opening and closing of the accesses to a dwelling (12), an automatic alarm management machine (14), a water distribution automatic machine (16), an automatic management system for opening and closing blinds (17), a weather station management machine (18), and an alarm clock management machine (19).  12. Data transmission system according to any one of claims 1 to 11, characterized in that said central control unit (20) and at least one (19) of said automata comprise an FSK modulator-demodulator circuit (19 -a, 20-a) for the transmission of the programming signals and the control signals by carrier current, associated with a decoding circuit (19-b, 20-b) of the signals demodulated by the modulator-demodulator circuit ( 19-a, 20-a).