Remote control system

sensors and response signal indicators are connected to the loop control system.

A plant of this kind for use in general measurement and control technology is known as a combined part-line plant, cf. Elektronik 1972, p. 331 ff, 1973, p. 300 and 1974 p. 289 ff and 345 ff. Such facilities have in common that the receivers connected to the ring line system can be controlled optionally from the transmitter according to the multiplex principle, so that connections with several wires from the transmitter to each individual receiver can be eliminated, while at the same time the unambiguous coordination with a specific receiver and thus a specific information content is not lost during data processing. 1 in the transmitter.

The addressing of the controlled access to the currently, current receiver from the transmitter and the design of the transmitter and_:the receiver cooperating herewith via the ring line system depends on the actual case of use, so that a functional sequence developed for a specific use of such a pair line system for multiplex operation via the ring line system can only very rarely · without basic intervention be transferred to a use case = of another kind. In particular those in the specified sections of the journal in

The electronics shown in the electronics are thus not automatically useful for the special requirements which apply to a remote control system in a motor vehicle, since a control system adapted to the condition of motor vehicle operation may e.g. after triggering an operating function * do not block other possible operating functions (compare Elektronik 1974,!

sid. 289 ff and 345 ff). One suitable for the vehicle's electrical equipment! remote control system on the basis of a ring line system may, as a result of the requirement to control certain consumers and possibly also;

monitor their correct function nor is it adapted to the mere demand for digitized measured values ​​as is the case in Elektronik 1972 ,:

sid. 331 ff. Finally, it should be noted that the advantage of saving wiring material and work for laying multiple wires and wiring bundles is not again eliminated by unreasonable costs with respect to the electronic equipment for multiplex operation via a ring * wiring system. ,:

With regard to accessories for motor vehicles, to which also it.

electrical equipment can be counted, these are articles, which give:

By standardizing versatile basic functions, it must be possible to attribute them to mass articles. These basic functions must be of such a nature that a remote control system for the vehicle can be^J’ .

7600940-6 is set in a basic design with few economically manufacturable standard components and, if necessary, depending on the requirements in each individual case, can be extended without interfering with such a basic design. A remote control system of the type specified at the outset is known from German Publication No. 2,350,891 and is adapted taking into account these views to the special motor vehicle technical requirements. However, this known system does not only have the disadvantage that within each counting period, which due to its function below is also called election control period, in principle only enables operation of a single of all operating switches (corresponding control of a single of all current consumers) in combination with a special rank or preference coupling with regard to the operation of an operating switch for a consumer of special importance. In this known system it is also unfavorable that in order to carry out the decoding on the receiving side a ring line system is required, which comprises a plurality of clock pulse and control lines. Some wires in this wiring system are interrupted directly from the transmitter to all receivers, while other wires must be looped in the receivers, so that intervention in the wiring system itself is required to change the number of receivers connected to the wiring system or to regroup according to other local planning by division or joining wires. As a result, critical operational uncertainties and faulty connections can arise.

The invention is therefore based on the task of further developing the initially specified remote control system in such a way that, on the one hand, as few separate lines as possible are required in the ring line system, to which a practically unlimited number of consumers can be connected without increasing the number of components for their individual control. ..Consumers must be able to be connected in any order, so that interruptions in the management system in these places are not absolutely necessary. The coding of the individual consumers must be carried out in such a way that, despite a large number of individually controllable consumers, no appreciable time elapses between the operation of the coordinated operating switch and the consumer's reaction and that a safe reaction only takes place at a selected consumer. In order to achieve such an economical control system that it can replace the vehicle's usual electrical equipment to any extent for economic reasons, the system must consist of as few standardized coupling units as possible, which can be used versatile and modified by comparatively few

7600940-6 ₄

- ί additional couplings or which may be interchangeable to achieve, 'that depending on the convenience offered, at first a more or less simplified embodiment of the system can be built into the motor vehicle and later also extended without interfering with this basic design. The facility must also be dimensioned in such a way / that the optionally controllable consumers can both be consumers in the true sense but also partly such controllable functional elements in the broadest sense. The concept of consumer shall thus within the scope of the invention thus also include in particular actuating elements, measuring sensors and the like connectable to the ring line system.^!

This task is solved according to the invention by including in the loop line system a response line, which in the central transmitter is | connected to one of the inputs of response comparators, the other 'inputs of which are connected to each of the operating switches * Each receiver contains a two-input response-blocking stage, whose output is connected to the response line and whose one input is connected to the output of the coincidence stage and whose other input is connected to the receiver's response signal transmitter. ;

The solution according to the invention is readily suitable for promotion_tthe transition from a conventional electrical equipment of a motor vehicle to a remote control system based on the ring control system. This is achieved mainly by the fact that the operating switches are located in the central transmitter and simple addressing of the consumers is used, which is determined by the counting state, together with the corresponding simple decoding in the counter. tagarna. Combining the operating switches to the transmitter does not in practice impede any obstructive limitations, since in the case of a motor vehicle the control elements are arranged in all conditions in ·! the surroundings of the steering wheel, ie already locally concentrated, so that demand for the operating switches via special in the ring line system in the incoming receivers is not required. At least with regard to basic | The transfer also does not require the transfer of information regarding the nature of the consumer's information, since each consumer is selected via a^fown receiver, so that through the coordination of the operating switch just; this predetermined task for the selected consumer is triggered.?

As a result of e.g. Inspection regulations for motor vehicles and requirements for comfort for the vehicle driver are required, that operating readiness and correct operation of certain consumers and any measured values ​​and the like are indicated for the vehicle driver. * ·

For this purpose was used in each recipient, from whose consumer | a response signal is expected, the request for decoding ^ ste- j

7600940-6 is provided for coding the information to be provided, and in the central transmitter coordination takes place with a specific measuring or indicating device by means of a coding carried out with the aid of corresponding operating switches, by means of which this particular receiver is activated.

The invention is described in more detail below in exemplary form with reference to the accompanying drawing, in which Fig. 1 shows an overview diagram of a remote control system with a central transmitter and five consumers with previously connected receivers and a pulse diagram to illustrate selection control of a fourth consumer, Fig. 2 a detailed block diagram of a central transmitter according to Fig. 1 according to a first embodiment, Figs. 3 a detailed block diagram of a particularly suitable embodiment of a receiver according to Fig. 1 with consumer and response signal transmitter, Fig. 4 a wiring diagram, concerning an advantageous further development of a transmitter according to Fig. 2, Fig. 5 an advantageous adapted to the transmitter according to Fig. 2 further development of a receiver according to Fig. 3 and Fig. 6 is a block diagram of an embodiment of an operating switch in the transmitter according to Figs. 2 and 4 in a key embodiment.

According to Fig. 1, a ring or loop line system 106 consists of four different lines, namely a clock pulse line 117, a control line 129, a response signal line 145 and a supply line 114, which runs over a non-fixed rod 1 ii in the jar. connected to a voltage source 107, in particular the battery of the motor vehicle. This four-wire ring line 106 extends through the entire vehicle in which the plant according to the invention is used, and connects via a central transmitter 110 the operating elements normally arranged in the vicinity of the vehicle steering wheel or the operating switches 123 indirectly to all coordinated electrical consumers provided with each receiver 111 and by means of these can be connected to arbitrary places on the line system 106. The hitherto complicated wiring of the vehicle's electrical equipment is thus substantially reduced to the laying of this single wiring system 106 with four wires. For the line system 106, a multi-conductor cable is advantageously used, which is marketed under the name Scotchflex. Since the conductors in such commercially available cables have equal cross-sections but on the other hand the required larger cross-section is required for the supply line 114, through which high current is transmitted, than for the other lines in the line system, which only need to transmit control and measurement signals, it is expedient for the supply line 114 to connect a larger number of conductors lying side by side in the cable in parallel. In practice, a special busbar is placed along the line system 106 for feeding the bypasses with high power, which for simplification purposes is not shown in the figure.

The clock pulse line 117 is supplied from the transmitter 110 with a series of clock pulses, each of which is separated from one another by means of a control signal, preferably a control pulse. As can be seen from the upper diagram in Fig. 1, the control pulse preferably consists of a clock pulse pause with a length which is several times greater than the length of each individual clock pulse.

The control line 129 transmits only one signal when at least one receiver 111 and thus the consumer 122 coordinated therewith is controlled from the transmitter 110 during a selection control period. In view of the overview diagram shown in Fig. 1, it is assumed that the fourth consumer 122.4 is just controlled via the fourth operating switch 123.4 in the transmitter 110, while all other consumers 122 are not operated at this time. Then the control line 129 transmits only a switching pulse characteristic of this fourth switch 123.4, as can be seen from the diagram shown in the lower figure in Fig. 1.

The sewing signal line 145 in the line system 106 is required only when an operating system is to enable the transmission of information on operational readiness and correct operation of a consumer 122 selected from the transmitter 110, whereby discretely operated measuring and coupling devices requested from the transmitter 110 must also be included. For indication, response signal indicators 148 were used.

Fig. 2 shows the diagram of a first embodiment of a central transmitter 110 according to Fig. 1. The transmitter 110 contains a free-swinging, and as symmetrical multivibrator clock clock generator 112, which like all components for its voltage and energy supply is connected to the supply line 114 in the wiring system 106. The series of clock pulses at the output of the generator 112 drives a counting switch 115, which in addition to its zero state can assume at least as many different counting states as the number of receivers 111 with consumer 122 can be selected from the transmitter 110. A counting period after which the counting switch 115 other causes have returned to their initial state, is in this case called the election control period, since each consumer 122 in fig. 1 within such a counting period can be selected once via the control line 1291 This selection frequency and thus the length of the selection control period can practically be selected. arbitrarily increased by a corresponding increase in the clock pulse repetition frequency at the output of the generator 112, so that in practical use^?operation of the control system any time difference between manual nine-actuation of certain operating switches 123 and the corresponding reaction · ₇ 7600940-6 of the coordinated consumers 122 can also not be noticed, when in correspondence with a very large number of optionally controllable consumers 122 an election control period is composed of a correspondingly large number of different counting states, which must be traversed one after the other. For the sake of clarity, in Fig. 2, as in Fig. 1, only 5 operating switches 123 are shown, so that a selection control period comprises six counting states. The corresponding series of clock pulses is transmitted via line 117. Before the transition from one selection control period to the next, the series of clock pulses which control the counting circuit 115 is interrupted by a control pulse which is also output to the line 117. For this purpose a control pulse sensor is connected after the generator 112 which is activated by the reset pulse after output of the control pulse, enumeration in the counting switch 115, ie the course of the next selection control period, is released again.

The control pulse may differ from the clock pulses on line 117 by its amplitude. However, more sensitive to noise than amplitude difference is e.g. polarity difference, so that two series of clock pulses can be separated by means of a control pulse with deviating polarity. In this case, however, the control encoder consists of a pulse length forming step 155, which is initiated by means of the reset pulse of the counting switch 115 and by briefly blocking the clock pulses emitted from the generator 112, produces a pulse pause which is several times longer than each individual clock pulse. Fig. 1 shows the diagram. Such as a pause of a certain length between two determined pulse series equipped control pulse has in comparison with amplitude difference the advantage of being more insensitive to disturbances and in comparison with polarity difference the advantage of being able to be generated and detected in a simpler way, because one can work with unipolar signals. Above all, however, such a pulse pause, which forms the control signal, can be achieved in a particularly simple manner from a switching point of view, namely by means of a circuit shown in fig. 2 shown AND gate 157 and a monostable rocker step 158 as time elements for determining the length of the pulse pause. As shown in Fig. 2, it is expedient to use this during the clock pulse pause or during the control pulse to immediately block the generator 112 and then trigger it again, so that the counting periods cannot be disturbed due to incomplete clock pulses.

In the case of comparatively small numbers of operating switches 123 present at the transmitter 110, it is expedient to let the counting switch 115 simply consist of a shift register feedback from the last to the first stage, i.e. a so-called ringing counter, thus

The 7600940-6 gene on the last register cell corresponds to the transfer output of a counter switch 115. The feedback line is further connected to the setting input for setting the monostable toggle stage 158 to its unstable state. With each clock pulse input to the counting switch 115, it is advanced one counting step, the output signal from the counting step 115 passes in step with the clock pulses from one counting output to the next, where it remains until the next clock pulse appears. In this embodiment, an operating switch 123 is connected to a counting output, which thus serves as a switching pulse output 120. The coding for this optional control of consumer 122 thus in this simple embodiment consists only of a coordination of the operating switches 123 with the individual counting outputs on the counting switch 115. The centrally located connections on all switches 123 are connected to the control line 129 via an OR gate 119 and a pulse-forming coupling 128.

The diagram included in Fig. 1 corresponds to the instantaneous operation of the operating switch 123.4 in for optional control of the receiver 111.4 to select the consumer 122.4 in Fig. 1. the fifth clock pulse occurs, an output signal at the fourth count output and thus yia the fourth switch 123.4, so that a switching pulse no. 4 coincides with this momentarily transmitted fourth clock pulse to line 117 in the current election control period. This coincidence was used to pass the consumer 122.4 into the receiver 111.4, as described in more detail below.

In the case of a consumer 122.4 of such kind, from which one. response signal is sent to the transmitter 110, a response signal pulse appears on line 145, while the fourth clock pulse is present in the currently current selection control period. To evaluate this response signal, according to Fig. 2, all switches 123 with their connection facing away from the coupling 115 in a response signal comparator 144 are connected to one input of each AND gate 121. The second input of all gates 121 is connected to line 145. While the signal from the fourth counter output appears at the count switch 115 and a response signal pulse appears on line 145 and the operating switch 123.4 is closed, the coincidence requirement for gate 121.4 is met and an acid signal indicator 14 emits. , e.g. a light signal or an acoustic signal having a specific information content for the vehicle driver operating this operating current adjuster.

7600940-6

Fig. 3 shows in more detail an optionally controllable receiver 111 from a transmitter 110 according to Fig. 2 with a consumer 122 and with a response in the grating sensor 149. In a receiver counter 130 connected to the line 117, the clock pulses / which arrive from the beginning of each selection control period are also counted. as well as in the counting switch 115 in the transmitter 110. All counters 130 are reset to their initial state / which means synchronization of the control system / at the beginning of each selection control period, which takes place under the influence of the control pulse / which separates two consecutive clock pulse series and which is separated from the signals on line 117 by a control pulse detector 156. This detector 156 is in this case suitably constructed as a time circuit / which is fixed to a working time / which lies between the length of a control pulse and the length of a clock pulse. This timing circuit suitably consists of a monostable toggle stage 159 / which, by means of each setting signal / which occurs at the setting input before the end of its unstable time or reset time / is readjusted to the initial state of its unstable switching state. The reset to the steady state thus takes place only / if no new setting signal does not appear at the setting input for at least the time of the technically predetermined reset time_z which, however, in the present case occurs exclusively during a clock pulse pause_z that is, when a control pulse occurs on line 117. Upon resetting to the steady state, the counter 130 is set from the output of the flip-flop 159 to its count start state and the count takes place in the counter 130 from the first clock pulse / which arrives after the control pulse via line 117. At all receivers 111 connected to the line system 106, this combination of a control pulse detector 156 and a receiver counter 130 / is present, so that all counters 130 during each selection control period count synchronously with the count switch 115 in the transmitter 110..

For coding the receivers 111 / ie to coordinate the operating streams 123 in the transmitter 110 with at least one receiver 111 / each receiver is provided with a decoder 131 / which emits only one output signal / when as a result of operation of the coordinating switch 123 coincidence occurs between the counter coordinated with this switch 123 in the state of the counter switch 115 / ie feeding of a switching pulse via the control line 129 _z with the same counting state at the output of the counter 130. This coincidence condition is sensed by a coincidence step 135 / via the output of which when the consumer 122 is driven, which is connected to the respective receiver 111 and which is optional

7600940-6 ₁₀ is controlled from the transmitter 110. If the receiver 111.4 shown in Fig. 3 and coordinated with the fourth switch 123.4 is considered, the fourth count output on the counter 130, before this receiver is connected to the line system 106, must be connected to the output on the decoder 131, as shown in Fig. 3. This connection can e.g. is achieved by soldering an electrical wire or by disconnecting all connections not required for the corresponding coding, · if all connections have been established previously. It is particularly convenient to provide this connection by means of plug-in bridges or by means of a switch, so that the receiver 111 can, if necessary, be reprogrammed without further ado to any other switch 123. It is also possible by means of a switch 123 to control several receivers 111 connected at different places in the line system 106 at the same time, whereby in the case of several receivers 111 the decoder 131 is set in a corresponding manner. If a particular receiver 111 were to respond to the operation of several switches 123, only corresponding connections need to be established in the decoder 131, for which purpose a disconnection gate (not shown) must be connected after the output of the decoder 131.

The consumer 122 connected after the coincidence step 135 can; for example consist of a combination of a stable element »eg, a switch, timer or amplifier, and a device subsequently connected via the supply line 114, which can be a motor ~ for operation ay windshield wipers, sunroofs, lifting devices for door windows and the like or signal transmitters such as lamps, horn or the like or measuring and control devices e.g. for tank filling, oil pressure or cooling water temperature in the motor vehicle. For answering ay the information determined by measuring or control devices, a response signal transmitter 149 is required, which transmits this information regarding e.g. operation or operational readiness at a consumer to, line 145 in the line system 106. To ensure that this respons-. only one indicator 146 in FIG. 2, which is coordinated with j the currently operated switch 123, is present in each.

receiver 111 between line 145 and sensor 149 a response signal latch 146, such as may simply be an AND gate, the sensor 149;

can e.g. be a light-sensitive element such as a photocell or photo-transistor, which when illuminated emits an output signal and thus via conduction; gene 145 controls the indicator 148 coordinated with this receiver 111 in the transmitter 110 in Fig. 2, where e.g. gencm ignition of. a control lamp;

indicates that a light controlled in the coordinated consumer 122 is lit.ί

The above-mentioned adjusting element in the consumer 122 preferably has an i

7600940-6 Disable delay of the order of the duration of a selection control period, so that the consumer 122 when operating the coordinated switch 123 remains operated during the period of a complete selection control period and is then put out of operation, only when this switch 123 would no longer be operated at the next achievement. the counting state coordinated with the switch 123 in question in the counting connection 115.

When the control system according to the invention is to control a large number of consumers 122 independently of each other, the counting switch 115 must be able to assume a corresponding number of counting states within each selection control period. However, this increases the cost of the counting connection of the embodiment described so far, in which each counting state is directly coordinated at a specific switch 123. According to a further development of the invention, the counter switch 115 is therefore constructed as a binary coded counter 124, after which a decoding matrix 125 controllable via the switches 123 is connected, as shown in Fig. 4, which for the sake of clarity is limited to only five count states. According to this embodiment, the switch-controlled matrix 125 on the transmitter side consists of a diode matrix, the operating line pairs of which via their adaptation stage 126 with a direct and an inverted signal output are connected to a binary state output on the counter 124. The logical connection between those controlled by the respective switches 123 on the one hand and the pair of operating lines on the other hand is achieved in a manner known per se by means of diodes 141, 142, which when operating several switches 123 simultaneously provides disconnection of interference effects. In Fig. 4, the diode paths for the switching pulse no. 4 drawn, which pulse when operating the switch 123.4 is supplied to the control line 129 in the line system 106, while the other paths for other switching pulses are only indicated by means of circles for simplification of the figure. In Fig. 4, further, the signal states of the operational line pair are entered for the binary-coded fourth counter at the output of the binary-coded counter 124. As can be readily seen from the one shown in Figs. 4 shown diode matrix, is by actuation ring, of the switch 123.4 and at the time of reaching the fourth counting state within each selection control period all diodes 141 connected to the fourth control line are biased in the blocking direction by corresponding signal state on the operating line pair, so that via the closed switch 123.4 positive potential, ie the switching pulse no. 4 arises on the control line 129. ' Particular coupling technical savings are achieved by using a binary coded counter 124 with where 7600940-6₁₂ after decoding matrix 125 is connected as counting switch 115 in transmitter 110, thereby using the response signal comparator 144 in Fig. 2 taken up in the form of disconnecting diodes in the diode matrix in its entirety corresponds to the OR gate 119 in Fig. 2.

Fig. 5 shows a particularly suitable embodiment of a receiver 111 adapted to a transmitter 110 according to Fig. 4. As with the transmitter 110, the 4ia clock line 117 in connection with a control pulse also receives a receiver counter 130 in connection with a control pulse, which also in this case outputs binary coded arithmetic signals. After the counter 130, a demand gate 134 is connected in this case as a decoding connection 131 on the receiver side via adaptation step 133 with a direct and a binary output for each binary point. Its mode of operation corresponds to the mode of operation of the matrix 125 in the transmitter 110 according to Fig. 4. However, the decoder 131 may be built on simple_;method, namely by a combination of fixed wiring and OR gates, since different counting states of the counting switch 115 on the transmitter side no longer need to be sensed as at the transmitter 110 via optionally operable switches 123 but for each receiver 111 only a single , just for this receiver 111 characteristic counting states of the counter 130 within each election control period, ~ respectively, some determined counting states. In order to be able to economically manufacture the receivers 111 as universally useful components in mass production, it is expedient to carry out, in accordance with the ring shape of the decoder 131 of Fig. 3 initially neutrally coordinates the outputs of the matching steps 133 to the inputs of the gate 134. These connections are again established by means of possibly also switchable conductor bridges or line breaks to a certain counting state and thus to a certain switch 123 in the transmitter 110, before the receiver 111 is connected in parallel with further receivers 111 and with the transmitter 110 to the line system 106 at any place.

In Fig. 5, again, decoding of the switching pulse no. 4, ie a coordination with the switch 123.4. If the counter 130 in connection with the occurrence of a control pulse on the line 117 is binary coded up to the count state no. 4, and only then does a signal appear at the output of gate 134, i.e. at the output of deco-. 131 on the receiver side and thus at one of the two inputs on the coincidence stage 135. As already explained in connection with fig.

7600940-6

1-3, the coincidence condition is met, when in addition now the switch 123.4 in the transmitter 110 is operated, so that the switching pulse no. 4 is thus fed via the control line 129. Hereby the consumer 122 connected after the step 135 is operated, as explained in more detail with line ay fig. in Fig. 4, when a signal from the sensor 149 occurs. In the embodiment of a receiver 111 according to Fig. 5, the latch 146 is further provided with a third input, which is connected to the line 117 and ensures that a response pulse occurs only at the same time as the coordinated clock pulse. Before the next clock pulse occurs and thus the currently considered receiver 111.4 for the current selection control period is no longer to be controlled as a result of the counter 130's transition to the next counting state, the sewing pulse is thus interrupted. Due to the connection of a large number of gates one after the other, delays occur in practice, so that it is expedient to ensure accurate synchronism between the clock pulse, which produces a certain counting state at the output of the counting coupling 115, and a response pulse coordinated therewith thereby. that the output of a response pulse is interrupted already at the end of the associated clock pulse by means of the response signal block 146.

The response signal transmitter 149 can again be an arbitrarily controlled signal transmitter, which in the presence of a certain ambient condition emits a signal similar to a limit value transmitter and via the line 145 controls the coordinated indicator 148 in the transmitter 110. This in fig. 2 The indicator 148 shown may be a two-point switching indicating means such as an either switched on or off light source or a relay switch which, in the described control via the line 145, triggers additional functions in subsequent switches.

The operating switches 123 are mainly elements, intended to be operated by the driver of the motor vehicle for e.g. switching on or off signal transmitters, lighting or actuators and the like. However, at least some of the switches 123 arranged in the transmitter 110 can also be sensors which are not operated by the driver of the vehicle but are controlled according to an e.g. automatic program sequence by means of automatic devices existing in the vehicle for e.g. engine management and control to trigger specific functions and / or detect specific conditions at specific locations in the vehicle. When manually operating the switches 123, it is usually ensured automatically that, due to the high clock pulse frequency, not only switching but also key-operated

7600940-6 .

switch 123 remains closed for at least an entire selection control period, so that when the output signal from the clutch 115, which is coordinated with this switch 123, which is just to be operated, Sven is safely fed at least one switching pulse with this characteristic to the control line 129. control, e.g. via contactless sensor elements or by means of previously specified automatically running programs, however, this time relationship is not automatically ensured with regard to the length of an election control period. In such cases, it is expedient to build each switch 123 according to Fig. 6. In the embodiment shown, the switch 123 consists of a bistable rocker stage 153 with a AND gate 154 connected thereto, which as a result of a third, with the clock pulse generator 112 in fig. 2 connected input simultaneously takes over the task of the pulse-forming stage 128 in Fig. 2. By means of a manually or automatically triggered pulse for optional control of a certain receiver 111, the toggle stage 153 is set, so that the coincidence condition at gate 154 is prepared via this input. This second input is connected in the transmitter 110 to the count outputs on the coupling 115 according to Fig. 2, so that an output pulse is applied to the control line 129 via the OR gate 119 at^;achieving this counting state during the duration of the clock pulse. The toggle stage 153 can be automatically reset either at the beginning of the next election control period, since its reset input is connected to the override output of the counting stage 115, or by^ra reset pulse entered manually or from some other control connection.

The operating system according to the invention can be fast and functional. safely built using standard components known in digital technology.⁴and can be tested and repaired in the event of a fault in the transmitter 110 or in the receivers 111.;

7600940-6 '

- _........._ __j

Claims '' --- i