FI84115C - ALARMANORDNING FOER EN KODSTYRD ELEKTROMEKANISK MANOEVERANORDNING. - Google Patents

Description

84115

Alarm device for electromechanical control device controlled by a code

The present invention relates to electromechanical control devices, the operation of which is achieved by means of a code and which are intended to control an access control device, such as a lock with an electric counter or a door opening motor, so that access is possible only to authorized persons who know the code. In general, these electromechanical control devices comprise, on the one hand, a control unit arranged in the vicinity of the device to be controlled and comprising an electronic device which checks the code provided by the users and, if correct, gives a control signal for the device. control and / or monitor said access.

One of the unauthorized means of access is to supply an electric actuator directly from an external voltage source. This can be done in a relatively inconspicuous way, because just by making a hole in the device you can get to said actuator. It is therefore desirable to design an alarm device that can alert the monitoring station to a denied access attempt. Of course, the alarm should not be triggered during permitted access.

The present invention therefore relates to an electromechanical control device of the above-mentioned type, in which the electric operation of the device forbidden tensioning triggers the alarm to be given to the monitoring unit.

The electromechanical control device according to the invention should be noted in particular that the control unit comprises a voltage detecting means connected to the terminals of the electrical device and its output signal is sent to a logic circuit which performs an AND function and receives a signal from the which is transmitted to the control unit.

Said alarm signal is preferably stored in a memory included in the control unit and reset to zero by the monitoring unit. In this way, all attempts to access the actuator are expressed as an alarm, which can also be given to discourage access attempts that are prohibited at the controlled access level. Because this alarm is stored in memory, it will not be cleared when a permitted action command is subsequently issued, which may be given, for example, by an outgoing person using a direct non-coded action command.

The voltage detecting means preferably gives a signal at a constant level regardless of the voltage applied to it. Thanks to this arrangement, voltages that are clearly different from the normal supply voltage of the actuator can be expressed. This is important because people who try to force the door open may not feel the normal operating voltage of the actuator.

Said detecting means may, for example, form a light switch whose light output part is connected to the supply conductor of the actuator, and the line is supplied under a constant voltage and forms the output of the detector. Thus, a complete disconnection field is obtained between the voltage applied to the actuator and the output signal of the detector.

The connection of this alarm to the shock or detach detection alarm of the control unit is advantageous, and in this case the above-mentioned alarm signal and the shock alarm signal are sent to the OR logic circuit, which gives a general damage signal to the control unit.

Other features and advantages of the invention will become apparent from the following description of an embodiment of the invention and the accompanying drawings: Fig. 3 is a general diagram of a lock control unit with an electric counterpart according to the present invention, and Fig. 2 shows a practical embodiment of a voltage vent member.

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The invention will now be described as applied to the control of the opening of a lock with an electric counterpart, but it can be applied to all electromechanical control devices, such as a door control motor, for example.

Figure 1 shows a lock provided with an electric mating piece, comprising, for example, an input adapter circuit 1, comprising, for example, a keypad, an identification card, a reader or the like, by means of which a door opening code can be given; the output of the input adapter circuit is sent to the comparator 1, which receives the opening code stored in electronic form elsewhere in the memory 3. When the two codes correspond to each other, the comparison element gives an opening signal, which is stored in the memory 4 and sent to the electric towpiece 5.

According to the invention, a voltage detector 6 is implemented, which is connected in parallel to the supply conductors of the electrical device of the mating piece 5; the output signal of the detector 6 is combined with the signal of the absence of an open command given by the memory 4 and the inverting circuit 10 in the AND logic circuit 7, the output of which gives an alarm signal for the direct power supply of the electrical counterpart 5.

According to another feature of the invention, the control unit also comprises a detector 8 which detects shocks or detachments applied to the control unit and thus gives an alarm signal for shocks or detachments applied to the central unit. The input alarm signal provided by the AND logic port 7 and the shock or detachment alarm signal provided by the detector 8 are combined in the OR logic circuit 9, which outputs a general alarm signal for an attempted damage.

4 84115

An alarm signal for input, shock or detachment is preferably stored in memory 11 and then sent to a monitoring unit (not shown). The latter comprises resetting the memory 11 to zero via, for example, line 12.

Figure 2 shows a preferred embodiment of the voltage detecting member 6. Persons attempting a prohibited opening may not be familiar with the normal supply voltage of the electrical counterpart and may use very different voltages than the normal supply voltage.

So you need to be able to avoid voltage differences at the detector terminals, you. a detector with an output signal independent of the detected voltage shall be selected. This can be realized, for example, by using a light switch 13, i.e. a component, which on the other hand comprises a light-emitting part 14 and a light receiver 15, which are optically connected. The light-emitting part of the light switch 13 is connected to the terminals of the supply conductors of the electric mating piece 5 via a resistor 16 and a protective diode 17. The light receiving part, in turn, is supplied with a constant voltage through a resistor 18, and its second terminal is grounded. In this way, at logic 19, a logic signal is obtained at the terminal of the light receiver connected to the positive supply source, which is high in the absence of the voltage indicated by the light receiver 15 and at the lower level when the member 14 is supplied. that the absence of voltage is expressed as a high level.

Here, in the exemplary embodiment, the AND circuit 7 consists of an E-OR circuit 21 that receives signals corresponding to the signals given to the AND circuit 7, i.e., the second port of the N-OR circuit 21 receives a signal indicating the presence of an instruction, but inverted, i.e. the mark is at a high level in the absence of a normal gate opening mark. It will be appreciated that the invention provides an immediate alarm immediately upon connection of the first supply voltage applied to the electrical counterpart, regardless of the value of this voltage.

5 84115

The electric power supply to the actuator is usually obtained from the distribution network by means of a buffer battery; for example, when controlling a door in a residential building using a buffer coil, the door can be opened when the mains supply is interrupted. However, when the owner is away for a long time, a long-term break in the network may occur, which is longer than the duration of the battery installed as a buffer, in which case it would not be possible to open the door after a long break in the network.

According to the invention, an external radiator connection device is implemented at the level of the control unit, which is tuned, i. connects to the actuator only if there is an interruption in the network and the buffer is not working. With this arrangement, the user also has access to his home after a long-term interruption of the network, which has caused the buffer battery to malfunction. The buffer coil is preferably automatically deactivated before it reaches a discharge state which renders it unusable.

The above description is given by way of illustration and not by way of limitation, and changes or modifications may, of course, be made without departing from the scope of the present invention. As specifically indicated above, certain components may be replaced by others that perform the same function, such as in the case of the AND logic circuit 21, which replaces the AND logic circuit of FIG.

Claims (6)

An electromechanical operating device intended to control an access control device comprising, in part, a control unit located in the vicinity of the device to be controlled and comprising an electronic device (1-4) which verifies the code provided by the users and correctly fails. code provides a control signal to the electrical actuation device (5) of the apparatus, and partly a remote monitoring unit which permits to control and / or control the opening of the door, characterized in that the control unit comprises a voltage detector element (6, 13). , which is connected to the terminals of the electrical actuator (5) and in which the output is transmitted on a logic circuit which performs the AND function (7, 21) and which otherwise receives a signal representative of the absence of activation order, the output of said logic circuit (7, 21) constitutes an alarm signal transmitted to the monitoring unit. Device according to claim 1, characterized in that the alarm signal memorizes its memory (11) contained in the controller and reset by the monitoring unit. Device according to claim 1 or 2, characterized in that the voltage detector element (6, 13) gives a constant level signal independent of the voltage applied to the same. 4. Apparatus according to claim 3, characterized in that the voltage detector element is a photocoupler (13), the light transmitting part (14) of which is connected to the supply terminals of the electrical actuator (5) and where the light-receiver part (15) is measured by a constant voltage. Device according to any of claims 1-4, characterized in that the control unit comprises a logic OR circuit (9) receiving partly said alarm signal and partly a signal emitted by a shock detector (8), said logic OR circuit 9 84115 (9). ) sends a general tamper alarm signal to the monitoring unit. Device according to any one of claims 1-5, powered by the mains supply and a buffer battery, characterized in that the control unit comprises a connection device for an external battery relative to the electric actuating device (5), said connection device being operable only when the mains supply is broken and the buffer battery is out of service.