DD300787A7 - Circuit arrangement for securing lock rooms or installations - Google Patents

Abstract

Claim 1: Circuit arrangement for securing lock spaces or systems with an input device, for example an input keyboard, a memory for the coding, an evaluation device and a triggering device whose input is connected to the output of the evaluation device, characterized in that between the input device (1 ) and the evaluation device (20) an electronic computer (2; 7) is arranged, in whose memory the coding using the input keyboard (1) is stored, and in that the evaluation device (20) to a predetermined result of a given arithmetic operation the number stored as coding and the number entered for actuating the triggering device (6) via the same input keyboard (1) is programmed.

Description

For this 1 page drawings

The invention relates to a circuit arrangement for securing lock rooms or facilities, with the help of the opening

a closure chamber or a closure system is initiated when a dor coding of the circuit corresponding number is entered.

There are room protection devices are known in which in front of a room to be protected, hereinafter referred to as closure space,

a telephone number switch is attached, with the help of an electromechanical rotary selector is set in motion, similar to the dialing process on the phone. In response to entering the correct code number, the locker room opens. The

Coding is made in most cases on a housed in the locker unit, the one Contains memory in the form of a switch matrix whose circulation depends on the number of possible code numbers, while the Entering the code number for the opening of the closure space via a specially provided, outside the Closing space arranged telephone number switch is made. It is known to use relays or other mechanical contacts instead of electromechanical rotary dials

whose help, usually in the form of a self-holding circuit, an opening of the closure chamber is achieved.

It is also known, instead of the telephone number switch, a keyboard for entering the code to open the Closing room leads to use. The known room protection devices with telephone number switch or keyboard adhere to the common disadvantages,

that for the coding and checking the input for opening the shutter space number to match the

Code number two separate devices are required and thus a high technical complexity for their production

arises that further on the coding the code number in any form must be mechanically adjusted and thus can be read after an unauthorized intervention and that in such systems, the electromechanical

Rotary dials or relays cause noises from which the code number can be recognized. It also adheres to the known Room protection devices with Drnhwählern or relay the well-known Nachtnil the susceptibility of mechanical contacts. It is an object of the invention to improve the safety and reliability of room protection devices. The invention is based on the object boi a room protection device coding the device and the Eingebe the Code number to open the locker room or the system via a single input device to make sowi s to

prevent the code number from being recognized.

This mechanical contacts are avoided and the technical complexity compared to the prior art

be reduced.

According to the invention, this object, starting from a circuit arrangement for securing closure chambers or

• systems, which has an input device, a memory for the coding, an evaluation device and a triggering device connected thereto, achieved in that between the input device and the

Evaluation device, an electronic computer is arranged, in which a memory, the coding is stored and

whose function is used as a computer, a given arithmetic operation with one about the same

Input device number entered. The evaluation device is programmed so that only then

causes an opening command to the triggering device when the predetermined number of operations performed with the number entered for opening leads to a predetermined computer result.

Expediently, the input device and the key that triggers the calculation result are accessible Range while all other parts of the circuitry including the arithmetic operation probing key (s)

are arranged in the secured area.

A considerable reduction in the implementation effort results when the given calculation operation is the Division is selected and the number corresponding to the coding is used as a constant divisor and as given Conveniently, in this case the evaluation device consists of two inputs

the segment outputs of the result display of a computer circuit connected decoders, wherein the output of the one decoder and a first digit output of the computer circuit are connected via gates conjunctively and the output of the other decoder, the output of said gate and a digit output for the overflow character by another

Gates disjunk'iv are linked. The output of this other gate is provided by a time constant term which is a large charge

and has a small discharge time constant, with which an input of another gate immediately before

Tripping device connected. The other input of this gate is via a series circuit of two monostable Multivibrators connected to a control line of the result button. A reset input of the last of the two monostable multivibrators is driven by a bistable multivibrator,

on the input side is connected to a key collection line and to the control line of the result key.

The invention enables bine significant improvement of the protection of lock rooms or facilities at the same time Avoiding mechanical contacts and reducing the required backup effort. The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing pointer

Fig. 1: a schematic diagram with computer circuit Fig. 2: an embodiment with computer circuit.

The code number is entered as shown in FIG. 1 via the keyboard 1 in the computer circuit 2 as a constant divisor by the division key 3 is operated after Eingaoe the number sequence of the code number. The memory of the computer circuit 2 for the constant divisor takes over the function of a code memory whose content remains stored until a renewed actuation of the division key 3. After entering the number to open the shutter space on the same keyboard 1 and pressing the result key 4, the division of the number entered by the code number. If they match, the result is equal to one. The result is evaluated by the evaluation device 20, and in the presence of the result one follows the delivery of an opening command to the opening device 6. Thus, the Divistonstaste 3 takes over the coding of the system, while H ^: ife the result button 4, the opening of the shutter space in accordance Code number and entered 7ahl is caused. While the input keyboard 1 and the result key 4 are arranged in the accessible area I, all other parts of the circuit arrangement are in the secure area II. The arrangement according to FIG. 2 consists of an 8-digit 4-species computer circuit 7, to which the keyboard 1, the division key 3, the result key 4, the evaluation device 20 with the decoder 5; 16, which are connected to seven segment outputs SA to SG, a gate 8, a gate 9, a time constant element, consisting of a capacitor 12, a charging resistor 10 and a discharge diode 11, further comprising a gate 13, a triggering device 6, a Series connection of two monostable multivibrators 14; 15 and a bistable multivibrator 18. The input keyboard 1 and the result key 4 are arranged in the accessible area I, the actual circuit arrangement including the division key 3 is located in the secured area II.

After pressing the division key 3, the computer circuit 7 is prepared for division. To encode one uses the following entered via the keyboard 1 number sequence, which can be 8stellig in the embodiment, as a constant divisor. The completion of the input of the code number is done by pressing the result key 4. To open the shutter space must be entered via the keyboard 1 the same number as the code number and the result key 4 is pressed. In this case, a division of the last number entered by the code number, so that when the result of the number one is calculated by the computer circuit 7. This result is applied to the segment outputs SA to SG according to the 7-segment representation time division multiplexed during the time of Digitansteuerung the digit output D, on. When Digitansteuerung the outputs D ₂ to Dio, the segment outputs SA to SG are blanked, at Digitansteuerung the overflow character Dn give the segment outputs SA to SG a signal for a possibly existing overflow. At the output of decoder 5 a signal "logical 1" appears when the segment drive SA to SG corresponds to the number 1, and at the output of decoder 16 a signal "logical 1" appears at blanking of the segment outputs SA to SG. The digital controls are evaluated sequentially. For this gate 8 connects the output of decoder 5 with digit output D ₁ conjunctively, gate 9 the output of decoder 16 to the output of gate 8 and Digitansteuerung D ₁ , disjunctive. By linking the Digitansteuerung Dn in gate 9, a possible overflow signal is not evaluated. At the output of gate 9 is then a signal "Logical 1",

if the conditions blanking or control of the digit 1 in the case of digital control D ₁ or digital control Dn are fulfilled. About the charging resistor 10, the capacitor 12 is charged. Failure to comply with one of the three conditions, that is, if there is no match of code number and number entered for opening, the capacitor 12 is discharged in a short time via the Entiaoediode 11, whereby the voltage across the capacitor 12 corresponds to the signal "logic 0" When the result key 4 is actuated, a monostable multivibrator 14 is placed in its quasi-stable position via a damming line 21 and, after its dwell time, actuates the monostable multivibrator 15, the dwell time being maintained during its dwell time logic signal on the capacitor 12 is interrogated by gate 13. The output signal of gate 13 is the command to control the triggering device 6. The delayed control of the monostable multivibrator 15 by the monostable multivibrator 14 serves to avoid Fahlansteuerungen during the computing process This simultaneously extends the time to feasibility of a next arithmetic operation. In this way it is achieved that the attempt to open the triggering device 6 by trying out several input combinations takes a much longer period of time and the chances of success for an unauthorized opening are further reduced. A provision of the monstable multivibrator 15 via the reset line 17 by the connected to a key collection line 19 bistable multivibrator 18 which tilts back on actuation of the result key 4 in its initial position, upon actuation of the keyboard 1 prevents the delivery of a command through the gate 13 to the triggering device. 6 if after pressing the result key 4 during the dwell time of the monostable multivibrator 15, the result, ie the number 1, is entered.

Claims (4)

1. Circuit arrangement for securing closure chambers or systems with an input device, for example an input keyboard, a memory for the coding, an evaluation device and a triggering device whose input is connected to the output of the evaluation device, characterized in that between the input device (1) and the evaluation device (20) an electronic computer (2; 7) is arranged, in whose memory the coding with the aid of the input keyboard (1) is stored, and in that the evaluation device (20) to a predetermined result of a given arithmetic operation with the number stored as coding and the number entered for actuating the triggering device (6) via the same input keyboard (1) is programmed. 2. A circuit arrangement according to claim 1, characterized in that only the input keyboard (1) and a result triggering the result key (4) in an access area (I) in front of the closure chamber or the closure system are arranged, while the actual circuit arrangement in the secured Area (II) is located. 3. A circuit arrangement according to claim 1, characterized in that the predetermined arithmetic operation a division and that the coding corresponding number in the one memory of the computer circuit (7) is input as a constant divisor and that the predetermined result of the computer operation are equal to one. 4. The circuit arrangement according to claim 1, characterized in that the evaluation device (20) consists of two input side to segment outputs (SA to SG) of the Rechnerschaltkreistis (7) connected to decoders (5; 16) that the output of the decoder (5) and a Digit output (D ₁ ) by a gate (8) conjunctive and the output of the decoder (16), the output of the gate (8) and a digit output (11) by a gate (9) are disjunctively linked, that the output of the gate ( 9) via a time constant element consisting of a capacitor (12), a charging resistor (10) and a discharge diode (11) and provided with a relative to the discharge time constants large charging time constant to which an input of a gate (13) is connected, whose output is connected to the input of the tripping device (6), and in that the other input of the gate (13) is connected via a series connection of two monostable multivibrators (14, 15) to one of the result button (4). influenced control line (21) is in communication and that a bistable multivibrator (18) on the input side to the control line (21) and to a key collection line (19) is connected, set by the key collection line (19) output via a reset line (17) with a Resetting input of the monostable multivibrator (15) is connected.