RU2253898C2 - Controller for universal bank card access control system - Google Patents

Abstract

FIELD: access control systems, ATMs.

SUBSTANCE: controller has control signals generator, state analyzer, signals detector, executive device, state indicator.

EFFECT: simplified construction, higher efficiency.

3 dwg

Description

FIELD OF THE INVENTION

The invention relates to digital autonomous access control systems, in particular to room access control systems and ATM devices (ATMs), where client bank microprocessor cards and plastic cards with a magnetic strip can be used as an identifier key.

The implementation of this device is most optimal in cases where access to the autonomous closed client area of the ATM is differentiated between random persons and plastic card holders of card issuing banks of various payment systems.

The objective of the invention is the construction of a simple stand-alone device that controls the unauthorized entry into the secure premises by identifying the type of plastic card as a microprocessor bank card (asynchronous smart cards) or as a credit / debit plastic card with a magnetic strip.

State of the art

Due to the lack of analogues of this device to date, the task is solved by creating, through microchip technology, a multifunctional module - a controller that would issue enable / disable signals for executive devices by processing signals of standard functions and algorithms from plastic card readers.

SUMMARY OF THE INVENTION The list of drawings and other materials.

Information confirming the possibility of carrying out the invention

The controller is a universal module, in connection with which it can be connected to plastic card readers produced by a number of companies specializing in retail and banking equipment (OMRON, MAGTEC, ELK TECHNOLOGIES, TransMac, etc.).

As methods for identifying a plastic card as a bank card, the invention uses the results of the following algorithms:

a magnetic stripe plastic card is recognized due to

- the result of reading by the card reader the second track of the magnetic strip (ABA), better known as “financial” according to the norms of ISO 7813;

microprocessor bank card is recognized due to

- the result of processing the ATR burst signal (“response to reset” signal) read from the microprocessor card in accordance with the documented standard ISO 7816;

It should be noted that the notation and terminology set forth in the sections of the above standards will be used below.

Figure 1 presents the functional diagram of the controller. According to the invention, the controller exchanges signals with a card reader. The controller itself is presented from the following functional blocks:

- state analyzer;

- control signal generator;

- signal detector;

- executive device;

- status indicator.

The algorithm of the invention is as follows.

When a user installs a card in a reader, the latter, as a rule, gives a signal for the presence of the card and the resolution of the dialogue between the card and the controller. Such signals are standard for all types of plastic card readers. When this signal is detected by the “Status Analyzer” of the controller, a series of procedures are launched to determine the type of plastic card provided by the user. Let us dwell on each of the procedures.

When a plastic card is detected by the “Status Analyzer” in the card reader, a request is made for a coding detection signal for the second track of the magnetic strip and at the same time the “Control Signal Generator” of the controller gives the following signals:

- the supply voltage and “zero” are applied to the contacts of the ISO1 and ISO5 cards, respectively;

- the CLOCK pin (ISO3) receives a synchronization signal;

- a reset signal is sent to the RESET contact (ISO2);

Charts of these signals are shown in figure 2. Time periods T1; T2; T3; T4 is not strictly determined and may depend on the design of the card reader, on the nature of the data line. The only important thing is the signal delivery sequence, which is described in section 3 of the ISO 7816 standard. The need for strict observance of the synchronization frequency of 3.579545 MHz is also indicated there.

We turn further to the algorithm of the invention. When the “Signal Detector” detects the ATR burst signal controller (ANSWER TO RESET) on the input / output contact of the ISO7 card (in FIG. 2 it is designated as “RESPONSE”) - the invention provides signals to both the actuator and the audio (visual ) information. The ATR signal is peculiar only to asynchronous microprocessor cards, which are bank cards - unlike synchronous ones, which are used in telephony (telephone cards for pay phones). The recognition algorithm for this signal consists in detecting the pulse packet as a sequence of pulses arriving at a digital potentiometer, which in turn changes the threshold voltage of the comparator, which outputs a pass permission signal. The invention does not decode the ATR signal (a kind of “card signature”) due to the lack of need, which allows the invention to be implemented in a simple circuitry manner.

The signal of the encoding detection of the second track of the magnetic strip, mentioned above, similarly to the ATR signal also puts actuators in active mode. This signal is standard for all models of plastic card readers and is generated by the reader if there is a recording code on the second (financial) track, which is confirmation of the identification of the plastic card as a payment instrument (bank card).

The use of simplified identification algorithms in the invention is sufficient, because firstly, it allows you to transfer to the category of prohibited for passage telephone cards, travel cards that have a distribution that is comparable to the distribution of bank cards and have an equally wide circulation. Secondly, this allows the controller to be implemented without microprocessor circuitry, which would be necessary for decrypting card codes. These conditions ultimately affect the overall dimensions and the cost of manufacturing the invention.

Regarding the executive devices (devices), it should be noted that the control signal - in case of application of the invention in access restriction systems, various kinds of blocking devices are unlocked:

- electromechanical latches;

- electromagnetic locks;

- turnstiles (gateways).

Figure 3 presents the electrical schematic diagram of the controller, which is made on widely used in household and professional equipment element base.

“Signal Detector” is made on DS1804 microcircuits; MAX921 and 74ALSO3 (K555LAZ) (U3), as well as a group of elements 74ALSO5 (К555ЛН1).

The "control signal generator" is made on the SG-8002 chip and the group of elements of the 74ALSO5 (K555LN1) and 74ALSO3 (K555LAZ) microcircuit (U1).

A “state analyzer” is a U1: A element of a 74ALSO3 chip (K555LA3) and a U2: C element of a 74ALSO5 chip (K555LN1).

The “executive device” is built on the NE555 chip, a group of elements of the 74ALSO5 chip (K555LN1), and on the KT829A composite transistor.

The “Status Indicator” is a SIITRON XI piezoceramic generator operating in the audio range, as well as a standard LED card reader, controlled by the U2: D element of the 74ALSO5 chip (K555LN1).

This circuit is optimized for working with the HYBRID CARDREADER HERCULES 2000 reader manufactured by ELK TECHNOLOGIES (USA) (the controller input circuits are separated for the counterpart of the HERCULES 2000 reader model BP 10650) and tested on a group of objects of some financial institutions. The scheme is easily optimized for a number of models of other readers, which allows us to consider the universality of the invention not only in the context of the universality of card service, but also in the context of docking with a number of products of many companies specializing in retail and banking equipment.

Claims (1)

The controller of the universal access control system for rooms and ATM devices (ATMs), where client bank microprocessor cards and plastic cards with a magnetic strip are used as an identifier key, simultaneously processes both microprocessor cards and plastic cards with a magnetic strip, contains consisting of “Control Signal Generator”, “Status Analyzer”, “Signal Detector”, “Actuator”, “Status Indicator”, upon detection by the “Status Analyzer” the signal of the presence of the card in the reader, a request is immediately made for the signal for detecting the encoding of the second track of the magnetic strip of the card and at the same time the “Control signal generator” supplies the supply voltage and “zero” to the contacts of the card ISO1 and ISO5, respectively, to the CLOCK (ISO3) contact it sends a synchronization signal, and sends a reset signal to the RESET pin (ISO2), then when the “Signal Detector” detects the presence of the encoding detection signal of the second track of the magnetic strip of the card or burst signal on the I / O pin arts ISO7 "Signal Detection" outputs control signals to the "actuator" and "Status indication".

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