SU752399A1 - Device for identification of magnetic cards - Google Patents

Description

one

The invention relates to the field of signaling and control systems and can be used to identify users by means of identifying magnetic cards belonging to these users.

A device that identifies magnetic cards is known, which contains magnetic sensors, a software module, a multiplexer, a source of current pulses, a synchronization unit, a power supply unit, a counter, a decoder, a keyboard, a converter, a comparator .15

A disadvantage of the known device is that it does not control the number of uses of the magnetic card.

The closest in technical essence to the present invention is a device containing a group of sensors of the Gre code, a group of sensors of the identification code, latches, converters, a counter, electronic selector circuits, a reversible electromagnet, switches, a trigger, an O-flip-flop, a switching panel, comparator, non-zero detector, synchronizer, output control circuit, relay - 30

sensor circuit, display control circuit and associated communications 2.

The disadvantage of it is that there is no restriction in the device on the time of user interaction with the corresponding resources, which is the source of unauthorized use of the identification card.

The purpose of the invention is to increase reliability.

The goal is achieved by the fact that the device contains a first sensor connected in series, a counter, a detector, and a second sensor connected in series, a register, a comparison unit, the first input of which is connected to the register output, a memory block connected to the second input of the comparison unit, the element And, the first input of which is connected to the output of the comparison unit, and the second input - with the output of the detector, the first trigger, the first input of which is connected to the output of the element And, the prohibition element, the first input of which is connected to the first the first output of the first trigger, the output block, the first input of which is connected to the second output of the first trigger, the second input - with the output of the prohibition element, the display unit, the first input of which is connected to the input of the counter, the recording unit, the first input of which is connected to the output of the counter, the switch, whose input is connected to the zero potential bus, the second trigger, the first input of which is connected to the first output of the switch, the second input to the second output of the switch, the output to the second input of the display unit, the third input of the output block, syn generator, the first input of which is connected to the output of the prohibition element, the first output - with the inputs of the first and second sensors, the second output with the second input of the first trigger, the third output - with the second input of the prohibition element, the fourth output - with the BTOpfcOM counter input, the fifth output the second input of the recording unit, as well as the fourth input of the output block, additionally introduced the second element I, the first input of which is connected to the output of the second trigger output — to the second input of the sync generator, the delay element whose input is connected to the fifth output synchronizer, the third trigger the first input of which is connected to the output of the delay element, the second input of the synchronizer output, output to the second input of the second element AND, the element NOT whose input is connected to the output of the second element AND, the output to the third input of the clock generator. The block diagram of the device shown in the drawing. The device contains the first sensor 1, the counter 2, the recording unit 3, the display unit 4, the detector 5, the first element 6, the first trigger 7, the prohibition element 8, the clock 9, the output block 10, the second sensor 11, the register 12, the comparison block 13 , memory block 14, switch 15, second trigger 16, delay element 17, third trigger 18, second element 19, NOT 20 element, magnetic card 21. First sensor 1, counter 2 and detector 5 are connected in series. The second sensor 11, register 12 and comparison unit 13 are connected in series. The output of memory unit 14 is connected to the second input of equalizer unit 13. Output counter 2 connect. Also with the first inputs of the recording unit 3 and the display unit 4. The inputs of the first element 6 are connected to the outputs of the comparison unit 13 and the detector 5, and the output is connected to the first input of the first trigger 7. The first output of the first trigger 7 is connected to the first input of the inhibit element 8, the second output to the first input of the output block 10. The output of the element 8 prohibition is connected to the first input of the synchronizing generator 9 and the second input of the output unit 10. The inputs of the second trigger 16 are connected to the outputs of the switch 15, the input of which is connected to the zero potential bus. The output of the second trigger 16 is connected to the second input of the display unit 4, the third input of the output unit 10 and the first input of the second element AND 19. The second input of the element 19 is connected to the output of the third trigger 18, the first input of which is connected to the output element 17 of the delay. The output element And 19 is connected to the second input of the synchronizing generator 9 and through the element NOT 20 to the third input of the synchronizing generator 9. The first output of the synchronizing generator 9 is connected to the inputs of sensors 1 and 11, the second output - to the second input of the first trigger 7, the third output - to the second input of the element 8 prohibition, the fourth output - with the second input of counter 2, the fifth output - with the fourth input of the output unit 10, with the input of the delay element 17 g with the second input of the second trigger 18 and the second input of the recording unit 3. The sensors 1.11 are designed to read from the magnetic card 21, respectively, the operating time code and the identification code. The recording unit 3 is intended for recording on the magnetic card 21 of the operating time code. The detector 5 is designed to isolate a nonzero runtime code. The output unit 10 is intended to enable (or prohibit) the operation of the device that the user wants to access. A memory unit 14 is provided for storing a reference identification code. The delay element 17 is designed to set a time slice. The device works as follows. Entering the magnetic card 21 leads to the closure of the contacts of the switch 15 and the installation of the trigger 16 to 1. The trigger, the ger 18 is initially set to 1 when the power source is turned on. From the output of the element And 19 to the second input of the synchronous generator 9 receives a signal that triggers it. The clock generator 9 generates a sequence of pulses C1-C5. In addition, the signal from the output of the trigger 16 enables the operation of the display unit 4 and prepares the output unit 10. According to the signal C1 from the magnetic card 21, the sensor 1 reads into the counter 2 the operation time code T, and the sensor 11 reads into the register 12 an identification code. The contents of counter 4 are displayed in display unit 4. If the operation time code is nonzero, then the first input of element Ib receives a signal of a logical unit from the output of detector 5. When an identification code read from a magnetic card is identified with a code stored in memory block 14, comparison unit 13 outputs to the second input of the element And b is the signal of a logical unit. When a signal of a logical unit arrives from the output of the element Ib, the signal C2 at the second output of the trigger 7 sets the signal of the logical unit that is fed to the first input of the output unit 10. From the first output of the trigger 7 to the first input of the prohibition element 8 a logical zero signal is received. At the SZ signal, the prohibition element 8 does not work, and the synchronizer 9 does not stop. According to the signal C4, arriving at the second input of the counter 4, the operation time code is reduced by one. The signal C5, which enters the input of the recording unit 3, records a new operation code reduced by one for the magnetic card 21. The signal C5 also includes the output unit 10, and the user gets access to the required means. At the same time, the signal C5 is set to the zero state trigger} 18. The signal C5 is also fed to the element 17 of the delay. At the output of the element 19, the logical zero signal is set, and at the output of the element 20, the signal of the logical unit that prepares the clock generator 9 for a new cycle of operation. After a period of time b, determined by the delay element 17, the trigger 18 is set by 1 signal from the output of the delay element 17. And element 19 is triggered, and a signal is sent to the second input of the clock 9 that triggers it. Then everything will happen as described above. But if the time code of work becomes zero, then at the output of the element And 6 there will be a logical zero. Signal C2 establishes a logical unit at the first output of trigger 7, and by signal C3, the signal from the exit of prohibition element 8 stops the synchronous generator 9 and turns off output unit 10. If the read identification code does not compare with the stored code when entering the card, zero, then the SZ signal, the sync generator 9 stops, and the output unit 10 does not turn on. After removing the card 21, a logical zero is set at the output of the trigger 16, the clock generator 9 is reset, and the output unit 10 is turned off if it has been turned on. Thus, in the device, the total interaction time is determined by the expression:

f - F. 1 in your.

In device 1 on the magnetic card, only an identification code is contained.

therefore, the time of interaction of a person with the resources to which he has permission is unlimited.

The device 2 on the magnetic card contains an identification code and the number of allowed hits. Each time a magnetic card is identified, the number of allowed obrgheniyeny decreases by one. However, the interaction time of the person using this identification card is not limited in each treatment. Therefore, even with a small number of allowed hits, the total time of interaction of a person with resources is unlimited.

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In the proposed device, the time of interaction of the person using this identification card with the resources to which it requests access is limited by time.

0 work recorded in coded form on a magnetic card. Upon expiration of the work time indicated on the magnetic card, a person’s access to resources is prohibited.

five

Thus, the proposed device allows controlling the total shelf life of the magnetic card, which, in turn, increases the reliability of the device.

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Claims (2)

1. US patent number 3648021, cl. 295-61.7, publ. 04.01.69. 2. US patent number 3885130, CL 235-61.11, published. 07.07.70 (prototype)