CN106815904B

CN106815904B - Access control method and device, access control equipment and system

Info

Publication number: CN106815904B
Application number: CN201510867735.9A
Authority: CN
Inventors: 汪广; 姚文跃
Original assignee: Shenzhen Da Shi Internet Of Things Technology Co ltd
Current assignee: Shenzhen Da Shi Internet Of Things Technology Co ltd
Priority date: 2015-12-01
Filing date: 2015-12-01
Publication date: 2020-05-15
Anticipated expiration: 2035-12-01
Also published as: CN106815904A

Abstract

The invention discloses an access control method, which comprises the following steps: when the trigger input circuit receives a detection signal sent by the detection device, the main controller of the access control equipment controls the low-frequency circuit to send a low-frequency card searching signal, so that the access control card receiving the low-frequency card searching signal sends a high-frequency response signal according to the low-frequency card searching signal; acquiring the high-frequency response signal received by a high-frequency circuit, and determining whether the access card has the door opening permission for opening the access associated with the detection device according to the high-frequency response signal and preset access card information; and when the access control card has the door opening right for opening the access control associated with the detection device, controlling an output circuit to open the access control associated with the detection device. The invention also discloses an access control device, access control equipment and an access control system. The invention realizes dual radio frequency communication in the entrance guard control and enhances the safety and reliability of the entrance guard control.

Description

Access control method and device, access control equipment and system

Technical Field

The invention relates to the field of access control, in particular to an access control method and device, access control equipment and an access control system.

Background

With the enhancement of security awareness, the entrance guard equipment has been increasingly applied to various entrance and exit control places, such as banks, hotels, machine rooms, key rooms, offices, intelligent communities, factories and the like, as a device for managing the entrance and exit of personnel. The entrance guard equipment integrates the microcomputer automatic identification technology and modern safety management measures into a whole, relates to a plurality of technical fields of electronics, machinery, optics, computers, communication, biology and the like, and is an effective measure for realizing safety precaution management in important entrance and exit places. The access control equipment needs to accurately identify the access control card carried by the user and make control output of corresponding authority, however, the existing access control system judges whether the access control card has the authority in a single mode, and the safety and reliability of access control cannot be well guaranteed.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention provides an access control method, an access control device, access control equipment and an access control system, and aims to solve the problem that the existing access control equipment cannot well guarantee the safety and reliability of access control.

In order to achieve the above object, the present invention provides an access control method, including:

A. when the trigger input circuit receives a detection signal sent by the detection device, the main controller of the access control equipment controls the low-frequency circuit to send a low-frequency card searching signal, so that the access control card receiving the low-frequency card searching signal sends a high-frequency response signal according to the low-frequency card searching signal;

B. acquiring the high-frequency response signal received by a high-frequency circuit, and determining whether the access card has the door opening permission for opening the access associated with the detection device according to the high-frequency response signal and preset access card information;

C. and when the access control card has the door opening right for opening the access control associated with the detection device, controlling an output circuit to open the access control associated with the detection device.

Preferably, the step a includes:

when receiving a trigger notification message, the main controller acquires a preset card type which can be identified by the access control equipment, and encrypts card searching information containing the card type, wherein the trigger notification message is sent to the main controller by the trigger input circuit when receiving the detection signal;

the encrypted card searching information is transmitted out through the low-frequency circuit in the form of a low-frequency card searching signal so as to receive the access control card of the low-frequency card searching signal, the low-frequency card searching signal is decrypted firstly, then whether the access control card belongs to the access control equipment for control or not is determined according to the card type obtained after decryption, and a high-frequency response signal is transmitted when the access control card belongs to the access control equipment for control.

Preferably, the high-frequency response signal comprises a card number and authority information of the access control card; the step B comprises the following steps:

acquiring and decrypting the high-frequency response signal received by the high-frequency circuit to acquire the card number and the authority information of the access control card;

judging whether the access card has the door opening authority for opening the access associated with the detection device according to preset access card information and the obtained card number and authority information;

and in the obtained permission information, determining that the access control card has the door opening permission for opening the access control associated with the detection device when the permission determined by the card number and the physical identification of the access control is consistent and meets the door opening condition in the access control card information.

In order to achieve the above object, the present invention further provides an access control device, including:

the input module is used for receiving a detection signal sent by the detection device;

the main control module is used for controlling the low-frequency module to send out a low-frequency card searching signal when the input module receives the detection signal;

the low-frequency module is used for sending a low-frequency card searching signal so that the access control card receiving the low-frequency card searching signal sends a high-frequency response signal according to the low-frequency card searching signal;

a high frequency module for receiving the high frequency response signal;

the main control module is further configured to acquire the high-frequency response signal received by the high-frequency module, and determine whether the access card has an access right to open the access associated with the detection device according to the high-frequency response signal and preset access card information; when the access control card has an access control right for opening the access control associated with the detection device, controlling an output module to open the access control associated with the detection device;

and the output module is used for opening the entrance guard associated with the detection device.

Preferably, the input module includes:

a first receiving unit for receiving the detection signal;

the notification unit is used for sending a trigger notification message to the main control module when the detection signal is received;

the master control module comprises:

a second receiving unit, configured to receive the trigger notification message;

the encryption unit is used for acquiring a preset card type which can be identified by the access control equipment when the trigger notification message is received, and encrypting card searching information containing the card type;

the control unit is used for controlling the low-frequency module to transmit the encrypted card searching information out in the form of a low-frequency card searching signal so as to receive the access control card of the low-frequency card searching signal, firstly decrypting the low-frequency card searching signal, then determining whether the access control card is controlled by the access control device according to the card type obtained after decryption, and sending a high-frequency response signal when the access control card is controlled by the access control device.

Preferably, the high-frequency response signal comprises a card number and authority information of the access control card; the master control module further comprises:

the decryption unit is used for acquiring and decrypting the high-frequency response signal received by the high-frequency module so as to acquire the card number and the authority information of the access control card;

the judging unit is used for judging whether the access control card has the door opening authority for opening the access control associated with the detecting device according to preset access control card information and the obtained card number and authority information;

and the determining unit is used for determining the authority determined by the card number and the physical identification of the access control in the obtained authority information, and determining that the access control card has the door opening authority for opening the access control associated with the detection device when the authority determined by the card number and the physical identification of the access control is consistent and meets the door opening condition in the access control card information.

In order to achieve the above object, the present invention further provides an access control device, which includes any one of the above access control devices.

In addition, in order to achieve the above object, the present invention further provides an access control system, which includes a detection device, an access control device, and an access control card, wherein the access control device is the above access control device; the detection device is used for sending a detection signal to the access control equipment when detecting that a person approaches the access control equipment;

the access control equipment is used for sending out a low-frequency card searching signal when receiving the detection signal;

the access card is used for sending a high-frequency response signal according to the low-frequency card searching signal when receiving the low-frequency card searching signal;

the entrance guard equipment is also used for receiving the high-frequency response signal and determining whether the entrance guard card has the door opening permission for opening the entrance guard associated with the detection device according to the high-frequency response signal and preset entrance guard card information; and when the access control card has the door opening right for opening the access control associated with the detection device, opening the access control associated with the detection device.

Preferably, the access control device is further configured to:

when the detection signal is received, acquiring a preset card type which can be identified by the access control equipment, and encrypting card searching information containing the card type; transmitting the encrypted card searching information by a low-frequency card searching signal;

the entrance guard card is further used for decrypting the low-frequency card searching signal when receiving the low-frequency card searching signal, then determining whether the entrance guard card is returned to the entrance guard equipment for control according to the card type obtained after decryption, and sending a high-frequency response signal when the entrance guard card is returned to the entrance guard equipment for control.

Preferably, the high-frequency response signal comprises a card number and authority information of the access control card; entrance guard's equipment still is used for:

receiving and decrypting the high-frequency response signal to obtain the card number and the authority information of the access control card;

According to the access control method, the access control device, the access control equipment and the access control system, when the access card near the access control equipment is searched, a low-frequency communication mode is adopted, and when the access card responds to the access control equipment, a high-frequency communication mode is adopted, so that the safety and the reliability of access control are enhanced through double radio frequency communication.

Drawings

Fig. 1 is a schematic flow chart of a first embodiment of an access control method according to the present invention;

fig. 2 is a schematic view of a detailed flow of card searching of the access control device in the second embodiment of the access control method of the present invention;

fig. 3 is a schematic view illustrating a detailed flow of the access control device when determining the access card right in the third embodiment of the access control method according to the present invention;

FIG. 4 is a schematic functional block diagram of a first embodiment of an access control device according to the present invention;

fig. 5 is a schematic view of detailed functional modules of an input module and a main control module in a second embodiment of the access control device of the present invention;

fig. 6 is a schematic view of detailed functional modules of a main control module in a third embodiment of the access control device of the present invention;

fig. 7 is a schematic structural diagram of the access control system according to the first embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides an access control method, as shown in fig. 1, which shows a schematic flow diagram of a first embodiment of the access control method, and the method comprises the following steps:

s10, when the trigger input circuit receives the detection signal sent by the detection device, the main controller of the access control equipment controls the low-frequency circuit to send out a low-frequency card searching signal, so that the access control card receiving the low-frequency card searching signal sends out a high-frequency response signal according to the low-frequency card searching signal;

the entrance guard equipment comprises a main controller, a trigger input circuit, a low-frequency circuit, a high-frequency circuit and an output circuit, wherein a control system is installed on the main controller. The detection device can be any one of a capacitance sensor, a thermal sensor, a pressure sensor and an infrared sensor, and is generally arranged near the access control equipment and can communicate with the access control equipment (a card searching signal sent by the access control equipment can cover an area near the detection device communicating with the access control equipment). One entrance guard is correspondingly associated with one detection device, and the detection devices associated with different entrance guards can be different. The detection device is used for sending a detection signal for triggering the access control equipment to search the access control card nearby when people are detected nearby the access control equipment.

When the user is close to the entrance guard or touches the detection device who sets up near entrance guard, trigger with entrance guard's detection device that associates is to the management and control the access control equipment's of entrance guard trigger input circuit sends the detected signal, access control equipment's main control unit is in trigger input circuit receives during the detected signal, control low frequency circuit sends the low frequency and seeks the card signal. And after receiving the low-frequency card searching signal, the access control card near the access control sends a high-frequency response signal according to the low-frequency card searching signal. Because entrance guard's equipment is through sending the low frequency and seeking the entrance guard's card in its vicinity of card signal, and then with entrance guard's card communication in order to confirm the access control card's the authority of opening the door realizes the control to entrance guard, and whole in-process, the user need not to hold the card and walks to entrance guard's equipment in the future, takes out the entrance guard card and places the region of punching the card at entrance guard's equipment, and only need carry the entrance guard card that the authority of opening the door can by oneself, saved the step of punching the card.

S20, acquiring the high-frequency response signal received by the high-frequency circuit, and determining whether the access card has the door opening permission for opening the access associated with the detection device according to the high-frequency response signal and preset access card information;

the high-frequency circuit of the entrance guard equipment receives the high-frequency response signal sent by the entrance guard card, the main controller acquires the high-frequency response signal and determines whether the entrance guard card has the authority to open the entrance guard associated with the detection device or not according to the high-frequency response signal and preset entrance guard card information, and corresponding entrance guard authority signal output is given. The access control card information comprises card numbers of access control cards which can be controlled by the access control equipment, physical identification of the access control associated with the detection device, and authority information of the access control cards with different card numbers under the access control with different physical identifications; the card number of one access control card can uniquely identify one access control card; the main controller determines the physical identification of the entrance guard associated with the detection device through a communication path between the entrance guard equipment and the detection device; the permission information comprises whether an access control card can be used for opening an access control corresponding to a certain physical identification and opening conditions which need to be met during access control, and the conditions can be defined that the access control card can only open an appointed access control within a specified time period.

And S30, when the access control card has the door opening right for opening the access control associated with the detection device, controlling an output circuit to open the access control associated with the detection device.

When the main controller of the access control equipment determines that the access control card has the door opening authority for opening the access control associated with the detection device, the main controller of the access control equipment sends a door opening instruction to an output circuit of the access control equipment so as to open the access control associated with the detection device through the output circuit; when the access control card is determined not to have the door opening authority, the main controller cannot send a door opening instruction to the output circuit, and at the moment, an alarm instruction can be sent to the output circuit by the main controller to prompt a user to open the access control associated with the detection device without the authority.

The main control unit can manage and control one or more entrance guards when main control unit only manages and controls an entrance guard, entrance guard's equipment includes the first entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit and the second entity structure that constitutes by an output circuit, or entrance guard's equipment is the third entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit, an output circuit.

When the master controller manages and controls a plurality of door controls, the door control equipment comprises a fourth entity structure formed by one master controller, a plurality of fifth entity structures formed by one trigger input circuit, one low-frequency circuit and one high-frequency circuit, and a plurality of sixth entity structures formed by one output circuit, wherein one door control corresponds to one fifth entity structure and one sixth entity structure; or, the entrance guard equipment comprises a fourth entity structure formed by a main controller, and a plurality of seventh entity structures formed by a trigger input circuit, a low-frequency circuit, a high-frequency circuit and an output circuit, wherein one entrance guard corresponds to one of the seventh entity structures. The main controller of the access control equipment can process the communication paths corresponding to the various accesses in parallel.

It can be understood that the main controller of the access control device can also control the high-frequency circuit to send a high-frequency card searching signal to the access control card near the access control when the trigger input circuit receives the detection signal, so that the access control card receiving the high-frequency card searching signal sends a low-frequency response signal, and the low-frequency circuit of the access control device receives the low-frequency response signal, so that the main controller performs subsequent judgment permission according to the low-frequency response signal, and controls the output circuit to open the access control.

According to the access control method provided by the invention, the low-frequency communication mode is adopted when the access control equipment searches the access cards nearby the access control equipment, and the high-frequency communication mode is adopted when the access control cards respond to the access control equipment, so that the safety and reliability of access control are enhanced through double radio frequency communication.

Further, referring to fig. 2, a second embodiment of the access control method according to the present invention is provided based on the first embodiment, in this embodiment, the step S10 includes:

s11, when receiving the trigger notification message, the main controller acquires a preset card type which can be identified by the access control equipment, and encrypts card searching information containing the card type;

and the trigger notification message is sent to the main controller by the trigger input circuit when the trigger input circuit receives the detection signal. The main controller is stored with information such as card types of the entrance guard cards which can be controlled by the entrance guard equipment. If the card type that an entrance guard card belongs to with the card type that main control unit goes up the storage all inequality, then the entrance guard card can not open arbitrary one entrance guard of entrance guard's equipment management and control. The main controller can adopt any encryption mechanism to encrypt the card searching information, and correspondingly, an access control card controlled by the main controller is provided with a corresponding decryption mechanism.

And S12, transmitting the encrypted card searching information through the low-frequency circuit as a low-frequency card searching signal so as to receive the access control card of the low-frequency card searching signal, decrypting the low-frequency card searching signal, determining whether the access control card is controlled by the access control equipment according to the card type obtained after decryption, and transmitting a high-frequency response signal when the access control card is controlled by the access control equipment.

The entrance guard equipment is always in a low power consumption mode when not receiving the detection signal, and in the low power consumption mode, the entrance guard equipment consumes least energy, only supports receiving the detection signal sent by the detection device, and switches from the low power consumption mode to a normal working mode when receiving the detection signal. The access control card is always in a low power consumption mode when not receiving the low-frequency card searching signal, the energy consumption of the access control card is minimum in the low power consumption mode, only the low-frequency card searching signal sent by the access control equipment is received, and when the low-frequency card searching signal is received, the access control card is switched to a normal working mode from the low power consumption mode, namely, the access control card is activated.

The trigger input circuit of entrance guard's equipment is after receiving the detected signal that detection device sent, entrance guard's equipment switches to normal operating mode from the low-power consumption mode to activate the low frequency circuit, main control unit control the low frequency circuit sends the 125KHz low frequency that contains encrypted information and seeks the card signal, in order to search and awaken up near entrance guard's card of entrance guard's equipment. After a low-frequency circuit on an access card near the access control equipment receives the low-frequency card searching signal, the access card is activated, a microcontroller arranged on the access card decrypts the low-frequency card searching signal according to a preset decryption mechanism, a data field in the low-frequency card searching signal is verified after the decryption is successful, and after the verification is successful, a high-frequency circuit on the access card sends out a high-frequency response signal containing encrypted information at the frequency of 868-915 KHz. When no response of the access control card exists near the access control equipment, the main controller tries to control the low-frequency circuit of the access control equipment to send out a low-frequency card searching signal again, and tries for three times at most, if the high-frequency circuit of the access control equipment does not receive a response signal sent by the access control card for three times, the access control equipment enters a low-power consumption mode again; if a high-frequency response signal sent by the access card is received once during the high-frequency circuit of the access control equipment, the main controller carries out subsequent decryption and determines the operation of the door opening permission according to the high-frequency response signal.

When an A encryption mechanism is arranged on one access control device, a corresponding A decryption mechanism is arranged on an access control card which can be controlled by the access control device; and when the access control card is provided with a B encryption mechanism, the access control equipment is provided with a corresponding B decryption mechanism. Wherein, the encryption mechanism A can be the same as or different from the encryption mechanism B.

According to the access control method provided by the invention, when the access control equipment or the access card does not receive any signal, the access control equipment or the access card is in the low-power-consumption working mode, when the signal is received, the access control equipment or the access card is switched to the normal working mode from the low-power-consumption mode, and subsequent operation is carried out, so that the energy consumption of the access control equipment or the access card in idle time is reduced, and when the access control equipment sends a low-frequency card searching signal to the access card, data is firstly encrypted, and then the low-frequency card searching signal is transmitted out, so that the safety and reliability of communication between the access control equipment and the.

Further, referring to fig. 3, a third embodiment of the access control method according to the present invention is provided based on the second embodiment, in this embodiment, the high frequency response signal includes a card number and authority information of an access card; the step S20 includes:

s21, acquiring and decrypting the high-frequency response signal received by the high-frequency circuit to acquire the card number and the authority information of the access control card;

after a high-frequency circuit of the access control equipment receives a high-frequency response signal sent by an access control card, a main controller of the access control equipment acquires the high-frequency response signal, decrypts the high-frequency response signal according to a preset decryption mechanism, and acquires the card number and the authority information of the access control card after decryption is successful. The obtained permission information comprises physical identifications corresponding to the entrance guard which can be opened by the entrance guard card corresponding to the card number and conditions required to be met during entrance guard opening, and the conditions can be defined that the appointed entrance guard can be opened by the entrance guard card within a specified time period.

S22, judging whether the access card has the door opening authority for opening the access associated with the detection device according to the preset access card information and the obtained card number and authority information;

s23, in the obtained permission information, the permission determined by the card number and the physical identification of the entrance guard, and the permission determined by the card number and the physical identification of the entrance guard in the entrance guard card information are consistent and meet the opening condition, the entrance guard card is determined to have the opening permission for opening the entrance guard associated with the detection device.

And when the door opening right of the access control card is judged, the main controller determines the physical identification of the access control associated with the detection device according to the communication channel where the detection signal is located. When the card number of the access control card is obtained, the card number of the access control card is in the preset access control card information, the obtained authority information is determined by the physical identification, and the access control card is determined to have the door opening authority for opening the access control associated with the detection device when the authority determined by the card number and the physical identification is consistent and meets the door opening condition.

When the obtained card number of the access control card is not in the preset access control card information, the access control card has no authority to open the access control associated with the detection device; and when the obtained card number of the access control card exists in the preset access control card information, but the obtained authority information is inconsistent with the authority determined by the card number and the physical identification or the authority does not meet the door opening condition with the preset access control card information, the access control card does not have the authority to open the access control associated with the detection device. And after the entrance guard equipment opens the entrance guard or sends out an unauthorized alarm signal according to the authority of the entrance guard card, the entrance guard equipment enters a low power consumption mode again.

According to the access control method, a low-frequency activation, high-frequency communication and double encryption communication mode is adopted, when the card number of the access card and the authority information of the access card under the current access control are consistent with the authority information of the card number under the access control in the preset access control card information and meet the door opening condition, the access control card is determined to have the authority to open the access control, and compared with the mode that the access control can be opened only through card number matching, the safety of access control is enhanced.

The present invention also provides an access control device, as shown in fig. 4, which shows a schematic diagram of functional modules of a first embodiment of the access control device of the present invention, the device includes:

an input module 100, configured to receive a detection signal sent by a detection apparatus;

the main control module 200 is configured to control the low-frequency module to send a low-frequency card-searching signal when the input module 100 receives the detection signal;

the low-frequency module 300 is configured to send a low-frequency card-searching signal, so that the access card receiving the low-frequency card-searching signal sends a high-frequency response signal according to the low-frequency card-searching signal;

the detection device can be any one of a capacitance sensor, a thermal sensor, a pressure sensor and an infrared sensor, and is generally arranged near the entrance guard control device and can communicate with the entrance guard control device (a card searching signal sent by the entrance guard control device can cover the area near the detection device communicated with the entrance guard control device). One entrance guard is correspondingly associated with one detection device, and the detection devices associated with different entrance guards can be different. The detection device is used for sending a detection signal for triggering the access control device to search the access card nearby when a person is detected nearby the access control device.

When a user approaches the entrance guard or touches a detection device arranged near the entrance guard, the detection device associated with the entrance guard is triggered to send a detection signal to the trigger input circuit of the input module 100, and when the input module 100 receives the detection signal, the main controller in the main control module 200 controls the low-frequency circuit in the low-frequency module 300 to send a low-frequency card searching signal. And after receiving the low-frequency card searching signal, the access control card near the access control sends a high-frequency response signal according to the low-frequency card searching signal. Because entrance guard control device seeks its near entrance guard card through sending the low frequency and seeking the card signal, and then with entrance guard card communication in order to confirm the access guard card's the authority of opening the door realizes the control to entrance guard, and whole in-process, the user need not to hold the card and walks to entrance guard control device in the future, takes out the entrance guard card and places the region of punching the card at entrance guard control device, and only need carry the entrance guard card that the authority of opening the door can by oneself, saved the step of punching the card.

A high frequency module 400 for receiving the high frequency response signal;

the main control module 200 is further configured to obtain the high-frequency response signal received by the high-frequency module 400, and determine whether the access card has an access right to open the access associated with the detection apparatus according to the high-frequency response signal and preset access card information; when the access control card has an access control right for opening the access control associated with the detection device, controlling an output module to open the access control associated with the detection device;

the output module 500 is configured to open an access control associated with the detection device.

The high-frequency circuit of the high-frequency module 400 receives the high-frequency response signal sent by the access control card, the main controller in the main control module 200 acquires the high-frequency response signal, and determines whether the access control card has the authority to open the access control associated with the detection device according to the high-frequency response signal and preset access control card information, and outputs a corresponding access control authority signal. The access control card information comprises card numbers of access control cards which can be controlled by the access control device, physical identifications of the accesses associated with the detection device, and authority information of the access control cards with different card numbers under accesses with different physical identifications; the card number of one access control card can uniquely identify one access control card; the main controller determines the physical identification of the entrance guard associated with the detection device through a communication channel between the entrance guard control device and the detection device; the permission information comprises whether an access control card can be used for opening an access control corresponding to a certain physical identification and opening conditions which need to be met during access control, and the conditions can be defined that the access control card can only open an appointed access control within a specified time period.

When determining that the access card has the access right to open the access associated with the detection device, the main controller in the main control module 200 sends an access instruction to the output circuit in the output module 500, so as to open the access associated with the detection device through the output circuit; when the access control card is determined not to have the door opening authority, the main controller cannot send a door opening instruction to the output circuit, and at the moment, an alarm instruction can be sent to the output circuit by the main controller to prompt a user to open the access control associated with the detection device without the authority.

The main control unit in the main control module 200 can manage and control one or more gate inhibition when the main control unit only manages and controls one gate inhibition, the gate inhibition control device comprises a first entity structure composed of one main control unit, one trigger input circuit, one low frequency circuit and one high frequency circuit, and a second entity structure composed of one output circuit, or the gate inhibition control device is a third entity structure composed of one main control unit, one trigger input circuit, one low frequency circuit, one high frequency circuit and one output circuit.

When the master controller manages and controls a plurality of gate controls, the gate control device comprises a fourth entity structure formed by one master controller, a plurality of fifth entity structures formed by one trigger input circuit, one low-frequency circuit and one high-frequency circuit, and a plurality of sixth entity structures formed by one output circuit, wherein one gate control corresponds to one fifth entity structure and one sixth entity structure; or, the entrance guard control device comprises a fourth entity structure formed by a main controller, and a plurality of seventh entity structures formed by a trigger input circuit, a low-frequency circuit, a high-frequency circuit and an output circuit, wherein one entrance guard corresponds to one of the seventh entity structures. The main controller of the access control device can process the communication channels corresponding to the various accesses in parallel.

It can be understood, among the entrance guard control device, host control module 200's main control unit also can be in when input module 100's trigger input circuit received the detection signal, control high frequency module 400's high frequency circuit sends the high frequency and seeks the card signal to near entrance guard's card, with by receiving high frequency seeks the entrance guard card of card signal and sends low frequency response signal, and by low frequency module 300's low frequency circuit receives low frequency response signal, so that main control unit basis low frequency response signal carries out subsequent judgement authority, and control output module 500's output circuit opens the operation of entrance guard.

The access control device provided by the invention adopts a low-frequency communication mode when searching for the access cards nearby, and adopts a high-frequency communication mode when the access cards respond to the access control device, so that the safety and reliability of access control are enhanced by double radio frequency communication.

Further, referring to fig. 5, a second embodiment of the access control device of the present invention is proposed based on the first embodiment, and based on the embodiment shown in fig. 4, the input module 100 includes:

a first receiving unit 101, configured to receive the detection signal;

a notification unit 102, configured to send a trigger notification message to the main control module 200 when receiving the detection signal;

the main control module 200 includes:

a second receiving unit 201, configured to receive the trigger notification message;

the encryption unit 202 is configured to, when receiving the trigger notification message, acquire a preset card type that can be identified by the access control device, and encrypt card-searching information including the card type;

when the first receiving unit 101 of the input module 100 receives the detection signal, the notification unit 102 sends the trigger notification message to the main controller of the main control module 200. The main controller is stored with information such as card types to which the access control cards that can be controlled by the access control device belong. If the card type that an entrance guard card belongs to with the card type that main control unit goes up the storage all inequality, then the entrance guard card can not open arbitrary one entrance guard of entrance guard control device management and control. The main controller can adopt any encryption mechanism to encrypt the card searching information, and correspondingly, an access control card controlled by the main controller is provided with a corresponding decryption mechanism.

The control unit 203 is configured to control the low-frequency module 300 to transmit the encrypted card searching information with a low-frequency card searching signal so as to receive the access card of the low-frequency card searching signal, decrypt the low-frequency card searching signal, determine whether the access card is controlled by the access control device according to the card type obtained after decryption, and send a high-frequency response signal when the access card is controlled by the access control device.

When the first receiving unit 101 does not receive the detection signal, the access control device is always in the low power consumption mode, and in the low power consumption mode, the access control device consumes the least energy and only supports receiving the detection signal sent by the detection device, and when the first receiving unit 101 receives the detection signal, the access control device is switched from the low power consumption mode to the normal working mode. The entrance guard card is always in a low power consumption mode when not receiving the low-frequency card searching signal, the entrance guard card consumes least energy in the low power consumption mode, only supports receiving the low-frequency card searching signal sent by the entrance guard control device, and switches from the low power consumption mode to a normal working mode when receiving the low-frequency card searching signal, namely, the entrance guard card is activated.

After the trigger input circuit of the input module 100 receives the detection signal sent by the detection device, the access control device is switched from the low power consumption mode to the normal working mode and activates the low-frequency circuit, and the main controller controls the low-frequency circuit to send a 125KHz low-frequency card searching signal containing encrypted information so as to search and wake up the access card near the access control device. After a low-frequency circuit on an access control card near the access control device receives the low-frequency card searching signal, the access control card is activated, a microcontroller arranged on the access control card decrypts the low-frequency card searching signal according to a preset decryption mechanism, a data field in the low-frequency card searching signal is verified after decryption is successful, and after verification is successful, a high-frequency circuit on the access control card sends out a high-frequency response signal containing encrypted information at the frequency of 868-915 KHz. When no response of the access control card exists near the access control device, the main controller tries to control the low-frequency circuit of the access control device to send out a low-frequency card searching signal again, and tries for three times at most, if the high-frequency circuit of the access control device does not receive a response signal sent by the access control card for three times, the access control device enters a low-power consumption mode again; if a high-frequency response signal sent by the access card is received once during the high-frequency circuit of the access control device, the main controller carries out subsequent decryption and determines the operation of the door opening permission according to the high-frequency response signal.

When an A encryption mechanism is arranged on one access control device, a corresponding A decryption mechanism is arranged on an access card which can be controlled by the access control device; and when the access control card is provided with a B encryption mechanism, the access control device is provided with a corresponding B decryption mechanism. Wherein, the encryption mechanism A can be the same as or different from the encryption mechanism B.

The entrance guard control device provided by the invention is in the low-power-consumption working mode when the entrance guard control device or the entrance guard card does not receive any signal, is switched to the normal working mode from the low-power-consumption mode when receiving the signal, and performs subsequent operation, so that the energy consumption of the entrance guard control device or the entrance guard card in idle time is reduced, and when the entrance guard control device sends a low-frequency card searching signal to the entrance guard card, data is firstly encrypted and then the low-frequency card searching signal is transmitted out, so that the safety and reliability of communication between the entrance guard control device and the entrance guard card are enhanced.

Further, referring to fig. 6, a third embodiment of the access control device of the present invention is provided based on the second embodiment, in this embodiment, the high frequency response signal includes a card number and authority information of an access card; based on the embodiment shown in fig. 5, the main control module 200 further includes:

the decryption unit 204 is configured to obtain and decrypt the high-frequency response signal received by the high-frequency module 400 to obtain the card number and the authority information of the access card;

after the high-frequency circuit of the high-frequency module 400 receives a high-frequency response signal sent by the access card, the main controller of the main control module 200 acquires the high-frequency response signal, the control unit 203 of the main control module 200 decrypts the high-frequency response signal according to a preset decryption mechanism, and after decryption is successful, the card number and the authority information of the access card are obtained. The obtained permission information comprises physical identifications corresponding to the entrance guard which can be opened by the entrance guard card corresponding to the card number and conditions required to be met during entrance guard opening, and the conditions can be defined that the appointed entrance guard can be opened by the entrance guard card within a specified time period.

A determining unit 205, configured to determine whether the access card has an access right to open the access associated with the detection apparatus according to preset access card information and the obtained card number and right information;

the determining unit 206 is configured to determine, in the obtained permission information, that the permission determined by the card number and the physical identifier of the access control is consistent with the permission determined by the card number and the physical identifier of the access control in the access control information and the permission determined by the physical identifier of the access control is consistent with the permission determined by the physical identifier of the access control, and when the permission determined by the physical identifier of the access control is satisfied with the door opening condition, that the access control card has the door opening permission to open the access control associated with.

When the judging unit 205 judges the door opening right of the door access card, the determining unit 206 determines the physical identifier of the door access associated with the detecting device according to the communication channel where the detecting signal is located. When the card number of the access control card is obtained, the card number of the access control card is in the preset access control card information, the obtained authority information is determined by the physical identification, and the access control card is determined to have the door opening authority for opening the access control associated with the detection device when the authority determined by the card number and the physical identification is consistent and meets the door opening condition.

When the obtained card number of the access control card is not in the preset access control card information, the access control card has no authority to open the access control associated with the detection device; and when the obtained card number of the access control card exists in the preset access control card information, but the obtained authority information is inconsistent with the authority determined by the card number and the physical identification or the authority does not meet the door opening condition with the preset access control card information, the access control card does not have the authority to open the access control associated with the detection device. And after the entrance guard control device opens the entrance guard or sends out an unauthorized alarm signal according to the authority of the entrance guard card, the entrance guard control device enters a low power consumption mode again.

The entrance guard control device provided by the invention adopts a communication mode of low-frequency activation, high-frequency communication and double encryption, and when the card number of an entrance guard card and the authority information of the entrance guard card under the current entrance guard are consistent with the authority information of the card number under the entrance guard in the preset entrance guard card information and meet the door opening condition, the entrance guard card is determined to have the authority to open the entrance guard, and compared with the mode that the entrance guard can be opened only through the card number matching, the safety of entrance guard control is enhanced.

The invention also provides access control equipment, which comprises the access control device in any embodiment.

Among the entrance guard control device, one or more entrance guards can be managed and controlled to host control module 200's main control unit when only managing and controlling an entrance guard, entrance guard control device includes the first entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit and the second entity structure that constitutes by an output circuit, or entrance guard control device is the third entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit, an output circuit.

The entrance guard equipment provided by the invention adopts a communication mode of low-frequency activation, high-frequency communication and double encryption, so that the safety and reliability of entrance guard control are enhanced.

The present invention further provides an access control system, as shown in fig. 7, which shows a schematic structural diagram of a first embodiment of the access control system of the present invention, in this embodiment, the access control system includes a detection device 10, an access control device 20, and an access control card 30, where the access control device 20 is the access control device described in any of the above embodiments; the detection device 10 is configured to send a detection signal to the access control device 20 when detecting that a person approaches the access control device 20;

the access control device 20 is configured to send a low-frequency card-searching signal when receiving the detection signal;

the access card 30 is configured to send a high-frequency response signal according to the low-frequency card searching signal when receiving the low-frequency card searching signal;

the access control device 20 is further configured to receive the high-frequency response signal, and determine whether the access control card 30 has an access control permission to open the access control associated with the detection apparatus 10 according to the high-frequency response signal and preset access control card information; when the access card 30 has an access right to open the access associated with the detection apparatus 10, the access associated with the detection apparatus 10 is opened.

Entrance guard's equipment 20 includes main control unit, triggers input circuit, low frequency circuit, high frequency circuit, output circuit, the last control system that installs of main control unit. The detecting device 10 may be any one of a capacitance sensor, a thermal sensor, a pressure sensor, and an infrared sensor, and is generally disposed near the access control device 20 and capable of communicating with the access control device 20 (a card seeking signal sent by the access control device 20 can cover an area near the detecting device 10 that is in communication with the access control device 20). One entrance guard is correspondingly associated with one detection device 10, and the detection devices 10 associated with different entrance guards can be different. The detection device 10 is configured to send a detection signal to the access control device 20 to trigger the access control device 20 to search for an access card 30 near the access control device 20 when detecting that there is a person near the access control device 20.

When the user is close to the entrance guard or touches detection device 10 that sets up near entrance guard, trigger with entrance guard's detection device 10 that is correlated with is to the management and control entrance guard's access control equipment 20's the trigger input circuit sends detection signal, access control equipment 20's main control unit is in trigger input circuit receives during detection signal, control low frequency circuit sends the low frequency and seeks the card signal. And after receiving the low-frequency card searching signal, the access control card 30 near the access control sends out a high-frequency response signal according to the low-frequency card searching signal. Because entrance guard's equipment 20 searches its near entrance guard card 30 through sending the low frequency and looking for the card signal, and then with entrance guard's card 30 communication in order to confirm entrance guard's the permission of opening the door of card 30 realizes the control to entrance guard, and in the whole process, the user need not to hold the card and walks to entrance guard's equipment 20 in the same place, takes out entrance guard's card 30 and places the region of punching the card at entrance guard's equipment 20, and only need carry the entrance guard's card 30 of the permission of opening the door in person can, saved the step of punching the card.

The high-frequency circuit of the access control device 20 receives the high-frequency response signal sent by the access control card 30, the main controller obtains the high-frequency response signal, and determines whether the access control card 30 has the authority to open the access control associated with the detection device 10 according to the high-frequency response signal and preset access control card information, and outputs a corresponding access control authority signal. The access control card information includes a card number of an access control card 30 that can be controlled by the access control device 20, a physical identifier of an access control associated with the detection apparatus 10, and authority information of access control cards 30 with different card numbers under access control with different physical identifiers; the card number of one access control card 30 can uniquely identify one access control card 30; the main controller determines the physical identification of the entrance guard associated with the detection device 10 through a communication path between the entrance guard equipment 20 and the detection device 10; the permission information includes whether one access control card 30 can be used for opening the access control corresponding to a certain physical identification and opening the condition that needs to be satisfied during the access control, the condition can be that the specified access control can be opened only within a specified time period for limiting the access control card 30.

When it is determined that the access card 30 has the access right to open the access associated with the detection apparatus 10, the main controller of the access control device 20 sends an access command to the output circuit of the access control device 20, so as to open the access associated with the detection apparatus 10 through the output circuit; when it is determined that the access control card 30 does not have the door opening right, the main controller does not send a door opening instruction to the output circuit, and at this time, the user is prompted to open the access control associated with the detection device 10 without the right by sending an alarm instruction to the output circuit.

The main control unit can manage and control one or more entrance guards when main control unit only manages and controls an entrance guard, entrance guard's equipment 20 includes the first entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit and the second entity structure that constitutes by an output circuit, or entrance guard's equipment 20 is the third entity structure that constitutes by a main control unit, a trigger input circuit, a low frequency circuit, a high frequency circuit, an output circuit.

When the master controller manages a plurality of gates, the gate control device 20 includes a fourth physical structure formed by one master controller, a plurality of fifth physical structures formed by one trigger input circuit, one low frequency circuit and one high frequency circuit, and a plurality of sixth physical structures formed by one output circuit, wherein one gate corresponds to one of the fifth physical structures and one of the sixth physical structures; or, the access control device 20 includes a fourth entity structure formed by a master controller, and a plurality of seventh entity structures formed by a trigger input circuit, a low frequency circuit, a high frequency circuit, and an output circuit, where one access control corresponds to one of the seventh entity structures. The main controller of the access control device 20 can process the communication paths corresponding to the respective accesses in parallel.

It can be understood that, the main controller of the access control device 20 can also control the high frequency circuit to send a high frequency card searching signal to the access control card 30 near the access control when the trigger input circuit receives the detection signal, so as to be received by the access control card 30 receiving the high frequency card searching signal sends a low frequency response signal, and is received by the low frequency circuit of the access control device 20, so that the main controller performs subsequent judgment authority according to the low frequency response signal, and controls the output circuit to open the access control.

According to the access control system provided by the invention, the access control equipment 20 adopts a low-frequency communication mode when searching for the access control card 30 nearby, and adopts a high-frequency communication mode when the access control card 30 responds to the access control equipment 20, so that the safety and reliability of access control are enhanced by double radio frequency communication.

Further, a second embodiment of the access control system according to the present invention is provided based on the first embodiment, in this embodiment, the access control device 20 is further configured to:

when the detection signal is received, acquiring a preset card type which can be identified by the access control device 20, and encrypting card searching information containing the card type; transmitting the encrypted card searching information by a low-frequency card searching signal;

the access control card 30 is further configured to decrypt the low-frequency card searching signal when receiving the low-frequency card searching signal, determine whether the access control card 30 is returned to the access control device 20 according to the card type obtained after decryption, and send a high-frequency response signal when the access control card 30 is returned to the access control device 20.

And the trigger notification message is sent to the main controller by the trigger input circuit when the trigger input circuit receives the detection signal. The main controller stores information such as a card type to which the access control card 30 that the access control device 20 can manage belongs. If the card type that an entrance guard card 30 belongs to with the card type that main control unit goes up the storage all inequality, then entrance guard card 30 can not open arbitrary one entrance guard of entrance guard's 20 management and control of entrance guard equipment. The main controller may employ any encryption mechanism to encrypt the card searching information, and accordingly, the access control card 30 managed and controlled by the main controller has a corresponding decryption mechanism.

The access control device 20 is always in the low power consumption mode when not receiving the detection signal, and in the low power consumption mode, the access control device 20 consumes the least energy, only supports receiving the detection signal sent by the detection device 10, and switches from the low power consumption mode to the normal operation mode when receiving the detection signal. The access card 30 is always in the low power consumption mode when not receiving the low frequency card searching signal, and in the low power consumption mode, the access card 30 consumes the least energy, only supports receiving the low frequency card searching signal sent by the access device 20, and switches from the low power consumption mode to the normal operation mode when receiving the low frequency card searching signal, that is, the access card 30 is activated.

After the trigger input circuit of entrance guard equipment 20 receives the detection signal that detection device 10 sent, entrance guard equipment 20 switches to normal operating mode from low-power consumption mode to activate the low frequency circuit, and main control unit control the low frequency circuit sends the 125KHz low frequency that contains encrypted information and seeks the card signal, in order to search and awaken up near entrance guard equipment 20's entrance guard card 30. After the low-frequency circuit on the access card 30 near the access control device 20 receives the low-frequency card searching signal, the access card 30 is activated, the microcontroller arranged on the access card 30 decrypts the low-frequency card searching signal according to a preset decryption mechanism, and verifies a data field in the low-frequency card searching signal after the decryption is successful, and after the verification is successful, the high-frequency circuit on the access card 30 sends out a high-frequency response signal containing encrypted information at the frequency of 868 plus 915 KHz. When no response is given to the access control card 30 in the vicinity of the access control device 20, the main controller tries to control the low-frequency circuit of the access control device 20 again to send a low-frequency card searching signal, and tries three times at most, and if the high-frequency circuit of the access control device 20 does not receive a response signal sent by the access control card 30 for three times, the access control device 20 reenters a low-power consumption mode; if a high-frequency response signal sent by the access card 30 is received once during the high-frequency circuit of the access control device 20, the main controller performs subsequent decryption and determines the operation of the access authority according to the high-frequency response signal.

When an encryption mechanism a is provided on one access control device 20, a corresponding decryption mechanism a is provided on an access control card 30 that can be managed and controlled by the access control device 20; when the B encryption mechanism is provided on the access card 30, the corresponding B decryption mechanism is provided on the access device 20. Wherein, the encryption mechanism A can be the same as or different from the encryption mechanism B.

According to the access control system provided by the invention, when the access control equipment 20 or the access control card 30 does not receive any signal, the access control equipment is in the low-power-consumption working mode, when the signal is received, the low-power-consumption mode is switched to the normal working mode, and subsequent operation is carried out, so that the energy consumption of the access control equipment 20 or the access control card 30 in idle time is reduced, and when the access control equipment 20 sends a low-frequency card searching signal to the access control card 30, data is firstly encrypted and then the low-frequency card searching signal is transmitted out, so that the safety and reliability of communication between the access control equipment 20 and the access control card 30 are enhanced.

Further, a third embodiment of the access control system according to the present invention is provided based on the second embodiment, and in this embodiment, the high-frequency response signal includes a card number and authority information of the access control card 30; entrance guard's equipment 20 is still used for:

receiving and decrypting the high-frequency response signal to obtain the card number and the authority information of the access control card 30;

after the high-frequency circuit of the access control device 20 receives the high-frequency response signal sent by the access control card 30, the main controller of the access control device 20 obtains the high-frequency response signal, decrypts the high-frequency response signal according to a preset decryption mechanism, and obtains the card number and the permission information of the access control card 30 after the decryption is successful. The obtained permission information comprises physical identifications corresponding to the entrance guards that the entrance guard card 30 corresponding to the card number can open and the conditions that need to be met during entrance guard opening, the conditions can be that the appointed entrance guard can be opened within a specified time period for limiting the entrance guard card 30.

Judging whether the access control card 30 has the door opening authority for opening the access control associated with the detection device 10 according to the preset access control card information and the obtained card number and authority information;

in the obtained permission information, the permission determined by the card number and the physical identification of the access control is consistent with the permission determined by the card number and the physical identification of the access control in the access control information and meets the condition of opening the door, and it is determined that the access control card 30 has the permission of opening the door of the access control associated with the detection device 10.

When the door opening right of the door access card 30 is judged, the main controller determines the physical identification of the door access associated with the detection device 10 according to the communication channel where the detection signal is located. When the card number of the access control card 30 is obtained, the card number is present in the preset access control card information, the obtained authority information is determined by the physical identification, and the access control card 30 is determined to have the door opening authority for opening the access control associated with the detection device 10 when the authority determined by the card number and the physical identification is consistent and meets the door opening condition.

When the obtained card number of the access control card 30 is not in the preset access control card information, the access control card 30 does not have the permission to open the access control associated with the detection device 10; when the obtained card number of the access control card 30 exists in the preset access control card information, but the obtained authority information is inconsistent with the authority determined by the card number and the physical identifier in the preset access control card information or the authority determined by the physical identifier does not meet the door opening condition, the access control card 30 does not have the authority to open the access control associated with the detection device 10. After the access control device 20 opens the access control or sends an unauthorized alarm signal according to the authority of the access control card 30, the access control device 20 reenters the low power consumption mode.

The access control system provided by the invention adopts a communication mode of low-frequency activation, high-frequency communication and double encryption, and when the card number of the access control card 30 and the authority information of the access control card 30 under the current access control are consistent with the authority information of the card number under the access control in the preset access control card information and meet the door opening condition, the access control card 30 is determined to have the authority to open the access control, and compared with the mode that the access control can be opened only through card number matching, the security of access control is enhanced.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An access control method is characterized by comprising the following steps:

A. when the trigger input circuit receives a detection signal sent by the detection device, the main controller of the access control equipment controls the low-frequency circuit to send a low-frequency card searching signal so that the access control card receiving the low-frequency card searching signal sends a high-frequency response signal according to the low-frequency card searching signal, wherein the low-frequency card searching signal comprises card type information which can be identified by the access control equipment and is subjected to encryption processing, and the main controller can control one or more accesses;

B. acquiring the high-frequency response signal received by a high-frequency circuit, and determining whether the access control card has the door opening permission for opening the access control associated with the detection device according to the decrypted high-frequency response signal and preset access control card information, wherein the access control card information comprises a card number of the access control card which can be controlled by the access control equipment, a physical identification of the access control associated with the detection device, permission information of the access control card with different card numbers under the access control with different physical identifications and conditions which need to be met when the access control is opened, and the conditions are that the access control card can open a specified access control within a specified time period;

2. The door access control method according to claim 1, wherein the step a comprises:

3. The door access control method according to claim 2, wherein the high frequency response signal includes a card number and authority information of the door access card; the step B comprises the following steps:

4. An access control device, comprising:

the main control module is used for controlling the low-frequency module to send out a low-frequency card searching signal when the input module receives the detection signal, wherein the low-frequency card searching signal comprises card type information which can be identified by the access control equipment and is encrypted, and the main controller can control one or more accesses;

a high frequency module for receiving the high frequency response signal;

the main control module is further configured to acquire the high-frequency response signal received by the high-frequency module, and determine whether the access card has an access right to open the access associated with the detection device according to the decrypted high-frequency response signal and preset access card information, where the access card information includes a card number of the access card that can be controlled by the access control device, a physical identifier of the access associated with the detection device, access right information of access cards with different card numbers under accesses with different physical identifiers, and a condition to be met when opening the access, where the condition is to limit that an access card can open a specific access within a specified time period; when the access control card has an access control right for opening the access control associated with the detection device, controlling an output module to open the access control associated with the detection device;

5. The access control device of claim 4, wherein the input module comprises:

a first receiving unit for receiving the detection signal;

the master control module comprises:

6. The door access control device of claim 5, wherein the high frequency response signal comprises a card number and authority information of the door access card; the master control module further comprises:

7. An access control device, characterized in that the access control device comprises an access control apparatus according to any one of claims 4-6.

8. An access control system, comprising a detection device, an access control device and an access control card, wherein the access control device is the access control device according to claim 7; the detection device is used for sending a detection signal to the access control equipment when detecting that a person approaches the access control equipment;

the access control equipment is used for sending a low-frequency card searching signal when receiving the detection signal, wherein the low-frequency card searching signal comprises card type information which can be identified by the access control equipment and is subjected to encryption processing, and the main controller can control one or more accesses;

the entrance guard equipment is further used for receiving the high-frequency response signal, and determining whether the entrance guard card has an opening authority for opening the entrance guard associated with the detection device according to the decrypted high-frequency response signal and preset entrance guard card information, wherein the entrance guard card information comprises a card number of the entrance guard card which can be controlled by the entrance guard equipment, a physical identifier of the entrance guard associated with the detection device, authority information of entrance guard cards with different card numbers under entrance guards with different physical identifiers, and conditions which need to be met when the entrance guard is opened, and the conditions are that the entrance guard card can be limited to open a specified entrance guard within a specified time period; and when the access control card has the door opening right for opening the access control associated with the detection device, opening the access control associated with the detection device.

9. The access control system of claim 8, wherein the access control device is further configured to:

10. The door access system of claim 9, wherein the high frequency response signal comprises a card number and authority information of the door access card; entrance guard's equipment still is used for: