CN108961481A - Access control system with testimony of a witness comparing function - Google Patents
Access control system with testimony of a witness comparing function Download PDFInfo
- Publication number
- CN108961481A CN108961481A CN201810013376.4A CN201810013376A CN108961481A CN 108961481 A CN108961481 A CN 108961481A CN 201810013376 A CN201810013376 A CN 201810013376A CN 108961481 A CN108961481 A CN 108961481A
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- Prior art keywords
- circuit
- card
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Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/22—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of access control systems with testimony of a witness comparing function, comprising: guest machine, the IC card suitable for being recorded to visitor's travel track；Guest machine includes: main control module, the memory module that is connected with the main control module, communication module；Main control module is connected with scanner；Main control module is also connected with identity card reading device: locating module, the microprocessor module being connected with the locating module；The access control system further includes sign-in machine, and the sign-in machine obtains the access data of visitor by Cloud Server；The sign-in machine, which is connected with, registers with IC card read-write equipment；The sign-in machine is located in each office, after visitor reaches purpose office, is written and read to IC card, to complete to register.
Description
Technical field
The invention belongs to access control systems, and in particular to a kind of access control system with testimony of a witness comparing function.
Background technique
That there are security breaches is more for traditional artificial visiting registration, operate dehumanization, service level is low, and lack of control is accurate
Data support the disadvantages of.
Summary of the invention
The object of the present invention is to provide a kind of access control systems with testimony of a witness comparing function, to realize the traveling rail to visitor
Mark is recorded.
In order to solve the above-mentioned technical problems, the present invention provides a kind of access control systems with testimony of a witness comparing function, comprising:
Guest machine, the IC card suitable for being recorded to visitor's travel track；Wherein the guest machine includes: main control module, with the master control
The connected memory module of module, communication module；The main control module is connected with scanner, to read, record the printing of identity card
Face information；The main control module is also connected with identity card reading device, with chip information in reading identity card；And the master control
Module is also connected with by an IC card read-write equipment, and visitor information is written in the IC card；It include: positioning mould in the IC card
Block, the microprocessor module being connected with the locating module, for prestoring the map datum in a region and visitor information being written
Memory module；After visitor information is written in memory module, locating module is carried out activation operation by the microprocessor module, with note
Record the travel track of visitor；And after access, the main control module is by IC card read-write equipment to the traveling rail of visitor
Mark is read out.
Further, the access control system further includes sign-in machine, and the sign-in machine obtains the access of visitor by Cloud Server
Data；The sign-in machine, which is connected with, registers with IC card read-write equipment；The sign-in machine is located in each office, when visitor reaches mesh
Office after, IC card is written and read, with complete register.
The main control module uses embedded J1900 industrial control mainboard；The scanner knows IDR-A3 papers-scanning using ancient cooking vessel
OCR identifier, the identity card reading device use application number: disclosed in 201410184166.3 there is identity card RFID to read
The reading device taken；The IC card read-write equipment uses Ming Hua Australia Chinese RF-EYE-U010-MEM non-contact reader-writer；It is described to deposit
It stores up module and uses SD storage card, the communication module is used with WiFi module etc..
Described register also is adopted with IC card read-write equipment using model same as aforementioned IC card read-write equipment and sign-in machine
With with the same embedded J1900 industrial control mainboard of guest machine；And it also is provided with Ethernet card in the sign-in machine, with realization and cloud
Server is communicated, and after the IC card to visitor is written and read and (registers), the data that will register are sent to Cloud Server, cloud service
Device will register data feedback to guest machine, show that the visitor has arrived at destination.
The identity card reading device includes: the power supply that anti-reverse battery protection circuit and chargeable storage are constituted；It is anti-
Reverse battery protection circuit includes: input terminal and the output end for connecting battery；It is connected between input terminal and output end
There is a control circuit, when accumulator positive connects, the control circuit is suitable for control input, output end conducting constitutes charge circuit,
And in reverse connection of accumulator, the cathode of cathode and output end that the control circuit is suitable for control signal is disconnected, with cutting
Charge circuit.
The control circuit includes: first switch circuit, by the second switch circuit of the first switch circuit control；It is located at
It connects between the cathode of input terminal and the cathode of output end a thyristor；When accumulator positive connects or is reversely connected, first switch circuit
Pass through second switch circuit control turn on thyristors or closing；The first switch circuit includes: PNP triode, the PNP tri-
The emitter of pole pipe connects the positive line of input, output end, and the base stage of the PNP triode connects a bleeder circuit, described
The both ends of bleeder circuit are separately connected the positive and negative electrode line of input, output end；And the second switch circuit includes NPN tri-
Pole pipe, the collector of the PNP triode connect the base stage of the NPN triode, the collector of the NPN triode by a resistance
A high level is connected, emitter connects the gate pole of thyristor；When accumulator positive connects, the base level of the PNP triode
Lower than emitter level, cathode voltage is accessed to the base stage of NPN triode, makes NPN triode by the PNP triode conducting
Saturation conduction constitutes the charge circuit so that gate pole obtains high level, i.e. turn on thyristors；It is described in reverse connection of accumulator
The base level of PNP triode is higher than emitter level, the PNP triode cut-off, and NPN triode is ended, and thyristor is closed,
Cut off the charge circuit.
The base stage of the NPN triode is connected with the first RC parallel circuit over the ground；The cathode of the thyristor connects input
The cathode at end, anode connect the cathode of output end, and it is in parallel to be connected between cathode of the gate pole with input terminal the 2nd RC
Circuit.
A kind of identity card reading device, comprising: power supply adaptor, above-mentioned anti-reverse battery protection circuit；Power supply adaptor
DC output end be connected with the input terminal of anti-reverse battery protection circuit, and by the anti-reverse battery protection circuit to body
Battery in part card reading device charges.
A kind of charger comprising: power supply adaptor, above-mentioned anti-reverse battery protection circuit；The direct current of power supply adaptor
Output end is connected with the input terminal of anti-reverse battery protection circuit, and is read by the anti-reverse battery protection circuit to identity card
Battery in read apparatus charges.
The beneficial effects of the present invention are: guest machine is by IC card to the traveling road of visitor in (1) access control system of the invention
Line is recorded, and is read out by main control module to travelling route, is inquired with realizing the travelling route of visitor,
Effectively visitor can be checked, improve the safety of visited site.(2) use of identity card reading device of the invention
Anti- reverse battery protection circuit, charger can effectively prevent battery over-discharge after battery is reversely connected, and extend
The service life of battery, has prevented security risk, and charger caused by also successfully preventing accumulator polarity to be reversely connected
Damage.
Detailed description of the invention
Fig. 1 is the functional block diagram of access control system of the invention；
Fig. 2 is the circuit block diagram of identity card reading device of the invention；
Fig. 3 is the circuit diagram of the anti-reverse battery protection circuit built in identity card reading device of the invention.
Specific embodiment
As shown in Figure 1, the present invention provides a kind of access control systems with testimony of a witness comparing function, comprising: guest machine is suitable for
The IC card that visitor's travel track is recorded；Wherein the guest machine includes: main control module, is deposited with what the main control module was connected
Store up module, communication module；The main control module is connected with scanner, to read, record the printing surface information of identity card；The master
Control module is also connected with identity card reading device, with chip information in reading identity card；And the main control module be also connected with by
One IC card read-write equipment, and visitor information is written in the IC card；It include: locating module in the IC card, with the positioning mould
The connected microprocessor module of block, for prestoring the map datum in a region and the memory module of visitor information being written；It is depositing
After storing up module write-in visitor information, locating module is carried out activation operation by the microprocessor module, to record the traveling of visitor
Track；And after access, the main control module is read out by travel track of the IC card read-write equipment to visitor.
The main control module uses embedded J1900 industrial control mainboard；The scanner knows IDR-A3 papers-scanning using ancient cooking vessel
OCR identifier, the identity card reading device use application number: disclosed in 201410184166.3 there is identity card RFID to read
The reading device taken；The IC card read-write equipment uses Ming Hua Australia Chinese RF-EYE-U010-MEM non-contact reader-writer；It is described to deposit
It stores up module and uses SD storage card, the communication module is used with WiFi module etc..
The main control module passes through serial ports or USB port and scanner, identity card reading device, IC card read-write equipment phase
Even.
For in IC card, the microprocessor module uses AT91SAM7X256, the memory module uses SD storage card,
And microprocessor module is connected by SD card interface with SD storage card；The locating module uses GPS module, using NEO-7N
GPS module.
The main control module is connected with camera, and the head portrait of visitor is recorded by camera；The main control module is suitable for
Visitor information, head portrait and travel track are subjected to record archive, and Cloud Server storage is uploaded to by communication module, specifically
, the main control module connects camera by USB port.
The two sides of the IC card is all covered with photovoltaic cell, and management of charging and discharging module, Yi Jiyu are equipped in the IC card
The connected sheet lithium battery of the management of charging and discharging module.
The management of charging and discharging module uses Risym TL494C.
The access control system further includes sign-in machine, and the sign-in machine obtains the access data of visitor by Cloud Server；Institute
It states sign-in machine and is connected with and register with IC card read-write equipment；The sign-in machine is located in each office, when visitor reaches purpose office
Behind room, IC card is written and read, to complete to register.
Described register also is adopted with IC card read-write equipment using model same as aforementioned IC card read-write equipment and sign-in machine
With with the same embedded J1900 industrial control mainboard of guest machine；And it also is provided with Ethernet card in the sign-in machine, with realization and cloud
Server is communicated, and after the IC card to visitor is written and read and (registers), the data that will register are sent to Cloud Server, cloud service
Device will register data feedback to guest machine, show that the visitor has arrived at destination.
By this function, the whereabouts of visitor can be timely feedbacked, avoids visitor from being mixed into important, sensitive area and carries out crime work
It is dynamic.
Such as Fig. 2, identity card reading device of the invention be it is portable, use chargeable storage to constitute (preferably lithium electricity
Pond, Ni-Cd nickel-cadmium etc.) power supply, without connecting power supply line.The power supply includes battery case, and is cooperated by spring leaf
Multiple concatenated batteries or a battery in the battery case；When accumulator electric-quantity deficiency can by charging or more
The mode for renewing battery solves.
The control power supply of identity card reading device passes through wireless communication module (such as bluetooth, Zigbee or Wifi or 4G module
Deng) communicate wirelessly with computer.
Anti- reverse battery protection circuit built in the identity card reading device, comprising: input terminal and for connecting electric power storage
The output end in pond；A control circuit, the accumulator positive in the battery case are wherein connected between input terminal and output end
When connecing, the control circuit is suitable for control input, output end conducting constitutes charge circuit；In reverse connection of accumulator, the control
The cathode of cathode and output end that circuit is suitable for control signal disconnects, to cut off charge circuit.
The definition that accumulator positive connects in the technical scheme is that the anode of battery is connected with the anode of output end, battery
Cathode be connected with the cathode of output end；Reverse connection of accumulator, then the anode of battery is connected with the cathode of output end, battery
Cathode is connected with the anode of output end.
The control circuit includes: first switch circuit, by the second switch circuit of the first switch circuit control；It is located at
Connect a thyristor Q1 between the cathode of input terminal and the cathode of output end；When accumulator positive connects or is reversely connected, first switch electricity
Road passes through second switch circuit control thyristor Q1 on and off.
The first switch circuit includes: PNP triode V1, emitter connection input, the output of the PNP triode V1
The base stage of the positive line at end, the PNP triode V1 connects a bleeder circuit, and the both ends of the bleeder circuit are separately connected defeated
Enter, the positive and negative electrode line of output end；And the second switch circuit includes NPN triode V2, the PNP triode V1's
Collector connects the base stage of NPN triode V2 by a resistance R3, and the collector of NPN triode V2 connects a high level,
The gate pole of its emitter connection thyristor Q1；When accumulator positive connects, the base level of the PNP triode V1 is lower than emitter
Cathode voltage, is accessed to the base stage of NPN triode V2, is saturated NPN triode V2 by level, the PNP triode V1 conducting
Conducting, so that gate pole obtains high level, i.e. thyristor Q1 conducting constitutes the charge circuit；It is described in reverse connection of accumulator
The base level of PNP triode V1 is higher than emitter level, the PNP triode V1 cut-off, NPN triode V2 cut-off, brilliant lock
Pipe Q1 is closed, and cuts off the charge circuit；The anode of thyristor Q1 is connected with one end of bleeder circuit.
The base stage of the NPN triode V2 is connected with the first RC parallel circuit, the cathode connection of the thyristor Q1 over the ground
The cathode of input terminal, anode connect the cathode of output end, and the 2nd RC is connected between gate pole and the cathode of input terminal
Parallel circuit.
The first RC parallel circuit includes resistance R6 and capacitor C02；2nd RC parallel circuit includes resistance R4 and capacitor
C01.Influence of the pulse voltage to NPN triode V2 base stage can be effectively prevented by the first RC parallel circuit, is effectively kept away
Exempt to trigger NPN triode saturation conduction due to pulse voltage；And arteries and veins can effectively be prevented by the 2nd RC parallel circuit
Influence of the voltage to gate circuit transistor gate is rushed, is effectively avoided since pulse voltage triggers turn on thyristors.
The working method of above-mentioned anti-reverse battery protection circuit, comprising: when accumulator positive connects, the control circuit is suitable for
Control input, output end conducting constitute charge circuit, and in reverse connection of accumulator, the control circuit is suitable for control signal
Cathode and output end cathode disconnect, to cut off charge circuit.
Such as Fig. 3, the control circuit includes: first switch circuit, by the second switch electricity of the first switch circuit control
Road；Connect a thyristor Q1 between the cathode of input terminal and the cathode of output end；When accumulator positive connects or is reversely connected, first
Switching circuit passes through second switch circuit control thyristor Q1 on and off.
The first switch circuit includes: PNP triode V1, emitter connection input, the output of the PNP triode V1
The base stage of the positive line at end, the PNP triode V1 connects a bleeder circuit, and the both ends of the bleeder circuit are separately connected defeated
Enter, the positive and negative electrode line of output end；And the second switch circuit includes NPN triode V2, the PNP triode V1's
Collector connects the base stage of NPN triode V2 by a resistance, and the collector of NPN triode V2 connects a high level,
The gate pole of emitter connection thyristor Q1；When accumulator positive connects, the base level of the PNP triode V1 is lower than emitter electricity
Flat, cathode voltage is accessed to the base stage of NPN triode V2, leads NPN triode V2 saturation by the PNP triode V1 conducting
Logical, so that gate pole obtains high level, i.e. thyristor Q1 conducting constitutes the charge circuit；In reverse connection of accumulator, the PNP
The base level of triode V1 is higher than emitter level, the PNP triode V1 cut-off, NPN triode V2 cut-off, thyristor Q1
It closes, cuts off the charge circuit.
When normal use, using the input of the DC output end and anti-reverse battery protection circuit of external power supply adaptor
End is connected, and is charged by the anti-reverse battery protection circuit to the battery in identity card reading device.
Identity card reading device further include for device power supply power control unit, control unit and with the control unit
The radio circuit and secure processing units of connection；The radio frequency unit is connected with antenna；The radio circuit generates high frequency
Transmission power to start the ID card and provide energy for it, and is modulated transmitting signal, for transferring data to body
Part card, receives and demodulates the high-frequency signal from the ID card；The secure processing units complete reader and the ID card
Carry out the encryption and decryption when authentication, while the also integrality to the personal information obtained from the ID card, validity
It is veritified；The control unit is communicated with the application systems software being arranged on host computer, and executes application system
The order that software is sent；The communication process of control and the ID card；The coding of signal and decoding；Control reader and the ID card
Between authentication.
The control unit include CPU and the serial ports being connect with the CPU, principal and subordinate USB interface, TFT screen power supply and
Interface, identity card card reading circuit and PS/2 interface.
The radio circuit includes transmitters and receivers；The signal path separated there are two in the radio circuit,
It is respectively used to the data flow of the both direction of the contact ID card；It is transmitted to the data gone in the ID card and passes through transmitter branch
Transmitting, and received from the data of the ID card by receiver branch.
In the transmitter, the oscillator signal of 13.56MHz is generated by the quartz (controlled) oscillator of frequency stabilization first,
To improve the signal-to-noise ratio that the ID card receives signal, oscillator signal is fed to by the A of the baseband signal control of Signal coding
SK modulator；Wherein the baseband signal is the constant voltage signal of keying, herein in the form of binary number accordingly serial code
It represents；ASK modulator carries out ASK modulation to oscillator signal；The signal modulated is directly output in antenna end, and
It is coupled on the ID card；The receiver directly starts from antenna end, and the ID card answer signal being firstly received passes through
ASK detector simultaneously amplifies.
ASK modulated, the logical one of the modulation input terminal of available radio frequencies circuit indicates " having high-frequency signal "
State indicates the state of " no high-frequency signal " with logical zero.
The antenna includes antenna loops and capacitor；Its one side will be matched with identity card card parameter, so that the ID card
Piece can obtain sufficient energy and complete data, and the response data of identity card card is received back, on the other hand
It is matched again with amplifying circuit, makes amplifier efficiency operation.
The reading device is integrated in a terminating machine；After the reading device obtains China second-generation identity card RFID data,
The terminating machine, by after the identity card RFID data and guest operation encapsulation, is sent to pair of a Back end data platform with standard interface
Connection interface, by the back-end platform be responsible for ID card information is verified, by response data packing pass the terminating machine back, finally by
The terminating machine is converted into form workable for client.
The form includes: the information directly browsed on the terminating machine for client or by by identity card authorization
The corresponding service of interim token.The service includes with network, inquiry, payment, communication or the Video service for needing to authorize.
Embodiment 2
On that basis of example 1, a kind of identity card reading device provided in this embodiment the difference is that, the body of the present embodiment
Part card reading device includes external charger.
The charger includes power supply adaptor, as described in Example 1 anti-reverse battery protection circuit；Power supply adaptor
DC output end be connected with the input terminal of anti-reverse battery protection circuit, and by the anti-reverse battery protection circuit to body
Battery in part card reading device charges.
Charger caused by successfully preventing accumulator polarity to be reversely connected by anti-reverse battery protection circuit damages.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (8)
1. a kind of access control system with testimony of a witness comparing function characterized by comprising
Guest machine, the IC card suitable for being recorded to visitor's travel track；Wherein
The guest machine includes: main control module, the memory module that is connected with the main control module, communication module；
The main control module is connected with scanner, to read, record the printing surface information of identity card；
The main control module is also connected with identity card reading device, with chip information in reading identity card；And
The main control module is also connected with by an IC card read-write equipment, and visitor information is written in the IC card；
It include: locating module in the IC card, the microprocessor module being connected with the locating module, for prestoring the ground in a region
Diagram data and the memory module that visitor information is written；
The access control system further includes sign-in machine, and the sign-in machine obtains the access data of visitor by Cloud Server；
The sign-in machine, which is connected with, registers with IC card read-write equipment；
The sign-in machine is located in each office, after visitor reaches purpose office, is written and read to IC card, to complete to sign
It arrives.
2. multi-functional guest system according to claim 1, which is characterized in that
The main control module uses embedded J1900 industrial control mainboard.
3. multi-functional guest system according to claim 1, which is characterized in that the scanner knows IDR-A3 card using ancient cooking vessel
Part scans OCR identifier.
4. multi-functional guest system according to claim 1, which is characterized in that
The identity card reading device includes: the power supply that anti-reverse battery protection circuit and chargeable storage are constituted；
Anti- reverse battery protection circuit includes: input terminal and the output end for connecting battery；Input terminal and output end it
Between be connected with a control circuit, when accumulator positive connects, the control circuit be suitable for control input, output end conducting constitute charging
Circuit, and in reverse connection of accumulator, the cathode of cathode and output end that the control circuit is suitable for control signal is disconnected, with
Cut off charge circuit.
5. multi-functional guest system according to claim 4, which is characterized in that
The control circuit includes: first switch circuit, by the second switch circuit of the first switch circuit control；Positioned at input
It connects between the cathode at end and the cathode of output end a thyristor；When accumulator positive connects or is reversely connected, first switch circuit passes through
Second switch circuit control turn on thyristors or closing；
The first switch circuit includes: PNP triode, and the emitter of the PNP triode connects the anode of input, output end
The base stage of line, the PNP triode connects a bleeder circuit, and the both ends of the bleeder circuit are separately connected input, output end
Positive and negative electrode line；And the second switch circuit includes NPN triode, and the collector of the PNP triode passes through an electricity
Resistance connects the base stage of the NPN triode, and the collector of the NPN triode connects a high level, and emitter connects thyristor
Gate pole；When accumulator positive connects, the base level of the PNP triode is lower than emitter level, and the PNP triode is connected,
The base stage that cathode voltage is accessed to NPN triode makes NPN triode saturation conduction, so that gate pole obtains high level, i.e., brilliant lock
Pipe conducting, constitutes the charge circuit；In reverse connection of accumulator, the base level of the PNP triode is higher than emitter level,
The PNP triode cut-off, NPN triode cut-off, thyristor are closed, and the charge circuit is cut off.
6. multi-functional guest system according to claim 4, which is characterized in that
The base stage of the NPN triode is connected with the first RC parallel circuit over the ground；
The cathode of the cathode connection input terminal of the thyristor, anode connect the cathode of output end, and in gate pole and input
The 2nd RC parallel circuit is connected between the cathode at end.
7. a kind of identity card reading device, characterized by comprising: power supply adaptor, anti-reverse battery protection circuit；Power supply is suitable
The DC output end of orchestration is connected with the input terminal of anti-reverse battery protection circuit, and passes through the anti-reverse battery protection circuit
It charges to the battery in identity card reading device.
8. a kind of charger, characterized by comprising: power supply adaptor, anti-reverse battery protection circuit；Power supply adaptor it is straight
Stream output end is connected with the input terminal of anti-reverse battery protection circuit, and by the anti-reverse battery protection circuit to identity card
Battery in reading device charges.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017206090208 | 2017-05-27 | ||
| CN201720609020 | 2017-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108961481A true CN108961481A (en) | 2018-12-07 |
Family
ID=64495438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810013376.4A Withdrawn CN108961481A (en) | 2017-05-27 | 2018-01-07 | Access control system with testimony of a witness comparing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108961481A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108961480A (en) * | 2017-05-27 | 2018-12-07 | 周惠 | Multi-functional guest system |
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Application publication date: 20181207 |