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1. Overview of RFID technology:
Schematic diagram of radio frequency identification (RFID) system
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Radio frequency identification (RFID) technology refers to a method of identifying items realized by radio technology. The basic principle of radio frequency identification is to attach an electronic tag to the item to be identified. When the item attached with the electronic tag passes through a specific area, another important device of the radio frequency identification system can read out the information in the electronic tag. The stored information is read out in a contactless manner and sent to the computer. The working principle of the radio frequency identification system is shown in the figure.
electronic label
The electronic tag is a key component of the radio frequency identification system. An electronic tag is usually composed of an electronic tag antenna and a dedicated chip. The electronic tag (or electronic tag dedicated chip) itself is an electronic system. The electronic tag stores the identification information of the item to be identified, and when it receives the inquiry signal sent by the reader, it will wirelessly transmit the unique identification information stored by itself to the reader. The identifying information of the item to be identified in the electronic tag is stored in the storage chip in the electronic tag in the form of electronic data.
Reader
The function of the reader is to read the information in the electronic tag on the one hand, and to write information into the electronic tag on the other hand, which is why it is called a reader. The specific area through which the electronic tag mentioned above passes is called the read-write area of the RFID system read-out device. The characteristics of the read-write area are determined by the antenna of the read-out device, the radio frequency power emitted by it, the reflection performance of the electronic tag, and the sensitivity of the read-out device to receive signals.
The distance between the reader and the electronic tag when it can read the information in the electronic tag is called the recognition distance.
2. Three-dimensional garage vehicle identification system
The three-dimensional garage vehicle identification system uses ultra-high frequency RFID technology (915MHZ) to realize long-distance identification of vehicle information, and transmits the corresponding information between the vehicle and the garage, such as the parking space number and the payment status, to the garage control system to achieve rapid Features such as parking, quick pickup, and non-stop charging.
The system can realize functions:
One card for one vehicle, through the radio frequency smart card to transmit information to the plc data center, to realize the automatic stopping and fetching of each vehicle without human operation.
Temporary vehicle management: Temporary tags can be applied to foreign vehicles, and authorization is granted by writing restricted time information to the tags at the place where the tags are handled, and the time period for vehicle entry and exit can be restricted. For over-limit vehicles, the system will give an alarm.
In order to make the operation simple, convenient and friendly, the system adopts a full Chinese menu operation interface.
The system can provide complete financial management functions and automatically form various reports.
The scrolling LED Chinese electronic display prompts make it clear to users and managers.
Vehicle entry and exit are fully intelligent and logic self-locking control system, which strictly controls the entry and exit behavior of cardholders in line with the requirements of “one card, one vehicle”.
Special handling functions for special vehicles.
The system has good compatibility and expandable functions.
3. The basic composition of the system:
The reader and the microwave identification card installed on the vehicle constitute the core of the information transmission of the system.
The reader is connected to the plate antenna through a coaxial cable, and is connected to the PLC of the stereo garage through the communication line. The reader is preset with the RS232RS485WG26WG34 standard transmission interface, and has the ability to make adjustments according to the requirements of the PLC.
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Parking workflow:
1. Vehicle approaching recognition range (0~~10m);
2. The reader/writer recognizes vehicle (electronic tag) information, such as parking space number, entry time, vehicle owner information, etc., and transmits it to the PLC in real time (50 milliseconds);
3. Prepare for PLC control garage;
4. The vehicle enters the parking area and stops.
Work process of picking up the car:
1. The vehicle owner is approaching the recognition range (0~~10 meters);
2. The reader/writer recognizes the vehicle (electronic tag) information and transmits it to the PLC in real time (50 milliseconds);
3. PLC will transfer the corresponding car to the driving area;
4. The owner arrives at the pickup area and picks up the vehicle.
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4. Equipment performance parameters:
1. Reader:
Read and write tags Electronic tags that comply with ISO-18000-6B standards
Working frequency 902-928MHz (may vary slightly depending on the country or region)
Working mode: Working in the mode of wide-spectrum frequency hopping (FHSS) or fixed frequency transmission
Output power 27—32dBm (adjustable between 27—32dBm, factory setting: 32dBm
Reading distance: Reading distance ≥8m, writing distance ≥ 3m
Card reading speed: an average reading time of 6ms per 32bits
Card writing speed Average writing time per 32bits is 50ms
Security mechanism can check the legality of electronic tags
Number of cards read at a time With anti-collision detection function, 30 electronic tags can be read in batches at a time
Card reading mode: Automatically read the card at regular intervals, or it can be controlled by input trigger signal or command
Power supply Equipped with a power converter with 220V AC input + 5V/4A DC output
Average power ≤ 12W
Dimensions 225mm×166mm×39mm
Weight Aluminum alloy shell, the weight of the whole machine is about 2Kg
Working temperature -20℃～+70℃
2. JX-900-12-H65 panel antenna:
Frequency range 902 MHz ~ 928 MHz
Operating bandwidth 26 MHz
Voltage standing wave ratio ≤ 1.35
Gain 12 dB
Maximum power 500 W
Impedance 50 Ω
Polarization method vertical
Length 1.2 M
Wind resistance 60 M/S
Lightning protection DC grounding
Socket model N type
3. 915M radio frequency tag:
Working mode R/W (read and write), can be repeatedly erased and written more than 100,000 times
Storage capacity 64-bit ID number, 216 bytes of user storage space
Working frequency 902～928MHz
Meet the standard ISO18000-6B
Reading distance 0～10m (cooperate with different antennas)
Working temperature -20℃～70℃
Adapt to vehicle speed ＜160km/h
Application features Suitable for single tag, multi-tag identification, identification of mobile state tags
Supporting reader JX05 series reader
Dimensions 85.6×54×1.0mm
Installation method Use in air medium, use in glass medium
Application fields Personnel access control, campus cards, highway toll collection, parking lot vehicle management and other fields
4. The working principle of the system: the reader in the system product sends the high-frequency carrier signal (902~928MHz) through the antenna; the radio frequency card is activated after entering the high-frequency antenna working area, and emits the high frequency carrying the target identification code The encrypted carrier signal (902~928MHz) is received by the antenna, and after receiving and processing by the reader, the target identification code is extracted and sent to the computer to complete the preset system management function.
5. Introduction to the card writing software:
The main function of the card writing software is to write the basic information of the vehicle into the electronic tag and store the data in the database, otherwise the card cannot be used. The registration content includes the card number, car model, number of months of payment, license plate, unit or name, and contact number; the unit or name and contact number can be omitted. The main data written in the RFID card are: vehicle number plate, number plate type, vehicle type, validity period, etc.
For the microwave identification card to be used in the car, a new card must be registered and data (license plate number, car model, expiry date, etc.) must be written into the card.
Six, management software introduction:
The management software provides users with effective management measures and means, which can manage, operate, maintain, and manage personnel and other management of basic information and past information of all vehicles. The basic functions are as follows:
Personnel authority management function
Card issuance function
For the microwave identification card to be used in the car, you must first register a new card and write the data (license plate number, car model, expiration date, etc.) into the card, otherwise the card cannot be used. The registration content includes the card number, car model, number of months of payment, License plate, unit or name, contact phone number; among them, the unit or name and contact phone number need not be entered.
Charging function: charging according to charging rules.
Log off, freeze, report loss, and unfreeze functions
It is required to cancel, freeze, report loss, and unfreeze the card according to the entered card number.
Query function
It is required to be able to query the results of the registered card information, payment status, passing information, temporary card passing and payment according to the given query conditions, and print the query results.
Statistics function
It is required to be able to count the results of the registered card information, payment status, passing information, temporary card passing and payment according to the given statistical conditions, and to print the statistical results.
Report printing function
It is required to print out the results according to the query and statistical conditions, and to be able to set the printer and printing conditions (such as: paper, page, number of copies, number of pages).
Code maintenance function
The basic data that may change in the future can be maintained, and the fee amount and the name of the entrance and exit can be adjusted flexibly. The maintenance content includes addition, deletion, and modification.
Database maintenance function
Data can be maintained. Data maintenance refers to the maintenance of data stored in the system database. The maintenance includes data backup and deletion of historical records.
Automatic maintenance requires the system to automatically maintain card information in a timely manner, that is, to cancel cards that have expired in a timely manner.
Automatic maintenance function
System maintenance function
System maintenance mainly completes functions related to system security, including adding and modifying the user name and password of the system administrator.
system security
In order to enable the system to operate safely and normally, special personnel must be responsible for operations that may cause system chaos. In order to meet this requirement, operators must be restricted by necessary operations. The restriction methods are mainly through the use of system maintenance passwords and users. To achieve the name.
(TextLaiwu Jiexun Electronics Co., Ltd. jiexunlw)
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