What is RFID reader?

RFID reader is divide into Ic type and id tyoe and the non-contact IC card (inductive IC card) reader for door prohibition is an important part of the access control system. It is the key device for the signal input of the access control system and is related to the stability of the entire access control system. The card reader emits electromagnetic waves at a fixed frequency. The frequency is generally 13.56MHZ. When the proximity card enters the electromagnetic wave radiation range of the reader, it will trigger the coil on the proximity card to generate current and trigger the antenna on the proximity card to read the card. The card reader transmits a signal with card information. The card reader converts the level signal into a digital serial number and transmits it to the local controller. The local controller uploads the information to the upper controller, and finally uploads it to the access control server. The server compares the card number with the information in the database to obtain all the card information.

Introduction
The door disabled IC card (inductive IC card) reader is an important part of the access control system and the key device for the signal input of the access control system. If the access control system is compared to a person, the card reader is like a human eye. It is related to the stability of the entire access control system. If an access control system controller and electric lock are both good, if the quality of the card reader is defective, it will also cause the door not to be opened, which will affect the acceptance and use of the project.
classification
The card reader is divided into contact card reader and non-contact card reader from the card reading distance.
The card reader is divided into single interface card reader, dual interface card reader and multi-card socket contact reader from the readable card interface.
From the interface point of view, the card readers mainly include: parallel port card reader, serial port card reader, USB card reader, PCMICA card reader and IEEE 1394 card reader.
The card reader can be divided into two types from the card reading protocol, one is the 485 card reader and the other is the Wiegand card reader. Wiegand 26 and 34 agreements, these two agreements are conventional agreements.
The card reader can be divided into IC card reader and ID card reader from the card reader type. The IC card reader is a non-contact IC card reading and writing device, which realizes the connection with the PC through the USB interface, and a single 5V Power supply or keyboard port to get electricity, it supports access to all functions of the radio frequency card. This series of equipment is used in card issuance systems for access control, attendance, conference sign-in, highways, tourism, parking lots, bus tolls, shopping malls, membership systems, and various application systems.
The ID card reader is used to read ID cards. The reader supports plug-and-play. It can be plugged and plugged at will during use. No external power supply is required. The user does not need to load any drivers. The windows system directly treats it as a HID device. keyboard. After the computer's USB port is connected to the card reader, the card reader starts self-checking and initialization with a beep, and then the initialization is successful with a beep, and it enters the state of waiting for card swipe.
ID card reader, information query, Internet cafe registration, book borrowing, conference sign-in, access control, etc.
working principle
The card reader emits electromagnetic waves at a fixed frequency. The frequency is generally 13.56MHZ. When the proximity card enters the electromagnetic wave radiation range of the reader, it will trigger the coil on the proximity card to generate current and trigger the antenna on the proximity card to read the card. The card reader transmits a signal with card information. The card reader converts the level signal into a digital serial number and transmits it to the local controller. The local controller uploads the information to the upper controller, and finally uploads it to the access control server. The server compares the card number with the information in the database to obtain all the card information.
Parameter Description
Parameters of the access control card reader Green: D0/RX/4R+White: D0/TX/4R-Yellow: BEEP
Green: D0 represents character 0 transmitted by the micro root
RX stands for one of the eight core lines of network communication
4R+ represents the positive pole of the 485 bus system communication line
White: D0 represents the 0th character transmitted by the micro root (usually it should be D1 here)
TX stands for one of the eight-core lines of network communication
4R-represents the negative pole of the 485 bus system communication line
Yellow: Sound and light feedback line
RED +DC(5-16V)
Red DC (5-16V)
BLACK GND
Black ground
GREEN DATA 0(DATA)
Green data 0
WHITE DATA 1(CLOCK)
White data 1
ORANGE GREEN LED
Orange diode lamp
YELLOW BUZZER
Yellow buzzer
BLUE HOLD
Blue keep holding