What are the working principles and precautions of the access control card reader?
How to choose an access card reader? Let ’s take a look at what to pay attention to when you have a choice!
Note one: should I buy a domestic card reader or an imported card reader?
Real imported card readers have relatively mature technology, low product repair rates, and exquisite designs. The disadvantages are: the price of the product is expensive, the service does not have a domestic card reader in time, and it must use imported branded induction cards from the supporting brand. Proximity cards are also relatively expensive. Unless the customer specifies the use of an imported brand card reader, the author recommends using a domestic card reader, but be sure to choose a card reader provided by a domestic manufacturer with good quality reputation and service. Domestic card readers The appearance has also made great progress in the past two years, and it is fast keeping up with internationally popular styles. Imported card readers are 6-10 times the price of domestic card readers, and imported card prices are 10-20 times the price of domestic cards. The card reader and the core chip of the card are processed by foreign radio frequency chips, and the domestic chip development and production capabilities are not yet available. Imported card readers are recommended to use model card readers and card readers. Relatively speaking The price / performance ratio will be better. Many domestic card readers casually stick a brand that does not exist abroad, mark a country of origin, or have a fake certificate of origin. There are many things like this to buy dog meat. Contractors should pay attention. Do not spent odds, not buy good products, attracted a lot of trouble.
Note two: Should I choose an ID card reader or an IC card reader?
ID card readers are commonly known as read-only contactless IC cards, and IC card readers are collectively known as readable and writable contactless IC cards. The performance, price, and sensing distance of ID cards and ID card readers are better than ICs. Card and IC card reader. If it is only used for access control and attendance or parking lot card, it is recommended to use ID card reader and proximity card. If you need to be compatible with non-constant consumption card, you can only use IC card reader and proximity card. The ID card is more popular on the market and the price / performance ratio is EM card.
Note three: Do not judge the quality of domestic card readers solely from the appearance.
Most domestic card readers use public molds, or copy the appearance of foreign card readers. The molds are common to everyone, and anyone can buy a casing, so even if the same shape of the card reader may be produced by different manufacturers, service and quality It is also different. Engineers must have a detailed understanding of the card reader, do not distinguish only by appearance and price. It is recommended that engineers purchase card readers from the place where the access controller is purchased. Generally, access control controller manufacturers either Will match or sell card readers with similar quality standards. So, how to judge the quality of a card reader? I think that some domestic card readers use analog circuits instead of RF base station chips in order to pursue low production costs. The reader runs a large current and is easy to crash or be damaged. It is not recommended to use it. It is recommended to use an imported RF base station chip reader. It is better to use a card reader from a manufacturer you purchased for more than half a year. Use time and repair rate as well as the manufacturer's quality standards and word of mouth to judge. In addition, the card reader is a long-term equipment, it must be included in the circuit design Crash protection circuit, this is also to be noted.
Note 4: Is it a sealed or unsealed card reader?
It is recommended to use an unsealed card reader. The reason is that even if the buzzer is still exposed, the water will damage the card reader. The material used for the sealant is resin, which is generally used in China. The manual sealing and curing agent is not mixed uniformly. The domestic resin materials are cheap but of poor quality. After a long time of use, there will be conductivity, which will cause the reader to run chaos or freeze. Imported resin is expensive and domestic manufacturers are generally unwilling to use it. It costs a dozen dollars to each card reader. In addition, the sealant is not suitable for the device to dissipate heat, and it also affects the performance of the card reader. Therefore, unless special occasions, it is generally not necessary to use the sealant. Card reader. On some occasions, it is sufficient to protect the card reader from water.
Learn more about access control: Learn how access control card readers work
The reader sends out electromagnetic waves at a fixed frequency, the frequency is generally 13.56MHZ. When the induction card enters the wireless access control system map of the reader's electromagnetic wave radiation range, it will trigger the coil on the induction card, generate current and trigger the induction card. The antenna sends a signal to the card reader. The signal carries the 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-level controller, and finally uploads it to Access control server. The access control server compares the card number with the information in the database to obtain all the card information.
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