How to choose an access control card reader?

Access control card reader, generally referred to as "access control reader" or "reader". As a very important part of the access control system, its importance is no less than that of the access controller.

First of all, I would like to introduce to you the classification of card readers:

According to the communication mode: the communication mode of the card reader mainly refers to the communication between the card reader and the controller. Generally divided into two types: Wiegand and RS485.

Let's talk about Wiegand communication first. At present, most of the access control communication types are Wiegand (hereinafter referred to as WG). WG communication is divided into WG26, WG34, WG66, etc. The difference between them lies in the number of digits in the reading card number (WG66 is longer than WG34, and WG34 is longer than WG26). The longer the card number is read, the heavier the card number transmitted. The less likely it is.

Compared with WG communication, RS485 communication has a long transmission distance (1200 meters), and the other is that it can use fewer lines to transmit a variety of different signals. Four lines can transmit the card number, transmit anti-tampering, and tamper-proof signals, and can feedback information from the controller to control LED (light) and BEEP (buzzer), etc. Generally speaking, when the 485 reading head is deployed on the occasion of online patrol (in this case, it only needs to read the card and does not need accessories such as control locks), its communication distance is very advantageous.

Special reminder: Because the RS485 communication has a protocol, it is generally recommended that the reader and the controller be produced by the same manufacturer when selecting a model. If they are from different manufacturers, the problem of the 485 protocol connection will be involved.

2. According to appearance and material: size (large, medium, small), material (metal, plastic).

The size of the card reader is mainly determined according to the installation conditions on-site, especially when it comes to the installation of the glass wall. Usually, the location for installing the card reader will be very narrow in this case, so special attention should be paid when selecting the type.

How to quickly provide a card reader that satisfies users for different decoration styles and different application occasions? In the pen, I know that the personalized access control card reader produced by Max is very popular with Party A during the promotion process. The card reader has a variety of sizes and appearances, and the material is also divided into two types: plastic and metal. For different projects and different applications, the patterns, colors, and crafts on the card reader can be customized quickly, which is enough to be called "using the idea of making a handicraft to make a card reader".

3: The reliability of the access control card reader is mainly reflected in the following aspects

a. Port protection: Because the installation of the card reader will involve wiring (power lines, signal lines, etc. at least 4~6, as many as ten), in the process of construction, it is inevitable to connect the wrong lines if the port is not protected, the card reader will be damaged, which will bring a lot of trouble to the engineering company, so when choosing a product, you must choose an access control card reader with port protection function. The specific identification method is in the case of 12V Carry out tests such as reverse connection, the wrong connection of power line, short circuit of power supply and signal line, etc. If the reverse connection and wrong connection can last for more than 30 minutes, and the card reader of the device is not damaged, then the quality is acceptable.

b. Wide voltage design (drive capability): mainly considering the voltage drop of the power supply when the card reader is wired for a relatively long distance. If there is no wide voltage design, it is very likely that in the actual project ( If the card reader is 100 meters away from the controller), the card reader cannot work normally. Generally speaking, the card reader can work normally at a voltage of 7~30V, and its voltage adaptation range is relatively complete. The test method is also very simple, just use the adjustable power supply to connect the power cord of the card reader to test. Or use a 100-meter network cable to connect the reading head and the access controller directly to see if it works normally.

c. Anti-interference: mainly refers to some occasions, the card reader must inevitably be installed on the surface of the metal object (iron door, stainless steel door), and there is another situation where the card is swiped in and out. The headers need to be installed "back to back". If it is a product with weak anti-interference, when it is installed on the surface of a metal object, the card reading distance will be significantly reduced, or even no card will be read. However, if the products installed "back to back" are not strong in anti-interference, it is very likely that the card reader will be sensed when the card is swiped when entering the door. This is very inconvenient to use. The judgment method for anti-interference is very simple, that is, when choosing a card reader, find an iron plate, stick the card reader on the iron plate, and see if the reading distance changes. It is recommended to choose the IC reader to test. (IC card reading distance is generally 3~5CM). The other is to connect two card readers, place the two card readers side by side at a distance of no more than 5cm, and then swipe the cards on the card readers to see if there is a "serial number".

Author: Written by Anna Zhang from S4A INDUSTRIAL CO., LIMITED