English
There are several systems and standards that are used for contact-free identification using cards and identifiers. The the most widely-used types include the 125 kHz Unique and MIFARE, MIFARE DESFire.
The Unique EM4100/EM4102 is the most widely used type in the Czech Republic for standard applications; it is R/O (read only), it is not re-writable, with 125 KHz operating frequency.
The Mifare is a system for cards in accordance with ISO14443A, it works on 13.56 MHz frequency, it is both R/W (read/write), and it is used for access and security systems. In recent years it has been gradually replaced by the MIFARE DESFire standard, which mainly offers a higher security.
Mifare DESFire je standard s vysokou bezpečností založenou na The Mifare DESFire is a high security standard based on the rithm 3DES (Triple DES) encrypting algo, used e.g. for electronic cards and wallets (Czech Railways, OpenCard), in accordance with ISO14443A; it works on 13.56 MHz frequency, the R/W.
The Wiegand interface
The RFID readers (contact-free scanning of cards and similar identifiers) are usually equipped with the Wiegand interface with the protocol types Wiegand 26, Wiegand 34 or Wiegand 42 bits. The data transmission takes place over two data wires Data0 (or Data L) and Data1 (or Data H) with a common signal GND. The data wires have the idle level log. H, if communication takes place, the corresponding wire goes to the level log. L. The voltage level is 5 V.
A reader with the Wiegand interface can be connected up to the distance of 150 m with a shielded cable with a miniumum 0.35 mm2 cross section.
Sensors with the Wiegand protocol can be connected to the C-WG-0503S module or to the MX-0301 submodule.