ISO14443 IS014443A/B: Ultra-short distance smart card standard. This standard specifies the function and operating standard of a short-range non-contact smart card with a distance of 7-15 cm. The frequency used is 13.56 MHz. IS014443 defines two types of protocols: TYPE A and TYPE B. The communication rate is 106 kbit/s. Their difference mainly lies in the modulation depth of the carrier and the bit encoding method. TYPE A uses the On-Off keying Manchester code, and TYPE B uses the NRZ-L BPSK code. Compared with TYPE A, TYPE B has the advantages of uninterrupted transmission energy, higher speed, and strong anti-interference ability. The core of RFID is anti-collision technology, which is also the main difference from contact IC cards. IS014443-3 specifies the anti-collision mechanism of TYPEA and TYPE B. The principle of the anti-collision mechanism is different. The former is based on the bit collision detection protocol, and the TYPE B communication series of command sequences complete the anti-collision. The current second-generation electronic ID card. The standard adopted is the IS014443 TYPE B protocol. ISO15693 IS015693 (ISO SC17lWG8): Short-distance smart card standard, this standard specifies a distance of up to one meter non-contact smart card, the use of frequency is 13.56MHz, the design is simple to make the cost of production readers lower than the IS014443, most Used for access control, attendance assessment, etc. Now many companies use access control cards to use this type of standard. IS015693 uses anti-collision mechanism and time-sharing query to complete the anti-collision mechanism. The anti-collision mechanism makes it possible to correctly operate multiple tags that are simultaneously in the read-write area, which not only facilitates the operation but also increases the speed of operation. The difference between Iso10536, iso15693, iso14443
The ISO 10536 standard was mainly developed between 1992 and 1995. Due to the high cost of this kind of card, there are few advantages compared with the contact type IC card, so the card has never been sold in the market. The ISO 14443 and ISO 15693 standards began operations in 1995. A single system entered the market in 1999. The completion of the two standards was after 2000. Both are 13.56MHz alternating signal carrier frequency: ISO15693 read and write distance is relatively long, of course, this is also related to the application system antenna shape and transmit power; and ISO 14443 read and write distance is closer, but the application is more extensive, the current The standard adopted by the second-generation electronic ID card is the ISO 14443 TYPE B protocol. ISO14443 defines two types of protocols: TYPE A and TYPE B. The communication rate is 106 kbits/s, and their difference mainly lies in the modulation depth of the carrier and the bit encoding method. When transmitting signals from the PCD to the PICC, TYPE A uses an improved Miller encoding method to modulate the ASK signal with a depth of 100%, and TYPE B uses an NRZ encoding method to modulate an ASK signal with a depth of 10%.