Reader/Writer Mode

In reader/writer mode, the NFC device generates an RF field and communicates with a passive NFC tag. The device can read NDEF messages, write data, and execute commands on the tag. This is the most common NFC mode, used for scanning NFC tags on products, posters, business cards, and IoT devices. Every NFC smartphone supports reader/writer mode for interacting with all five NFC Forum tag types.

Vue d'ensemble technique

The initiator device generates a 13.56 MHz RF field providing both the communication carrier and energy to power the passive tag. Communication follows ISO 14443 (Types 1/2/4) or ISO 15693 (Type 5) depending on the tag type. The reader sends commands and the tag responds using load modulation of the RF field. Data rates range from 26 kbps (Type 5) to 424 kbps (Type 4). Anti-collision protocols handle multiple tags in the field simultaneously.