EPC Memory Bank
EPC memory is writable, allowing EPC values to be read and rewritten as needed.
This is the primary memory area for storing EPCs, which can range from 96 to 496 bits. The EPC memory consists of: - 16-bit Cyclic Redundancy Check (CRC-16) for error detection - 16-bit Protocol Control (PC) for managing EPC transmission - Starting from Word 2, the actual EPC number
The EPC memory bank is managed by the Protocol Control (PC) field, which determines how many bits of EPC data are sent back to the reader.
Why Duplicate EPCs Occur
The EPC can be duplicated (non-unique) because the tag manufacturing process does not guarantee uniqueness. Manufacturers may prefill the EPC with the same default value across all tags, or leave it blank, requiring the user to write the EPC manually.
In this situation, user must perform the write process using the desired hexadecimal ID and ensure that the value is unique to prevent duplication between tags.
Guide to Writing EPC: