Wireless-tag writing apparatus, wireless-tag reading apparatus, and tag-information writing method

A wireless-tag reading apparatus, comprising:

• a reader that reads tag information written to a wireless tag, the tag information including a first bit string in which the number of bits indicating a predetermined binary value of all bits of the first bit string to be written satisfies a predetermined condition, the first bit string including a second bit string indicating a unique serial number of the first bit string, the second bit string being determined in accordance with the number of bits indicating the predetermined binary value of the bits of the first bit string;
• a memory that stores the predetermined binary value and the predetermined condition;
• and
• a processor configured to
• count, in the first bit string of the tag information read by the reader, the number of bits indicating the predetermined binary value stored in the memory, and
• determine, where the counted number of bits fails to satisfy the predetermined condition stored in the memory, that the tag information read from the wireless tag is invalid.

A wireless-tag writing method for a wireless-tag writing apparatus that writes tag information to a wireless tag, comprising:

• receiving, via a communication interface, tag information to be written to the wireless tag, the tag information including a first bit string to which a plurality of bit strings is coupled, the first bit string including a second bit string indicating a unique serial number;
• storing, in a memory in advance, a predetermined binary value included in the first bit string and a predetermined condition regarding the number of predetermined binary values included in the first bit string;
• counting, in the first bit string of the tag information to be written received via the communication interface, the number of bits indicating the predetermined binary value stored in the memory;
• determining, in accordance with the counted number of bits, the second bit string such that the number of bits indicating the predetermined binary value of all bits of the first bit string satisfies the predetermined condition stored in the memory, and issuing tag information including the first bit string that includes the determined second bit string;
• and
• writing the issued tag information including the first bit string to the wireless tag.