No changes in the tad data can be made at a later date. Write once, read many tag - Data can be written into the tag when it is first used by a separate device. No changes in the tad data can be made at a later date. Read and Write - Data can be read from the tag and new or additional data can be written to the tag at some or all read locations. Distance - This requirement is application dependent.
Write distance is typically less than read distance.
This may be desirable in some applications to prevent reading of other tags further away which could provide false information at the desired read point. Read only the tag of the person directly in front of the access point. Average Read Distance - Typical is 2 to 10 feet. This may be a requirement for moving items or reading multiple items at the same time. Maximum Read Distance - Typical is 20 to 1000 feet.