ID system and method of writing data in an ID system.

摘要

An ID system includes a data carrier (20) attached to an article to be identified, and an ID controller (10) capable of communicating with the data carrier (20). The data carrier (20) is provided with first and second data buffers (25a, 25b) in addition to a readable/writable memory (26). Data to be written in the memory (26) is temporarily written in the first data buffer (25a). Old data at a location of the memory (26) in which the aforementioned data is to be written is read out of the memory (26) and temporarily stored in the second data buffer (25b). Thereafter, the data in the first data buffer (25a) is written in the memory (26). In order to check whether the data has been written in the memory (26) correctly, the written data is read out of the memory (26). In the event that a write error is detected in the checking operation, the old data of memory (26) will have been preserved in the second data buffer (25b), thereby enabling recovery of the old data.