| 摘要 |
PROBLEM TO BE SOLVED: To easily specify, even when failure occurs in communication between a plurality of modules, the cause of the failure.SOLUTION: When an RFID tag that is a second module consecutively receives the same command a plurality of times from an RFID control unit that is a first module, transmits a response to the command with number information added thereto indicating the number of times that the RFID tag has received the same command. When the RFID control unit receives the response including the number information to the command transmitted to the RFID tag, stores a reception history of the number information. When re-transmitting the same command, the RFID control unit may transmit the command with re-transmission information added thereto indicating that the command is re-transmission. |
