Patent ID: 8334755

Claim:
A method for an apparatus to recognize a plurality of radio frequency identification (hereinafter referred to as RFID) tag readers previously obtaining a protocol address, comprising: requesting the protocol address of the RFID reader and generating a request message including the hardware address and protocol address of the apparatus, the request message including a timestamp indicating a generation time; transmitting the request message; receiving a response message for the request message from one of the plurality of RFID readers, the response message including the hardware address and protocol address of the corresponding RFID reader and the timestamp of the request message; extracting the hardware address and protocol address of the RFID reader from the response message when the timestamp included in the response message satisfies a set condition; and matching the extracted protocol address to the hardware address of the extracted RFID reader, wherein the request message and the response message further include a discovery port field indicating a port for obtaining service configuration information of the RFID reader.