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This research is about the interface between a RFID reader device and a host for controlling the RFID tag memory access operations. The traditional RFID reader interfaces are often inflexible to deal with the various forms of integration for the heterogeneous RFID reader devices. Also the industries are demanding a RFID device interface to be easier to handle and to improve the processing speed for the RFID tag access operations. Thus, this research analyzes the existing methods for controlling RFID tag memory access, and then proposes a light-weight RFID device interface, called SRP (Simple Reader Protocol). SRP specifies the message formats, supports access operations, and enables the RFID reader configuration about RFID tag memory access. SRP is expected to help the integrated control for the heterogeneous RFID reader devices and further make RFID system development efficient.