Selective rf device activation

The invention claims a activated one or more equipment system and method. According to one embodiment, device and an answer activation code, the activation code with a length field and a shielding field; the field mask comprises a shielding value, the length field board is a shielding field the length to point is the type of the final. After receiving the activation code, the length field compared with a length value of memory, by determining the length field to and a preset standard, and length and field to the preset standard, and activation and an (, and address field exists), and mask field position suitable (mask and) compared with a activation value of memory. Activation and value of matching mask value and memory, and generating a activation signal. The activation signal the circuit according is used for activating connector, comprising a whole device.