The trigger antenna AN01RCP transmits periodically a trigger signal (with a period of 0,5 - 2,4 Sec) at 125 KHz, with a predefined pattern, that awakes the active cards standing in the detection zone [6 - 15 m]. Once awakened, the card, at its turn, sends a signal at 433,92 MHz to the built-in receiver of the antenna. The receiver can activate directly a relay or send out on the bus wiegand the s/n of the tag, that can be managed by a further access control system. The memory of the built-in receiver can hold up to 500 cards. A 10-position rotary switch allows to identify each antenna with a unique number, included in the wiegand protocol (26, 30 or 44 bits). Each antenna can even be enabled by an external PIR (not provided).