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CDVI PASS

CDVI Pass is a radio system for the access control of persons and vehicles. It is mainly composed by 2 or 3 devices : one active tag, one trigger antenna with or without built-in receiver and one receiver. It finds application in domestic, pubblic, residential and industrial environment, both for personal and vehicular use. The users or the vehicles carrying the active card and standing in the detection zone of the trigger aerial, are identified waking-up the tag, which is normally in stand-by and decoding the tag information. The serial number of the tag, that identifies uniquely the user, is then transmitted via radio to the receiver which, at its turn, sends the information to any access control system, through a wiegand line or RS-485.

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CDVI Pass is based on an active tag, equipped with a radio double technology, passive (at 125 KHz ) and active (at 433,92 MHz). The active
tag is always in stand-by: when it arrives inside the aerial detection zone, it wakes-up and starts transmitting at 433,93 MHz. In this way its battery consumption is highly limited. If, whilst remaining in the detection zone, it does not move, the internal motion sensor sets it in stand-by. The wake-up signal at 125 KHz carries even a byte with the serial number of the antenna ( 1 – 10 ). Once awake, and as long as it stands in the field at 125 Khz, the tag transmits an encrypted signal with its serial number and the serial number of the antenna. The receiver decrypts the signal and extracts this information. If the output set is wiegand or RS-485 (*), the information is sent on the wiegand bus or RS-485 line otherwise if the output is “relay” the receiver activates the relay ( 1 or 2 ) if the S/N of the tag has been authorized. In this case the receiver can drive directly a automatic closure system ( gate, road barrier, door, etc..). If it is moved onto another field where is operating a trigger antenna with a different ID, it will restart immediately the signal at 433 MHz.