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Proximity cards

The proximity cards are devices sending signals to the reader at any moment to know the exact position of each one. They are also called RFID devices (Radio Frequency Identification) and they aim to transmit the identity of an object by radio waves. One of the advantages of the radio frequency use (instead of infrared, for example) is that direct vision between transmitter and receiver is not required.

Proximity card
Fig. 6.1 Proximity card.

The RFID reader or transceiver is made up of an antenna, a transceiver and a decoder. The reader sends signals periodically to see if there is some label around. When it catches the label signals (which contains its identification information), it extracts the information and goes to the data processing subsystem.

Systems using low frequencies also have low costs and lowers use distance. Those that use higher frequencies provide higher reading areas and faster reading speeds. Thus, those who use LF (Low Frequency), used commonly for the animal identification, trace of barrels of beer, or like key of cars with system burglar alarm.

The main uses that have these cards now could be for libraries and book trace, building access control, trace of luggage in airlines, clothes and article trace, and clinical patients with memory illness.

RFID labels are commonly used in commercial trace of packages, trucks and shipments tows. In addition, they are valid for identification of accreditations, replacing previous magnetic cards. It is only necessary to approach these cards to the reader to authenticate the carrier. Thus, it is possible to control the articles or people within a facility. This is valid for stores, warehouses, museums, hotels, hospitals, hotels, schools, etc.

With ISS we can configure as many cards and readers as necessary to have a total control on your company. The cards are visualized in listing form where it is possible to register new cards and to eliminate or to modify the existing ones.

Proximity card listing
Fig. 6.2. Proximity card listing.

The process of create, delete or modification of a card is so simple that it is only necessary to fill up a form.

Create a proximity card
Fig. 6.3. Create a proximity card.

Whenever a reader detects the presence of a card, an alarm warning is generated for this event.

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