A microchip attached to an antenna that picks up signals from and sends signals to a reader. The tag contains a unique serial number, but may have other information, such as a customers' account number. RFID tags can be active tags, passive tags and semi-passive tags. RFID tags are sometimes referred to as transponders.
The antenna is the conductive element that enables the tag to send and receive data. Passive tags usually have a coiled antenna that couples with the coiled antenna of the reader to form a magnetic field. The tag draws power from this field.
Other unlisted, specialized, or proprietary RFID products.
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An RFID tag without a battery. When radio waves from the reader reach the chip’s antenna, it creates a magnetic field. The tag draws power from the field and is able to send back information stored on the chip.
Similar to active tags, but the battery is used to run the microchip's circuitry but not to communicate with the reader. Some semi-passive tags sleep until they are woken up by a signal from the reader, which conserves battery life.
An RFID tag that comes with a battery that is used to power the microchip’s circuitry and transmit a signal to a reader. Active tags can be read from 100 feet or more away.
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RS485 is a balanced serial interface for the transmission of digital data. The advantage of a balanced signal is the greater immunity to noise. The difference between RS422 and RS485 is that RS485 can be transformed into a multi-point application.
Transistor-transistor logic (TTL) is a common type of digital circuit in which the output is derived from two transistors. More commonly, however, TTL is used to designate any type of digital input or device.
Other unlisted, specialized, or proprietary interfaces.
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RFID products use low, high, ultra-high and microwave frequencies. Each frequency has advantages and disadvantages that make them more suitable for some applications than for others.
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The distance from which a reader can communicate with a tag. Active tags have a longer read range than passive tags because they use a battery to transmit signals to the reader. With passive tags, the read range is influenced by frequency, reader output power, antenna design, and method of powering up the tag.
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The range of temperatures through which the RFID product is designed to operate.
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A general term used to cover methods of preventing radio waves from one device from interfering with radio waves from another. Anti-collision algorithms are also used to read more than one tag in the same reader's field.
A mode of reader operation where a transponder ID is reported continuously while that transponder remains in the field of the reader.
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