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102
LenelProx Readers
LenelProx readers are radio-frequency proximity readers (with or without integrated keypads). OnGuard
currently supports the following models:
•
LenelProx LPMM-6800
•
LenelProx LPSP-6820
•
LenelProx LPKP-6840
•
LenelProx LPSR-2400
•
LenelProx LPRKP-4600
•
LenelProx LPMR-1824 and LPMR-1824 MC
•
LenelProx LPLR-911
The RFID (Radio Frequency Identification) readers, or proximity readers, use radio frequency to identify,
locate, and track people and objects that carry the appropriate transponders. Proximity readers can work in
non-line-of-sight situations.
A typical proximity system consists of three components – an interrogator (reader), a transponder (card,
keytag, etc.), and a data processing panel and/or computer combination. Most RFID readers have an internal
micro-controller, a transmitter, a receiver and a shared transmit/receive antenna.
The credential is usually passive and consists of an antenna and an RFID ASIC (Application Specific
Integrated Circuits). During operation, the reader sends out an electromagnetic wave to establish a zone of
surveillance. When a card enters this zone, the electromagnetic energy from the reader interacts with the IC
in the tag. Once the IC is energized, it goes through an initialization process and begins to broadcast its
identity. This process utilizes a low-energy back-scattering technology that selectively reflects or back-
scatters the electromagnetic energy back to the reader. The circuits in the reader receive and decode this
back-scattered signal and determine the identity of the tag.
102.1
Read Range
To measure the read distance between the reader and card, grasp the card by the corner or near the slot and
move the card slowly toward the reader, with the card surface parallel to the reader until a beep occurs. The
beep indicates that the reader detects and reads the card. In order the read again, the card must be fully
withdrawn from the reader's field of surveillance and then presented again. During normal operation, the
card can be presented at any angle relative to the reader; however, this will result in slight variation of read
range.
Note:
Waving the card in front of the reader will result in a diminished read range.
102.2
Installation Guidelines
Conduct a site survey before starting installation to avoid possible sources of interference. If the reader is not
installed properly, the performance will be degraded. Reader damage is also possible.
Hardware Installation Guide
495
revision 7 —
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