User's Manual

1.0 INTRODUCTION:

AWID's Sentinel-Prox MR-1824 Reader is one of the best performing Mid-Range Proximity

Readers in the industry. It has the unique combination of long read range with low power

consumption, and in some cases, the power supply in the access control panel is sufficient to

power the MR-1824. This Reader is pre-calibrated for mounting on metallic elbow stands with

simultaneous Wiegand and RS-232 outputs. Its primary applications are Access Control in ADA

compliance applications where wheelchair bound persons can activate the entrance control at a

convenient distance.

1.1 General Descriptions:

• Wall mount or pedestal mount reader

• Indoor or outdoor installation

• LED visual indicator

• Audio/visual feedback

1.2 Special Features:

• Simultaneous Access Control (Wiegand) and Time & Attendance (RS-232) outputs

• Pre-calibrated for mounting on metallic elbow stand with minimum impact on read range

• Permanently sealed electronics for indoor or outdoor applications

• UV stabilized plastic housing

1.3 Suggested Applications

• Access Control

• Asset Management

• Time & Attendance

• RFID

2.0 PRINCIPAL OF OPERATION

This Radio Frequency Identification (RFID) reader or proximity reader uses radio frequency to

identify, locate and track people and objects that carry the appropriate transponders. Proximity

reader can work in none line-of-sight situations and in darkness, bright sun light or through dirt,

grimes and smudges.

A typical proximity system consists of three components – an interrogator or a reader, a

transponder or a card and a data processing panel and/or computer combination. Most RFID

reader has an internal micro-controller, a transmitter, a receiver and a shared transmit/receive

antenna. The card is usually passive (without an internal battery) and consists of an antenna

and an RFID ASIC (Application Specific IC). During operation, the transmitter sends out an

electromagnetic wave to establish a zone of surveillance. When a card enters this zone, the

electromagnetic energy from the reader begins to energize 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 receiving circuits in the reader

senses and decodes this back-scattered signal and hence determines the identity of the tag.

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