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Description
The Receivers are located throughout the protected area, including building interiors.
Each Receiver contains a radio receiver to detect the transmissions from Transmitters, and a microcomputer to
decode and interpret the received test and alarm messages. In addition, the microcomputer monitors tampering and
other problems, and reports such conditions to the Transponder.
Each Receiver contains an internal self-contained sounder. These sounders are optionally activated if the Receiver
has detected an alarm transmission.
Indoor Receivers are typically mounted on inside walls and are housed in small beige, rectangular units. Indoor
Receivers have one red and one green light. The green light is used to indicate a successful test of a Transmitter; the
red light is only illuminated during certain system tests and during alarms.
Outdoor Receivers are contained in small weatherproof enclosures typically mounted on the sides of buildings and on
light posts. Outdoor Receivers do not have the visible red and green LED's. Outdoors, the strobe lights connected to
the Alert Units flash to acknowledge a successful test.
Function During an Alarm
In the event of an alarm, the Receivers detect an alarm signal from a Transmitter and send this information to the
Transponder. The Transponder forwards this information the Central Console where, using the reported information
from all the Receivers that detected the signal, the location of the transmission is graphically displayed on the Alarm
Map.
Buddy Check
In addition to its radio receiver, each Receiver also contains a transmitter functionally similar to the hand held
Transmitters. This transmitter can be commanded by the Central Console to transmit a test message to other nearby
Receivers. This Buddy Checking is performed periodically to verify that the Receivers are functioning satisfactorily.
Results of the Buddy Check are compared with the results of earlier Buddy Checks, and any changes in a Receiver's
sensitivity are reported to the Central Console where this information is stored in a system database.
Component Descriptions – EA500 Transponder
Features
Relays alarm and test signals from the Receiver to the Central Console.
Can support a combined total of 64 Receivers and Alert Units.
AC powered with battery backup for all Receivers.
Can provide power to SE485 Interface and/or Spread Spectrum Radio.
Available in a large or small indoor enclosure.
Monitors Receivers and Alert Units 10 times per second for alarms, tests, tamper notification, and power loss.
Description
The Transponder is a device controller for up to 64 devices -- any combination of Receivers and Alert Units. Its
primary function is to monitor the Receivers and Alert Units and report conditions and events to the Central Console
via either wire or ProxLink radios. It also provides power output to certain devices.
Installation
The Transponder can be mounted in one of two different sized enclosures. It is always mounted indoors. The devices
are connected to the Transponder by means of eight four-wire Multiplex Busses, two wires for power and two wires
for data. Each bus is capable of supporting up to eight devices. A Security Escort System supports up to 255
Transponders.
Configuration
Each Receiver and Alert Unit is identified to its Transponder by a Multiplex Address which is set during system
installation using a multi-position switch on the Receiver or Alert Unit circuit board. Transponders communicate on
the data bus with individual Multiplex devices by issuing commands, which contain the Receiver or Alert Unit's
Multiplex Address.
Security Escort Training
Page 16 of 142
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