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Setup and Testing
Each Transponder and the devices connected to it are set up and can be tested remotely from the Central Console.
Also, each Transponder reports any problems, such as low battery, immediately upon detecting them.
Function During an Alarm
When a Receiver or Alert Unit detects an alarm, it goes into an "Off Normal" state. To quickly locate any devices
which might be in the "Off Normal" state, the Transponder issues global commands (which are interpreted
simultaneously by all of its devices) approximately 10 times per second. These global commands are followed by
commands to specific devices to determine the nature of the "Off Normal" condition and, in the case of an alarm (or
test), to obtain the Transmitter Identification Number, Transmitter battery condition, and received signal strength. This
information is then sent to the Central Console, by either wire or through ProxLink radios, where it is used to
graphically display the identity of the subscriber transmitting the alarm and to determine the subscriber's location.
Component Descriptions – EA120 Alert Unit
Features
Provides output for alarm annunciation through the Siren/Strobe or other third party switched device.
Provides output to Siren/Strobe to indicate a successful Transmitter test.
Indoor and Outdoor enclosures available.
AC powered with battery backup.
Activated on command from the Central Station through the Transponder.
Reports tampering, AC power loss, backup battery power to the Transponder, and output status.
Description
An Alert Unit is a control module that communicates with the Transponder on the MUX Bus. In most installations, it is
used to activate Siren/Strobe units or other switched devices in the event of an alarm. The Alert Unit also reports
tampering, AC power loss, and backup battery level to the Transponder.
Installation
The Alert Unit may be housed in either a metal indoor enclosure or an outdoor enclosure (similar to the Outdoor
Receiver enclosure), depending on the application. The Strobe/Siren units are always mounted in outdoor locations.
Function
The Alert Unit has backup battery power in addition to AC power. The Alert Unit Driver contains a microprocessor that
communicates with the Transponder for Strobe and Siren commands, status reports, and trouble indications. The
troubles monitored are "Tamper," "Loss of AC Power," and "Low Battery."
Test Acknowledgment
In addition to the function of attracting attention in the event of an emergency, the Strobe unit is used to acknowledge
a successful test of a Transmitter. The Alert Unit can be configured to cause a Siren to emit a short tone and the
strobe to flash for a successful Transmitter test.
Function During an Alarm
In the event of an alarm, the Alert Unit receives a signal from the Transponder and begins powering the Siren/Strobe
(or other switched device). The Siren/Strobe will be active until the alarm is restored at the Central Console.
Security Escort Training
Page 17 of 142
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