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PROPRIETARY AND CONFIDENTIAL DRAFT 28/Feb/03

Detailed Component Descriptions
Chapter 1: Introduction

There are two dry-contact relays featured on the Master Alarm that provide
signals to outputs. The outputs can be wired to either the normally-closed or
normally-open contacts. They are located on the Master Alarm Breakout P.C.
Board. One is marked MAIN ALARM, and the other is marked AUX
ALARM. For wiring diagrams, refer to the foldouts at the rear of this manual.

• MAIN ALARM

• When the Master Alarm is in alarm condition, this relay activates.

• When the Master Alarm is silenced, this relay deactivates.

• When the Master Alarm power is off, this relay activates until the
power comes back on.
• AUX ALARM

• When the Master Alarm is in alarm condition, this relay activates.

• When the Master Alarm is silenced, this relay stays activated.

• When the Master Alarm condition is remedied, this relay deactivates.

The Master Alarm also has an output relay that can be used to interface with a
building automation system.

The Area Alarm has a relay output located on the Area Alarm Breakout P.C.
Board. It operates the same way as the AUX ALARM relay does on the Master
Alarm. For wiring diagrams, refer to the foldouts at the rear of this manual.

If the Network Communications Board is installed in the Area Alarm, the
Master Alarm can monitor the operation and condition of MedPlus
TotalAlert™ Area Alarm Modules. Area Alarm Modules and transducers are
programmed at the factory with unique serial numbers and manufacturing
dates. So the Master Alarms can identify individual alarm components by
using their unique serial numbers.

The Master Alarm goes into an alarm condition when any one of the following
system or source alarms occur:
• Wiring to a sensor or switch is disconnected or interrupted.

• Alarm component fails and interrupts the system monitoring capability.
• If the Network Communications Board is installed in the Area Alarm, and
the Ethernet wiring is disconnected or interrupted.

• If the Network Communications Board is installed in the Area Alarm, and
the Area Display Modules or transducers have a fault.

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