American Dynamics MegaPower 3200 Installation Guide download pdf (Page 75)

MEGAPOWER CPU 8200-0421-03, REV. G

ADMINISTRATOR’S GUIDE

73 of 82

APPENDIX G: Alarm Programming Overview

An alarm is a signal generated by an external device

connected to the MegaPower CPU system, either

directly or through an alarm interface unit. External

alarm signals can be generated in different ways,

such as opening a locked door or window or

detecting a moving object. In this guide, all types of

alarm signals are referred to as alarm contacts. The

system can be programmed to respond to up 4,096

alarm contacts.

Alarm Receipt

The MegaPower CPU receives external alarm

contact signals via RS-232 communications from

alarm interface units and/or external computers

emulating the alarm codes. To process alarm

contacts, each port connected to an RS-232 alarm

input device must be set up for Port Use of Alarm.

Alarm Arming and Response

All alarm response actions operate by associating

cameras and monitors with alarm contacts. Monitors

are referred to as “armed” when this association is

made. When a monitor is armed for an alarm contact,

the camera video associated with that alarm contact

is displayed when the alarm is received. Individual

cameras or camera Salvos, each with Preset views

and auxiliary action, can be called automatically to

armed monitors or armed monitor blocks in response

to alarm receipt.

Cameras and monitors must be armed for alarm

response if they are to provide automatic video call-

up to monitors. This includes associating alarm

contacts with both cameras and monitors and

specifying an Arming Code for each monitor.

Three steps are required to arm the system for alarm

response:

1. Associating alarm contacts with cameras

Each alarm contact must be associated with a

camera or a camera Salvo for automatic call-up

when an alarm is received. Each camera or

camera Salvo can be associated with more than

one alarm contact number, allowing multiple views

of a scene to be called up when an alarm occurs.

When camera Salvos are associated with alarm

contact numbers for call-up, monitor blocks

(groups of monitors) must be associated with the

same alarm contact numbers to display the full set

of cameras defined in the Salvo.

2. Associating alarm contacts with monitors

Each alarm contact must be associated with a

monitor or a monitor block for call-up when an

alarm occurs. Each monitor or monitor block can

be associated with more than one alarm contact

number, allowing multiple alarms to be queued

and sequenced on a single monitor or block of

monitors.

When alarm contact numbers are associated with

monitor blocks, they must be associated with the

first monitor of a block only.

3. Arming the Monitors (see

APPENDIX H: Monitor

Arming Methods for detailed information)

Monitors are armed using a monitor arming code

that identifies the following:

• Alarm Display Method (either Single, Block, or

Dual).

• Alarm Queuing Method (either Sequence or

Hold).

• Alarm Clearance Method (either Instant, Auto,

or Manual).

Multiple alarm arming methods may be used to

provide flexible responses to alarms.

Alarm Display Indicators

During the period in which an alarm is active and

being displayed on an armed monitor, the monitor

status line shows the uppercase word “ALARM.” If a

camera Salvo is called in response to an alarm, the

monitor displaying the first camera of the Salvo

shows the word “ALARM” in its status line and

monitors displaying the remaining cameras of the

Salvo show the word “SALVO” in their status lines.

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American Dynamics MegaPower 3200 Installation Guide Page 75

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