The SR2 has three on-board relay outputs which can be used to send alarm notification to a beacon or via an auto-dialler (or other 3rd party device).

•These are connected via JP2, as follows:

Pin

Connection

Description

1

Relay 1 N/O

This relay closes and a nominal 12V appears on Pin 1 in the event of any alarm on the any of the assigned Zones. It is fused via F1. This is suitable for driving alarm beacons.

2

Relay 1 GND

3

Relay 2 Common

This is a changeover relay responding to alarms in the software.

When no alarms exist, pins 3 + 5 are connected.

When an alarm exists, pins 3 + 4 are connected.

4

Relay 2 NC

5

Relay 2 NO

6

Relay 2 Common

This is a changeover relay indicating the mains power state of the SR2.

When power is present pins 6 + 8 are connected.

When power fails pins 6 + 7 are connected.

7

Relay 2 NC

8

Relay 2 NO