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External alarm port – Reliant Octel 200 and Octel 300 Message Servers PB6001401 User Manual

Page 152

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4-34

Installation and Maintenance Volume

Octel Overture 200/300 Serenade 3.0

PB60014–01

External Alarm Port

The external alarm port uses a 9-pin DB9 female connector with the following pin arrangement:

. . . . .

. . . .

1

5

6

9

Front View DB9 Male Connector

-

Use connector J3 for the Octel Overture 200.

-

Use connector J5 for the Octel Overture 300.

The external-alarm connector pin assignments are as follows:

AJ1 and AJ2 Connector Pin Assignments

Pin Number

Signal Function

1

Relay A, Pin 1

2

Relay B, Pin 1

3

LINK

4

GND

5

GND

6

Relay A, Pin 2

7

Relay B, Pin 2

8

LINK

9

GND

Relay A is the major alarm relay. Relay B is the minor alarm relay. A relay is open when there is no
alarm. When a relay is closed, it indicates an alarm condition.

With power removed from the cabinet, both Relay A and Relay B are in the closed position (normally
closed), indicating an alarm condition.

Pins 3 and 8 are linked together to provide a loop. You can use this as a confirmation that an alarm cable
is installed. Pins 4, 5, and 9 are connected to cabinet ground. These pins can be jumpered to a relay
contact, if closure to ground is required.

Both Relay A and Relay B are rated at

-

48 Vdc maximum

-

0.5 A maximum

The link loop is rated at

-

12 Vdc maximum

-

200 mA maximum