Carrier Access 770-0125-AB installation manual Alarm Input Sensing, Pin Name

Installation

Cabling the Alarm Ports

!Alarm generation #1 and #2 (alarm outputs)—These are used to generate an alarm from the BROADway chassis to an external unit, such as an alarm siren, aisle alarm lights, alarm telemetry systems, and so forth.

The ALARMS port is a female DB15 port. The following table describes the pinout of the ALARMS port. The contacts closures for alarm output ports are in the normal state when no alarm is present in the system.

Pin	Name
1	normally open	alarm generation #1
		(interpreted as a Critical/Major alarm)
2	common
3	normally closed
4	normally open	alarm generation #2
		(interpreted as a Minor alarm)
5	common
6	normally closed
7, 8	not used
9	ALMSNS2N	alarm sense #2
		(can be configured for Critical, Major, or MInor)
10	ALMSNS2P
11	ALMSNS1N	alarm sense #1
		(can be configured for Critical, Major, or MInor)
12	ALMSNS1P
13	Ground
14	not used
15	+5V DC reference voltage

Using the ALARMS port, you can do either or both:

!Connect none, one, or two external sources to alarm sense #1 and #2 to indicate when an alarm is coming from the external source.

!Connect none, one, or two external units to the alarm generation #1 and #2 to tell the external units when an alarm has occurred on the BROADway system.

Alarm Input Sensing

The ALARMS port provides two separate circuits to detect when an alarm is generated from an external source. The circuit will sense an alarm condition when an external +5V potential is placed across pins 11 and 12 (ALMSNS1) or pins 9 and 10 (ALMSNS2). These pins are isolated from the BROADway chassis. If an external voltage is not readily available, a 5V reference and ground are supplied on pins 13 and 15 and can be looped back onto pins 9 and 10 or 11 and 12, respectively, using the relay contacts.

2-12 BROADway - Release 4.00