SMC Networks SMC7824M/ESW manual External Alarm I/O Connections

CONNECTING TO THE ALARM PORT

The following figure shows the pinout information for the DB-15 ALARM connector on the front panel.

Alarm Connector

1

11

6

2

12

7

9

10

3

4

NC

COM

NO Major Alarm

NC

		COM
		Minor Alarm
	NO
External Alarm Input 1		To backplane via internal signal
External Alarm Input 2
		converter circuits.
External Alarm Input 3		External input uses dry relay contact
		to pins 14, 15, 13 and 8 for grounding.
External Alarm Input 4
		For active alarm, the relay is closed.

ALARM_IN1_EXT_P

ALARM_IN1_EXT_RTN

Alarm input is isolated by photo-coupler.

Figure 3-11 External Alarm I/O Connections

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