Figure 3-11 External Alarm I/O Connections - SMC Networks SMC TigerAccess SMC7824M/ESW Installation Manual

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
External Alarm Input 1
9
External Alarm Input 2
10
External Alarm Input 3
3
External Alarm Input 4
4
ALARM_IN1_EXT_P
ALARM_IN1_EXT_RTN

Figure 3-11 External Alarm I/O Connections

C
ONNECTING TO THE
NC
COM
Major Alarm
NO
NC
COM
Minor Alarm
NO
To backplane via internal signal
converter circuits.
External input uses dry relay contact
to pins 14, 15, 13 and 8 for grounding.
For active alarm, the relay is closed.
Alarm input is isolated by photo-coupler.
A P
LARM ORT
3-17