SMC Networks SMC TigerAccess SMC7824M/ESW - Manual (Page 55)

C
ONNECTING TO THE
A
LARM
P
ORT
3-17
The following figure shows the pinout information for the DB-15
ALARM connector on the front panel.
Figure 3-11 External Alarm I/O Connections
1
11
6
2
12
7
9
10
3
4
NC
NO
COM
Major Alarm
NC
NO
COM
Minor Alarm
External Alarm Input 1
External Alarm Input 2
External Alarm Input 3
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 Connector
External Alarm Input 4
ALARM_IN1_EXT_P
ALARM_IN1_EXT_RTN
Alarm input is isolated by photo-coupler.