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| Installing the Switch
C
2
HAPTER
Connecting to the Alarm Port
The following figure shows the pinout information for the DB-15 ALARM
connector on the front panel.
Figure 15: External Alarm I/O Connections
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
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.
– 48 –
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