Installation manual

Wiring the NSO | 41
External alarm
An external alarm can be connected to one or more NSO processors on the network. The
external alarm can be a small peizo buzzer connected directly or a horn siren connected
via a relay.
The external alarm output is the dark green wire on the Utility cable. This pulls to ground
to sound the alarm. If the current drawn by the external alarms is more than 250 mA, fit
a relay.
Alarms are configured globally in the system i.e they can be configured on one display
and be seen, heard and acknowledged from all displays. How ever the external alarm
siren can be enabled or disabled on individual displays. For information on configuring
alarms refer to the Alarms section in the operation manual
UTILITY
Dark green: External alarm
12 - 24 V DC
+
_
250 mA max
35 V DC max
For sirens that draw more than 250 mA use a relay
UTILITY
Dark green: External alarm
+
_
MENU
9
WIN
x2