Nexus 21 NX2 - Manual (Page 12)

SERVER
buzzer will sound as soon as any alarm function is activated in the
Nexus Network.
Red wire to Server pin 9 (+ 12V ). Or 12V from switch panel
Black wire to Server pin 14 (BUZZER).
2.4.4 NX2 instruments
All NX2 instruments are connected directly to the Nexus Network
in a daisy chain. They all use the same colour coded 4-pole jack
plugs. (For instrument installation, see instrument manual).
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