External Signal Sense Switch; Pin 3 - 12V (In) Trigger; Pin 4 - Trigger (Loop Out) - AMX ALR-AMP-8 Instruction Manual

External Signal Sense Switch

With the External Signal Sense switch in the ON position (see FIG. 10), the amplifier is automatically turned on when an
audio signal is present, and automatically placed in standby mode when no audio signal has been present on the signal
terminals for approximately 13 minutes.

Note that the example diagram in FIG. 11 indicates the Signal Sense connection tied to the Left output from
the source device, but Signal Sense can come from either output.

The amplifier will power up if a signal is applied to the signal sense input. By default, the External Signal
Switch is set to the ON position.

Pin 3 - 12V (In) Trigger

The Alero can be turned On or placed in Standby mode externally via a 12V Trigger signal. A 12V trigger input is
accessible via Pin 3 on the 10-pin I/O port (FIG. 12).
FIG. 12 PIN 3 Example - 12V Trigger (In) Connections
Typically, Pin 3 connects to a relay pin on a Controller's Relay port. For example, the connection shown in FIG. 12
would allow the Alero to be turned on/off programmatically via Relay #7 on the Controller.

Pin 4 - Trigger (Loop Out)

The Alero also provides a convenient way to daisy-chain a 12V trigger to other devices. Any voltage provided to Pin 3 is
looped out to Pin 4 of the 10-pin I/O port (FIG. 13):
Pin 4 = 12V Trigger (Out)
FIG. 13 PIN 4 Example - Trigger (Loop Out) Connections
Pin 4 connects to a +12V Trigger (input) on a downstream amplifier (see FIG. 12).
ALR-AMP-8 Alero 8 Zone Power Amplifier
Pin 3 = 12V Trigger IN
Pin 5 = GND
Pin 3 = 12V Trigger In
NetLinx Central Controller
ALR-AMP-8
I/O port on first ALR-AMP-8
Pin 10 = Status GND
I/O port on downstream ALR-AMP-8
Pin 10 = Status GND
Installation
11