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6
ACS 4.1 Installation and Operation Manual
INSTALLATION
Silence Sensor
The ACS 4.1’s output has a built-in silence detector that monitors the sum of the
stereo channel. The factory default delay is set at 10 seconds, with a threshold of -
30 dB, while the restore time is set at 2 seconds. Upon silence detection the “OCSS”
open collector output and the SS LED will activate for the duration of the silence.
Serial data is also sent on the loss and restoration of audio.
The sensor may be programmed for:
• Silence sense threshold. The audio level below which is consider silence. This
may be set to -20 dBu, -25 dBu, -30 dBu or -35 dBu.
• Number of seconds of silence that must be present before an alarm state is
reached (Acquire delay.)
• Number of seconds that valid audio must be present before an alarm state is
cleared (Restore delay).
LED indicators
• “PWR/HB” LED: Illuminates when power is applied and blinks when serial data
is active.
• “PIP” LED: Flashes to indicate PIP activity.
• “SS”: Silence Sensor indicator LED, lit when silence is detected. The silence sen-
sor must be enabled for this to function.
• “ACT” LED: Real-time output audio activity indicator, lit when output audio is
above threshold.
Power
Connect the 3-pin AMP-style latching power connector to the unit and the +/-15
VDC switching power supply with domestic connector into a 120 Vac 50-60 Hz
power source. Never use any type of power supply other than the specified/supplied
power supply.
I/O Connections
The rear panel contains all the inputs, outputs and remote control interfacing con-
nectors. The multi-drop serial port is equipped with a modular RJ-11 jack.
Audio Connections
The ACS 4.1 interfaces to external equipment through removable euroblock screw
terminals. The terminals accommodate wire sizes from 16 - 28 AWG solid or strand-
ed wire. Before installing a wire, remove the euroblock screw terminal plug and turn
each capture screw fully counterclockwise. Strip each conductor to a length of 0.25”
and insert the conductor fully into the terminal. Turn the capture screw fully clock-
wise to secure the conductor.
CAUTION:
In no case should either the + or - outputs be connected to ground. The
input impedance is 20KΩ, 600Ω terminations may be installed on the connector.
Input 1
(Top row, TB1)
2L-
2L+ Gnd
2R-
2R+
1L-
1L+ Gnd
1R-
1R+
Input 2
(Bottom row, TB1)
Input 4
(Top row, TB2)
4L-
4L+ Gnd
4R-
4R+
3L-
3L+ Gnd
3R-
3R+
Input 3
(Bottom row, TB2)
Output
(Top row, TB3)
OL-
OL+ Gnd
OR-
OR+
See Open Collector Outputs
(Bottom Row, TB3)
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