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6
SS 16.4 Installation and Operation Manual
CONTROLS
Controls
Audio Inputs:
Each of the 16 stereo inputs are balanced bridging (20kΩ) at a nominal line level of
+4dBu. Sufficient gain is provided for unbalanced consumer level products.
Multi-turn level controls are provided for each channel. Terminating resistors may
be added to the connector, if needed.
Audio Outputs:
The SS 16.4 provides four selectable balanced stereo outputs. Four balanced mon-
aural outputs are also provided which follow their respective stereo outputs.
“ACT” Audio Activity Sensor:
The SS 16.4 contains individual audio activity sensors, which may be used as silence
sensors for each of the four stereo output channels. For each channel, a detector
monitors the sum of each stereo channel. The factory default time delay and restore
delay is set at 10 seconds, with a fixed signal threshold of -32dB. Upon silence
detection for the user-selected time, the “ACT” indicator is extinguished for the
duration of silence and serial “ACT” status is sent. When audio returns and the
restore time delay has expired, the front panel “ACT” LED will illuminate and seri-
al “ACT” status is sent. The “ACT” may be programmed for:
• Number of seconds of silence that must be present before an alarm state is
reached.
• Number of seconds of audio presence after an alarm state before the “ACT”
LED illuminates.
PIP Input:
The Parallel Input Port (GPI) with the Programmable Pulse Stretcher provides 24
pulse-stretched parallel 5-volt TTL/CMOS compatible inputs. The inputs are pulled
high to 5 volts through a 20kΩ resistor and are activated by pulling the input to
ground for a minimum of 40ms or longer. These inputs supply status to any serial
polling device (when the unit ID is set to 0, no polling of inputs is required). For
all PIP inputs, a pulse of specified minimum input duration (000 to 2.55 Seconds)
causes the status to go true until the end of the input pulse. The pulse width may vary
between the specified value and 10 ms less than that value. This allows the polling
computer more time to detect an input change.
“Open Collector” Status Outputs, 16 Port Output Control
The SS 16.4 provides sixteen open collector status outputs. The status outputs may
be configured to operate in one of three modes:
• The status outputs follow the associated channel.
• The status outputs a one-second pulse when the associated channel is selected.
• Burst mode control
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