Specifications

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6
SS 4x4 Installation and Operation Manual
DESCRIPTION
Controls
Front panel powered monitor level control.
Front panel headphone level control.
Audio Inputs
Each of the four stereo inputs are balanced bridging (20KΩ) at a nominal line level
of +4dBu. Ample system gain is provided to accommodate most unbalanced con-
sumer level products. Multi-turn level trimmers are provided for each channel.
Audio Outputs
The SS 4.4 provides four balanced low impedance stereo outputs. The outputs may
be adjusted with the multi-turn trimmers.
Silence Sensor
The SS 4.4 contains a silence sensor for stereo output one. A detector monitors the
sum of stereo output one. The factory default delay is set at 10 seconds, with a
threshold of -25 dB, while the restore time is set at two seconds. Upon silence delay
detection, the “SS” led will illuminate and the SPDT SS relay will close for the dura-
tion of the silence. The sensor may be programmed for:
• Number of seconds of silence that must be present before an alarm state is
reached or terminated.
• Number of seconds that valid audio must be present before an alarm state is
cleared.
PIP (Trigger) Inputs
The 16 input “PIP” (GPI/Triggers) are used to monitor closures and pass that infor-
mation back to the control computer. Response time is set for 50ms, but may be con-
figured from 40ms to 2.54 seconds. The inputs are pulled high (5 volts through a
20KΩ resistor) and activated by forcing the input to ground. These inputs supply
status to any serial polling device (when the unit ID is set to 0 (ZERO), no polling
of inputs is required).
“Open Collector” Status Outputs, 4 Port Output Control
The SS 4.4 provides four 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.
Software control
Relay Outputs, 4 Port Output Control
The SS 4.4 contains four SPDT relays. Each relay may be latched on, latched off or
momentarily turned on by an attached control computer. The “pulse” time may be
set from 100 msec to 9.9 seconds. The default pulse length is one-second. The
relays may be set for “MPX” mode. In the “MPX” multiplex mode, the relay fol-
lows the associated input channel assigned to output two.
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