Specifications

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SS 4.1 MLR Installation and Operation Manual
INSTALLATION
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 Inputs and Output
The SS 4.1 MLR interfaces to external equipment through removable euroblock
screw terminals. The terminals accommodate wire sizes from 16 - 28 AWG solid or
stranded 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
clockwise to secure the conductor.
Input sources that are NOT selected are terminated with a 10K ohm resistor. If you
do not require this load applied to the deselected sources, they may be removed from
each channel. Each channel has a pair of resistors. Removal information: Channel
1 = R8 & R9. Channel 2 = R10 & R11. Channel 3, R12 & R13 and Channel 4 =
R14 & R15. If the SS 4.1 MLR is to be used for applications other than switching
audio, the Silence Sensor and ACT detection circuit should be disabled. To disable,
remove RP6 from its socket.
PIP (GPI)/Remote Control Inputs
The SS 4.1 MLR has eight status inputs that may be configured for PIP (“triggers”)
or remote control operation and accept momentary contact closures (sustained, if
break before make); open collector or TTL/CMOS input logic levels. In addition to
the PIP/remote control inputs located on TB4, the silence sense tally SPST relay
contacts are also present, labeled SS-NO (normally open) and SS-CM (common.)
(Top Row, TB4)
(Bottom Row, TB4)
The operation mode is set by the SW6-7 Dip-switch, when SW6-7 is OFF the unit
is in remote control mode and when SW6-7 in ON the unit is in PIP mode. The
PIP/remote control connections to the switcher are found on the top and bottom
rows of the connector TB4. Each channel may be selected by a momentary contact
to ground. Each channel is pulled high (5-volts) through a 22K resistor.
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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)
PIP4
IN-4
PIP5
MUTE
PIP6
STEP
PIP7 PIP8
EAS
DGND
SS-NO SS-CM PIP1
IN-1
PIP2
IN-2
PIP3
IN-3
DGND