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6
SS 2.1 MLR/BNC Installation and Operation Manual
INSTALLATION
CAUTION!
Installation of the SS 2.1
MLR/BNC in high RF
environments should be
performed with care.
The station ground
should be connected to
the designated chassis
ground terminal using a
20 to 24-gauge wire.
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I/O and Remote Control Connectors
The rear panel contains BNC connectors for I/O and removable screw terminals for
remote control interfacing with mating connectors. The multi-drop serial port is
equipped with a modular RJ-11 jack.
Remote Control Wiring
The SS 2.1 MLR/BNC 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 con-
ductor to a length of 0.25” and insert the conductor fully into the terminal. Turn the
capture screw fully clockwise to secure the conductor.
Remote Control
The remote control connection to the switcher is via the bottom row of the connec-
tor TB4. Each channel may be selected by a momentary or sustained (depending on
the configuration) contact to ground. Each channel is pulled high (5-volts) through
a 22K resistor.
Relays
SPDT relay contacts are available on the top row of the remote control connector
TB4. K3 is associated with input channel one, while K4 is associated with input
channel two.
Note: K5 is not installed on the BNC version.
Note: For wiring information, refer to the grid below, silk-screen text on the
rear panel of the product or the fractional schematic(s) in the appendix.
Relay Outputs (Top Row, TB 4)
K3 N.O.
K3 Common
K3 N.C.
K4 N.O.
K4 Common
K4 N.C.
SW-1
SW-2
SW-3 (Mute)
GND
N/A
N/A
Control Inputs (Bottom Row, TB 4)
Configuration Jumpers
JP2:
Not used on the BNC version
JP3:
Disabled
= Front panel enable switch defeated.
Enabled
= Front panel ENABLE push button active.
The enable LED is illuminated.
NOTE: This push button must be held closed to operate any of the other front
panel push buttons and isn’t associated with any of the remote control functions.
JP4:
Bypass
= Bypasses R14, 75 ohm resistor. BNC output connector J3.
Enabled
= Inserts R14, 75 ohm resistor.
JP5:
Bypass
= Bypasses R15, 75 ohm resistor. BNC output connector J4.
Enabled
= Inserts R15, 75 ohm resistor.