Specifications

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11
SS 4x4 Installation and Operation Manual
INSTALLATION
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Adjusting Input and Output Levels
Once the input and output connections have been made, the input levels can be set.
The switcher is factory set for unity, but has about 10 dB of system gain.
Recommended input levels would be in the range of -6 dBu to +10 dBu. Should
input levels need to be changed, they are accessible from the rear panel. Each stereo
input and output is labeled and have two trimmers per stereo channel.
Input Channel Expansion
Input expansion may be accomplished by connecting a shielded cable between the
first units EXT 1+ input terminal and the second units unbalanced output. The
shield should be connected to the ground terminal. Follow the same procedure for
the EXT +1 right channel. The above example provides 8 inputs, with the first
switcher providing the main output.
Connecting the RS-232 Serial Port
The multi-drop RS-232 transceiver always switches between transmit and receive
mode, unless the unit ID is zero. In that case, the unit will always leave the RS-232
transceiver enabled. Use the provided modular (S9) 9-pin D-sub connector adapter
and reversed modular cord to connect the SS 4.4’s serial connector to your serial port.
Modular Jack Pin Numbers
The pin out of the adapter is shown below
The SS 4.4 is supplied with a X-over modular cable and a (S9) 9-pin female D-sub
modular adapter for serial control. Only use the modular cord that is supplied with
the SS 4.4 or a replacement that reverses (X-over), such as Radio Shack Cat No.
279-0347. Connect the cable between the SS 4.4 and your computers COM port or
USB adapter cable (optional). The SS 4.4 may be serially controlled at baud rates
of 9600 or 38400 baud. The unit is shipped set for 9600 baud, with 8 data bits, no
parity and one stop bit. Load Windows “HyperTerminal” using the protocol of
9600-N-8-1. Set the mode to: DIRECT, Flow Control to: NONE and emulation to:
ANSI. HyperTerminal set up instructions are available on our web site under
“Downloads”.
RJ-11
Adapter
Pin
DB-9
D-Sub
SS 8.2
(Point of view)
4 3 RS-232 Receive
3 2 RS-232 Transmit
2 5 Ground
Modular Jack
Pin Numbers