Page 3 of 7 SLX Series
ANALOG AUDIO CONFIGURATIONS
:
The source and destination audio devices must be evaluated to determine if they utilize balanced or unbalanced
outputs and inputs. After determination is made, refer to the drawings provided to select the proper audio wiring. All
inputs should be the same configuration. If both balanced and unbalanced inputs are used, gain variations will occur
as noted below. In those applications, the audio signal levels should be adjusted before connection to the switcher.
Balanced In to Balanced Out
Balanced In to Unbalanced Out
V out = V in
V out = 0.5 V in
Unbalanced In to Balanced Out
Unbalanced In to Unbalanced Out
(-) Input Grounded; V out = V in
V out = 0.5 V in
(-) Input Floating: V out = 0.75 V in
The input to output level comparison provided in the figures above, assumes the outputs are terminated into a
600
Ω
load.
CONTROL:
External control of the SLX Series may be performed by a Remote Control Panel or another serial control system.
This is accomplished via the 9 Pin D connector on the rear of the SCI-161 module, located in the left rear position of
the master frame. The SCI accepts either RS-232 or RS-422 format control signals from external devices. Details on
the interface parameters and format selection are covered in the SLX Series Control Protocol section of this manual.
Systems comprised of multiple frames require the control information to be looped from the master frame to each
slave frame. The 9 Pin D connector located on the power supply module is used for the purpose of looping the control
information.
**NOTE**
Due to a change in system processor, the communication parameters Bits/Character, and Parity, are no longer
available. Default settings are now 8 Bits/Character and No Parity. To determine whether a system has this change,
enter the command “V”, for version, when the system is in a working communications mode. Systems with the new
processor will respond with “Sigma Electronics Copyright 2002, SCI-162 firmware version X.XX {Month Day Year}”.
Earlier systems that have the Bits/Character, and Parity parameters set by the user will respond to the “V” command
with “?”.
+
C
-
IN OUT
+
C
-
+
C
-
+
C
-
IN
+
C
-
OUT
+
C
-
+
C
-
+
C
Open
+
Gnd
IN OUT
+
C
-
+
C
-
+
C
-
+
Gnd
IN OUT
+
C
-
+
C
-
+
C
Open
