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RS-232
Connect RS-232 out to the controlled device such as a projector using the appropriate
RS-232 cable. In "slave mode" you can use the serial port to control the SC-3H, Please
refer to Section 5.0 for more details.
AUX-CTRL
Connect to a Optional SW3-UI (or SW3-UI-VOL) keypad via CATx cabling.
4.3 Factory Default
Hold the 'POWER' and 'INPUT' buttons for more than 4 seconds to reset the unit to the
'FACTORY DEFAULT' state. Factory default can also be set via PC GUI
4.4 Power Connection
A universal 5 Volt DC power supply is provided.
4.5 L/R IN and L/R OUT Connections
NOTE
The L/R IN connection expects a line level signal (maximum of ~0.9 vDC).
If you need an external preamp for low-level microphones, the Hall Research Model
may work for your needs. In most classroom installations, the wireless microphone present
may have a line-level output.
Use the following diagram for connection of external preamp (such as wireless microphone
receiver) to the system.
Ground referenced means that the external preamp has a connection to ground (the AC cord
has a ground prong).
If the preamp does not provide a balanced (differential) output, you should not tie the return of
your source to the ground of the SC-3H. Doing so would create a ground loop that will most
likely cause audio hum.
If you are sure that your external preamp is floating (its AC cord has no ground prong), then it
may be advisable to connect the negative input signal to ground at the SC-3H.
TIP, RING and SLEEVE refer to the L/R IN and L/R OUT 3.5mm connectors
Figure 5 –L/R IN and L/R OUT Wiring Diagram
SC-3H
HR-101-S
7
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