Studio Technologies 212 2013 - Manual (Page 10)

Issue 5, May 2013 Model 212 User Guide
Page 10 Studio Technologies, Inc.
(DPDT) contacts. Under software control,
the relay can be configured to follow the
state of the main and talkback audio chan-
nels. Taking advantage of the back-panel
locations provided for additional XLR
connectors, a technician may easily imple-
ment a variety of functions such as pro-
viding an “on-air” indicator or performing
loudspeaker muting during talkback.
Configuration
Model 212 configurations are made using
a number of DIP switches. One 8-position
switch assembly is used to set the gain
of the microphone preamplifier, the on/off
status of phantom power, the compressor
threshold, and the headphone stereo/
mono mode. Another 8-position switch
assembly configures which of the audio
sources is routed to the headphone out-
put. A 12-position switch assembly com-
municates the desired operating modes
to the microprocessor. All switches are
accessible via the bottom of the Model
212’s enclosure; the unit does not have to
be disassembled. Changes made to any
of the configuration parameters become
active immediately. To prevent access to
the configuration switches a security plate
included with each unit, is attached to the
bottom of the enclosure.
Connectors
The Model 212 uses standard connec-
tors throughout. The microphone input
uses a 3-pin female XLR connector. The
digital audio inputs and outputs use BNC
connectors. A ¼-inch 3-conductor jack is
used for the headphone output. The ex-
ternal source of 24 volt DC power is con-
nected by way of a 2.1 x 5.5 mm “locking”
coaxial power jack.
In the world of broadcast and production
audio it’s fair to say that applications vary
widely. To this end, one or two additional
XLR connectors can easily be mounted
into the Model 212’s back panel. Multiple
3-position “headers” located on the Model
212’s circuit board provide technician-
access to all input and output connections.
Using a factory-available interface cable
kit allows a Model 212 to be optimized to
meet the exact needs of specific applica-
tions. For example, some applications may
prefer to use a multi-pin XLR connector to
interface with a headset. This can easily be
accomplished by adding the appropriate
5-, 6-, or 7-pin XLR connector and making
a few simple connections. Other applica-
tions may benefit from having “mult” or
“loop-through” connections, something
easily incorporated into a Model 212. One
or two optional line input cards, as previ-
ously discussed, can also be mounted in
the spare XLR positions. Line output cards
are available to support the analog line-
level main and talkback outputs.
Installation and
Setup
In this section interconnections will be
made using the input and output con-
nectors located on the Model 212’s back
panel. A microphone signal is interfaced
by way of a 3-pin XLR connector. A ¼-inch
3-conductor phone jack is provided for
the headphone output. Digital audio input
and output connections are made using
BNC jacks. A 2.1 x 5.5 mm coaxial jack al-
lows connection of the external 24 volt DC
power source. Depending on the installed
options, other connectors may also be
used to connect analog, digital and power
signals.