Manual

Issue 3, March 2016 Model 45DC User Guide
Page 12 Studio Technologies, Inc.
sources each have a maximum current of
150 mA. This modest amount of power can
be very useful but requires that the type
and number of connected user devices be
selected appropriately. Many entertainment
applications use the legacy Clear-Com
RS-501 beltpack and each Model 45DC
intercom circuit can directly support up to
three of them. With the newer and more
energy efficient Clear-Com RS-701 it should
be possible to connect up to five of them.
Wiring from the Model 45DC intercom
interface’s 3-pin male XLR connectors
to the user devices requires that a 1-to-1,
2-to-2, 3-to-3 wiring scheme on the mating
3-pin XLR connectors be maintained.
Compatibility with 2-Channel
Intercom Systems
As previously discussed in this guide, the
Model 45DC is designed to support single-
channel party-line intercom circuits and
user devices. It’s possible that applications
that involve 2-channel party-line intercom
circuits and user devices (typically associ-
ated with the RTS TW-series of products)
can also be supported. These circuits and
devices typically utilize common on pin 1,
28 to 32 volts DC and channel 1 audio on
pin 2, and channel 2 audio on pin 3. When
connected to a Model 45DC only channel
2 will be active; channel 1 would not be
utilized. A better means to support these
2-channel circuits and devices is to use the
Studio Technologies Model 45DR Interface.
This unit, the “cousin” of the Model 45DC,
is optimized for 2-channel party-line inter-
com applications. Rather than providing
two single-channel interfaces the Model
45DR provides one 2-channel interface.
Detailed information about the Model 45DR
is available on the Studio Technologies
website (www.studio-tech.com).
Configuration
Back-Panel DIP Switches
A 4-position DIP switch assembly, labeled
Configuration, is located on the Model
45DC’s back panel. Switch SW1 allows
the Model 45DC’s call light support func-
tion to be disabled. Switch SW2 allows the
party-line active detection function to be
disabled. Switches SW3-4 are not current-
ly utilized and have no impact on Model
45DC operation.
Call Light Support
Switch SW1 allows the call light support
function to be disabled. When switch SW1
is in its off (down) position the call light
support function is enabled. When SW1
is in its on (up) position the function is
disabled. For most applications the call
light support function should remain en-
abled. Only special circumstances would
merit disabling the function. Note that the
call light function between user devices
connected to the same Model 45DC inter-
face will always be active. Disabling the
Model 45DC’s call light support function
only impacts the call function that’s sent
and received by way of the Dante audio
connections.
Figure 3. Call light support configuration switch