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Issue 2, September 2007 Model 46 User Guide
Page 16 Studio Technologies, Inc.
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Earth/Ground (E) Green/Yellow
Safety Warning: The Model 46 does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection de-
vice. Safety considerations require that
the plug and associated inlet be easily
accessible to allow rapid disconnec-
tion of AC mains power should it prove
necessary.
As soon as AC mains power is applied
the Model 46 will begin its power-up
sequence. As a “boot up” indication the
power LED and each of the status LEDs
will momentarily light. After the sequence
has completed the power LED will again
light and remain lit. The unit is now fully
functional.
Configuration
For the Model 46 to support the needs of
specific applications a number of operat-
ing parameters must be configured. These
include the 2-wire party-line power source,
the nominal 2-wire level, and the nominal
4-wire level. Three 4-position DIP-type
switch assemblies are used to establish
the desired configuration. One DIP switch
assembly is associated with interface 1, a
second is associated with interface 2, and
a third associated with advanced operat-
ing features that apply to both interfaces.
Configuration – Interface 1
and 2
The DIP switch assemblies associated with
interface 1 and 2 are accessible on the
Model 46’s front panel. They provide identi-
cal capability for their respective interfaces.
Refer to Figure 6 for a detailed view. In this
section the four switches associated with
interface 1 will be covered in detail. This
information applies to interface 2 as well.
The four switches allow selection of the
2-wire party-line power source, the nominal
level for the 2-wire party-line channels, and
the nominal level of the 4-wire inputs and
outputs.
Figure 6. Detail of front panel showing four DIP
switches
2-Wire Party-Line Power Source
DIP switch 1 is used to select whether or
not the Model 46 provides DC power to
pin 2 of connectors associated with the
2-wire party-line intercom channels. Two
3-pin male XLR-type connectors, one
located on the Model 46’s front panel
and one on the back panel, are used to
interconnect the Model 46 with the inter-
com user devices. When switch 1 is in its
off (down) position the Model 46 will not
provide DC power. This switch setting is
appropriate when an external intercom