User Guide
Issue 4, February 2021 Model 374A User Guide
Page 22 Studio Technologies, Inc.
MODEL 374A
INTERCOM BELTPACK
(embedded software) that resides in the
Ultimo “chip.” The STcontroller software
application can also be used to identify
the Ultimo’s firmware version. (Use the
Version selection under the Device tab.)
The Ultimo firmware can be updated by
way of the Model 374A’s Ethernet connec-
tion. The latest Ultimo firmware file is avail-
able on the Studio Technologies’ website.
The Dante Firmware Update Manager
(FUM) application program can be used
to install the Ultimo firmware. The Dante
Controller software application includes
an automated method of updating Ultimo
firmware. It offers a much simpler method
of keeping the Ultimo firmware current.
Model 374A versus Model 374
Some users may be interested in the dif-
ferences between the original Model 374
Intercom Beltpack and the newer Model
374A that is described in this guide. A
comparison chart is available on the Stu-
dio Technologies’ website. In addition, the
following text provides a summary of the
changes:
• All configuration selections for the
Model 374A are performed using the
STcontroller software application.
STcontroller also allows the version
numbers of the Model 374A’s applica-
tion and Ultimo firmware (embedded
software) to be remotely identified.
• Support for electret microphones was
added to the Model 374A. This in-
volved incorporating a 5 volt DC power
source that is associated with the
microphone input pin. It can be en-
abled or disabled as required using
STcontroller.
• The configurable microphone input
gain settings were modified to be com-
patible with the increased output level
supplied by electret microphones.
• The DIP switch assembly and the min-
iature pushbutton switch found on the
Model 374 are not present on the Mod-
el 374A. As such the belt clip no longer
needs to be rotated and its mounting
arrangement has been changed.
• The user-accessible sidetone trim
potentiometer found on the Model 374
is not present on the Model 374A. In
the Model 374A the level of the side-
tone function is configured using
STcontroller.
• The Model 374A offers a second meth-
od of activating the mic kill function.
This allows a data signal, in additional
to the Device ID command, to activate
mic kill.
• The STcontroller software application
now offers the ability to configure the
mic kill function, including allowing it
to be disabled.
• The Model 374A allows button 4 to be
used as a call button function.
Belt Clip
The belt clip is attached to the back of the
Model 374A’s enclosure by way of two
6-32 thread, Philips-head machine screws.
Unlike other the original Model 374 Inter-
com Beltpack units, the belt clip on the
Model 374A will never have to be rotated
as part of the configuration process.
(There are no configuration DIP switches
or a pushbutton switch under the belt
clip.) But if the belt clip does need to be
replaced a #1 Philips-head screw driver
would be the correct tool to remove the
machine screws.