User Guide
Model 374A User Guide Issue 4, February 2021
Studio Technologies, Inc. Page 13
MODEL 374A
INTERCOM BELTPACK
When button 4 has been selected to the
Call mode it will serve as a call enable
button for talk channels 1, 2, and 3; micro-
phone audio will never be sent out Dante
transmitter channel 4. In the Call mode but-
ton 4 will operate in a push-to-activate man-
ner and whenever it is active and channels
1, 2, and/or 3 are active a 20 kHz
tone (call signal) will be added to the
active audio paths. It will not display a
call signal that’s present on audio input
channel 4.
System – Mic Kill
Choices are Off, Device ID, Global Kill
Command, and Device ID/Global Kill
Command.
The mic kill function allows an enabled
talk channel to be disabled by remote
control. Specifically, it’s possible to re-
motely change all active (on) talk channels
to their off state. This function is sometimes
referred to as a “talk off” function. There are
two means available to remotely disable all
active talk channels. The Device ID method
uses the identification command gener-
ated by the Dante Controller or STcontroller
applications as a “trigger” to disable any
active talk channels. The Global Kill Com-
mand can be generated by applications
that incorporate the Studio Technologies’
proprietary method. This method utilizes
sending a data command over the Ether-
net connection. Select the desired mic kill
configuration from the four choices. Off
simply means that no remote talk control is
supported.
System – Call Indication
Choices are Off, Flash, Solid, and Flash
then Solid.
The call indication configuration allows the
manner in which each of the four talkback
button LEDs will light when a call signal is
detected on its respective Dante receiver
(input) channel. Technically, call is detected
as active when a 20 kHz nominal audio
tone is present in an audio signal path.
(It would typically be a sine- or square-
wave signal that’s combined with voice
audio.) If Off is selected and a call signal
is detected in a Dante receiver (input)
channel then the associated button’s LED
will not light. If Flash is selected then a but-
ton’s LED will flash orange if a call signal is
detected and the channel’s talk function is
not active. If the channel’s talk function is
active when a call signal is detected then
the button’s LED will flash alternately green
and orange. (Green indicates that the talk
function is active and orange indicates that
a call signal is detected.) If the configura-
tion is selected for Solid then a button’s
LED will light orange when a call signal is
detected; it will light orange whether or not
the talk function associated with that but-
ton is active. If call indication is configured
for Flash then Solid and a call signal is
detected, then a button’s LED will first flash
orange (or green and orange) and then will
light solid orange, remaining lit orange until
the call signal is no longer present.
Operation
At this point everything should be ready
and Model 374A operation can commence.
An Ethernet connection with Power-over-
Ethernet (PoE) capability should have been
made. A headset terminated on a 5-pin
male XLR connector should be plugged
into the headset connector.
Using the Studio Technologies’ STcontroller
software application the unit’s configura-
tion should have been selected to meet
the needs of the specific application. The