Manual

Issue 2, December 2018 Model 391 User Guide
Page 16 Studio Technologies, Inc.
A configuration choice within STcontroller
allows disabling access to operating
Mode 2. If this feature is enabled and the
pushbutton switch is pressed and held the
Mode 1 LED will remain lit while the Mode 2
LED will quickly flash four times to indicate
that access to it has been disabled.
Visual Alert
As expected, the action of the Visual Alert
section will follow the configuration choices
made for the operating mode that has been
selected. There are many different operat-
ing choices, such as color, intensity, and
on/off action, that should work together to
provide optimal performance in many dif-
ferent applications. What’s presented to the
user will be just a subset of all the choices
that are available.
A unique set of visual alert actions will
occur if the Call Source has been selected
to be Channel 1 & 2. If a call signal is de-
tected on audio input channel 1 the visual
alert will light with the configured color
choice. If a call signal is detected on audio
input channel 2 the visual alert will light
with a color that’s different from the config-
ured color. (That color will be determined
by a fixed math formula.) If call signals are
simultaneously detected on both audio
input channels 1 and 2 then the configured
color will be displayed. This effectively
makes a call signal on input channel 1
have priority over a call signal on input
channel 2.
Audio Alert
The Audio Alert section consists of three
items on the front panel. A small rectangu-
lar hole is used by the audio sounder as
the exit point for the alert audio. A green
LED displays the status of the audio alert
function. And a rotary “trim” potentiometer
(pot) is provided for the user to adjust the
level of the audio sounder. The status LED
provides a number of indications which
are important to understand. The LED
will not be lit if the active operating mode
is configured such that the status of the
audio alert is turned off. Should a call sig-
nal be received by the Model 391 the LED
will remain off; adjusting the trim pot will
not result in any operating change.
If the status is configured for Low Range
or High Range the user can use the trim
pot to adjust the output level of the audio
sounder. If the trim pot is not set to its fully
counterclockwise position, the status LED
will be lit steadily. This indicates that the
audio sounder is “ready” to be activated
by a call signal. If the status of the audio
alert function is configured for Low Range
or High Range and the trim pot is set to
its fully counterclockwise position the
status LED will flash. This condition is
provided to inform the user that although
the configuration is selected for the audio
sounder to be active the trim pot is set
such that no audio will be generated. Set-
ting the trim pot to its fully counterclock-
wise position is certainly a valid means
of turning off the audio sounder and the
flashing LED will highlight this condition.
If the audio alert status LED is either lit or
flashing, it will change to a fast-flash ca-
dence whenever a call signal is received.
This helps to identify when the audio alert
function is receiving a call signal request
and, depending on the setting of the trim
pot, the sounder may be generating an
audio output.