¥ Brightness Control
The brightness control knob (see Figure 5-2) serves the same function and
operates in the same manner as the 3275/3277 brightness control. This
control also has a test position. When the control knob
is
turned fully clock-
wise
beyond the first stop and held, the screen becomes very bright.
()
Contrast Control
The contrast control knob (see Figure 5-2) serves the same function and
operates in the same manner
as
the 3275/3277 contrast control.
.R Audible Alarm Volume Control
If
your display station has the Audible Alarm feature installed, the volume con-
trol
.B.
for the audible alarm
is
located
at
the outside
of
and behind the
screen contrast control (see Figure 5-2) instead
of
under the machine covers.
Turning this control clockwise increases the sound level; turning the control
counterclockwise decreases the sound level.
Normal/Test Switch
When you are operating the display station, this switch
is
in the Normal
position
(see
Figure 5-2).
You
use
the Test position
of
this switch when you have a problem with the
machine and you perform the problem determination procedures. When you
place the switch in the Test position, you can perform the tests described in
Section 3
of
the 3278 Problem Determination
Guide.
Dual Case/Mono
Case
(A,
a/A)
Switch
The 3278 Display Stations can display
both
uppercase and lowercase
alphabetic characters. You can
use
the
A,
a/A switch (see Figure 5-2)
to
dis-
play (1) only uppercase alphabetic characters or (2)
both
uppercase and
lowercase characters. To select only uppercase characters, set the switch
to
A;
to select uppercase and lowercase characters, set the switch
to
A,
a.
The position
of
this switch does not determine whether uppercase or lower-
case alphabetic symbols are sent
to
the host system. For example,
if
the
switch
is
set
to
A and
you
enter a lowercase e character, an
upp"ercase
E
is
displayed on the screen; however, when the character
is
sent
to
the host
system, the code for a lowercase e character
is
sent.
5-6
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