Instruction manual

OPERATION
/ Clear-Com
CS-222
2-Channel
Main Station
9.
Earphone
Jack
The
jack
marked
"Earphone"
provides
an output
intended
to drive
an
extra
earphone.
This
output
is capable
of driving
an 8 ohm
headphone
or
loudspeaker.
10.
Link
Switch
The
switch
marked
"Link"
on the
right
side
of the
unit allows
the operator
to "combine"
channels
A and
B
so that
all stations
can talk
to each
other.
(Normally
channels
A and
B
are totally
isolated
and
stations
on
one channel
cannot
talk
to stations
on the
other
channel.)
When
in the
"A+B
Link"
operating
mode,
only
the channel
A controls
operate.
The
channel
B
controls
have
no
effect.
NOTE:
When
the switch
is in the
"A+B"
position
the channels
do not
actually
'combine'.
What
really
happens
is the
three
B channel
connectors
are simply
internally
disconnected
from
the
B circuitry
and
connected
to
the
A channel
circuitry,
putting
all stations
on the
channel
A
party-line.
This
maintains
all
the correct
line
and
station
terminations.
CAUTION:
The
LINK function
will
work
properly
at the
main
station
that
is providing
the
"line
terminations"
for
the
system.
If there
is more
than
one
Main
Station
in the
system
equipped
with
a "LINK"
switch,
DO NOT
ATTEMPT
TO
USE
THE
LINK
SWITCH
ON
THE
STATIONS
THAT
ARE
NOT
PROVIDING
THE
LINE
TERMINATION.
Both
double
line termination
and
station
un-termination
will
result,
causing
significant
sidetone
mis-adjustments
and possible
feedback
and oscillation.
11.
Program
Monitor
Control
The
"Program
Monitorm
volume
control
sets
the amount
of the
program
signal
heard
directly
in
the headphone.
This control
only affects
what
is heard
in
the headphone
and
does
not affect
"Program"
feed
to
the intercom
lines.
12. Stage
Announce
Button
The
"Stage
Announce"
(SA)
button
allows
the
operator
to instantly
use
the
microphone
input
to
directly
talk
to a system
external
to
the intercom
such
as a paging
speaker/amplifier
in another
room.
A dry
set
of relay
contacts
on the
rear
panel
is
also
available
that can
be
used
to activate
external
switching
as needed
when
the
"SA"
button
is pressed.
Pressing
the SA
button
momentarily
disables
any
active
"Talks".
Active
"Talk'
circuits
will
be restored
when
the
button
is released.
The
"Talk"
muting
action
can
be
defeated
if desired
by
moving
an
internal
jumper.
(see
section
on internal
options
and
adjustments)
11/90
Rev.
1.0
Page
19