Clear-Com MS-222 User Manual

OPERATION
/ Clear-Com
MS-222
2-Channel
Main
Station
12. 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.
13.
Program
Monitor
Control
The
"Program
Monitor"
volume
control
sets
the
amount
of the
program
signal
heard
directly
in
the headphone
or
speaker.
This control
only
affects
what
is heard
in
the
headphone
or speaker
and does
not
affect
"Program"
feed
to the
intercom
lines.
14. 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
it
desired
by
moving
an
internal
jumper.
(see
section
on
internal
options
and
adjustments)
15. Power
Supply
LEDs
There
are
two power
supply
status
LEDs
in
the lower
right
hand
corner
of
the front
panel.
NORMAL
OPERATION:
The
GREEN
LED
is
on by
itself.
OVERLOAD
CONDITION:
If
the RED
LED
is on
and
the GREED
LED
pulses
on
shortly
about
every
five
seconds,
the
load is
in excess
of
1 ampere
but there
is
not a
direct
short
on
the line.
SHORT
CONDITION:
If the
RED
LED
is on
and the
GREEN
LED
does
not pulse
on,
the
power
line has
a direct
short
on ft.
Lowering
an excess
load or
removing
a short
will
allow
the automatic
reset
circuit
to
attempt
to reset
the
power
supply
about
once
every
four
seconds,
to restore
normal
operation
to
the
power
supply
without
operator
intervention.
11/90
Rev.
1.0
Page
20

Clear-Com MS-222 Specifications

General

Brand	Clear-Com
Model	MS-222
Category	Intercom System
Language	English