Clear-Com RM-120A Specifications download pdf (Page 6)

Before

you

install

the

system,

consider

the

fol

lowing

poi

nters

to

help

determine

how

to

configure

the

intercom

connections.

Multiple

Power

Sources:

Loop-Through Method:

Clear-Com

Main Stations

and

Power

The

common

method

to

interconnect

Supplies

can

be

paralleled

together stations

is

with

a

daisy-chain,

as

in

an

intercom

system;

having

an

shown

here

(using

one

channel):

extra

source

provides

i

ncreased

n

REMOTE

current

capability

(you

can

add

CS

210A

n

STATIONS

more stations

to

the

mile

of

cable)

Q

B

and

a

back-up

power

supply.

If

using

two

sources

of

DC

power,

"DAISY-CHAlNS'

termination

for

the

system

must

This

works

well,

but

if

the

line

occur

in

one

source

only;

the

ter-

were

broken

anywhere

along

the

mination

switch(es)

should

be

ON

feed,

all

communicating

would

stop.

in

one

Main

Station

and

OFF

in

the

An

alternative

(shown

below)

solves

other.

See

diagram.

a

potential

problem

by

using

TWO

CS-210ffi 1 _

AUDIO

Channel

A

(or

B,

etc)

output

con-

9.ce-u>

= _

(-30

VDC

nectors

for

one stretch

of

cable.

tstm~xioscszCOMlMON

If

the

line

were

cut

at

one

point,

TO-21CL_ l e C

activity

on

the

channel

continues.

i=F

}SYSTEM

CS-

20

LOOP-

DUEL-POWER

SETUP

DOUBLES

SYSTEM

B

>-;,THROUGH

CAPACITY

4

PROVIDES

BACK-UP

POWER

Signalling

Configurations

in

Multi-Channel

Systems:

In

normal

circumstances,

the

Call

nel

A

stations

or

Channel

B

sta-

light

on

a

two-channel

selectable

tions

send

a

signal.

remote station

(which

communicates

on one channel

at

a

time)

illumi-

The

diagram

below shows

a

group

of

nates

only

when

someone

sends

a

two-channel stations

talking

on

signal

on

the channel

currently

Channel

B

who

want

to

receive

call

being

used by

that

station,

not

the

signals

from

stations

using

Channel

other. This

is

because the

Call

A

(this

is

one-way

signalling

signal

travels

on the

intercom

Channel

B

cannot

send

a

signal

to

audio

line

(in

the

form

of

DC

vol-

Channel

A).

tage).

This

is

accomplished

by

placing

However,

you

can MODIFY

the two-

four

diodes

(914-type)

in

series

on

channel

cable

that

is

input

to

the

two-channel

intercom

line

as

multi-channel stations

(KB-IIIA,

shown. The

call signal

follows

the

RM-120A, MR-102A)

so

that,

no

mat-

direction

of

the

diodes.

Call

sig-

ter

what

channel that

group

of

naIling

is

now

possible

from

"A"

stations

is

using,

their

Call

stations

to

"B"

stations.

lights

will

go

on

when

either

Chan-

ALTERNATIVE

SIGNALLING

:IODE

(

/

,'..

1O

'

924sl

Tyk

.

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