Service manual

Il-C. System Architecture
The number
of ways in which
you can set
up a four-channel
intercom
system
are nearly
infinite.
However,
the
"system
architecture"
will
usually fall into one of two categories:
TYPE 1,
in which
an MS-400A
is the only
four-channel
station,
and it
connects to a number of one- and two-channel remote
stations as shown
*
in the
diagram
below.
This
type of
system
is used
in situations
where
only
one location
needs
access
to four
separate
remote stations
or
four
separate
groups
of remote
stations.
2CH
*
[DA
AM
11
_
D
|
S _MS-400A
c 0 ~ ~ ~ ~
~ ~~ D-REMOTE
STATION
TYPE 2, in which
the MS-400A
is connected to
RM-400A's, as
shown in the
diagram below.
Systems of this
type are used
when more than one
loca-
*
tion needs
to communicate
with
each other and
other remote
stations or
groups of remote stations.
0 | t RM-400A | | | RM-400A | [ E e MS-400A
On ALL
rear panel intercom
connectors,
the pin-outs
are:
PIN
1--
COMMON
PIN
2-- +VDC
PIN 3-- AUDIO
7