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2.
REMOTE CONTROL
PANEL
275A/RC
(Optional)
[See
Appendix
C
for
wiring
instructions.]
The
Remote
Control Panel
replicates the
main
chassis'
front panel,
except
that the
SEPARATION
control
is
omitted.
The
Panel
is
powered from
the
main
chassis,
and
is
connected
to
it
by
means
of a 19-pair
cable
terminated
at
both ends
with
a
37-pin
DC-37
connector.
Both connectors
are
supplied.
The customer must
provide the
cable.
Strictly
speaking, shielding of the cable
is
unnecessary
(although
it
may
be wise
in
a
high-RF
environment).
The
only
requirement
is
that the
total
end-to-end
resistance of
any wire
within the cable
be
less
than 100
ohms.
Check
before you buy
to
make
sure
that the cable
is
compatible with your
plant wiring practices
and
local building
codes.
Some
cable suggestions are
shown
in
Appendix
C.
To
configure the
main
chassis:
Remove
the top
cover
of
the
main
chassis.
The
unit
is
shipped
from
the factory with
one
ribbon cable
from
the front panel
plugged
into a
16-pin
DIP
socket,
J5,
located
towards
the rear panel. This
is
correct
for
non-remote
operation.
For
remote
operation,
this
cable
must
be unplugged
from
J5
and plugged
into
J4,
which
is
immediately
to
the right
of
J5
when
observed with
the front panel
facing
you
(see Fig.
2-2).
IMPORTANT!
Since
all
lamps
are
wired
in
series
(including those
which
activate the
275A's optically-coupled crossfade
function), the
275A
will
not
work
(although
it
will
not
be
damaged)
if
the cable
is
plugged
into
J4
when
the
273A/RC
Remote
Control Panel
is
not correctly
connected.
In
particular,
no
lamps
will light.
If
the
Remote
Control Panel
is
to
be disconnected
for
any
reason, the
275A's
internal
cable
must
either
be repositioned
to J5,
or
an appropriate external user-supplied
jumper
plug
must
be
inserted
in
the
Remote
Control Panel connector
to
achieve normal
operation.
See
Appendix
C
for a
wiring
diagram.
Fig. 2-2:
Chassis Configuration For
Remote
Control Operation
2-3
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