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1475A Installation
MOUNTING
Tabletop and rack-mount models are available and may be
mounted in a convenient location near associated monitors.
Tabletop models are 1.88" high and 1'l"wide. Rack-mount
models are denoted with the suffix R and
are
designed for use
in
standard
EIA 19" racks and
are
1.75" high
and
1 9 wide. Avoid
heat sources o r poorly ventilated racks. Operating temperatures
must be held within a reasonable range to ensure proper
operation. Consult factory for further details.
connectiom
All connections are made on the rear panel.
Video Cabling
U s e
a good
grade
of 75-0hm coaxial cable such as Belden 8241
or
equivalent with BNC connectors.
Video Inputs
Four
pairs of BNC connectors
(1-5,
2-6, 3-7, 4-8) are used for
video inputs. The camera connected to a BNC is automatically
assigned tbe corresponding on-screen camera number.
Video Inputs 1 thru 4 are displayed
in
Quad
A.
Video
Inputs
5
thru
8
are displayed in Quad
B.
&Position Slide
Switch
A
3-position slide switch located under each video-input pair
configures the pair
in
one of three ways. Each pair of BNC
connectors is associated with one quadrant and each slide switch
is associated only with the
pair of
connectors directly above the
switch.
CENTER
(75-75)
-
Terminates each input in 75 ohms and
makes
them
independent video inputs.
LEFT
(75)
-
Connects the video from the lower- numbered
BNC to the higher-numbered BNC for display
in
both Quads
A
and B. This
input
is terminated.
T h e
higher-numbered BNC is
not usable.
RIGHT
(HZ)
-
Same as LEFT but not terminated. The higher-
numbered BNC must
be
looped to properly terminated external
video devices.
Video Outputs
Two Video Out BNCs, CALL and
QUAD,
are used for video
inputs to monitors, VCRs, etc. Each must
be
terminated at the
end
of
the cable
run.
Alarm Inputs
Inputs ("closures" or "opens" to ground) to ALARMS
connections 1
thru
8 from user-supplied alarm devices
call the
corresponding Video Input. "Closures" must have a resistance of
500 ohms or less; "opens" a resistance of 100,ooO
ohms
or more.
Twisted pair may
be
used for wiring from
the
alarm
devices.
Alarm Output
Two RLY connections access a relay which closes during alarms
for activation of
a
VCR or other device. Relay contacts are for
low-level control circuitry only.
Power
The
Model
Number and operating voltage are shown on the rear
panel. Connect the appended 3-wire cord to the required power
source.
1475A and 1475-
models require 120V, 60 Hz.
1475AX
and
1475ARX
models require 220/240V, 50 Hz.
120V, 50 Hz and 24OV,
60
Hz combinations are possible by
alternate internal jumper positions. Consult factory for details.
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