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Site Hardware
Control Outputs
56
Alarm Sensors
Most alarm sensor units have a dry contact for outputs, usually providing normally open
(NO) contacts or normally closed (NC) contacts. The sensor inputs to a Multi-Media LT DVR
are configured for normally open (NO) devices.
End-of-Line
A sensor input can also be configured as EOL (end-of-line or protected). The load for an
EOL connection is 2 k*, nominal.
Table 5-4
Sensor Hardware
Acronym
Sensor Input
NO
Normally Open
NC
Normally Closed
EOL
End of Line
Power Rating
Up to 24 mA can be drawn at each output. Use hookup wire in the 20-gauge range to
connect the outputs to relay triggered devices (locks, gates, warning sirens, and so on) to
a Multi-Media LT DVR.
Tools
You may need:
•
A slot screwdriver (supplied). The screws are slightly smaller than those for a 1/8 inch
screwdriver.
•
A wire stripper
Connector
1.
From the hookup wire tips, strip approximately 0.6 cm (1/4 inch) of insulation.
2.
Insert each relay control wire to the screw-type, terminal connector on the CONTROL
OUTPUTS terminal strip: one wire to ground and the other wire to the numbered
connection you choose.
Caution
To avoid short-circuits, ensure that bare wire is not visible at the rear panel.
Implication
Input is active when switch goes ON
Input is active when switch goes OFF
Input is active when switch goes ON, or if
wires to the alarm sensor are cut
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