Continuum I/O System Reference
125
Recommended Input Circuits
We recommend
NO Parallel
and
NO Series and Parallel
types for access control
installations. The following pages explain how to wire these types of inputs for door
switches and motion detectors.
Wiring Door Switches
There are three supervisory inputs for door switches. The maximum length wire you may
use is 500 ft of #18 gauge wire (152 m of 1.0 mm
2
wire) or 200 ft of #22 gauge wire (60
m of 0.35 mm
2
wire).
Some switches have built-in resistors that facilitate Series Parallel connections as shown
below:
The following diagram graphically illustrates the operation of the NO Parallel Supervised
Input:
AC-1
AUX
or
DOOR
or
REX
RET
10 K
Ω
Switch with
Built-In Resistor
AUX
or
DOOR
or
REX
RET
Normally Open
Door Switch
10 K
Ω
Door Closed
(Normal)
AUX
or
DOOR
or
REX
RET
Normally Open
Door Switch
10 K
Ω
Detects
Door Open
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