Andover Controls ACX 780 User Manual

Hardware Installation
ACX 780/781 Installation Guide 21
Figure 7 shows the three types of normally open supervisory inputs.
Figure 7. Normally Open Supervisory Inputs
We recommend NO Parallel and NO Series and Parallel types for
access control installations. The next sections explain how to wire these
types of inputs for door switches and motion detectors.
NO Series
Door Closed SW Open Infinite
Door Open SW Closed 10K
SW Shorted Zero K
Wire Cut Infinite
This configuration is not the best choice. If the wire is cut and
NO Parallel
Door Closed SW Open 10K
Door Open SW Closed Zero K
SW Shorted Zero K
Wire Cut Infinite
NO Series and Parallel
Door Closed SW Open 10K
Door Open SW Closed 5K
SW Shorted Zero K
Wire Cut Infinite
and the system senses that the door is still closed.
the door
forced open,
This configuration is defeated by shorting the switch. The systems senses this
condition as a normal door open situation. However if the wire is cut, that is a
unique resistance that can easily be identified as a tampering situation.
This configuration provides the most security. There are four unique resistance values
associated with the four possible conditions.
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Andover Controls ACX 780 Specifications

General

Brand	Andover Controls
Model	ACX 780
Category	Controller
Language	English