Hardware Installation
20 Andover Controls Corporation
Supervisory Input Circuits
All 780/781 controller series inputs are supervisory inputs. The follow-
ing drawings depict the six types of supervisory inputs that exist—three
normally closed and three normally open types. After the drawings,
there is an explanation of which types are recommended for access con-
trol installations.
Figure 6 shows the three types of normally closed supervisory inputs.
Figure 6. Normally Closed Supervisory Inputs
NC Series
Door Closed SW Closed 10K
Door Open SW Open Infinite
SW Shorted Zero K
Wire Cut Infinite
Door Open and Wire Cut conditions both result in an infinite reading
.
If the door was sensed open without a valid card swipe, a Door Violation
should be triggered.
NC Parallel
Door Closed SW Closed Zero K
Door Open SW Open 10K
SW Shorted Zero K
Wire Cut Infinite
Not the best choice, the switch could be shorted and the door forced open,
and the system would still think the door was closed.
Door Closed SW Closed 5K
Door Open SW Open 10K
SW Shorted Zero K
Wire Cut Infinite
This configuration is the best choice; the parallel and series resistors
provide a redundant securit
feature.
NC Series and Parallel
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