Switches - Assa Abloy PTI AP1 User Manual

KEYPAD
AP1
USER MANUAL

| SWITCHES

Input Switch Supervision
The AP1 has the capability to monitor the two inputs for tampering. This is accomplished
by using supervised switches. Supervised switches incorporate 1K ohm resistors
securely located inside the switch housing.
Supervision Type Diagram
Unsupervised
Series
Supervised
Parallel
Supervised
Dual Supervised
Page - 14
Description
An unsupervised configuration is shown to
the left. There is no supervision resistor. In
this configuration the controller detects no
difference in a cut wire or open switch or
a shorted wire or closed switch. A switch
configured as unsupervised will not produce a
tamper event for its input as it has no means of
knowing that tampering has occurred.
A Series Supervised configuration includes a
1K ohm resistor in series with the switch. In
this configuration, a short in the wires can
be detected and tamper event produced. A
cut or open will not be seen any differently
that an open switch contact, therefore this
configuration only provides protection for
normally open switches.
A Parallel Supervise configuration includes
a resistor in parallel with the switch. In this
configuration, an open can be detected and
produce a tamper event. A short will not be seen
by the controller any differently than a closed
switch contact, therefore this configuration
only provides protection for normally closed
switches.
A Series / Parallel supervised configuration
includes a 1K resistor in parallel and a
1K resistor in series with the switch. This
configuration can detect both opens and shorts
in the wires which connect to the switch and
will produce tamper events as a result. This
configuration provides protection for both
normally open and normally closed switches.