Input and Output Connections
24
AC-215x-B Series Hardware Installation Manual
4.1.6
Normally Closed Supervised Double Resistor Input Connection
Connect a 2.2 k
Ω
resistor in series to the input switch contacts.
Connect an 8.2 k
Ω
resistor parallel to the input switch contacts.
Normally Closed Supervised Input has 3 states:
Switch Closed – Normal State:
Loop resistance = 2.2 k
Ω
Switch Open – Abnormal State:
Loop resistance = 10.4 k
Ω
Open circuit (Infinite loop resistance) or short circuit (0 resistance) across
input terminals – Trouble State
Figure 14: Normally Closed Supervised Input (Double Resistor) Connection
4.2
Inputs Description
4.2.1
Request-to-Exit Button (REX) Input
Use the REX input to open a door directly. Typically, the REX input is connected
to a Normally Open push button that is located inside the premises. The push
button is generally located in an easy-to-access position and opens a door
without reading a proximity card or PIN code.
Single door controller:
Door 1 – IN1
Double door controller:
Door 1 – IN 1
Door 2 – IN 2
