Figure 27: Normally Closed Supervised Input (Single Resistor)
4.1.6. Normally Closed Supervised Double EOL Resistor Input Connection
Connect a 2.2 kΩ resistor in series to the input switch contacts.
Connect an 8.2 kΩ resistor parallel to the input switch contacts.
A Normally Closed Supervised Input has 3 states:
•
Switch Closed – Normal State:
Loop resistance = 2.2K
•
Switch Open – Abnormal State:
Loop resistance = 10.4 kΩ
•
Open circuit (infinite loop resistance) or short circuit (0 resistance) across input terminals – Trouble State
Figure 28: Normally Closed Supervised Input (Double Resistor)
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 any credential.
Scenario Setting
Two Readers per Door
Door 1 – IN 1A
Door 2 – IN 3A
Door 3 – IN 5A
AC-825IP Installation & User Guide
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