Input and Output Connections
20 AC-225x-B Series Hardware Installation and User Manual
4. Input and Output Connections
This chapter describes the AC-225x-B access control panel's input and output
connections.
4.1 Input Types
There are four input types – Normally Open, Normally Closed, Normally Open
Supervised 1 or 2 resistors, and Normally Closed Supervised 1 or 2 resistors.
Inputs IN1, IN1A, IN2 and IN2A may be configured individually as either supervised
or non-supervised inputs. Configure each input separately via the AxTraxNG
system.
Non-supervised inputs have two states:
▪ Normal State
▪ Abnormal State
Supervised inputs have three states:
▪ Normal State
▪ Abnormal State
▪ Trouble State
The Trouble state is caused by either tampering with the input circuit or by faulty
hardware installation. Once configured as supervised input, add a resistor of 2.2
kΩ, of 8.2 kΩ or both on the input circuit. See the figures in the following
subsections.
4.1.1 Normally Open Input Connection
Normally Open Input has 2 states:
▪ Switch Open – Normal State:
Loop resistance = Infinite (open circuit).
▪ Switch Closed – Abnormal State:
Loop resistance = 0 (short circuit)
Figure 10: Normally Open Input Connection
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