Rosslare AC-425 - 4 Input and Output Connections; Input Types; Normally Open Input Connection

Input and Output Connections
20 AC-425 Hardware Installation and User Manual
4. Input and Output Connections
This chapter describes the AC-425 access control panel's input and output
connections.
4.1 Input Types
There are four input types:
 Normally Closed (N.C.)
 Normally Open (N.O.)
 Single EOL resistor
 Double EOL resistor
Inputs IN1, IN2, IN3, and IN4 may be configured individually as either
supervised or non-supervised inputs. Use the AxTraxNG system to configure
each input separately.
Non-supervised inputs have two states:
 Normal
 Abnormal
Supervised inputs have three states:
 Normal
 Abnormal
 Trouble
The Trouble state is caused by either tampering with the input circuit or by
faulty hardware installation. Once an input is configured as a supervised input,
add a resistor of 2.2 kΩ, of 8.2 kΩ, or both on the input circuit. See the
following diagrams.
4.1.1 Normally Open Input Connection
A Normally Open Input has 2 states:
 Switch Open – Normal State:
Loop resistance = Infinite (open circuit)
 Switch Closed – Abnormal State:
Loop resistance = 0 (short circuit)