User Guide

The Unit Connectors AXIS 2420 User’s Manual
66
The I/O-B Connector
The 4-pole I/O-B connector provides a digital relay switch for the control of external
surveillance devices and services; such as, lighting, annunciators, audible alarms, etc. It is
also an RS-485/422 port for the control of pan tilt devices, etc. A pinout table is provided
below.
Pinout Information
Schematic diagram - showing possible application
Pin Function
1 Relay switch - pole 1. Electrically isolated from chassis and connectors.
2 Relay switch - pole 2. Electrically isolated from chassis and connectors.
3 RS-485/422 - B (inverting)
A half-duplex RS-485/422 interface for controlling auxiliary equipment.
4 RS-485/422 - A (non-inverting)
1
2
3
4
I/O-B
Relay
Switch
Mains Power
24V DC
Appliance
Optional
Relay
Switch
o
o
o
o
x
o
o
o
o
o
o
o
o
o
RS-485/422 B
RS-485/422 A
1
2
3
4
+
_
!
!
PTZ
Device
External