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The Unit Connectors
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
Pin
Function
Relay switch - pole 1. Electrically isolated from chassis and connectors.
1
Relay switch - pole 2. Electrically isolated from chassis and connectors.
2
RS-485/422 - B (inverting)
3
A half-duplex RS-485/422 interface for controlling auxiliary equipment.
RS-485/422 - A (non-inverting)
4
Schematic diagram - showing possible application
I/O-B
o
Relay
o
Switch
o
o
o
RS-485/422 B
o
RS-485/422 A
AXIS 2420 User's Manual
Optional
Relay
Switch
1
!
o
o
2
!
_
o o
+
24V DC
3
4
1
2
3
4
o
Appliance
x
o o
Mains Power
External
PTZ
Device
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