D-Link DCS-5222L User Manual page 27

Section 3 - Installation
Attaching a cable to the I/O Terminal.
The 4-pin I/O connector is located at the rear
panel and provides an interface for photo-
coupled switch output and photo-coupled
input. An example of what can be done
with a digital input and digital output is the
connecting of a motion sensor to the port,
signalling the camera to take a snapshot and
trigger an alarm connected to the port.*
(*Further details and a technical specification
can be found on page 51)
D-Link DCS-5222L/DCS-5211L User Manual 18