D-Link DCS-3411 User Manual page 61

Section 5 - DI/DO
Connect to an IR illuminator or other device in parallel connection. The
12V+/12V-
total output current should be under 200mA.
Receive signals from a motion detector or any other external security
DI
device.
DO Connect to an alarm or buzzer. Refer to page 47.
Connect to the RS-485 interface for controlling auxiliary equipment such
485+/485-
as an external camera enclosure to perform PAN and TILT movement.
Refer to page 49 for more information.
D-Link DCS-3411/3430 User Manual 61