D-Link ShareCenter DNS-320L User Manual page 269

Section 4 - Configuration
Recording Mode, with Record by Schedule selected:
Click the red box next to Motion Detection Record if you want to
wait for motion to be detected before the camera begins recording.
Drag the mouse over the time frame you want to set for recording. The
selected frames turn to red to indicate the selected recording duration.
Click Save Settings to finish.
D-Link ShareCenter DNS-320L User Manual 263