NDP31 is the display unit installed in the management center. It is used to display the four highest priority calls from top left to bottom right of the display.

The same priority calls are displayed in chronological order.
The highest priority is for critical beds with colored border.

The second highest is for service calls with colored border.

The third highest is for bed emergency calls with colored border.
The lowest is for bed normal calls with no border.

The colors of the borders is customizable.
The Alarm for a new call is played by an internal speaker with melodies stored on a local Micro-SD card.