The following explains a few scenarios where the communication between the display unit and the Camera-Viewer EX is lost. In such events, the Camera-Viewer EX remains frozen for the duration of the communication time-out period. When the time-out period is over, an error message appears. The time-out period is 20 seconds.
You are displaying the image from a display unit's video camera with Camera-Viewer EX, but you have specified a non-existing IP address.
You are displaying/recording the image from a display unit's video camera with Camera-Viewer EX when the cable gets disconnected.
You are displaying/recording the image from a display unit's video camera with Camera-Viewer EX when the display unit is powered off.