[HDVR-435/835/1635] Why can’t I preview picture of digital channel?

Please check the following possible reasons:  

• Did not add device.
• The device of related channel was not enabled.
• The device of related channel was not selected.
• The selected device did not connect to video sources.
• The channel title of selected remote device does not exist.
• Stream for remote channel was set by extra stream.
• User name and password were not matched.
• Entered IP address or port no. incorrectly when adding device.
• The resolution of added device was too large to display by the monitor.