JVC VR-616U - 16 Channel Digital Video Recorder Instructions Manual page 19

15) Automatic check and recovery function
The system is designed for continuous, fault-free operation with built-in, self-monitoring
functions that monitor each component of the system and will automatically restart into
the previous mode if a system failure is encountered.
16) Camera control of popular dome models
Able to control a multitude of external cameras through the RS-485 port.
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JVC VR-616