DVR systems DVRxx04HF-U Series - Manual (Page 12)

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Client-end user can download the file to local HDD to backup via network.
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Record & playback function
Support each channel real-time record independently, and at the same time it can support
search, forward play, network monitor, record search, download and etc.
Support various playback modes: slow play, fast play, backward play and frame by frame
play.
Support time title overlay so that you can view event accurate occurred time
Support customized zoom function during the preview.
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Network operation
Support network remote real-time monitor, remote record search and remote PTZ control.
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Alarm activation function
Several relay alarm outputs to realize alarm activation and on-site light control.
The alarm input port and output has the protection circuit to guarantee device safety.
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Communication port
RS485 port can realize alarm input and PTZ control.
RS232 port can connect to keyboard to realize central control, and can also connect to PC
COM to upgrade system and realize maintenance, and matrix control.
Standard Ethernet port can realize network access function.
The dual-network port has the multiple-access, fault-tolerance, load-balance setup mode.
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PTZ control
Support PTZ decoder via RS485.
Support various decode protocols to allow the PTZ to control the speed dome.
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Intelligent operation
Mouse operation function
In the menu, support copy and paste setup function
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UPNP (Universal Plug and Play)
Establish mapping connection between LAN and WAN via UPNP protocol.
Slight function differences may be found due to different series.
1.3 Specifications
1.3.1 General Series
Parameter 4-ch 8-ch 16-ch
Main Processor High-performance industrial embedded micro controller
System
OS Embedded LINUX