DVR systems DVR31xxH Series - Manual (Page 117)

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Source IP refers to host IP address that sends out information (usually it is the device host
connected to the DVR.)
Destination IP refers to other systems that receive information.
There are total four groups IP. The record channel applies to one group (optional) only.
Six frame ID groups verification can guarantee information validity and legal.
The start position, length and data can be set according to your protocol and data packet. There
are total four fields.
Figure 7-51
7.3.4.2 Auto Register
Auto register interface is shown as below. See Figure 7-52.
Figure 7-52 Auto Register