D V R - 8 2 0 4 / 8 2 0 4 V / 8 2 0 4 S V / 8 2 0 4 T / 8 2 0 4 S T U S E R M A N U A L
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8. USB: support USB2.0, to backup and upgrade;
9. NET: internet port;
10. N/P : Means PAL or NTST ;
11. DC 12V: for adaptor;
12. ON/OFF: the power switch.
Appendix 2. Alarm, Relay, PTZ ports contents
Illumination
：
1. GND
：
grounding wire;
2. ALMIN 1
－
4
：
1-4CH alarm in;
3. NO1. COM1
：
Relay port, it will turn-on when working;
4. 485T+. 485T-
：
422/485 sending port;
5. 485R+. 485R-
：
422/485 receiving port;
6. If connect With PTZ, then only need connect with 485T+. 485T-;
7. If connect with cluster port, then need to connect with 485R+. 485R- . 485T+
and 485T-.
