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2. Device interface
2.1 Front panel
（1）PWR: after the power supply is switched on, light indicates power status.
（2）SYS: the system will run normally if the indicator is flickering and the indicator will be off for a
long time during Starting.
（3）USB：the system supports USB recording.
2.2 Rear panel
（1）Chassis ground；
（2）Power plug, supporting AC 100V~240V power supply, 50~60Hz；
（3）Power switch;
（4）network interface, connect PC, on-line editing and command receiving and sending control;
（5）RESET: System reset button;
（6）RS232:communication interface, to connect the external central control equipment/ support camera
tracking;
（7）RS485：support camera tracking;
（8）GPIO：order transfer. For the specific connection mode, see GPIO setting in the 2.3 & appendix;
（9）OUTPUT:
Analog audio MIC \ LINE input interface;
（10）INPUT
: Analog audio output interface;
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