Hardware interface 

 DS-8001HC, DS-8002HC, DS-8003HC: 

 1, RS-232, RS-485 serial interface; 
 2, ALARM IN alarm input, ALARM OUT alarm output module; 
 3, eSATA backup interface (optional); 
 4, ground, AC110/220V power; 
 5, UTP network interface (with the ETHERNET network interface); 
 6, VGA display output interface; 
 7, LINE IN audio input interface, USB backup interface; 
 8, VIN video input, AIN audio input, VOUT local monitoring, AOUT local audio surveillance interface. 

 DS-8004HC, DS-8005HC, DS-8006HC, DS-8008HC, DS-8009HC, DS-8010HC, DS-8012HC, DS-8014HC, DS-8016HC: 

 1, VIN video input, AIN audio input interface; 
 2, VOUT local monitoring, AOUT local audio surveillance interface; 
 3, LINE IN audio input interface, USB backup interface; 
 4, VGA display output interface; 
 5, RS-232, RS-485 serial interface, KEYBOARD keyboard interface; 
 6, UTP network interface (with the ETHERNET network interface); 
 7, ALARM IN alarm input, ALARM OUT alarm output module; 
 8, ground, AC110/220V power.