... & Windows based software3.2.VideoVideo Input:1/2/4 Channel, 1.0Vp-p, 75ΩVideo Standards: PAL625Line,50f ... /2/4 channelAudio Output: 1 channelAudio CompressionADPCMConnector: RCA3.4.Alarm 1/2/4 channel bi-directionalConnector: Terminal Block with Screw ClampsNormally ... InterfaceRS232: Data transmitting, DB9 connectorRS485: PTZ control, Terminal Block with Screw Clamps connector3.6.USB Interface1 Host ...