75Maximum switch currency 1AInsulation Between touches with samepolarity 1000VAC 1minuteBetween touches with differentpolarity1000VAC 1minuteBetween touch and winding 1000VAC 1minuteSurge voltage Between touches with samepolarity 1500V (10×160us)Length of opentime3ms maxLength of closetime3ms maxLongevity Mechanical 50×106 times (3Hz)Electrical 200×103 times (0.5Hz)Temperature -40℃ ~+70℃3.8 RS485When the DVR receives a camera control command, it transmits that command up the coaxialcable to the PTZ device. RS485 is a single-direction protocol; the PTZ device can’t return anydata to the unit. To enable the operation, connect the PTZ device to the RS485 (A,B) input onthe DVR.Since RS485 is disabled by default for each camera, you must enable the PTZ settings first.This series DVRs support multiple protocols such as Pelco-D, Pelco-P.To connect PTZ devices to the DVR:1. Connect RS485 A,B on the DVR rear panel.2. Connect the other end of the cable to the proper pins in the connector on the camera.3. Please follow the instructions to configure a camera to enable each PTZ device on theDVR.Figure 3-33.9 Other InterfacesThere are still other interfaces on the DVR, such as USB ports.485 Port
