hi all just installed a new camera(DS-2CE56D7T-IT3Z )hickvision motorized , which has just a zoom and focus option,im using it with the 7208 hickvision turbo dvr,i can get the zoom and focus to work ok with the switch that is on the camera,but when I use it through the ptz controls via the dvr once I press + or - zoom or + or - focus the camera just constantly does whatever I pressed even when I release the button and I have to disconnect the power to the camera to stop it,am I missing a setting somewhere thanks