a、 After setting the DVR's recording schedule to trigger alarm recording, but still unable to record as DVR has alarm input, please check the alarm output type you connected to is consistent with your DVR, for example: alarm output type is NO (normally open), then it is necessary to set the alarm type of the DVR corresponding channel to NO, otherwise, DVR can not record.
b、 Whether motion detection sensitivity is turned on, whether set up motion detection area.
c、 Whether external alarm is turned on.