COP-USA USBDVR04SP - Manual (Page 46)

MAXDVR & DR Series Cards 46
Alarm Record
Fig4.14 Alarm trigger method configuration
Every sensor can trigger multiple channels to record. For example, if
users select CAM1, CAM4 and CAM5 for Sensor2, then once the sensor is
activated, CAM1, CAM4 and CAM5 will begin to record. Users can also select
the voltage, high and low, for alarm signals.