Vacron 16CH NVR User Manual page 22

3) Sensor device must install and connect to ALARM IN. The NVR supports
up to 16 sensors. Click [ENABLE] and select NO (normal open) or NC
(normal close). When sensor triggers, email, SMS phone, and ALARM
OUT (1~4) notifications can be sent out simultaneously. Click [SAVE] to
save and exit sensor setting.
4) ALARM OUT device must install. The NVR supports up to 4 ALARM OUT
devices. It may be triggered by motion detection, signal loss, or sensor
detection (1~16). Click [ENABLE] to enable ALARM OUT function. Set
device name, type: NO (normal open) or NC (normal close) and duration
time. Click [SAVE] to save and exit ALARM OUT setting.
18