NDR-EA3104M User’s manual - 1.0 version
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CONNECTING EXTERNAL DEVICES TO ALARM INPUTS/OUTPUTS
6. CONNECTING EXTERNAL DEVICES TO ALARM INPUTS/OUTPUTS
NDR-EA3104M DVR features 2 alarm inputs and 2 alarm outputs.
Connectors are equipped with clamp-on terminals. Locations of particular connectors are presented in
chapter 2.3.
Note:
Alarm inputs and outputs are not lightning-protected. User should protect the inputs against the
electric discharges, that may damage the equipment.
Maximum current for alarm output should not exceed 0.17 A for 60V. If system needs connecting
devices with bigger current demand, please use additional circuits, e.g. using relay. Output may operate
either as NO or NC type.
Alarm inputs implementation:
Alarm inputs operate in TTL/CMOS standard, therefore may be activated either by appropriate voltage
levels or zero voltage. Appearance of high/low logical states on the input depends on settings in
Sensors
submenu.
Next page contains a diagram presenting the alarm input no.2 circuit. When alarm input mode in the
Sensors
submenu is set to NO, closing the
SW1
switch activates the alarm input.
SW 1
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