NDR-EA2104 / NDR-EA2208 / NDR-EA2416 User’s manual ver. 1.0
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CONNECTING EXTERNAL DEVICES TO ALARM INPUTS/OUTPUTS
6. CONNECTING EXTERNAL DEVICES TO ALARM INPUTS/OUTPUTS
NDR-EA2104, NDR-EA2208 and NDR-EA2416 are equipped with 4 alarm inputs (including
emergency recording input), and 2 open-collector type alarm outputs.
Connectors are equipped with clamp-on terminals. Layout of particular connectors is presented in
chapter 2.3.1 oraz 2.3.2.
Note:
Alarm inputs and outputs are not lightning-protected. User should protect the inputs against the
electric discharges that may damage the equipment.
Note:
Alarm outputs are not protected against overload. User should protect the outputs.
Maximum current for open collector output should not exceed 30 mA for 12 VDC. If system needs
connecting devices with bigger current requirements, 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
level or zero voltage. Appearance of high/low logical states on the input depends on settings in the
Sensors
submenu.
Below is shown a diagram presenting the alarm input no.1 circuit. When alarm input mode in the
Sensors
submenu is set to NO, closing the
SW1
switch activates the alarm input.
