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Dedicated Micros ©2009
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SD Adv
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The SD Advanced supports 20 normally open/closed tamper proof alarm inputs, or one Global
keyswitch input with camera specific inputs configurable as entry/exit alarms. The alarms support
tamper proof detection using 1k in line and 5K end of line resistance. The unit detects short circuit,
open circuit and contact closure. This functionality is part of the advanced alarms supported on
NetVu Connected products and includes features required for Central Monitoring. It is compatible
with the British Standard BS8418.
Relay Connector
Pin
Alarm Input Connection
1 - 20
1-20
21-25
Earth Common
End Of Line Circuitry
The following describes the EOL tamper alarms circuitry needed when EOL has been configured.
There should be two resistive values within the tamper alarm circuitry. These must be located inside
the alarm device (furthest point from the unit).
The alarm state could be Normally Open or Normally closed however the tamper states are the
same for both settings.
Open, the resistive value is 6.8K ohms (1K + 5.6K).
Closed, the resistive value is 1K ohms, as the circuit does not see the 5.6K ohm resistor.
Open Circuit Tamper, the resistive value is infinity as the circuit has been cut and
therefore is ‘open’.
Short Circuit Tamper, the resistive value is 0 Ohms.