Operating instructions

SD Advanced

The SD Advanced supports 20 normally open/closed tamper proof alarm inputs, or one Global

keyswitch input with camera specic inputs congurable 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 congured.

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 innity as the circuit has been cut and

therefore is ‘open’.

Short Circuit Tamper, the resistive value is 0 Ohms.