Operating instructions

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DV-IP HD

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.