Dedicated Micros DV-IP Express Nstallation And Operation Manual page 16

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End Of Line Circuitry

The following describes the �O� tamper alarms circuitry needed when �O� has been configured.

There should be two resisti�e �alues within the tamper alarm circuitry. These must be located inside

the alarm de�ice (furthest point from the unit).

The alarm state could be Normally Open or Normally Closed, howe�er the tamper states are the

same for both settings.

Open, the resisti�e �alue is 6.8� ohms (1� + 5.6�).

Closed, the resisti�e �alue is 1� ohms, as the circuit does not see the 5.6� ohm resistor.

Open Circuit Tamper, the resisti�e �alue is infinity as the circuit has been cut and therefore is 'open'.

Short Circuit Tamper, the resisti�e �alue is 0 ohms.

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