DS2 Setup Guide
Dedicated Micros ©2007
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DS2
Contact
Where multiple alarms are available, the relevant contact can be selected.
Input Source
The alarm inputs can be congured as Normally Open (N/O) or Normally Closed (N/C).
End of Line
Note: This option is only visible if Alarm Options->Advanced Alarms are enabled
The End Of Line (EOL) is part of the advanced alarm feature and enables the inputs to detect any
changes in the input electronic resistance, e.g. 0 – 800Ω. A change will result in a Tamper Alarm
(short circuit) being detected and the system switching to alarm mode.
By default the EOL contacts are disabled for each input.
End Of Line Circuitry
The following describes the EOL tamper alarms circuitry needed when EOL has been congured.
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 innity as the circuit has been cut and therefore is ‘open’.
Short Circuit Tamper, the resistive value is 0 Ohms.