42 Installation
Anti-intrusion control panels
3-5-1
N.C./N.O. Balancing
For N.C. (normally closed) and N.O. balancing (normally open), it is
possible to detect two distinct zone conditions:
• standby
•alarm
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
If you wish the detector to signal tamper events, connect the detector
“Tamper” terminal to a “24h” zone on the control panel.
3-5-2
Single balancing
Single zones can discriminate 3 conditions on the entire terminal:
• standby
•alarm
• tamper (short-circuit)
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
If you wish the detector to signal tamper events, connect the detector
“Tamper” terminal to a “24h” zone on the control panel.
3-5-3
Double balancing
Double balancing discriminates 4 distinct conditions on the zone terminal:
• standby
•alarm
• tamper (short-circuit)
• tamper (wire cutting)
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
Ohm Zone N.O.
> 2 x 3900 + 6800 alarm standby
> 2 x 3900 + 6800 alarm standby
3900 + 6800 alarm alarm
2 x 3900 alarm alarm
3900 standby alarm
0 standby alarm
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