Installation manual
Installation 43
Note
Single balancing provides the same level of protection as Double balancing, when the tamper contact of
the detector is connected to a balanced zone on the control panel.
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
0standbyalarm
Alarm
+12V GND
Ohm Zone
> 6800 alarm
6800 standby
0tamper
Alarm
+12V GND
6K8ƻ
Ohm Zone
> 6800 tamper (wire cutting)
6800 alarm
6800 / 2 standby
0 tamper (short-circuit)
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