38
Installation
3-5-3
Double (Dual EOL) balancing
Double balancing (also known as 4 State Monitoring) 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.
3-5-4
Double-Zone balancing
Double zones without EOL resistor can discriminate 5 conditions on the
entire terminal:
•
standby on both zones
•
alarm on zone 1 and standby on zone 2
•
alarm on zone 2 and standby on zone 1
•
alarm on both zones
•
tamper (wire cutting)
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
3-5-5
Double Zone balancing with EOL
Double zones with EOL resistors can discriminate 6 conditions on the
entire terminal:
•
standby on both zones
•
alarm on zone 1 and standby on zone 2
•
alarm on zone 2 and standby on zone 1
•
alarm on both zones
•
tamper (wire cutting)
•
tamper (short-circuit)
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
Ohm
Zone
> 6800
tamper (wire cutting)
6800
alarm
6800 / 2
standby
0
tamper (short-circuit)
A
l
a
r
m
+12V GND
Ta
mp
er
6K8Ohm
1/4W
Ohm
Zone 1
Zone 2
(double)
> 3900 + 6800
tamper
3900 + 6800
alarm
alarm
6800
standby
alarm
3900
alarm
standby
0
standby
standby
A
l
a
r
m
+12V GND
Ta
mp
er
A
l
a
r
m
+12V GND
Ta
mp
er
3K9Ohm
1/4W
6K8Ohm
1/4W
Zone 1
Zone 2
Ohm
Zone 1
Zone 2
(double)
> 2 x 3900 + 6800
tamper (wire cutting)
> 2 x 3900 + 6800
alarm
alarm
3900 + 6800
standby
alarm
2 x 3900
alarm
standby
3900
standby
standby
0
tamper (short-circuit)
A
l
a
r
m
+12V GND
Ta
mp
er
A
l
a
r
m
+12V GND
Ta
mp
er
3K9Ohm
1/4W
6K8Ohm
1/4W
Zone 1
Zone 2