Planning the Installation
Page 22
Detector (zone) wiring types
Before installation, you need to choose the wiring type (method) to use for any wired
detectors: Fully-Supervised Loop (FSL), 4-wire Closed Circuit (CC), or 2-wire CC, as
described below.
The latest EXP-W10 wired expander allows you to mix FSL and 4-wire CC on the same
expander. Other devices, including the control unit itself, require you to use the same
wiring type for all wired detectors connected to the same device.
You will need to ensure that all detectors are wired correctly and that you select the default
wiring type during the initial power-up procedure. If necessary, you can edit the wiring type
for individual devices.
The wiring types are as follows.
Fully Supervised Loop (FSL)
This uses a single pair of wires for each detector, with resistors at the end of the line and
across the alarm contact (Figure 2). The resistors allow the system to monitor for short-
circuit or open-circuit conditions to guard against cable tampering.
Figure 2. FSL connections (using 2k2 and 4k7 resistors)
The End-of-Line (EOL) and alarm contact resistors can be any of the following values
(respectively): 2k2 and 4k7, 1k and 1k, 2k2 and 2k2, or 4k7 and 4k7. The resistance bands
for FSL are as shown in Table 4.
Table 4: FSL Resistor Bands (without Masking)
Zone State
2k2/4k7 FSL
1k/1k FSL
2k2/2k2 FSL
4k7/4k7 FSL
Tamper
0k0
– 1k759
0k0 - 0k799
0k0
– 1k759
0k0
– 3k759
Normal
1k76
– 4k08
0k8 - 1k4
1k76 - 3k08
3k76 - 6k58
Alarm
4k081
– 8k28
1k401 - 2k4
3k081 - 5k28
6k581 - 11k28
Tamper
> 8k28
>2k4
>5k28
>11k28
If a detector is able to report masking, connect the detector as shown in Figure 3. The
detector must signal masking by closing both the Alarm and Fault contacts together. If the
detector closes the Fault contact only, the control unit reports this as a detector fault.
EOL
Tamper
Alarm