Installing and Maintaining i-on10
Page 15
Doors
attribute set (see page 31). The zone must use 4k7 shunt resistors and a 2k2 EOL
resistor.
Figure 4. Two detectors per zone (Double Doors)
4-wire CC
This uses a separate pair of wires for the alarm and tamper contacts. No end-of-line
resistors are used. Selecting 4-wire CC normally halves the maximum number of wired
zones that can connect to the i-on10. However, an ADP-10CC board can be fitted to
convert the ten FSL zones to ten 4-wire CC zones. Without the board fitted, the control unit
supports five 4-wire CC zones. If you are using an ADP-10CC board, select 2-wire FSL
2k2/4k7 as the wiring type.
2-wire CC
This uses a single pair of wires for each detector. No end-of-line resistors are used.
Checking cable requirements
Standard cable type
Normally, the control unit requires standard 7/0.2 un-screened 4-core alarm cable for
wiring to keypads and wired siren/strobe units.
Screened cable
For maximum performance in environments where there is electromagnetic noise, use
twisted-pair screened cable with a characteristic impedance of 100-120 Ohms, such as
Belden 8132 or cable designed for RS485.
If screened cable is required:
1. Avoid earth loops by connecting the screen on the cable to mains earth at the
control unit but not at the keypad.
2. The continuity of the cable screen is most important and screens MUST be
continuous along the full length of the cable.
3. Where the cable enters any metal enclosure, ensure the screen is isolated from
the case.
Cable segregation
Segregate bus cabling to keypads from any other wiring, such as mains cables, telephone
cables, computer network cables and R.F. cables.
Keep cables to keypads clear of cables supplying extension loudspeakers or any high-
current devices.
Mains cable routing
Use separate cable-entry holes in the enclosure for mains and signal cables. Please refer
to the
i-on10 Installation Instructions
for details of the holes to use for each type of cable.
EOL
Tamper
Tamper
Alarm
Alarm
