Addressing and Zone Numbering
Page 29
number 058 to terminals Z1. When you add the next keypad, the control unit
allocates the zone numbers 057 to terminals Z2 and 056 to terminals Z1 on the new
keypad. Table 7 shows an example.
Table 7: Keypad
– FSL or 2-wire CC zones
Control
Unit
First
keypad
Z2, Z1
Second
keypad
Z2, Z1
Third
keypad
Z2, Z1
Additional
keypads
i-on30R
59, 58
57, 56
55, 54
...etc.
i-on40H
79, 78
77, 76
75, 74
...etc.
4-Wire CC
– When you wish a keypad to use 4-wire CC zone wiring, the control unit
still assigns zone numbers at the top of the zone numbering range, but this time it
uses only alternate zone numbers
Table 8 shows an example. For each keypad, the
Z2 terminals are the for the tamper contacts, and the Z1 terminals are for the alarm
contacts.
Table 8: Keypad
– 4-wire CC zones
Control
Unit
First
keypad
Z2(T), Z1(A)
Second
keypad
Z2(T), Z1(A)
Third
keypad
Z2(T), Z1(A)
Additional
keypads
i-on30R
59
57
55
...etc.
i-on40H
79
77
75
...etc.
Zone availability for keypads
It is possible that there may be no zones available to assign to a keypad. This can happen
in two ways:
When the control unit has expanders allocated to all the available zones on the bus.
When the control unit has an expander already allocated to the zones at the top of its
zone numbering range.
Figure 9 provides three examples of zone availability when using expanders and keypads
connected to an i-on30R:
Example a)
– Since expanders use all available zones, there are no zones available to
allocate to any keypads on the bus. This applies even if some of the expanders have
unused zones.
Example b)
– A keypad takes up two zones at the top of the address range. The
remaining zones are available for keypads. However, since the control unit allocates
zones in groups of 10, the control unit will not allocate any of the remaining 8 zones in
that group to an expander.
Example c)
– An expander takes up zones at the top of the numbering range. The
control unit cannot allocate keypad zones to zone numbers below the expander.
