9751 Installation Guide 1. Introduction
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Elements of the IAS
An IAS comprises a control unit in a shielded case, with 1 to 4 separate
keypads and various detectors, transmitters and other devices connected to
programmable zones. If required, a keyswitch can be connected to a zone.
Each control unit has zone connectors on its printed circuit board (PCB).
Separate expanders enable more zones to be connected: each hardwired
expander adds up to 8 wired zones and each radio expander adds up to 8 or
16 wirefree zones (depending on the model used).
The control unit has 8 zones as standard, expandable to a maximum of 24.
Figure 1 shows how these elements are connected. In this example, the
control unit (14) is directly connected to 6 detectors and 2 door contacts.
Further zones are then connected to it through a hardwired expander (9) and
a radio expander (4). There are 4 keypads (7 and 11) on the bus.
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