Cooper Security i-on160EX Installation Guide download pdf (Page 20)

i-on160

Page 14

The System Bus

The system bus carries all the data between the control unit and its expanders

and keypads. Electrically the bus is a single set of four conductive paths. Two

paths carry dc power and two carry data. Physically the bus cable can connect

the devices in either daisy-chain or star arrangements – see Figure 2.

Figure 2. Bus Layout Example

See i-on160EX Installation Guide for details of bus configuration, maximum

bus length and cabling type. As part of programming the i-on160EX you will

need to understand how devices are addressed, and how to add and delete

them correctly.

Device Addressing on the Bus

Each device on the bus has a unique address. The device obtains this address

from the control unit, either during the commissioning stage of a new

installation, or at some later date under control of the Installer Menu when the

installer adds the device. Once the device has obtained a bus address, the

device stores that address in non-volatile memory.

During subsequent programming at the control unit the Installer also assigns

other information to each bus device, for example allocating them to partitions,

or programming the zone types and attributes of any zones attached to

expanders. The control unit stores this information within itself (NOT within the

bus device).

This means that if you need to remove a bus device, and perhaps install it on

another system then you must:

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Cooper Security i-on160EX Installation Guide Page 20

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