i-on Range
The System Bus
Page 25
This has the following implications:
Carrying out a bus scan does not change the bus configuration. Note that
on large systems a bus scan may take some minutes.
If you are confident that the control unit has already learned all the devices
on the bus you do not have to carry out a bus scan (but it may be a useful
check).
If you have temporarily removed a bus device you can reconnect it to the
bus, provided that you carry out a bus scan and do not change its bus
address.
If, as a result of a bus scan, the control unit offers to re-configure the bus
(and you accept) then new devices will be added to the system only if they
already have a bus address. Missing devices will be removed from the
system (along with all details of the partitions they belong to, and any zone
information).
Note: Exercise great care when deciding whether to accept the control unit’s
offer to re-configure the bus. Once the control unit has deleted device
information you will need to re-address and re-program those devices and
zones if you want to add them to the bus again.
A bus re-configure is not saved until you leave Installer Menu. If the control
unit loses power before leaving Installer Menu then the bus re-configure
does not take effect.
Zone Numbering
When reporting alarms to an ARC using CID or SIA protocols the control unit
reports each detector as a zone number. The i-on160EX numbers zones in a
continuous range from 000 to 159, the i-on30EX zone numbers run from 000
to 029, and the i-on50EX zone numbers run from 000 to 049. The zone
numbers are independent of the physical connection points for each detector.
The process of assigning zone numbers to detector connection points is called
―mapping‖.
Mapping Zones to Device Connections
The control unit assigns blocks of zone numbers to each bus device
sequentially.
1. The connection points on the control unit PCB take zone numbers 000 to
009 (for FSL wiring) or 001 to 005 (for CC wiring).
2. Each bus device takes a sequential block of zone numbers, running on from
the previous bus device.
Figure 7 shows the zone numbers used by the example system in Figure 5.
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