34 Installation
Anti-intrusion control panels
3-2
Connecting peripherals
3-2-1
The I-BUS line wiring
The peripheral devices of the Prime system must be connected to the control panel via the I-
BUS.
The connection between the control panel and its peripherals is achieved through a 4 wire (or
more) cable.
ATTENTION!
The shield must be connected to one of the terminals (Negative or GND) at the control
panel end only, and must run along the BUS without being connected to negative or GND at
any other point.
The control panel connection is done using terminals “+ D S -” on the motherboard (Table 2-
7: Mother board - terminal board, 7-8-9-10).
DIMENSIONING
(SIZING)
The dimensioning (sizing) of the I-BUS line, that is, the distribution of the peripheral devices
and length/sizing of the cables/wiring used for their connections must be done in accordance
with the various factors of the layout, in order to guarantee the diffusion of the signals of
conductors “D” and “S” and the power supplied by conductors “+” and “-”.
The factors are:
• The current consumption of the connected devices.
In the case of insufficient power supply from the BUS line to peripherals and detectors, this
can also be supplied by external power supplies.
•Cable type
The cable section used affects the dispersion of the conductor signals.
Communication speed over the BUS
This parameter can be changed by means of the Prime/Studio software (38.4, 125 or
250kbs).
• Number and distribution of IB200 isolators.
To increase the reliability and the extension of the BUS it is necessary to use isolators.
For a correct installation of the isolator and of the BUS, it is necessary to size the BUS line in
which the isolator is located on the basis of the number of peripherals connected and their
total current absorption. This absorption is to be compared with the “Maximum absorption
from the control panel” feature.
Another feature of the isolators, which affects their dimensions (sizing) is the length of the
line downstream of the isolator, to the next isolator or to the end of the line. Following is a
table with indicative values of the length depending on the BUS speed:
Table 3-1: Recommended cable
Cable
AF CEI 20-22 II
n. wires
Section (mm
2
)
I-BUS terminal
4 wire cable + shield
20.5+ -
20.22D S
6 wire cable + shield
20.5+ -
20.22D S
2 0.22 available
6 wire cable + shield
20.75+ -
20.22D S
2 0.22 available
Table 3-2: Dimensioning (sizing) of the BUS
BUS speed Maximum BUS cable length
38.4kbps 1000m
125kbps 700m
250kbps 300m
Table 3-3: Dimensioning (sizing) of IB200 isolators
BUS speed
Cable length down-
stream of the isolator (L)
Maximum number of cas-
caded isolators
38.4kbps 500m 9
125kbps 350m 6
250kbps 200m 2
+ D S -
Shield
Control panel
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