Cooper Security i-on 16 Guia do Utilizador descarregar pdf (Página 13)

i-on30EX

Page 9

Cable Configuration and Length

You can connect up to 10 devices to the

control unit bus. You may connect the

devices either in daisy chain (serially), or in

star (parallel) configuration at the control

unit connector.

Figure 10 Bus Wiring Configurations

For star configurations the cable length

from control unit to the most distant bus

device should be kept short, and should not

exceed 100m. There should be no more

than four arms in the star.

For a daisy chain configuration the total

cable length should not exceed 1,000m.

Bus Termination

The i-on30EX bus uses the RS485 interface.

Because of this the ends of the line in some

configurations may be terminated to

improve performance in electrically noisy

environments or where there are long cable

runs. The control unit. expanders and

keypads have a termination link on their

PCBs (see 16 in Fig 2 for the control unit, 5

in Fig 7 for the keypad, 12 in Fig 8 for the

wired expander and 11 in Fig 9 for the radio

expander). Fitting a jumper to the pins

adds a termination to the cable.

In a daisy chain configuration fit the

termination jumpers in the devices at each

end of the chain (see Fig 10 ).

In a star configuration:

If there are only two arms on the star

then this is the same as a daisy chain

configuration (see “Daisy Chain 1” in

Figure 10). If required fit the

termination jumper at the devices on

the end of each arm.

If there are more than two arms AND

two cables are long while the remaining

cables are short (less than 10m) then it

is possible to terminate at the two

devices on the ends of the long cables.

If there are more than two arms BUT

each cable is more than 10m then DO

NOT fit the termination jumpers on any

of the devices.

Voltage Drop

In order for the system to work correctly,

the voltage at each device must NOT drop

below 10.5V even when running on the

standby battery. Cooper Security

recommend that the voltage at each device

should stay above 12V.

Standard 7/0.2 alarm cable has a

resistance of 8 Ohms per 100m per core.

The voltage drop is calculated using the

following formula: V Drop = Current drawn

x cable length x 0.08 x 2.

Table 1 shows the voltage drop against the

current drawn and cable length.

The shaded area shows where the voltage

drop would cause the bus voltage to fall

from 13.8V to below 12.0V when using a

single core.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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