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Mounting and Connection Instructions IB2 Bus Expander
5.3
Guidelines RS-485 and IB2 bus
5.3.1
Bus End of line resistors
With jumpers JP1 to JP4 the EOL resistors of the
jumper JP5 the EOL resistor of the
Basically note
: The bus line must be terminated at
first user
RS-485 / IB2
A
B
- The user is at the
beginning or end
—>
Activate
EOL resistor
- The user is
between the beginning or end
the line:
—>
Deactivate
EOL resistor
Procedure:
Activate EOL resistor:
Set both jumpers
Deactivate EOL resistor:
Remove both jumpers
Attention!
Important for BUS-2 interfaces
On BUS-2 interfaces the EOL resistors must be
deactivated.
Remove jumpers if required (JP1 – JP4).
5.3.2
Cable lengths
Control
panel
R120
A
B
(EOL)
IB2 BUS
interface is activated/deactivated.
RS-485 / IB2
user
max. 2000 m
of the line:
RS-485 / IB2
User
A
B
max. 5 m
max. 2000 m
4 RS-485
interfaces are activated/deactivated, with
both ends with 120 Ohm
user
IB2 BUS
from panel
of
JP1–4
JP1–4
Out1
RS-485 / IB2
RS-485 / IB2
User
RS-485 / IB2
User
max. 5 m
.
RS-485 / IB2
user
JP5
IB2 BUS
Out1 Out2 Out3 Out4
JP1 JP2 JP3 JP4
Out2
Out3
4x BUS-2 / RS-485
User
RS-485 / IB2
A
17
last user
Out4
User
R120
B
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