Aperio
®
Online Mechanical Installation Guide, Document No: ST-001323-B Date: 21 februari 2014
Aperio
®
Online
26
DIP 6-8 – RS-485 bus settings
DIP switch 6 and 7 activate pull up and pull
down-resistors, which must be enabled once
per bus. Either in the EAC system (see the EAC
documentation for the EAC in use, for use of
pull up or pull down on the EAC side), or on one
communication hub on the RS-485-bus.
DIP 8 is used to terminate the bus, which is
activated for communication hubs connected in
end position on the bus.
If there is more than one communication hub
to connect they should be connected in a daisy
chain. In this case, set DIP switches 6-8 in OFF
position for all communication hubs, except for
the communication hub at the end of the bus
which must have DIP switch 8 in ON position. The
RS-485 bus must be terminated on the EAC side.
EAC system
A
B
A
Termination
enabled
B
A
B
A
B
Hub 1
DIP 6 OFF
DIP 7 OFF
DIP 8 OFF
Hub 2
DIP 6 OFF
DIP 7 OFF
DIP 8 OFF
Hub N
End of Bus
DIP 6 ON
DIP 7 ON
DIP 8 ON
For a star connection, set DIP 6 and 7 in ON
position for one communication hub. DIP 8 must
be in ON position for all communication hubs.
The RS-485 bus can not be terminated on the EAC
side.
EAC system
A
B
A
Termination
enabled
B
A
B
Hub 2
DIP 6 OFF
DIP 7 OFF
DIP 8 ON
Hub 1
DIP 6 ON
DIP 7 ON
DIP 8 ON
Figure 8.
Daisy chain
connected communi-
cation hubs, set DIP 6
and 7 in ON position
for one communica-
tion hub
Figure 9.
Star con-
nected communica-
tion hubs, DIP 6 and 7
in ON position for one
communication hub
