Aperio
®
Online Mechanical Installation Guide, Document No: ST-001323-B Date: 21 februari 2014
39
Aperio
®
Online
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 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 the communication hub 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 switches 6-8 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 17.
Daisy chain
connected communi-
cation hubs, set DIP 6
and 7 in ON position
for one communica-
tion hub
Figure 18.
Star con-
nected communica-
tion hubs, DIP 6 and 7
in ON position for one
communication hub
