11
Communication Hub Connections, examples
AH30 - RS485 Bus Connection
Examples of connection of multiple Communication Hubs
to a single RS-485 bus of an EAC system:
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
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
Note: The RS485 bus cable should be of type twisted pair. The
maximum cable length of 1000 meters should not be exceeded.
