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.
Daisy chain connected communication hubs, set DIP 6 and 7 in ON position for one communication hub
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.
Star connected communication hubs, DIP 6 and 7 in ON position for one communication hub