31 Communicator | 3.05
Figure 5: Connecting the External Connection box to Controllers via RS-485 Cards
• The cable between the external connection box and the controllers should be a 2-wire
shielded cable.
• This cable is daisy-chained to all controllers and to exrternal connection box:
o Connect the shield to the COM terminal of the controller on one side and leave
unconnected on the other side.
o Red wire to terminal A of the controller and terminal A of the external connection box.
o Green wire to terminal B of the controller and terminal B of the external connection
box.
1: Controller communicator card
2: Next house
3: To prevent ground loops, connect the shield
wire at one end only
4: Communicator External Box
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