29 Communicator | 3.05
6.2.1 Setting up the RS-232 Connection
Figure 4: Connecting the External Connection Box to Controllers via RS-232 Cards
• The cable between the external connection box and the controllers should be a 3 Wire
Shielded Cable (22 AWG minimum).
• This cable is daisy-chained to all controllers and to the communication line of the external
connection box in the following manner:
• The COM wire is connected to the COM port in the communication terminal of the controller.
• The red wire, TX in the connection box, is connected to RX in the Controller.
• The black wire, RX in the connection box, is connected to TX in the Controller.
• The shield should be connected to the earth (safety ground).
1: Controller communicator card
2: Next house
3: Connect one end of the cable's shield only. Each controller
should be chain connected to the same wire, resulting in a long
ground cable without ground loop.
4: Communicator External Box
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