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4.2.2 RS-232 C
ONNECTIONS
The following section details how to set up an RS-232 connection between the Communicator and the
controllers.
Figure 4: Connecting the External Connection Box to Controllers via RS-232 Cards
1
Communicator External Box
2
Box communication ports
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
Controller communication card
The cable between the external connection box and the controllers should be a shielded cable
•
(22 AWG).
This cable is connected to all controllers and to the communication line of the external
•
connection box in the following manner:
o The COM wire is connected to the COM port in the communication terminal of the
controller (green wire).
o The Communicator External Box TX in the connection box is connected to RX in the
controller (red wire).
o The Communicator External Box RX in the connection box is connected to TX in the
controller (black wire).
o The shield should be connected to the earth (safety ground).
CAUTION Connect the shield (safety ground) only on one side!
Figure 4 key
© Munters AB, 2018
5
Shield cable
6
Other controllers
7
See Approximate Distances
and Baud Rate, page 17
15
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