Munters CommBox Manual For Use And Maintenance page 12

Figure 4: RS-485 Wiring
© Munters AB, 2020
1. The cable between the
external connection box and
the controllers should be a 3
wire twisted shielded cable
(22 or 24 AWG).
2. Connect the wiring as
follows:
• COM to COM
• The CommBox A port
is connected to
Controller's A port.
• The CommBox B port
is connected to
Controller's B port.
3. The final controller in any
chain or branch requires a
120 ohm terminator. Refer to
Termination, page 16.
4. Connect the cable shield
wire to the controller ground
strip.
12