Wiring Topology; Termination - Munters CommBox Manual For Use And Maintenance

3.7.4 W T
IRING OPOLOGY
When connecting the CommBox to controllers via an RS-485 infrastructure, use one of the following
allowed topologies to ensure signal integrity.
Figure 10: Direct connections
Figure 11: T-Junction (permitted)
Figure 12: T-Junction (not permitted)
When using RS-232, there is no restriction on the distance between the T-Junction and the
NOTE:
controller.
3.7.5 T
ERMINATION
Termination, installing 120 ohm termination resistors at the beginning and end units of each chain of
CommBox and controllers, ensures reliable communication in RS-485 infrastructures. The following
illustrations show where to install the resistors. Depending on the topology, install the resistors in the T-box,
the terminal controller, or the Munters Repeater.
• Termination Topologies
• Termination Wiring
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