37
UMG 509
S1
ON
OFF
Fig.: Placement in the middle
of the segment; termination via S1
DIP switch deactivated (OFF)
S1
ON
OFF
Fig.: Placement at the end of
the segment; termination via S1
DIP switch activated (ON)
Screening
Twisted screened cable should be used for connections
via the RS485 interface.
• Earth the screens of all cables that lead to the cabinet
and at the cabinet entry.
• Connect the screens over a generous area
and in a manner that will conduct well, to a low-noise
earth.
• Gather the cables mechanically above the earthing
clamp in order to avoid damage due to cable
movements.
• Use suitable cable glands to feed the cables into
the cabinet, for example, armoured conduit couplings.
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