janitza UMG511 Installation And Commissioning Manual page 35

Bus structure
All devices are connected in a bus structure
(line). In one segment, up to 32 participants
can be switched together. The cable is termi-
nated with resistors at the beginning and end
of a segment.
Repeaters (power boosters) must be used
with more than 32 participants in order to con-
nect the individual segments.
Installation
Terminal resistors
The cable is terminated with resistors (120Ohm
1/4W) at the beginning and end of a segment.
The UMG511 does not have any terminal re-
sistors.
Terminal strip in the switch cabinet.
Device with RS485 interface
(without terminal resistor)
Device with RS485 interface
(With terminal resistance on the device)
Correct
Wrong
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