UMG 509-PRO
40
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8.2
RS-485 interface
The RS-485 interface of this device is designed
as a 3-pole plug contact and communicates using
the Modbus RTU protocol.
The cables used must be suitable for an ambient
temperature of at least 80 °C.
Recommended cable type:
·Unitronic Li2YCY(TP) 2x2x0.22 (Lapp cable)
Fig. RS-485 connection example
A B
RS-485 bus
Data GND
WARNING
Risk of injury due to electrical voltage!
The Profibus, RS-485, temperature measurement
input and residual current measurement input are
not galvanically isolated from each other.
Consequently, it is essential to note that dan-
gerous voltages at these inputs can have an
effect on the other respective connections.
8.2.1
Termination resistors
At the beginning and end of a segment, the cable
is to be terminated with resistors (120 ohms,
1/4 W).
Termination within the device is possible via DIP
switch S1 of the device.
Right
Wrong
Terminal strip in the switchboard cab-
inet.
Device with RS-485 interface.
(Without termination resistor)
Device with RS-485 interface.
(With termination resistor on the de-
vice)
S1
ON
OFF
Fig. Termination activated via DIP switch (ON).
Содержание UMG 509-PRO
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