ABB REACT 2 Series Product Manual page 96

When connecting a single inverter to the monitoring system, activate the
communication line termination resistance by setting the RS485-LOGGER
line termination switch
Set a different RS485 address on each inverter of the chain. An address
can be chosen freely from out of 1 to 63.
The inverter address is set using the web server user interface (see the
When an RS-485 connection is being used, if one or more inverters
are added to the system at a later time, it is necessary to remember to
reset to OFF the switch on the termination resistance being used by the
inverter which previously was the last in the system.
Each inverter is supplied with one (1) preset RS485 address and with the
RS485-LOGGER line termination switch
Connect the signals respecting the following positions:
Terminal
name
RS485
LOGGER
For long distance connections, it is preferable to use a shielded twisted pair cable with characteristic
impedance of Z0=120 Ohm like the one shown in the following table:
+T/R
-T/R
RTN
+T/R
-T/R
RTN
Shield continuity must be provided along the communication line and must be grounded at a
single point using terminal 19 or 20 ( ).
37
(to the ON position).
Terminal
Description
number
13, 14 +T/R of the RS485 LOGGER communication line
15, 16 -T/R of the RS485 LOGGER communication line
Reference (RTN) of the RS485 LOGGER
17, 18
communication line
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5 - Installation
37 in the OFF position.
Signal Symbol
Positive data +T/R
Negative data -T/R
Reference RTN
Shield