ABB REACT-3.6-TL Product Manual page 98

21
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:
Shield continuity must be provided along the communication line and must be grounded at a
single point using terminal 19 or 20 ( ).
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Connect the signals respecting the following positions:
Terminal Terminal
Description
name number
14 -T/R RS485 METER communication line
RS485 16 +T/R RS485 METER communication line
METER Reference (RTN) of the RS485 METER
18
communication line
SH
+T/R
-T/R
RTN
SH
+T/R
-T/R
RTN
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5 - Installation
Signal Symbol
Positive data +T/R
Negative data -T/R
Reference RTN
Shield
SH ( )