ABB UNO-DM-2.0-TL-PLUS Manual page 82

The RS485 HALF-DUPLEX communication line is made up of two trans-
mission and reception cables (+T/R and –T/R) and a communication ref-
erence cable (RTN): all three cables must be connected in daisy-chain
configuration (it's recommended to make connection external to the in-
22
verter).
The RS485 connection can be made by using the terminal block
The last inverter of a daisy chain shall be terminated: within the last in-
verter itself the provided jumper at the pins marked "120Ohm TERM."
shall be placed in ON position in order to enable the termination the
RS485 communication line
If the RS485 communication line is used to connect an energy meter it will not be possible to
connect other unit with daisy-chain.
After the connection is completed RS485 inverter address have to be
chosen between 1 and 63.
The setting of the address on the inverter is done through the relevant
section of web user interface (see the specific chapter) or through the
display and the keyboard (see the specific chapter).
Each inverter is supplied with the preset RS485 address "2" and with the
jumper termination resistance
K1
with a resistance present onboard.
22
06
J3 J2
ON
OFF
1
ALARM REM
MP1
in the OFF position.
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5 - Installation
.
26
J4
RS485