2.5 Master – slave connectivity
The controller can be connected in master-slave systems via the
RS485 communication terminal (2 x twisted pair cable) as master
or slave. Controllers must be wired according to the figure to the
right. Polarity A and B or + or – on controllers must be respected.
Master controllers must be set up to broadcast data in local
communication.
Up to 20 ECL Comfort 120 controllers can be connected in a local
ECL network.
Settings and addressing must be done via mobile phones app.
Operating mode is selectable between Modbus RTU or ECL 485
and can be selected for terminals 34 – B (D+), 35 -A (D -) and GND.
When connecting multiple controllers in serial connection max.
cable length is 1200 m and termination should be respected. In
ECL 485 mode the cable length should be less than 100 m in total.
Local ECL 485 bus is not compatible with ECL Comfort 210/296/310
controllers.
Master-slave picture
10 | © Danfoss | 2022.12
AQ428842090782en-010102
Operating Guide ECL Comfort 120 controller and app
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