System Communication - Gree GMV-144WM/B-U Owner's Manual

4.6 System Communication

4.6.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
(6) Communication between different refrigeration systems.
(7) Graphics of general communication connection.
4.6.2 Communication mode of GMV DC Inverter Units
CAN bus mode is taken for communication between IDU and ODU and communication
among IDUs.
Fig.4.6.1
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GMV DC Inverter VRF