Gree GMV5 Series Manual page 146

11.3.2 Communication connection mode between the indoor unit and wired controller
The indoor unit and the wired controller are connected in one of the following four modes, which are
respectively shown in Figure below:
One wire controller controls one indoor unit
When two wired controllers control multiple indoor units at the same time, the wired controller can be
connected to any indoor unit, the connected indoor units must belong to the same series, and only one
wired controller must be set to a slave wired controller. The number of indoor units controlled by the
wired controllers is not more than 16, and the connected indoor units must be on the same indoor unit
network.
144
D1 D2
IDU
D1 D2
IDU1
One wire controller controls multiple indoor units
D1 D2
IDU1
Two wire controllers control multiple indoor units
D1 D2
IDU
Two wire controllers control one indoor unit
IDU2
IDU2
IDU16
IDU16