Midea MIH15GN18 Manual De Usuario E Instalacion página 58

5. D1D2 communication line connection (limited to ODU and system configuration)
A
Achieving one-to-multiple and two-to-multiple functions of the IDU wired controller through D1D2 communication
(a maximum of 16 sets)
D1D2 communication is 485 communication. The one-to-more and two-to-more functions of the IDU wired controller
can be achieved through D1D2 communication, as shown in the figure below:
IDU 1#
X1 X2
L1
X1 X2
Wired controller
L1+L2 ≤ 200m, L3+Ln ≤ 1200m
[ Caution ]
When the IDUs in the same refrigerant system are V8 IDUs, D1D2 communication can enable one-to-multiple and
two-to-multiple functions of the IDU wired controller.
To enable two-to-multiple functions, wired controllers must be of the same model.
B
Achieving centralized control of the IDU through D1D2 communication
The D1D2 communication line can also be connected to the centralized controller to achieve centralized control of
the IDU, as shown in the figure below:
IDU 1#
CN2
L1+L3+Ln ≤ 1200m
IDU 2#
D1 D2
CN2
CN6
L3
L2
Please use shielded wires, and the
shield layer cannot be grounded.
The IDU can realize the one-to-more and two-to-more functions.
X1 X2
(master-slave wired controller needs to be set)
Wired controller
IDU 2#
D1 D2 D1 D2
CN2
L3
L1
X Y
Centralized
controller
D1 D2
···
IDU 3-15#
CN2
Ln
Use shielded cables and
ground the shield layer.
···
3-(n-1)# IDU
Ln
Use shielded cables and
ground the shield layer.
53
Installation
IDU 16#
D1 D2
CN2
IDU n#
D1 D2
CN2