Gree GUHD09NK3FO Service Manual page 44

Note:
In order to realize the MODBUS interface function, the address mode of the unit must be set into long-
distance control address mode; you can not set it into centralized control address mode, otherwise, this
function can not be realized;
The unit can not be connected to MODBUS and centralized controller at the same time; only one of them
can be selected;
255 sets of unit in maximum can be connected in the same network; the unit addresses in the same
network must be different, otherwise, the unit control will be affected;
Perform wiring when the unit power is cut off.
7.2.4 Connect to interface of centralized controller:
The indoor unit is with the interface of centralized controller. When centralized controller is connected,
centralized control of unit can be realized when the wired controller is not connected;
(1). Interface instruction:
1). The printing is COM-BMS2, COM-BMS3 and the interface type is B2B-XH-K3;
2). Electrical characteristic: none;
3). Working principle: centralized control the communication of indoor mainboard and realize the unit
control;
(2). Function instructions:
In order to achieve this function, set the address mode and address through wired controller. Please refer
to Point 3 for the setting method. The address mode is defaulted to be connecting to centralized controller
mode and the defaulted address is 1;
When the centralized controller is connected, centralized control of the unit can be realized to control unit
ON/OFF, operation mode, set fan speed/temperature and weekly timer.
(3). Setting method:
Firstly, set the address mode of wired controller into centralized controller address mode. The setting
method is:
Figure 2-7-11
U-Match Series DC
Inverter Service Manual
41