Gree GUHD09NK3FO Service Manual page 42

Note:
When door control function and human sensitive function have been set at the same time, it is defaulted
that door control function is valid and human sensitive function is invalid.
The user can purchase the human sensitive module by himself. Please pay attention to the following
Notes:
There is the needle stand interface on the mainboard. The interface model inserted into this needle stand
must be PH-3P-K;
The current consumption of module can not exceed the current capacity provided by this interface.
7.2.3 MODBUS interface
The indoor unit of this series has MODBUS interface. If the user needs to connect the unit to the
management system of the building, please enquire Gree for the MODBUS protocol.
(1). Interface instruction:
1). The printing is COM-BMS1 and the interface type is B4B-XH-K3;
2). Electrical characteristic: baud rate: 9600bps; standard: RS485;
3). Working principle:
The indoor mainboard can send out the unit operation state through this interface and receive logical
Figure 2-7-8
Figure 2-7-9
U-Match Series DC
Inverter Service Manual
39