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4.4 Function Selection Setting
When changing the function, please read the function select bit once, each indoor unit has 20 communication address
function selection bytes, explain with the first indoor unit communication protocol, firstly read 20 addresses of 40048 address
as follows:
Modbus RTU:
32 03 9C 70 00 14 6F 8D
Modbus TCP:
00 01 00 00 00 06 FF 03 9C 70 00 14
According to all the function selection read, directly use continuous write command (0x10) to write if want to change any
function selection, for those function selections which you do not want to change please use the function selection data read
above as new write value.
Taking the Mapping Table communication address of the first indoor unit as example, please refer to the Mapping Table
communication address of the first indoor unit, refer to the Mapping Table for others, operation of making function selection B2
= 1 is as follows:
Modbus RTU:
32 10 9C 70 00 14 28 00 20 00 00 00 00 00 80 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 E6 2C
Modbus TCP:
00 01 00 00 00 2F FF 10 9C 70 00 14 28 00 20 00 00 00 00 00 80 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00
Note
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After sent one control command, need to wait for the correct response code returned by Modbus before
sending next control command. If do not take this as your control method, please set the internal between
two control command to be more than 500ms.
●
When setting function selection, must:
Option 4 set bit7 = 1
Option 8 set bit7 = 1
Option 9 set bit7 = 0
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Please refer to the function selection analysis of Mapping Table for details, each function selection needs to
set the data in the designated range of the Mapping Table, please do not set illegal data for the function
selection.
4 Air Conditioner Monitoring