54 SUNFAR E300 SERIES
AppendixⅡ: MODBUS PROTOCOL
1. Communication Set
F4.0＝X1XX, choose MODBUS RTU protocol.
F4.0
＝X0XX, choose RS485 protocol.
Note: X means as random number.
2. Communication Function
It is for master and inverter communication, including sending inverter operation order,
modification function code parameter and read inverter running state, monitor parameter, failure
information and function code parameter.
3. Protocol Format
MODBUS RTU format
PDU
>3.5 character
transmission
interval
Slave addr.
Function
code Data
CRC
checkout
>3.5 character
transmission
interval
ADU
1.1 Protocol Format Explanation
1. Slave addr.
0 as broadcast addr., and slave addr. can be set as 1～30.
2. PDU part
（1）Function code 03:
Read several inverter function parameter, running state, monitor
parameter and failure information at most for reading six addr. serial inverter parameter.
Master send:
Register initial addr. Register number
PDU part 03
High order Low order High order Low order
Data length (Byte) 1 1 1 1 1
Slave correspond:
PDU part 03
Read byte number
（2* register number）
Read content
Data length (Byte) 1 1 2* register number
（2）Function code 06: Modify single inverter operation order, running freq and function
parameter.
E300 Series Mini-type Integrated Universal Inverter Manual
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