104
10
Communication Protocal
10.1
Communication Mode
1
．
Inverter communication protocol is Modbus protocol, and supports
the common register read and write
。
2
．
Drive as a slave, master-slave point to point communication. A
Master drive uses broadcast address to send a command, the slave does
not answer.
3
．
In the case of long distance or multi-machine communication, we
recommend to connect the the master station signal GND with the drive
signal "GND", in order to improve the communication of immunity
10.2
Protocol Format
Modbus protocol supports RTU mode, the corresponding frame format
is as follows,
Srart,at least3.5
bytes idle time
Slave(drive
)address
Function
code
Data
cheksum
Modbus Data frame
RTU mode
End,at least3.5
bytes idle time
Modbus adopts "Big Endian" encoding,firstly transmitting high byte,
then low byte
。
RTU Mode
：
In RTU mode, idle time between frames will take the
higher one among Modbus internal conventional values and function
code setting values. The conventional Min idle frames inside Modbus is
as follows: The idle time passed the bus by the header and trailer is not
less than 3.5 byte time.
Data verification uses CRC-16. The entire information participates in
