105
verification, High&low bytes of checksum can be sent after exchanging.
Specific CRC verification can refer to the example associated with the
protocol. It is worth noting, the idle among frames should keep at least
3.5 bytes at the bus. The start and end idle among frames at the bus need
not to be accumulated
Through the function codes Drives can set different response delay to
suit the specific application needs of various master stations.In RTU
mode, the actual response delay is not less than 3.5 bytes intervals.
10.3
Protocol Function
Modbus main function is to read and write parameters. Different
function codes apply to different operation request. Inverter Modbus
protocol supports the following function codes
：
Function
Codes
Description
0x03
Read inverter function code parameter and operating condition
parameters
0x06
Modify single inverter function codes or control parameters , not
saved after power failure
0x10
Rewrite multiple function codes or control parameters , not saved
after power failure
0x41
Rewrite single drive or control parameters ,saved after power
failure
Parameters of the inverter (Function code, control parameters and
status parameters) are mapped to Modbus read & write register. Read &
write nature and scope of function code parameters comply with
specificatoins in the user manual. Group numbers of functions codes are
mapped to the high byte of register address.The group index is mapped
to the low byte of register address. Control parameters and status
parameters of the inverter are virtualized as inverter function code
groups. Correspondence relation between the register address high byte
and function codes group number is as follows
