IMO SD1 Series - 7.5 Read;Write Operation Example

SD1 Series Inverters Communication Protocol
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7.5 Read/Write Operation Example
Refer to section 7.3 for the command format.
7.5.1 Example of reading command 03h
Example 1: Read the state word 1 of the inverter with the address of 01H (refer to the
parameter table of other functions). According to the parameter table, the parameter address
of the state word 1 of the inverter is 2100H.
RTU mode:
The command sent to the inverter:
Read
command
VFD
address
CRC check
Parameters
address
Data number
If the operation succeeds, the response message is as follows:
Read
command
Data
address
Data content
CRC check
VFD
address
ASCII mode:
The command sent to the inverter:
Read
command
VFD
address
LRC
check
Parameters
address
Data
number
If the operation succeeds, the response message is as follows:
Read
command
VFD
address
LRC
check
Data
content
Byte
number
The data content is 0003H. According to the parameter table of other functions, the inverter
stops.
7.5.2 Example of write command 06h
Example 1: Make the inverter with the address of 03H to run forward. According to the
parameter table of other functions, the address of "communication control command" is 2000H
and forward running is 0001. See the table below.
Function
instruction
Address
definition
Data meaning instruction
R/W
characteristics
Communication
control command
2000H
0001H: Forward running
R/W
0002H: Reverse running