INVT IPE300 Series, Opeartion Manual

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IPE300 series engineering VFD Communication protocol
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included). The value "04" indicates that there are four bytes of data between "Number of bytes" and
"CRC LSB", that is, "MSB of data in 0004H", "LSB of data in 0004H", "MSB of data in 0005H", and
"LSB of data in 0005H".
A piece of data contains two bytes, with the MSB on the left and LSB on the right. From the response,
the data in 0004H is 1388H, and that in 0005H is 0000H.
CRC check occupies two bytes, with the LSB on the left, and MSB on the right.
9.4.2 Command code 06H, writing a word
This command is used by the master to write data to the VFD. One command can be used to write
only one piece of data. It is used to modify the parameters and running mode of the VFD.
For example, to write 5000 (1388H) to 0004H of the VFD whose address is 02H, the frame structure
is as follows.
RTU master command (from the master to the VFD)
START T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
ADDR 02H
CMD 06H
MSB of data writing address 00H
LSB of data writing address 04H
MSB of to-be-written data 13H
LSB of to-be-written data 88H
CRC LSB C5H
CRC MSB 6EH
END T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
RTU slave response (from the VFD to the master)
START T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
ADDR 02H
CMD 06H
MSB of data writing address 00H
LSB of data writing address 04H
MSB of to-be-written data 13H
LSB of to-be-written data 88H
CRC LSB C5H
CRC MSB 6EH
END T1-T2-T3-T4 (time gap with a min. length of 3.5 bytes)
Note: The sections 9.4.1 and 9.4.2 mainly describe the command formats. For the detailed
application, see the examples in section 9.4.8.