Command Code 06H, Writing A Word; Command Code 08H, Diagnosis - INVT Goodrive350 Series Operation Manual

Goodrive350 series high-performance multifunction VFD
"Number of bytes" indicates the number of bytes between a byte (not included) and the CRC byte (not
included). The value 04 indicates that there are four bytes of data between "Number of bytes" and
"LSB of CRC", 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 is two bytes, with the MSB on the left and LSB on the right. From the response, we
can see that 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 operation mode of the VFD.
For example, to write 5000 (1388H) to 0004H of the VFD whose address is 02H, the structure of the
frame is described in the following table.
RTU master command (transmitted by the master to the VFD)
MSB of data writing address
LSB of data writing address
MSB of to-be-written data
LSB of to-be-written data
LSB of CRC
MSB of CRC
RTU slave response (transmitted by the VFD to the master)
MSB of data writing address
LSB of data writing address
MSB of to-be-written data
LSB of to-be-written data
LSB of CRC
MSB of CRC
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 Read/Write operation example.

9.4.3 Command code 08H, diagnosis

Sub-function code description:
START
ADDR
CMD
END
START
ADDR
CMD
END
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
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Communication
02H
06H
00H
04H
13H
88H
C5H
6EH
02H
06H
00H
04H
13H
88H
C5H
6EH