INVT Goodrive390L Series User Manual page 73

Goodrive390L Series Lift-Dedicated 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 "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.
7.1.2.2 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, if the master writes 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
ADDR
CMD
MSB of data writing address
LSB of data writing address
MSB of data content
LSB of data content
CRC LSB
CRC MSB
END
RTU slave response (from the VFD to the master)
START
ADDR
CMD
MSB of data writing address
LSB of data writing address
MSB of data content
LSB of data content
CRC LSB
CRC MSB
END
202403 (V1.0）
T1-T2-T3-T4 (transmission time of 3.5 bytes)
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Communication protocol
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