Goodrive270 series VFD for fan and pump Communication protocol
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"ADDR" is "01H", indicating that the message is sent by the VFD whose address is 01H. The ADDR
information occupies one byte.
"CMD" is "03H", indicating that the message is a VFD response to the 03H command from the master
for reading data. The CMD information occupies one byte.
"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.
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, 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)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
MSB of data writing address
LSB of data writing address
T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU slave response (from the VFD to the master)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
MSB of data writing address
LSB of data writing address
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