INVT GD20-0R4G-2-UL, Operation Manual

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Goodrive20-UL Series VFD Communication protocol
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is in the behind of the message, the data of data address 0004H is 1388H, and the data of
data address 0005H is 0000H.
CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the
behind.
7.3.2 Command code 06H
06H (correspond to binary 0000 0110), writing a word
The command means that the master write data to the VFD and one command can write one
data other than multiple dates. The effect is to change the working mode of the VFD.
For example, write 5000 (1388H) to 0004H from the VFD with the address of 02H, the frame
structure is as below:
RTU master command message (from the master to the VFD)
START T1-T2-T3-T4
ADDR 02H
CMD 06H
High bit of writing data
address
00H
Low bit of writing data
address
04H
High bit of data
content
13H
Low bit of data
content
88H
CRC CHK low bit C5H
CRC CHK high bit 6EH
END T1-T2-T3-T4
RTU slave response message (from the VFD to the master)
START T1-T2-T3-T4
ADDR 02H
CMD 06H
High bit of writing data
address
00H
Low bit of writing data
address
04H
High bit of data
content
13H