Goodrive20-EU series VFD Communication protocol
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High bit of the start address
Low bit of the start address
T1-T2-T3-T4 between START and END is to provide at least the time of 3.5 bytes as the
leisure time and distinguish two messages for the avoidance of taking two messages as one
message.
ADDR = 01H means the command message is sent to the VFD with the address of 01H and
ADDR occupies one byte
CMD=03H means the command message is sent to read data from the VFD and CMD
occupies one byte
"Start address" means reading data from the address and it occupies 2 bytes with the fact
that the high bit is in the front and the low bit is in the behind.
"Data number" means the reading data number with the unit of word. If the "start address' is
0004H and the "data number" is 0002H, the data of 0004H and 0005H will be read.
CRC occupies 2 bytes with the high bit in the front and the low bit in the behind.
RTU slave response message (from the VFD to the master)
Data high bit of address
0004H
Data low bit of address 0004H
Data high bit of address
0005H
Data low bit of address 0005H
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