INVT Goodrive3000 GD3000-01-055G-12 Operation Manual page 207

Goodrive3000 series medium voltage inverters
ADDR=01H means the command message is sent to the inverter with the address of 01H and ADDR
occupies one byte;
CMD=03H means the message is received from the inverter to the master for the response of reading
command and CMD occupies one byte;
"Byte number" means all byte number from the byte (excluding the byte) to CRC byte (excluding the byte).
04 means there are 4 byte of data from the "byte number" to "CRC low bit", which are "digital address
0004H high bit", "data low bit of address 0004H", "data high bit of address 0005H" and "data low bit of
address 0005H".
There are 2 bytes stored in one data with the fact that the high bit is in the front and the low bit is in the
behind of the message, the data of address 0004H is 1388H,and the data of address 0005H is 0000H.
CRC occupies 2 bytes with the fact that the low bit is in the front and the high bit is in the behind.
8.4.2 Command code: 06H, write one word
The command means that the master write data to the inverter and one command can write one data
other than multiple data. The effect is to change the working mode of the inverter.
For example, write 5000 (1388H) to 0004H from the inverter with the address of 02H, the frame structure
is as below:
RTU master command message (from the master to the inverter)
START
ADDR
CMD
High bit of writing data address
Low bit of writing data address
High bit of data content
Low bit of data content
CRC low bit
CRC high bit
END
RTU slave response message (from the inverter to the master)
START
ADDR
CMD
High bit of writing data address
Low bit of writing data address
High bit of data content
Low bit of data content
CRC low bit
CRC high bit
END
Note: 8.4.1 and 8.4.2 mainly describe the command format, and the detailed application will be
mentioned in 8.4.7 with examples.
8.4.3 Command code: 08H, diagnosis function
Meaning of sub-function codes:
Sub-function code
0000
For example: The inquiry information string is same as the response information string when the loop
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)
Description
Return to inquire information data
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MODBUS protocol
02H
06H
00H
04H
13H
88H
C5H
6EH
02H
06H
00H
04H
13H
88H
C5H
6EH