Astraada DRV-24 frequency inverters Communication protocol
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CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the behind.
7.3.1.2 Command code:06H
06H(correspond to binary 0000 0110), write one word(Word)
The command means that the master write data to the inverter and one command can write one
data other than multiple dates. 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)
High bit of writing data
address
Low bit of writing data
address
RTU slave response message (from the inverter to the master)
High bit of writing data
address
Low bit of writing data
address
Note: section 10.2 and 10.3 mainly describe the command format, and the detailed application will
be mentioned in 10.8 with examples.
7.3.1.3 Command code 08H for diagnosis
Meaning of sub-function codes
Return to inquire information data
For example: The inquiry information string is same as the response information string when the
loop detection to address 01H of driver is carried out.
The RTU request command is:
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