iDrive2 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.
RTU slave response message (from the inverter to the master)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Data high bit of address 0004H
Data low bit of address 0004H
Data high bit of address 0005H
Data low bit of address 0005H
T1-T2-T3-T4 (transmission time of 3.5 bytes)
The meaning of the response is:
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 receiced 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 CHK low bit”, which are “digital address 0004H
high bit”, “digital address 0004H low bit”, “digital address 0005H high bit” and “digital address 0005H low bit”.
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 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), 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)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
High bit of writing data address
Low bit of writing data address
T1-T2-T3-T4 (transmission time of 3.5 bytes)
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